diff --git a/.gitignore b/.gitignore
index 285309dd..73386e80 100644
--- a/.gitignore
+++ b/.gitignore
@@ -303,3 +303,6 @@ backlog/*
 
 # Local Claude config files
 .claude/*modelling_cohort.csv
+
+# Local EPC debug cache (scripts/eon)
+scripts/eon/epc_cache.pkl
diff --git a/backend/epc_api/json_samples/RdSAP-Schema-20.0.0/corpus.jsonl b/backend/epc_api/json_samples/RdSAP-Schema-20.0.0/corpus.jsonl
new file mode 100644
index 00000000..fa973d44
--- /dev/null
+++ b/backend/epc_api/json_samples/RdSAP-Schema-20.0.0/corpus.jsonl
@@ -0,0 +1,1000 @@
+{"uprn": 100021180944, "roofs": [{"description": {"value": "Pitched, 200 mm loft insulation", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "walls": [{"description": {"value": "Cavity wall, as built, no insulation (assumed)", "language": "1"}, "energy_efficiency_rating": 2, "environmental_efficiency_rating": 2}], "floors": [{"description": {"value": "Solid, no insulation (assumed)", "language": "1"}, "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}], "status": "entered", "tenure": 3, "window": {"description": {"value": "Fully double glazed", "language": "1"}, "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}, "addendum": {"cavity_fill_recommended": "true"}, "lighting": {"description": {"value": "Low energy lighting in all fixed outlets", "language": "1"}, "energy_efficiency_rating": 5, "environmental_efficiency_rating": 5}, "postcode": "N15 6QH", "hot_water": {"description": {"value": "From main system", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "LONDON", "built_form": 4, "created_at": "2022-06-13 10:03:51.836297", "door_count": 1, "glazed_area": 1, "glazing_gap": "16+", "region_code": 17, "report_type": 2, "sap_heating": {"cylinder_size": 1, "water_heating_code": 901, "water_heating_fuel": 26, "instantaneous_wwhrs": {"rooms_with_bath_and_or_shower": 1, "rooms_with_mixer_shower_no_bath": 0, "rooms_with_bath_and_mixer_shower": 1}, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2107, "main_heating_category": 2, "main_heating_fraction": 1, "mcs_installed_heat_pump": "false", "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 17815}], "immersion_heating_type": "NA", "has_fixed_air_conditioning": "false"}, "sap_version": 9.94, "schema_type": "RdSAP-Schema-20.0.0", "uprn_source": "Energy Assessor", "country_code": "EAW", "main_heating": [{"description": {"value": "Boiler and radiators, mains gas", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "dwelling_type": {"value": "Mid-terrace house", "language": "1"}, "language_code": 1, "property_type": 0, "address_line_1": "6 Franklin Street", "assessment_type": "RdSAP", "completion_date": "2022-06-13", "inspection_date": "2022-06-09", "extensions_count": 1, "measurement_type": 1, "total_floor_area": 88, "transaction_type": 8, "conservatory_type": 1, "heated_room_count": 5, "pvc_window_frames": "true", "registration_date": "2022-06-13", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "photovoltaic_supply": {"none_or_no_details": {"pv_connection": 0, "percent_roof_area": 0}}, "wind_turbines_count": 0, "wind_turbines_terrain_type": 2}, "secondary_heating": {"description": {"value": "None", "language": "1"}, "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 280, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 4, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.4, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 42.6, "quantity": "square metres"}, "party_wall_length": {"value": 14.2, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 9.2, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.4, "quantity": "metres"}, "total_floor_area": {"value": 42.6, "quantity": "square metres"}, "party_wall_length": {"value": 14.2, "quantity": "metres"}, "heat_loss_perimeter": {"value": 12, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "E", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "200mm", "wall_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.4, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 2.38, "quantity": "square metres"}, "party_wall_length": 0.85, "floor_construction": 1, "heat_loss_perimeter": {"value": 3.65, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "E", "party_wall_construction": 0, "wall_thickness_measured": "N", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}], "low_energy_lighting": 100, "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 467, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 2.8, "energy_rating_average": 60, "energy_rating_current": 71, "lighting_cost_current": {"value": 71, "currency": "GBP"}, "main_heating_controls": [{"description": {"value": "Programmer, TRVs and bypass", "language": "1"}, "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}], "multiple_glazing_type": 3, "open_fireplaces_count": 0, "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 385, "currency": "GBP"}, "hot_water_cost_current": {"value": 95, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 60, "currency": "GBP"}, "indicative_cost": "\u00a3500 - \u00a31,500", "improvement_type": "B", "improvement_details": {"improvement_number": 6}, "improvement_category": 5, "energy_performance_rating": 74, "environmental_impact_rating": 72}, {"sequence": 2, "typical_saving": {"value": 22, "currency": "GBP"}, "indicative_cost": "\u00a3350 - \u00a3450", "improvement_type": "G", "improvement_details": {"improvement_number": 14}, "improvement_category": 5, "energy_performance_rating": 75, "environmental_impact_rating": 73}, {"sequence": 3, "typical_saving": {"value": 29, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a36,000", "improvement_type": "N", "improvement_details": {"improvement_number": 19}, "improvement_category": 5, "energy_performance_rating": 76, "environmental_impact_rating": 75}, {"sequence": 4, "typical_saving": {"value": 345, "currency": "GBP"}, "indicative_cost": "\u00a33,500 - \u00a35,500", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 86, "environmental_impact_rating": 84}], "co2_emissions_potential": 1.2, "energy_rating_potential": 86, "lighting_cost_potential": {"value": 71, "currency": "GBP"}, "schema_version_original": "LIG-19.0", "alternative_improvements": [{"improvement": {"sequence": 1, "typical_saving": {"value": 31, "currency": "GBP"}, "improvement_type": "Q2", "improvement_details": {"improvement_number": 55}, "improvement_category": 6, "energy_performance_rating": 75, "environmental_impact_rating": 74}}], "hot_water_cost_potential": {"value": 67, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2170, "impact_of_cavity_insulation": -1362, "space_heating_existing_dwelling": 7604}, "energy_consumption_current": 180, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "v94.0.1.1", "energy_consumption_potential": 75, "environmental_impact_current": 68, "fixed_lighting_outlets_count": 8, "current_energy_efficiency_band": "C", "environmental_impact_potential": 84, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "B", "co2_emissions_current_per_floor_area": 32, "low_energy_fixed_lighting_outlets_count": 8}
+{"uprn": 10014291060, "roofs": [{"description": {"value": "Flat, insulated (assumed)", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "walls": [{"description": {"value": "Cavity wall, as built, insulated (assumed)", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "floors": [{"description": {"value": "(another dwelling below)", "language": "1"}, "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}], "status": "entered", "tenure": 2, "window": {"description": {"value": "Fully double glazed", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "lighting": {"description": {"value": "Low energy lighting in all fixed outlets", "language": "1"}, "energy_efficiency_rating": 5, "environmental_efficiency_rating": 5}, "postcode": "RM15 5FD", "hot_water": {"description": {"value": "From main system", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "SOUTH OCKENDON", "built_form": 4, "created_at": "2022-03-11 08:50:33.539906", "door_count": 1, "glazed_area": 1, "region_code": 2, "report_type": 2, "sap_heating": {"cylinder_size": 3, "water_heating_code": 901, "water_heating_fuel": 26, "cylinder_thermostat": "Y", "instantaneous_wwhrs": {"rooms_with_bath_and_or_shower": 1, "rooms_with_mixer_shower_no_bath": 0, "rooms_with_bath_and_mixer_shower": 0}, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2106, "main_heating_category": 2, "main_heating_fraction": 1, "sap_main_heating_code": 104, "mcs_installed_heat_pump": "false", "central_heating_pump_age": 0, "main_heating_data_source": 2}], "immersion_heating_type": "NA", "cylinder_insulation_type": 1, "has_fixed_air_conditioning": "false", "cylinder_insulation_thickness": 50}, "sap_version": 9.94, "schema_type": "RdSAP-Schema-20.0.0", "uprn_source": "Energy Assessor", "country_code": "EAW", "main_heating": [{"description": {"value": "Boiler and radiators, mains gas", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "dwelling_type": {"value": "Top-floor flat", "language": "1"}, "language_code": 1, "property_type": 2, "address_line_1": "44 Avontar Court", "address_line_2": "Avontar Road", "assessment_type": "RdSAP", "completion_date": "2022-03-11", "inspection_date": "2022-03-05", "extensions_count": 0, "measurement_type": 1, "sap_flat_details": {"level": 3, "top_storey": "Y", "flat_location": 2, "heat_loss_corridor": 2, "unheated_corridor_length": {"value": 1.41, "quantity": "metres"}}, "total_floor_area": 67, "transaction_type": 8, "conservatory_type": 1, "heated_room_count": 3, "pvc_window_frames": "true", "registration_date": "2022-03-11", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "photovoltaic_supply": {"none_or_no_details": {"pv_connection": 0, "percent_roof_area": 0}}, "wind_turbines_count": 0, "wind_turbines_terrain_type": 2}, "secondary_heating": {"description": {"value": "None", "language": "1"}, "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 350, "floor_heat_loss": 6, "roof_construction": 1, "wall_construction": 4, "building_part_number": 1, "sap_alternative_wall": {"wall_area": 3.356, "sheltered_wall": "Y", "wall_dry_lined": "N", "wall_thickness": 350, "wall_construction": 4, "wall_insulation_type": 4, "wall_thickness_measured": "Y", "wall_insulation_thickness": "NI"}, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.38, "quantity": "metres"}, "total_floor_area": {"value": 66.98, "quantity": "square metres"}, "party_wall_length": {"value": 23.01, "quantity": "metres"}, "heat_loss_perimeter": {"value": 10.11, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "K", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}], "low_energy_lighting": 100, "solar_water_heating": "N", "habitable_room_count": 3, "heating_cost_current": {"value": 195, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 1.4, "energy_rating_average": 60, "energy_rating_current": 80, "lighting_cost_current": {"value": 63, "currency": "GBP"}, "main_heating_controls": [{"description": {"value": "Programmer, room thermostat and TRVs", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "multiple_glazing_type": 2, "open_fireplaces_count": 0, "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 195, "currency": "GBP"}, "hot_water_cost_current": {"value": 129, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "co2_emissions_potential": 1.4, "energy_rating_potential": 80, "lighting_cost_potential": {"value": 63, "currency": "GBP"}, "schema_version_original": "LIG-19.0", "hot_water_cost_potential": {"value": 129, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2671, "space_heating_existing_dwelling": 1556}, "energy_consumption_current": 119, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "v94.0.1.1", "energy_consumption_potential": 119, "environmental_impact_current": 82, "fixed_lighting_outlets_count": 7, "current_energy_efficiency_band": "C", "environmental_impact_potential": 82, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 21, "low_energy_fixed_lighting_outlets_count": 7}
+{"uprn": 1775063025, "roofs": [{"description": {"value": "Pitched, 100 mm loft insulation", "language": "1"}, "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}, {"description": {"value": "Flat, insulated (assumed)", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "walls": [{"description": {"value": "Cavity wall, filled cavity", "language": "1"}, "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}, {"description": {"value": "Cavity wall, as built, insulated (assumed)", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "floors": [{"description": {"value": "Suspended, no insulation (assumed)", "language": "1"}, "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, {"description": {"value": "Solid, insulated (assumed)", "language": "1"}, "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}], "status": "entered", "tenure": 3, "window": {"description": {"value": "Fully double glazed", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "lighting": {"description": {"value": "Low energy lighting in all fixed outlets", "language": "1"}, "energy_efficiency_rating": 5, "environmental_efficiency_rating": 5}, "postcode": "PO3 6LL", "hot_water": {"description": {"value": "From main system", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "PORTSMOUTH", "built_form": 2, "created_at": "2022-03-04 16:11:12.261688", "door_count": 1, "glazed_area": 2, "region_code": 16, "report_type": 2, "sap_heating": {"cylinder_size": 1, "water_heating_code": 901, "water_heating_fuel": 26, "instantaneous_wwhrs": {"rooms_with_bath_and_or_shower": 2, "rooms_with_mixer_shower_no_bath": 0, "rooms_with_bath_and_mixer_shower": 1}, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2106, "main_heating_category": 2, "main_heating_fraction": 1, "mcs_installed_heat_pump": "false", "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 18221}], "immersion_heating_type": "NA", "has_fixed_air_conditioning": "false"}, "sap_version": 9.94, "schema_type": "RdSAP-Schema-20.0.0", "uprn_source": "Energy Assessor", "country_code": "EAW", "main_heating": [{"description": {"value": "Boiler and radiators, mains gas", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "dwelling_type": {"value": "Semi-detached house", "language": "1"}, "language_code": 1, "property_type": 0, "address_line_1": "5 Paignton Avenue", "assessment_type": "RdSAP", "completion_date": "2022-03-04", "inspection_date": "2022-03-04", "extensions_count": 1, "measurement_type": 1, "total_floor_area": 90, "transaction_type": 8, "conservatory_type": 1, "heated_room_count": 5, "pvc_window_frames": "true", "registration_date": "2022-03-04", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "photovoltaic_supply": {"none_or_no_details": {"pv_connection": 0, "percent_roof_area": 0}}, "wind_turbines_count": 0, "wind_turbines_terrain_type": 2}, "secondary_heating": {"description": {"value": "None", "language": "1"}, "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 280, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 4, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.55, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 36.76, "quantity": "square metres"}, "party_wall_length": {"value": 6.73, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 14.31, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.51, "quantity": "metres"}, "total_floor_area": {"value": 34.93, "quantity": "square metres"}, "party_wall_length": {"value": 6.73, "quantity": "metres"}, "heat_loss_perimeter": {"value": 17.11, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "C", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "100mm"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.55, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 18.48, "quantity": "square metres"}, "party_wall_length": 0, "floor_construction": 1, "heat_loss_perimeter": {"value": 13, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "K", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}], "low_energy_lighting": 100, "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 440, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 2.7, "energy_rating_average": 60, "energy_rating_current": 72, "lighting_cost_current": {"value": 72, "currency": "GBP"}, "main_heating_controls": [{"description": {"value": "Programmer, room thermostat and TRVs", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "multiple_glazing_type": 2, "open_fireplaces_count": 0, "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 408, "currency": "GBP"}, "hot_water_cost_current": {"value": 95, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 32, "currency": "GBP"}, "indicative_cost": "\u00a3800 - \u00a31,200", "improvement_type": "W1", "improvement_details": {"improvement_number": 57}, "improvement_category": 5, "energy_performance_rating": 73, "environmental_impact_rating": 71}, {"sequence": 2, "typical_saving": {"value": 30, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a36,000", "improvement_type": "N", "improvement_details": {"improvement_number": 19}, "improvement_category": 5, "energy_performance_rating": 75, "environmental_impact_rating": 73}, {"sequence": 3, "typical_saving": {"value": 385, "currency": "GBP"}, "indicative_cost": "\u00a33,500 - \u00a35,500", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 85, "environmental_impact_rating": 82}], "co2_emissions_potential": 1.2, "energy_rating_potential": 85, "lighting_cost_potential": {"value": 72, "currency": "GBP"}, "schema_version_original": "LIG-19.0", "hot_water_cost_potential": {"value": 66, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2187, "impact_of_loft_insulation": -334, "space_heating_existing_dwelling": 7600}, "energy_consumption_current": 167, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "v94.0.1.1", "energy_consumption_potential": 74, "environmental_impact_current": 69, "fixed_lighting_outlets_count": 12, "current_energy_efficiency_band": "C", "environmental_impact_potential": 82, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "B", "co2_emissions_current_per_floor_area": 29, "low_energy_fixed_lighting_outlets_count": 12}
+{"uprn": 10002100730, "roofs": [{"description": {"value": "Pitched, insulated (assumed)", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "walls": [{"description": {"value": "Timber frame, as built, insulated (assumed)", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "floors": [{"description": {"value": "Solid, limited insulation (assumed)", "language": "1"}, "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}], "status": "entered", "tenure": 2, "window": {"description": {"value": "Fully double glazed", "language": "1"}, "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}, "lighting": {"description": {"value": "Low energy lighting in 70% of fixed outlets", "language": "1"}, "energy_efficiency_rating": 5, "environmental_efficiency_rating": 5}, "postcode": "LN12 1GA", "hot_water": {"description": {"value": "From main system", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "MABLETHORPE", "built_form": 2, "created_at": "2022-04-22 17:00:36.367359", "door_count": 2, "glazed_area": 1, "glazing_gap": 12, "region_code": 3, "report_type": 2, "sap_heating": {"cylinder_size": 1, "water_heating_code": 901, "water_heating_fuel": 26, "instantaneous_wwhrs": {"rooms_with_bath_and_or_shower": 1, "rooms_with_mixer_shower_no_bath": 0, "rooms_with_bath_and_mixer_shower": 1}, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "N", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2107, "main_heating_category": 2, "main_heating_fraction": 1, "sap_main_heating_code": 104, "central_heating_pump_age": 0, "main_heating_data_source": 2}], "immersion_heating_type": "NA", "has_fixed_air_conditioning": "false"}, "sap_version": 9.94, "schema_type": "RdSAP-Schema-20.0.0", "uprn_source": "Energy Assessor", "country_code": 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{"floor": 1, "room_height": {"value": 2.644, "quantity": "metres"}, "total_floor_area": {"value": 46.087, "quantity": "square metres"}, "party_wall_length": {"value": 19.96, "quantity": "metres"}, "heat_loss_perimeter": {"value": 8.636, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": 2, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "300mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.35, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 9.35, "quantity": "square metres"}, "party_wall_length": {"value": 4.291, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 6.467, 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"has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 55, "low_energy_fixed_lighting_outlets_count": 7}
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"heat_loss_perimeter": {"value": 7.4, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "200mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension", "wall_dry_lined": "N", "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 3, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.53, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 11.93, "quantity": "square metres"}, "party_wall_length": {"value": 4.81, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 7.31, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": 0, "wall_thickness_measured": "N", "roof_insulation_location": 2, "roof_insulation_thickness": "270mm", 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"\u00a3850 - \u00a31,500", "improvement_type": "A2", "improvement_details": {"improvement_number": 45}, "improvement_category": 5, "energy_performance_rating": 78, "environmental_impact_rating": 68}, {"sequence": 2, "typical_saving": {"value": 49, "currency": "GBP"}, "indicative_cost": "\u00a3500 - \u00a31,500", "improvement_type": "B", "improvement_details": {"improvement_number": 6}, "improvement_category": 5, "energy_performance_rating": 80, "environmental_impact_rating": 70}, {"sequence": 3, "typical_saving": {"value": 203, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a314,000", "improvement_type": "Q", "improvement_details": {"improvement_number": 7}, "improvement_category": 5, "energy_performance_rating": 85, "environmental_impact_rating": 78}, {"sequence": 4, "typical_saving": {"value": 87, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a36,000", "improvement_type": "W2", "improvement_details": {"improvement_number": 58}, "improvement_category": 5, 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"mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 753, "currency": "GBP"}, "indicative_cost": "\u00a3100 - \u00a3350", "improvement_type": "A", "improvement_details": {"improvement_number": 5}, "improvement_category": 5, "energy_performance_rating": 52, "environmental_impact_rating": 32}, {"sequence": 2, "typical_saving": {"value": 448, "currency": "GBP"}, "indicative_cost": "\u00a31,500 - \u00a32,700", "improvement_type": "A3", "improvement_details": {"improvement_number": 46}, "improvement_category": 5, "energy_performance_rating": 57, "environmental_impact_rating": 36}, {"sequence": 3, "typical_saving": {"value": 751, "currency": "GBP"}, "indicative_cost": "\u00a3500 - \u00a31,500", "improvement_type": "B", "improvement_details": {"improvement_number": 6}, "improvement_category": 5, "energy_performance_rating": 65, "environmental_impact_rating": 45}, {"sequence": 4, "typical_saving": {"value": 111, "currency": "GBP"}, "indicative_cost": "\u00a3350 - \u00a3450", "improvement_type": "G", "improvement_details": {"improvement_number": 13}, "improvement_category": 5, "energy_performance_rating": 66, "environmental_impact_rating": 47}, {"sequence": 5, "typical_saving": {"value": 370, "currency": "GBP"}, "indicative_cost": "\u00a33,500 - \u00a35,500", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 69, "environmental_impact_rating": 49}], "co2_emissions_potential": 15.6, "energy_rating_potential": 69, "lighting_cost_potential": {"value": 190, "currency": "GBP"}, "schema_version_original": "LIG-19.0", "alternative_improvements": [{"improvement": {"sequence": 1, "typical_saving": {"value": 403, "currency": "GBP"}, "improvement_type": "Q2", "improvement_details": {"improvement_number": 55}, "improvement_category": 6, "energy_performance_rating": 69, "environmental_impact_rating": 51}}], 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27, "low_energy_fixed_lighting_outlets_count": 5}
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18.6, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.16, "quantity": "metres"}, "total_floor_area": {"value": 40.62, "quantity": "square metres"}, "party_wall_length": {"value": 7.02, "quantity": "metres"}, "heat_loss_perimeter": {"value": 18.6, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "D", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "100mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "low_energy_lighting": 100, "solar_water_heating": "N", "habitable_room_count": 4, "heating_cost_current": {"value": 569, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 3.3, "energy_rating_average": 60, "energy_rating_current": 66, "lighting_cost_current": {"value": 69, "currency": "GBP"}, "main_heating_controls": [{"description": {"value": "Programmer, room thermostat and TRVs", "language": "1"}, 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"floor_construction": 2, "heat_loss_perimeter": {"value": 14.35, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.65, "quantity": "metres"}, "total_floor_area": {"value": 34.96, "quantity": "square metres"}, "party_wall_length": {"value": 7.6, "quantity": "metres"}, "heat_loss_perimeter": {"value": 13.65, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "A", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "200mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 3, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.24, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 12.29, "quantity": "square metres"}, "party_wall_length": {"value": 3.9, "quantity": "metres"}, 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"wind_turbines_count": 0, "wind_turbines_terrain_type": 1}, "secondary_heating": {"description": {"value": "None", "language": "1"}, "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "floor_heat_loss": 3, "roof_construction": 3, "wall_construction": 8, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.36, "quantity": "metres"}, "floor_insulation": 0, "total_floor_area": {"value": 38.8, "quantity": "square metres"}, "party_wall_length": {"value": 22.4, "quantity": "metres"}, "floor_construction": 0, "heat_loss_perimeter": {"value": 1, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.8, "quantity": "metres"}, "total_floor_area": {"value": 46.5, "quantity": "square metres"}, "party_wall_length": {"value": 5.8, "quantity": "metres"}, "heat_loss_perimeter": {"value": 5.8, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "K", "party_wall_construction": 0, "wall_thickness_measured": "N", "roof_insulation_location": "ND", "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI"}, {"identifier": "Extension", "wall_dry_lined": "N", "floor_heat_loss": 3, "roof_construction": 1, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.36, "quantity": "metres"}, "floor_insulation": 0, "total_floor_area": {"value": 17.4, "quantity": "square metres"}, "party_wall_length": {"value": 6, "quantity": "metres"}, "floor_construction": 0, "heat_loss_perimeter": {"value": 5.8, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "K", "party_wall_construction": 0, "wall_thickness_measured": "N", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}], "low_energy_lighting": 0, "solar_water_heating": "N", "habitable_room_count": 3, 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"construction_age_band": "B", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": "ND", "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension", "wall_dry_lined": "Y", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 5, "wall_construction": 3, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.19, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 10.67, "quantity": "square metres"}, "party_wall_length": {"value": 4.491, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 6.867, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], 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"main_heating_index_number": 18497}], "immersion_heating_type": "NA", "secondary_heating_type": 633, "has_fixed_air_conditioning": "false"}, "sap_version": 9.94, "schema_type": "RdSAP-Schema-20.0.0", "uprn_source": "Energy Assessor", "country_code": "EAW", "main_heating": [{"description": {"value": "Boiler and radiators, LPG", "language": "1"}, "energy_efficiency_rating": 2, "environmental_efficiency_rating": 4}], "dwelling_type": {"value": "Top-floor flat", "language": "1"}, "language_code": 1, "property_type": 2, "address_line_1": "Lloft Y Felin", "address_line_2": "Llangedwyn", "assessment_type": "RdSAP", "completion_date": "2022-02-09", "inspection_date": "2022-01-12", "extensions_count": 2, "measurement_type": 1, "sap_flat_details": {"level": 3, "top_storey": "Y", "flat_location": 1, "heat_loss_corridor": 0}, "total_floor_area": 111, "transaction_type": 5, "conservatory_type": 1, "heated_room_count": 4, "pvc_window_frames": "false", "registration_date": "2022-02-09", 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"improvement_details": {"improvement_number": 7}, "improvement_category": 5, "energy_performance_rating": 45, "environmental_impact_rating": 60}, {"sequence": 3, "typical_saving": {"value": 26, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a36,000", "improvement_type": "W2", "improvement_details": {"improvement_number": 58}, "improvement_category": 5, "energy_performance_rating": 46, "environmental_impact_rating": 61}, {"sequence": 4, "typical_saving": {"value": 25, "currency": "GBP"}, "indicative_cost": "\u00a380 - \u00a3120", "improvement_type": "D", "improvement_details": {"improvement_number": 10}, "improvement_category": 5, "energy_performance_rating": 47, "environmental_impact_rating": 61}, {"sequence": 5, "typical_saving": {"value": 36, "currency": "GBP"}, "indicative_cost": "\u00a330", "improvement_type": "E", "improvement_details": {"improvement_number": 35}, "improvement_category": 5, "energy_performance_rating": 48, "environmental_impact_rating": 62}, {"sequence": 6, "typical_saving": {"value": 28, "currency": "GBP"}, "indicative_cost": "\u00a3585 - \u00a3725", "improvement_type": "Y", "improvement_details": {"improvement_number": 49}, "improvement_category": 5, "energy_performance_rating": 49, "environmental_impact_rating": 63}, {"sequence": 7, "typical_saving": {"value": 83, "currency": "GBP"}, "indicative_cost": "\u00a33,300 - \u00a36,500", "improvement_type": "O", "improvement_details": {"improvement_number": 8}, "improvement_category": 5, "energy_performance_rating": 53, "environmental_impact_rating": 65}], "co2_emissions_potential": 4.2, "energy_rating_potential": 53, "lighting_cost_potential": {"value": 91, "currency": "GBP"}, "schema_version_original": "LIG-19.0", "hot_water_cost_potential": {"value": 148, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2272, "impact_of_loft_insulation": -1367, "impact_of_solid_wall_insulation": -11655, "space_heating_existing_dwelling": 26802}, 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"N", "improvement_details": {"improvement_number": 19}, "improvement_category": 5, "energy_performance_rating": 68, "environmental_impact_rating": 63}, {"sequence": 5, "typical_saving": {"value": 349, "currency": "GBP"}, "indicative_cost": "\u00a33,500 - \u00a35,500", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 78, "environmental_impact_rating": 72}, {"sequence": 6, "typical_saving": {"value": 695, "currency": "GBP"}, "indicative_cost": "\u00a315,000 - \u00a325,000", "improvement_type": "V2", "improvement_details": {"improvement_number": 44}, "improvement_category": 5, "energy_performance_rating": 99, "environmental_impact_rating": 91}], "co2_emissions_potential": 0.8, "energy_rating_potential": 99, "lighting_cost_potential": {"value": 90, "currency": "GBP"}, "schema_version_original": "LIG-19.0", "hot_water_cost_potential": {"value": 73, "currency": "GBP"}, "renewable_heat_incentive": 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"central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 637}], "immersion_heating_type": "NA", "has_fixed_air_conditioning": "false"}, "sap_version": 9.94, "schema_type": "RdSAP-Schema-20.0.0", "uprn_source": "Energy Assessor", "country_code": "EAW", "main_heating": [{"description": {"value": "Boiler and radiators, mains gas", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "dwelling_type": {"value": "Detached house", "language": "1"}, "language_code": 1, "property_type": 0, "address_line_1": "297a Goldington Road", "assessment_type": "RdSAP", "completion_date": "2022-08-11", "inspection_date": "2022-08-05", "extensions_count": 2, "measurement_type": 1, "total_floor_area": 141, "transaction_type": 1, "conservatory_type": 2, "heated_room_count": 6, "pvc_window_frames": "false", "registration_date": "2022-08-11", "sap_energy_source": {"mains_gas": "Y", "meter_type": 3, "photovoltaic_supply": {"none_or_no_details": {"pv_connection": 0, "percent_roof_area": 0}}, "wind_turbines_count": 0, "wind_turbines_terrain_type": 2}, "secondary_heating": {"description": {"value": "None", "language": "1"}, "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 280, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 4, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.5, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 61.08, "quantity": "square metres"}, "party_wall_length": 0, "floor_construction": 2, "heat_loss_perimeter": {"value": 25.26, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.5, "quantity": "metres"}, "total_floor_area": {"value": 50.36, "quantity": "square metres"}, "party_wall_length": 0, "heat_loss_perimeter": {"value": 20.4, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "E", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "200mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "floor_heat_loss": 7, "roof_construction": 5, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.3, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 8.32, "quantity": "square metres"}, "party_wall_length": 0, "floor_construction": 2, "heat_loss_perimeter": {"value": 13.6, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "G", "party_wall_construction": "NA", "wall_thickness_measured": "N", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 2", 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"main_heating_controls": [{"description": {"value": "Programmer, room thermostat and TRVs", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "multiple_glazing_type": 3, "open_fireplaces_count": 0, "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 699, "currency": "GBP"}, "hot_water_cost_current": {"value": 253, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 80, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 88, "currency": "GBP"}, "indicative_cost": "\u00a3800 - \u00a31,200", "improvement_type": "W1", "improvement_details": {"improvement_number": 57}, "improvement_category": 5, "energy_performance_rating": 58, "environmental_impact_rating": 49}, {"sequence": 2, "typical_saving": {"value": 28, "currency": "GBP"}, "indicative_cost": "\u00a320", "improvement_type": "E", "improvement_details": {"improvement_number": 35}, "improvement_category": 5, "energy_performance_rating": 59, "environmental_impact_rating": 49}, {"sequence": 3, "typical_saving": {"value": 296, "currency": "GBP"}, "indicative_cost": "\u00a32,200 - \u00a33,000", "improvement_type": "I", "improvement_details": {"improvement_number": 20}, "improvement_category": 5, "energy_performance_rating": 68, "environmental_impact_rating": 61}, {"sequence": 4, "typical_saving": {"value": 76, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a36,000", "improvement_type": "N", "improvement_details": {"improvement_number": 19}, "improvement_category": 5, "energy_performance_rating": 70, "environmental_impact_rating": 65}, {"sequence": 5, "typical_saving": {"value": 75, "currency": "GBP"}, "indicative_cost": "\u00a33,300 - \u00a36,500", "improvement_type": "O", "improvement_details": {"improvement_number": 8}, "improvement_category": 5, "energy_performance_rating": 73, "environmental_impact_rating": 68}, {"sequence": 6, "typical_saving": {"value": 370, "currency": "GBP"}, "indicative_cost": "\u00a33,500 - \u00a35,500", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 80, "environmental_impact_rating": 75}], "co2_emissions_potential": 3.2, "energy_rating_potential": 80, "lighting_cost_potential": {"value": 97, "currency": "GBP"}, "schema_version_original": "LIG-19.0", "alternative_improvements": [{"improvement": {"sequence": 1, "typical_saving": {"value": 469, "currency": "GBP"}, "improvement_type": "Z3", "improvement_details": {"improvement_number": 53}, "improvement_category": 6, "energy_performance_rating": 71, "environmental_impact_rating": 62}}], "hot_water_cost_potential": {"value": 71, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 4275, "impact_of_loft_insulation": -80, "space_heating_existing_dwelling": 16950}, "energy_consumption_current": 299, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 10, "calculation_software_version": "2.1.1.0", "energy_consumption_potential": 125, "environmental_impact_current": 45, "fixed_lighting_outlets_count": 12, "windows_transmission_details": {"u_value": 3.1, "data_source": 2, "solar_transmittance": 0.76}, "current_energy_efficiency_band": "D", "environmental_impact_potential": 75, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 53, "low_energy_fixed_lighting_outlets_count": 8}
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2, "heat_loss_perimeter": {"value": 11.57, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.72, "quantity": "metres"}, "total_floor_area": {"value": 50.32, "quantity": "square metres"}, "party_wall_length": {"value": 15.8, "quantity": "metres"}, "heat_loss_perimeter": {"value": 9.24, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "A", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 220, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 3, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.6, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 16.33, "quantity": "square metres"}, "party_wall_length": {"value": 4.68, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 4.68, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.57, "quantity": "metres"}, "total_floor_area": {"value": 16.48, "quantity": "square metres"}, "party_wall_length": {"value": 15.8, "quantity": "metres"}, "heat_loss_perimeter": {"value": 9.24, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "A", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "100mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 2", "wall_dry_lined": "N", "wall_thickness": 220, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 3, "building_part_number": 3, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.42, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 8.36, "quantity": "square metres"}, "party_wall_length": 0, 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"heat_loss_perimeter": {"value": 14.68, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI"}, {"identifier": "Extension", "wall_dry_lined": "Y", "floor_heat_loss": 3, "roof_construction": 5, "wall_construction": 3, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.8, "quantity": "metres"}, "floor_insulation": 0, "total_floor_area": {"value": 4.67, "quantity": "square metres"}, "party_wall_length": {"value": 2.94, "quantity": "metres"}, "floor_construction": 0, "heat_loss_perimeter": {"value": 4.53, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": 0, "wall_thickness_measured": "N", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI"}], 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"quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "E", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "100mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension", "wall_dry_lined": "Y", "wall_thickness": 260, "floor_heat_loss": 2, "roof_construction": 4, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.28, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 6.25, "quantity": "square metres"}, "party_wall_length": 0, "floor_construction": 3, "heat_loss_perimeter": {"value": 7.5, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "E", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "100mm", "wall_insulation_thickness": "NI", 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{"value": 16.53, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "F", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "150mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "low_energy_lighting": 100, "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 437, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 3.1, "energy_rating_average": 60, "energy_rating_current": 63, "lighting_cost_current": {"value": 63, "currency": "GBP"}, "main_heating_controls": [{"description": {"value": "Programmer and room thermostat", "language": "1"}, "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}], "multiple_glazing_type": 1, "open_fireplaces_count": 0, "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 321, "currency": "GBP"}, "hot_water_cost_current": {"value": 224, "currency": 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"currency": "GBP"}, "indicative_cost": "\u00a32,200 - \u00a33,000", "improvement_type": "I", "improvement_details": {"improvement_number": 20}, "improvement_category": 5, "energy_performance_rating": 74, "environmental_impact_rating": 74}, {"sequence": 5, "typical_saving": {"value": 33, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a36,000", "improvement_type": "N", "improvement_details": {"improvement_number": 19}, "improvement_category": 5, "energy_performance_rating": 75, "environmental_impact_rating": 76}, {"sequence": 6, "typical_saving": {"value": 391, "currency": "GBP"}, "indicative_cost": "\u00a33,500 - \u00a35,500", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 88, "environmental_impact_rating": 87}], "co2_emissions_potential": 0.7, "energy_rating_potential": 88, "lighting_cost_potential": {"value": 63, "currency": "GBP"}, "schema_version_original": "LIG-19.0", 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103, "low_energy_fixed_lighting_outlets_count": 9}
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1, "main_heating_control": 2102, "main_heating_category": 2, "main_heating_fraction": 1, "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 4148}], "immersion_heating_type": "NA", "cylinder_insulation_type": 2, "has_fixed_air_conditioning": "false", "cylinder_insulation_thickness": 50}, "sap_version": 9.94, "schema_type": "RdSAP-Schema-20.0.0", "uprn_source": "Energy Assessor", "country_code": "EAW", "main_heating": [{"description": {"value": "Boiler and radiators, oil", "language": "1"}, "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}], "dwelling_type": {"value": "Detached house", "language": "1"}, "language_code": 1, "property_type": 0, "address_line_1": "Llys-Yr-Awel", "address_line_2": "Erw Hir", "address_line_3": "Llantrisant", "assessment_type": "RdSAP", "completion_date": "2022-02-07", "inspection_date": "2022-02-07", "extensions_count": 2, "measurement_type": 1, "total_floor_area": 126, "transaction_type": 5, 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"total_floor_area": {"value": 54.5, "quantity": "square metres"}, "party_wall_length": 0, "heat_loss_perimeter": {"value": 30.02, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "E", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "270mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.19, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 3.77, "quantity": "square metres"}, "party_wall_length": 0, "floor_construction": 1, "heat_loss_perimeter": {"value": 5.57, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "G", "party_wall_construction": "NA", 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\u00a36,000", "improvement_type": "W2", "improvement_details": {"improvement_number": 58}, "improvement_category": 5, "energy_performance_rating": 62, "environmental_impact_rating": 43}, {"sequence": 2, "typical_saving": {"value": 17, "currency": "GBP"}, "indicative_cost": "\u00a315 - \u00a330", "improvement_type": "C", "improvement_details": {"improvement_number": 3}, "improvement_category": 5, "energy_performance_rating": 62, "environmental_impact_rating": 44}, {"sequence": 3, "typical_saving": {"value": 183, "currency": "GBP"}, "indicative_cost": "\u00a31,600 - \u00a32,400", "improvement_type": "L2", "improvement_details": {"improvement_number": 60}, "improvement_category": 5, "energy_performance_rating": 68, "environmental_impact_rating": 49}, {"sequence": 4, "typical_saving": {"value": 74, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a36,000", "improvement_type": "N", "improvement_details": {"improvement_number": 19}, "improvement_category": 5, "energy_performance_rating": 70, "environmental_impact_rating": 54}, {"sequence": 5, "typical_saving": {"value": 392, "currency": "GBP"}, "indicative_cost": "\u00a33,500 - 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"energy_efficiency_rating": 4, "environmental_efficiency_rating": 5}], "dwelling_type": "Mid-terrace house", "language_code": 1, "property_type": 0, "address_line_1": "6 Menakarne", "address_line_2": "Carharrack", "assessment_type": "RdSAP", "completion_date": "2022-05-11", "inspection_date": "2022-05-09", "extensions_count": 0, "measurement_type": 1, "total_floor_area": 94, "transaction_type": 13, "conservatory_type": 1, "heated_room_count": 4, "pvc_window_frames": "true", "registration_date": "2022-05-11", "sap_energy_source": {"mains_gas": "Y", "meter_type": 1, "photovoltaic_supply": {"none_or_no_details": {"pv_connection": 0, "percent_roof_area": 0}}, "wind_turbines_count": 0, "wind_turbines_terrain_type": 2}, "secondary_heating": {"description": "None", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "lzc_energy_sources": [9], "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, 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4.3, "energy_rating_average": 60, "energy_rating_current": 61, "lighting_cost_current": {"value": 76, "currency": "GBP"}, "main_heating_controls": [{"description": {"value": "Programmer and room thermostat", "language": "1"}, "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}], "multiple_glazing_type": 2, "open_fireplaces_count": 2, "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 426, "currency": "GBP"}, "hot_water_cost_current": {"value": 130, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 206, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a314,000", "improvement_type": "Q", "improvement_details": {"improvement_number": 7}, "improvement_category": 5, "energy_performance_rating": 70, "environmental_impact_rating": 66}, {"sequence": 2, "typical_saving": {"value": 44, "currency": "GBP"}, "indicative_cost": "\u00a3800 - \u00a31,200", 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"roof_insulation_thickness": "200mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension", "wall_dry_lined": "N", "wall_thickness": 290, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.3, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 42.43, "quantity": "square metres"}, "party_wall_length": 0, "floor_construction": 1, "heat_loss_perimeter": {"value": 23.17, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "G", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "200mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "low_energy_lighting": 100, "solar_water_heating": "N", "habitable_room_count": 6, "heating_cost_current": {"value": 1253, "currency": "GBP"}, 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{"value": 12.48, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.61, "quantity": "metres"}, "total_floor_area": {"value": 45.02, "quantity": "square metres"}, "party_wall_length": {"value": 11.45, "quantity": "metres"}, "heat_loss_perimeter": {"value": 20.23, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "B", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "150mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 5, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.4, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 19.33, "quantity": "square metres"}, "party_wall_length": {"value": 4.51, "quantity": "metres"}, "floor_construction": 1, 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"floor_insulation": 1, "total_floor_area": {"value": 36.8424, "quantity": "square metres"}, "party_wall_length": {"value": 7.14, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 13.52, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "E", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension", "wall_dry_lined": "N", "wall_thickness": 320, "floor_heat_loss": 7, "roof_construction": 5, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.35, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 12.9232, "quantity": "square metres"}, "party_wall_length": 0, "floor_construction": 1, "heat_loss_perimeter": {"value": 10.5, "quantity": "metres"}}], "wall_insulation_type": 4, 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"heat_loss_perimeter": {"value": 9.58, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.795, "quantity": "metres"}, "total_floor_area": {"value": 49.28, "quantity": "square metres"}, "party_wall_length": {"value": 16.82, "quantity": "metres"}, "heat_loss_perimeter": {"value": 11.72, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "350mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension", "wall_dry_lined": "Y", "wall_thickness": 280, "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.496, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 9.3, "quantity": "square metres"}, "party_wall_length": 0, "floor_construction": 1, 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{"value": 2.41, "quantity": "metres"}, "total_floor_area": {"value": 60.72, "quantity": "square metres"}, "party_wall_length": {"value": 9.81, "quantity": "metres"}, "heat_loss_perimeter": {"value": 18.69, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "F", "party_wall_construction": 0, "wall_thickness_measured": "N", "roof_insulation_location": 2, "roof_insulation_thickness": "100mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "floor_heat_loss": 7, "roof_construction": 5, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.28, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 7.86, "quantity": "square metres"}, "party_wall_length": {"value": 2.7, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 5.61, "quantity": "metres"}}], "wall_insulation_type": 4, 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{"floor": 1, "room_height": {"value": 2.27, "quantity": "metres"}, "total_floor_area": {"value": 15.09, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "heat_loss_perimeter": {"value": 10.99, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "G", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}], "low_energy_lighting": 40, "solar_water_heating": "N", "habitable_room_count": 6, "heating_cost_current": {"value": 629, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 4.1, "energy_rating_average": 60, "energy_rating_current": 70, "lighting_cost_current": {"value": 152, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], 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{"value": 102, "currency": "GBP"}, "main_heating_controls": [{"description": {"value": "Programmer and room thermostat", "language": "1"}, "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}], "multiple_glazing_type": "ND", "open_fireplaces_count": 0, "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 368, "currency": "GBP"}, "hot_water_cost_current": {"value": 76, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 48, "currency": "GBP"}, "indicative_cost": "\u00a3850 - \u00a31,500", "improvement_type": "A2", "improvement_details": {"improvement_number": 45}, "improvement_category": 5, "energy_performance_rating": 64, "environmental_impact_rating": 58}, {"sequence": 2, "typical_saving": {"value": 167, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a314,000", "improvement_type": "Q", "improvement_details": {"improvement_number": 7}, 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{"value": 7.11, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 12.22, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.53, "quantity": "metres"}, "total_floor_area": {"value": 36.11, "quantity": "square metres"}, "party_wall_length": {"value": 7.11, "quantity": "metres"}, "heat_loss_perimeter": {"value": 17.33, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "C", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "300mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.44, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 14.25, "quantity": "square metres"}, 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"construction_age_band": "E", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "250mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension", "wall_dry_lined": "N", "wall_thickness": 270, "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.35, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 4.54, "quantity": "square metres"}, "party_wall_length": 0, "floor_construction": 1, "heat_loss_perimeter": {"value": 6.19, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "F", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}], "low_energy_lighting": 67, 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"energy_performance_rating": 63, "environmental_impact_rating": 49}, {"sequence": 2, "typical_saving": {"value": 18, "currency": "GBP"}, "indicative_cost": "\u00a320", "improvement_type": "E", "improvement_details": {"improvement_number": 35}, "improvement_category": 5, "energy_performance_rating": 64, "environmental_impact_rating": 50}, {"sequence": 3, "typical_saving": {"value": 306, "currency": "GBP"}, "indicative_cost": "\u00a32,000 - \u00a33,000", "improvement_type": "L2", "improvement_details": {"improvement_number": 59}, "improvement_category": 5, "energy_performance_rating": 74, "environmental_impact_rating": 55}, {"sequence": 4, "typical_saving": {"value": 76, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a36,000", "improvement_type": "N", "improvement_details": {"improvement_number": 19}, "improvement_category": 5, "energy_performance_rating": 76, "environmental_impact_rating": 60}, {"sequence": 5, "typical_saving": {"value": 387, "currency": "GBP"}, 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"lighting_cost_current": {"value": 79, "currency": "GBP"}, "main_heating_controls": [{"description": {"value": "Programmer, room thermostat and TRVs", "language": "1"}, "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "multiple_glazing_type": 2, "open_fireplaces_count": 0, "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 377, "currency": "GBP"}, "hot_water_cost_current": {"value": 87, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 148, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a314,000", "improvement_type": "Q", "improvement_details": {"improvement_number": 7}, "improvement_category": 5, "energy_performance_rating": 75, "environmental_impact_rating": 74}, {"sequence": 2, "typical_saving": {"value": 40, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a36,000", "improvement_type": "W2", "improvement_details": 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"environmental_efficiency_rating": 0}, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 6, "roof_construction": 3, "wall_construction": 4, "building_part_number": 1, "sap_alternative_wall": {"wall_area": 12.034, "sheltered_wall": "Y", "wall_dry_lined": "N", "wall_thickness": 100, "wall_construction": 8, "wall_insulation_type": 4, "wall_thickness_measured": "Y", "wall_insulation_thickness": "NI"}, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.2, "quantity": "metres"}, "total_floor_area": {"value": 73.99, "quantity": "square metres"}, "party_wall_length": {"value": 19.62, "quantity": "metres"}, "heat_loss_perimeter": {"value": 10.94, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "D", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": "ND", "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI"}], 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"environmental_efficiency_rating": 4}], "dwelling_type": "Semi-detached house", "language_code": 1, "property_type": 0, "address_line_1": "49 Marlborough Road", "assessment_type": "RdSAP", "completion_date": "2022-11-22", "inspection_date": "2022-11-07", "extensions_count": 1, "measurement_type": 1, "total_floor_area": 86, "transaction_type": 2, "conservatory_type": 1, "heated_room_count": 5, "registration_date": "2022-11-22", "sap_energy_source": {"mains_gas": "Y", "meter_type": 1, "photovoltaic_supply": {"none_or_no_details": {"pv_connection": 0, "percent_roof_area": 0}}, "wind_turbines_count": 0, "wind_turbines_terrain_type": 1}, "secondary_heating": {"description": "Room heaters, electric", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 290, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 8, "building_part_number": 1, "sap_floor_dimensions": 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2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.12, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 4.52, "quantity": "square metres"}, "party_wall_length": {"value": 3.62, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 6.12, "quantity": "metres"}}], "wall_insulation_type": 1, "construction_age_band": "D", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 6, "wall_insulation_thickness": "100mm", "floor_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}], "low_energy_lighting": 78, "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 576, "currency": "GBP"}, "insulated_door_count": 2, "co2_emissions_current": 2.8, "energy_rating_average": 60, "energy_rating_current": 70, "lighting_cost_current": {"value": 101, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "multiple_glazing_type": 2, "open_fireplaces_count": 0, "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 463, "currency": "GBP"}, "hot_water_cost_current": {"value": 84, "currency": "GBP"}, "insulated_door_u_value": 1.5, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 28, "currency": "GBP"}, "indicative_cost": "\u00a3100 - \u00a3350", "improvement_type": "A", "improvement_details": {"improvement_number": 5}, "improvement_category": 5, "energy_performance_rating": 71, "environmental_impact_rating": 72}, {"sequence": 2, "typical_saving": {"value": 28, "currency": "GBP"}, "indicative_cost": "\u00a3850 - \u00a31,500", "improvement_type": "A2", "improvement_details": {"improvement_number": 45}, "improvement_category": 5, "energy_performance_rating": 72, "environmental_impact_rating": 73}, {"sequence": 3, 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"emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2106, "main_heating_category": 2, "main_heating_fraction": 1, "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 18218}], "immersion_heating_type": "NA", "secondary_heating_type": 605, "has_fixed_air_conditioning": "false"}, "sap_version": 9.94, "schema_type": "RdSAP-Schema-20.0.0", "uprn_source": "Energy Assessor", "country_code": "EAW", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "dwelling_type": "Mid-terrace house", "language_code": 1, "property_type": 0, "address_line_1": "38 Pendennis Park", "assessment_type": "RdSAP", "completion_date": "2022-08-10", "inspection_date": "2022-08-09", "extensions_count": 3, "measurement_type": 1, "total_floor_area": 86, "transaction_type": 1, "conservatory_type": 1, "heated_room_count": 3, "pvc_window_frames": "true", "registration_date": "2022-08-10", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "photovoltaic_supply": {"none_or_no_details": {"pv_connection": 0, "percent_roof_area": 0}}, "wind_turbines_count": 0, "wind_turbines_terrain_type": 2}, "secondary_heating": {"description": "Room heaters, mains gas", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 255, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 3, "building_part_number": 1, "sap_alternative_wall": {"wall_area": 15.3, "wall_dry_lined": "N", "wall_thickness": 390, "wall_construction": 2, "wall_insulation_type": 4, "wall_thickness_measured": "Y", "wall_insulation_thickness": "NI"}, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.57, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 21.96, "quantity": "square metres"}, "party_wall_length": {"value": 8.5, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 5.46, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.63, "quantity": "metres"}, "total_floor_area": {"value": 20.87, "quantity": "square metres"}, "party_wall_length": {"value": 8.64, "quantity": "metres"}, "heat_loss_perimeter": {"value": 4.83, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "250mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 255, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 3, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.57, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 14.58, "quantity": "square metres"}, "party_wall_length": {"value": 6, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 2.74, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.63, "quantity": "metres"}, "total_floor_area": {"value": 14.49, "quantity": "square metres"}, "party_wall_length": {"value": 6, "quantity": "metres"}, "heat_loss_perimeter": {"value": 4.83, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 2", "wall_dry_lined": "N", "wall_thickness": 270, "floor_heat_loss": 7, "roof_construction": 5, "wall_construction": 3, "building_part_number": 3, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.2, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 2.33, "quantity": "square metres"}, "party_wall_length": {"value": 1.1, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 1.1, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 3", "wall_dry_lined": "N", "wall_thickness": 270, "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 3, "building_part_number": 4, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.2, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 11.36, "quantity": "square metres"}, "party_wall_length": {"value": 5.3, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 7.48, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}], "low_energy_lighting": 67, "solar_water_heating": "N", "habitable_room_count": 3, "heating_cost_current": {"value": 651, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 4.0, "energy_rating_average": 60, "energy_rating_current": 60, "lighting_cost_current": {"value": 95, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "multiple_glazing_type": 3, "open_fireplaces_count": 0, "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 454, "currency": "GBP"}, "hot_water_cost_current": {"value": 91, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 41, "currency": "GBP"}, "indicative_cost": "\u00a3850 - \u00a31,500", "improvement_type": "A2", "improvement_details": {"improvement_number": 45}, "improvement_category": 5, "energy_performance_rating": 62, "environmental_impact_rating": 56}, {"sequence": 2, "typical_saving": {"value": 135, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a314,000", "improvement_type": "Q", "improvement_details": {"improvement_number": 7}, "improvement_category": 5, "energy_performance_rating": 69, "environmental_impact_rating": 65}, {"sequence": 3, "typical_saving": {"value": 22, "currency": "GBP"}, "indicative_cost": "\u00a3800 - \u00a31,200", "improvement_type": "W1", "improvement_details": {"improvement_number": 57}, "improvement_category": 5, "energy_performance_rating": 70, "environmental_impact_rating": 67}, {"sequence": 4, "typical_saving": {"value": 21, "currency": "GBP"}, "indicative_cost": "\u00a320", "improvement_type": "E", "improvement_details": {"improvement_number": 35}, "improvement_category": 5, "energy_performance_rating": 71, "environmental_impact_rating": 68}, {"sequence": 5, "typical_saving": {"value": 28, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a36,000", "improvement_type": "N", "improvement_details": {"improvement_number": 19}, "improvement_category": 5, "energy_performance_rating": 72, "environmental_impact_rating": 70}, {"sequence": 6, "typical_saving": {"value": 367, "currency": "GBP"}, "indicative_cost": "\u00a33,500 - \u00a35,500", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 82, "environmental_impact_rating": 79}], "co2_emissions_potential": 1.6, "energy_rating_potential": 82, "lighting_cost_potential": {"value": 71, "currency": "GBP"}, "schema_version_original": "20.0.0", "hot_water_cost_potential": {"value": 64, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2155, "impact_of_loft_insulation": -1387, "impact_of_solid_wall_insulation": -3047, "space_heating_existing_dwelling": 11595}, "energy_consumption_current": 265, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "4.09r0002", "energy_consumption_potential": 103, "environmental_impact_current": 54, "fixed_lighting_outlets_count": 12, "current_energy_efficiency_band": "D", "environmental_impact_potential": 79, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "B", "co2_emissions_current_per_floor_area": 47, "low_energy_fixed_lighting_outlets_count": 8}
diff --git a/backend/epc_api/json_samples/RdSAP-Schema-21.0.1/corpus.jsonl b/backend/epc_api/json_samples/RdSAP-Schema-21.0.1/corpus.jsonl
new file mode 100644
index 00000000..74255c51
--- /dev/null
+++ b/backend/epc_api/json_samples/RdSAP-Schema-21.0.1/corpus.jsonl
@@ -0,0 +1,1000 @@
+{"uprn": 10000452538, "roofs": [{"description": "Pitched, insulated (assumed)", "energy_efficiency_rating": 5, "environmental_efficiency_rating": 5}], "walls": [{"description": "Timber frame, as built, insulated (assumed)", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "floors": [{"description": "Solid, insulated (assumed)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}], "status": "entered", "tenure": 3, "window": {"description": "Fully double glazed", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}, "lighting": {"description": "Good lighting efficiency", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "postcode": "RG24 9SJ", "hot_water": {"description": "From main system", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "BASINGSTOKE", "built_form": 4, "created_at": "2026-04-01 20:40:29", "door_count": 2, "region_code": 16, "report_type": 2, "sap_heating": {"number_baths": 1, "cylinder_size": 1, "number_baths_wwhrs": 0, "water_heating_code": 901, "water_heating_fuel": 26, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2106, "main_heating_category": 2, "main_heating_fraction": 1, "sap_main_heating_code": 104, "central_heating_pump_age": 0, "main_heating_data_source": 2}], "immersion_heating_type": "NA", "has_fixed_air_conditioning": "false"}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 2, "window_width": 1.17, "window_height": 0.96, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 2, "window_width": 1.17, "window_height": 1.46, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 2, "window_width": 1.17, "window_height": 0.96, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 2, "window_width": 1.17, "window_height": 1, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 2, "window_width": 1.17, "window_height": 0.96, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 2, "window_width": 0.6, "window_height": 0.96, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Mid-terrace house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "10 Julius Close", "assessment_type": "RdSAP", "completion_date": "2026-04-01", "inspection_date": "2026-04-01", "extensions_count": 0, "measurement_type": 1, "total_floor_area": 58, "transaction_type": 8, "conservatory_type": 1, "heated_room_count": 3, "registration_date": "2026-04-01", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "false"}, "secondary_heating": {"description": "None", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 5, "wall_construction": 5, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.4, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 28.88, "quantity": "square metres"}, "party_wall_length": {"value": 14.66, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 7.88, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.4, "quantity": "metres"}, "total_floor_area": {"value": 28.88, "quantity": "square metres"}, "party_wall_length": {"value": 14.66, "quantity": "metres"}, "heat_loss_perimeter": {"value": 7.88, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "J", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 3, "heating_cost_current": {"value": 447, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 1.5, "energy_rating_average": 60, "energy_rating_current": 77, "lighting_cost_current": {"value": 44, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 447, "currency": "GBP"}, "hot_water_cost_current": {"value": 201, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 75, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 195, "currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 82, "environmental_impact_rating": 81}], "co2_emissions_potential": 1.4, "energy_rating_potential": 82, "lighting_cost_potential": {"value": 44, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 201, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2168.7, "space_heating_existing_dwelling": 3382.7}, "draughtproofed_door_count": 0, "energy_consumption_current": 141, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0335", "energy_consumption_potential": 123, "environmental_impact_current": 80, "current_energy_efficiency_band": "C", "environmental_impact_potential": 81, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "B", "co2_emissions_current_per_floor_area": 25, "low_energy_fixed_lighting_bulbs_count": 8, "incandescent_fixed_lighting_bulbs_count": 0}
+{"uprn": 100030488548, "roofs": [{"description": "Pitched, insulated (assumed)", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}], "walls": [{"description": "Solid brick, as built, no insulation (assumed)", "energy_efficiency_rating": 1, "environmental_efficiency_rating": 1}], "floors": [{"description": "Suspended, no insulation (assumed)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, {"description": "Solid, no insulation (assumed)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}], "status": "entered", "tenure": 3, "window": {"description": "Mostly double glazing", "energy_efficiency_rating": 2, "environmental_efficiency_rating": 2}, "addendum": {"addendum_numbers": [15]}, "lighting": {"description": "Below average lighting efficiency", "energy_efficiency_rating": 2, "environmental_efficiency_rating": 2}, "postcode": "LE16 9EU", "hot_water": {"description": "From main system", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "MARKET HARBOROUGH", "psv_count": 2, "built_form": 4, "created_at": "2026-03-11 17:32:44", "door_count": 2, "region_code": 6, "report_type": 2, "sap_heating": {"number_baths": 1, "cylinder_size": 2, "shower_outlets": [{"shower_outlet": {"shower_wwhrs": 1, "shower_outlet_type": 1}}], "number_baths_wwhrs": 0, "water_heating_code": 901, "water_heating_fuel": 26, "cylinder_thermostat": "Y", "secondary_fuel_type": 26, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": "NA", "main_heating_number": 1, "main_heating_control": 2104, "main_heating_category": 2, "main_heating_fraction": 1, "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 1848}], "immersion_heating_type": "NA", "secondary_heating_type": 601, "cylinder_insulation_type": 1, "has_fixed_air_conditioning": "false", "cylinder_insulation_thickness": 25}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "glazing_gap": "16+", "orientation": 1, "window_type": 1, "glazing_type": 3, "window_width": 1.2, "window_height": 1.6, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 1, "window_type": 1, "glazing_type": 3, "window_width": 1.3, "window_height": 1.75, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 3, "window_type": 1, "glazing_type": 3, "window_width": 0.4, "window_height": 1.75, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 7, "window_type": 1, "glazing_type": 3, "window_width": 0.4, "window_height": 1.75, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 5, "window_type": 1, "glazing_type": 3, "window_width": 1, "window_height": 1.5, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 5, "window_type": 1, "glazing_type": 5, "window_width": 1.05, "window_height": 1.5, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 5, "window_width": 0.9, "window_height": 1, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 7, "window_type": 1, "glazing_type": 3, "window_width": 0.7, "window_height": 1.2, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 5, "window_type": 1, "glazing_type": 3, "window_width": 0.9, "window_height": 1, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 5, "window_type": 1, "glazing_type": 3, "window_width": 1.1, "window_height": 1.2, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Mid-terrace house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "15 Granville Street", "assessment_type": "RdSAP", "completion_date": "2026-03-11", "inspection_date": "2026-03-11", "extensions_count": 1, "measurement_type": 1, "total_floor_area": 89, "transaction_type": 8, "conservatory_type": 1, "heated_room_count": 5, "registration_date": "2026-03-11", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "true", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "true"}, 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"glazing_type": 2, "window_width": 0.87, "window_height": 1.14, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 4, "window_type": 1, "glazing_type": 2, "window_width": 1.76, "window_height": 1.98, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Top-floor flat", "language_code": 1, "pressure_test": 4, "property_type": 2, "address_line_1": "Flat 13", "address_line_2": "Brook House", 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"quantity": "square metres"}, "party_wall_length": {"value": 10.04, "quantity": "metres"}, "heat_loss_perimeter": {"value": 16.06, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "A", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "300mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 3, "heating_cost_current": {"value": 667, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 2.2, "energy_rating_average": 60, "energy_rating_current": 67, "lighting_cost_current": {"value": 44, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 418, "currency": "GBP"}, "hot_water_cost_current": {"value": 256, 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"incandescent_fixed_lighting_bulbs_count": 0}
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{"value": 7.83, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.25, "quantity": "metres"}, "total_floor_area": {"value": 37.85, "quantity": "square metres"}, "party_wall_length": {"value": 15.89, "quantity": "metres"}, "heat_loss_perimeter": {"value": 9.45, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "E", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.4, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 7.12, "quantity": "square metres"}, "party_wall_length": {"value": 4.15, "quantity": "metres"}, "floor_construction": 1, 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"true", "glazing_gap": "16+", "orientation": 4, "window_type": 1, "glazing_type": 3, "window_width": 1.04, "window_height": 1.68, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 8, "window_type": 1, "glazing_type": 3, "window_width": 1, "window_height": 1.67, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 8, "window_type": 1, "glazing_type": 3, "window_width": 1, "window_height": 1.67, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Mid-terrace house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "10 Montague Road", "address_line_2": "Old Swan", "assessment_type": "RdSAP", "completion_date": "2026-04-02", "inspection_date": "2026-02-27", "extensions_count": 2, "measurement_type": 1, "total_floor_area": 97, "transaction_type": 14, "conservatory_type": 1, "heated_room_count": 5, "registration_date": "2026-04-02", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "false"}, "secondary_heating": {"description": "None", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "extract_fans_count": 2, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 280, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 3, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.84, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 39.01, "quantity": "square metres"}, "party_wall_length": {"value": 17.64, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 6.44, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.72, "quantity": "metres"}, "total_floor_area": {"value": 37.74, "quantity": "square metres"}, "party_wall_length": {"value": 17.64, "quantity": "metres"}, "heat_loss_perimeter": {"value": 6.44, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "NI", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.55, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 6.86, "quantity": "square metres"}, "party_wall_length": {"value": 3.24, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 3.24, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.28, "quantity": "metres"}, "total_floor_area": {"value": 6.86, "quantity": "square metres"}, "party_wall_length": {"value": 3.24, "quantity": "metres"}, "heat_loss_perimeter": {"value": 5.36, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "F", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "NI", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 2", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 4, "building_part_number": 3, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.3, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 6.04, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 7.82, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "F", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "NI", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", 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"photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "true", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "true"}, "secondary_heating": {"description": "Room heaters, dual fuel (mineral and wood)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "extract_fans_count": 1, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "Y", "floor_heat_loss": 7, "sap_room_in_roof": {"floor_area": 23.71, "room_in_roof_type_1": {"gable_wall_type_1": 0, "gable_wall_type_2": 1, "gable_wall_length_1": 4.5, "gable_wall_length_2": 4.5}, "construction_age_band": "F"}, "roof_construction": 4, "wall_construction": 3, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.37, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 43.64, "quantity": "square metres"}, 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"total_floor_area": {"value": 11.68, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "heat_loss_perimeter": {"value": 7.92, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "L", "party_wall_construction": "NA", "wall_thickness_measured": "N", "roof_insulation_location": 1, "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI", "rafter_insulation_thickness": "100mm"}], "solar_water_heating": "N", "habitable_room_count": 7, "heating_cost_current": {"value": 1383, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 4.3, "energy_rating_average": 60, "energy_rating_current": 72, "lighting_cost_current": {"value": 81, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 1157, "currency": "GBP"}, 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"environmental_impact_rating": 75}], "co2_emissions_potential": 3.5, "energy_rating_potential": 78, "lighting_cost_potential": {"value": 81, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 217, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2818.62, "space_heating_existing_dwelling": 15427.93}, "draughtproofed_door_count": 1, "energy_consumption_current": 150, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0332", "energy_consumption_potential": 119, "environmental_impact_current": 70, "current_energy_efficiency_band": "C", "environmental_impact_potential": 75, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 26, "low_energy_fixed_lighting_bulbs_count": 34, "incandescent_fixed_lighting_bulbs_count": 0}
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"permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 4, "window_type": 1, "glazing_type": 2, "window_width": 1.91, "window_height": 1.49, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 8, "window_type": 1, "glazing_type": 2, "window_width": 0.59, "window_height": 1, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 4, "window_type": 1, "glazing_type": 2, "window_width": 0.89, "window_height": 0.94, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", 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5DJ", "hot_water": {"description": "From main system", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "WILMSLOW", "built_form": 1, "created_at": "2026-05-07 10:08:39", "door_count": 2, "region_code": 19, "report_type": 2, "sap_heating": {"number_baths": 1, "cylinder_size": 4, "shower_outlets": [{"shower_wwhrs": 1, "shower_outlet_type": 1}, {"shower_wwhrs": 1, "shower_outlet_type": 1}, {"shower_wwhrs": 1, "shower_outlet_type": 1}], "number_baths_wwhrs": 0, "water_heating_code": 901, "water_heating_fuel": 26, "cylinder_thermostat": "Y", "secondary_fuel_type": 9, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": "NA", "main_heating_number": 1, "main_heating_control": 2106, "main_heating_category": 2, "main_heating_fraction": 1, "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 4045}], "immersion_heating_type": "NA", "secondary_heating_type": 633, "cylinder_insulation_type": 1, "has_fixed_air_conditioning": "false", "cylinder_insulation_thickness": 25}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 5, "window_width": 1.4, "window_height": 1.8, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 2, "window_type": 1, "glazing_type": 5, "window_width": 0.55, "window_height": 1.8, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 4, "window_type": 1, "glazing_type": 5, "window_width": 0.55, "window_height": 1.8, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 5, "window_width": 0.6, "window_height": 1, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 4, "window_type": 1, "glazing_type": 5, "window_width": 2.7, "window_height": 1.8, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 5, "window_type": 1, "glazing_type": 5, "window_width": 1.2, "window_height": 1.3, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 2, "window_width": 2, "window_height": 2.1, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 2, "window_width": 1.7, "window_height": 1.3, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 1.1, "window_height": 0.95, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 5, "window_width": 2.5, "window_height": 1.5, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 5, "window_width": 1.2, 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"permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 1.7, "window_height": 1.1, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Detached house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "9 Carrwood Road", "assessment_type": "RdSAP", "completion_date": "2026-05-07", "inspection_date": "2026-05-06", "extensions_count": 1, "measurement_type": 1, "total_floor_area": 190, "transaction_type": 1, "conservatory_type": 1, 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0, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 30.31, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.62, "quantity": "metres"}, "total_floor_area": {"value": 65.89, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "heat_loss_perimeter": {"value": 30.31, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "C", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "250mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 285, "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.62, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 29.16, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 12.42, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.64, "quantity": "metres"}, "total_floor_area": {"value": 29.16, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "heat_loss_perimeter": {"value": 12.42, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "E", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}], "solar_water_heating": "N", "habitable_room_count": 7, "heating_cost_current": {"value": 2548, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 7.4, "energy_rating_average": 60, "energy_rating_current": 61, "lighting_cost_current": {"value": 131, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 1721, "currency": "GBP"}, "hot_water_cost_current": {"value": 352, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 38, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 142, "currency": "GBP"}, "indicative_cost": "\u00a3900 - \u00a31,200", "improvement_type": "A2", "improvement_details": {"improvement_number": 45}, "improvement_category": 5, "energy_performance_rating": 63, "environmental_impact_rating": 58}, {"sequence": 2, "typical_saving": {"value": 176, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W1", "improvement_details": {"improvement_number": 57}, "improvement_category": 5, "energy_performance_rating": 65, "environmental_impact_rating": 61}, {"sequence": 3, "typical_saving": {"value": 74, "currency": "GBP"}, "indicative_cost": "\u00a3150 - \u00a3250", "improvement_type": "D", "improvement_details": {"improvement_number": 10}, "improvement_category": 5, "energy_performance_rating": 66, "environmental_impact_rating": 63}, {"sequence": 4, "typical_saving": {"value": 39, "currency": "GBP"}, "indicative_cost": "\u00a3390 - \u00a3455", "improvement_type": "E", "improvement_details": {"improvement_number": 35}, "improvement_category": 5, "energy_performance_rating": 66, "environmental_impact_rating": 63}, {"sequence": 5, "typical_saving": {"value": 285, "currency": "GBP"}, "indicative_cost": "\u00a32,200 - \u00a33,500", "improvement_type": "I", "improvement_details": {"improvement_number": 20}, "improvement_category": 5, "energy_performance_rating": 70, "environmental_impact_rating": 67}, {"sequence": 6, "typical_saving": {"value": 228, "currency": "GBP"}, "indicative_cost": "\u00a34,500 - \u00a36,000", "improvement_type": "O", "improvement_details": {"improvement_number": 8}, "improvement_category": 5, "energy_performance_rating": 73, "environmental_impact_rating": 71}, {"sequence": 7, "typical_saving": {"value": 238, "currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 75, "environmental_impact_rating": 71}], "co2_emissions_potential": 4.8, "energy_rating_potential": 75, "lighting_cost_potential": {"value": 85, "currency": "GBP"}, "schema_version_original": "21.0.1", "alternative_improvements": [{"sequence": 1, "typical_saving": {"value": 469, "currency": "GBP"}, "improvement_type": "J2", "improvement_details": {"improvement_number": 54}, "improvement_category": 6, "energy_performance_rating": 64, "environmental_impact_rating": 93}, {"sequence": 2, "typical_saving": {"value": 156, "currency": "GBP"}, "improvement_type": "Z3", "improvement_details": {"improvement_number": 53}, "improvement_category": 6, 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"postcode": "SE9 4AA", "hot_water": {"description": "From main system", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "LONDON", "built_form": 4, "created_at": "2026-05-11 14:51:56", "door_count": 2, "region_code": 17, "report_type": 2, "sap_heating": {"number_baths": 1, "cylinder_size": 1, "shower_outlets": [{"shower_wwhrs": 1, "shower_outlet_type": 1}], "number_baths_wwhrs": 0, "water_heating_code": 901, "water_heating_fuel": 26, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2106, "main_heating_category": 2, "main_heating_fraction": 1, "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 17507}], "immersion_heating_type": "NA", "has_fixed_air_conditioning": "false"}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "glazing_gap": "16+", "orientation": 3, "window_type": 1, "glazing_type": 3, "window_width": 1.77, "window_height": 1.25, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 7, "window_type": 1, "glazing_type": 3, "window_width": 1.89, "window_height": 1.25, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 5, "window_type": 1, "glazing_type": 3, "window_width": 1.12, "window_height": 1, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 3, "window_type": 1, "glazing_type": 3, "window_width": 1.48, "window_height": 1.16, "draught_proofed": "true", 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"total_floor_area": {"value": 5.82, "quantity": "square metres"}, "party_wall_length": {"value": 3.51, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 5.17, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "D", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}], "solar_water_heating": "N", "habitable_room_count": 3, "heating_cost_current": {"value": 719, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 2.2, "energy_rating_average": 60, "energy_rating_current": 69, "lighting_cost_current": {"value": 65, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 634, 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"low_energy_fixed_lighting_bulbs_count": 20, "incandescent_fixed_lighting_bulbs_count": 5}
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"wall_insulation_type": 3, "construction_age_band": "B", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "150mm", "wall_insulation_thickness": "50mm", "floor_insulation_thickness": "NI"}], "solar_water_heating": "Y", "habitable_room_count": 5, "heating_cost_current": {"value": 1093, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 3.3, "energy_rating_average": 60, "energy_rating_current": 69, "lighting_cost_current": {"value": 61, "currency": "GBP"}, "main_heating_controls": [{"description": "Time and temperature zone control", "energy_efficiency_rating": 5, "environmental_efficiency_rating": 5}], "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 895, "currency": "GBP"}, "hot_water_cost_current": {"value": 224, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 55, 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"true", "glazing_gap": "16+", "orientation": 8, "window_type": 1, "glazing_type": 1, "window_width": 0.9, "window_height": 1, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Top-floor flat", "language_code": 1, "pressure_test": 4, "property_type": 2, "address_line_1": "Flat 3", "address_line_2": "Elkan Court 29b", "address_line_3": "Dollis Park", "assessment_type": "RdSAP", "completion_date": "2026-04-15", "inspection_date": "2026-04-15", "extensions_count": 0, "measurement_type": 1, "sap_flat_details": {"level": 3, 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{"description": "Portable electric heaters (assumed)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "extract_fans_count": 2, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 195, "floor_heat_loss": 6, "roof_construction": 3, "wall_construction": 4, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.33, "quantity": "metres"}, "total_floor_area": {"value": 42, "quantity": "square metres"}, "party_wall_length": {"value": 14, "quantity": "metres"}, "heat_loss_perimeter": {"value": 12, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "G", "party_wall_construction": 3, "wall_thickness_measured": "Y", "roof_insulation_location": "ND", "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 1, "heating_cost_current": {"value": 279, "currency": "GBP"}, "insulated_door_count": 0, 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"permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 0.5, "window_height": 1, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Mid-terrace house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "28 Bethune Avenue", "assessment_type": "RdSAP", "completion_date": "2026-04-28", "inspection_date": "2026-04-27", "extensions_count": 0, "measurement_type": 2, "total_floor_area": 63, "transaction_type": 1, "conservatory_type": 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15, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.3, "quantity": "metres"}, "total_floor_area": {"value": 37.5, "quantity": "square metres"}, "party_wall_length": {"value": 10, "quantity": "metres"}, "heat_loss_perimeter": {"value": 15, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "C", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 5, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 4, "heating_cost_current": {"value": 925, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 2.9, "energy_rating_average": 60, "energy_rating_current": 67, "lighting_cost_current": {"value": 78, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], 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"environmental_efficiency_rating": 4}, "post_town": "SALISBURY", "built_form": "NR", "created_at": "2026-04-28 18:54:22", "door_count": 1, "region_code": 12, "report_type": 2, "sap_heating": {"number_baths": 1, "cylinder_size": 1, "shower_outlets": [{"shower_outlet": {"shower_wwhrs": 1, "shower_outlet_type": 1}}], "number_baths_wwhrs": 0, "water_heating_code": 901, "water_heating_fuel": 26, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2106, "main_heating_category": 2, "main_heating_fraction": 1, "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 17511}], "immersion_heating_type": "NA", "has_fixed_air_conditioning": "false"}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "glazing_gap": 12, "orientation": 7, "window_type": 1, "glazing_type": 3, "window_width": 1.2, 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"permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": 12, "orientation": 3, "window_type": 1, "glazing_type": 3, "window_width": 1.2, "window_height": 1, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": 12, "orientation": 3, "window_type": 1, "glazing_type": 3, "window_width": 1.79, "window_height": 1.2, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Mid-floor flat", "language_code": 1, "pressure_test": 4, "property_type": 2, "address_line_1": "15 Cleveland Flats", "address_line_2": "Fair View Road", "assessment_type": "RdSAP", "completion_date": "2026-04-28", "inspection_date": "2026-04-28", "extensions_count": 0, "measurement_type": 1, "sap_flat_details": {"level": 2, "top_storey": "N", "storey_count": 3, "flat_location": 1, "heat_loss_corridor": 3, "unheated_corridor_length": 7}, "total_floor_area": 59, "transaction_type": 8, "conservatory_type": 1, "has_draught_lobby": "true", "heated_room_count": 3, "registration_date": "2026-04-28", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "true", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "true"}, "secondary_heating": {"description": "None", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "extract_fans_count": 2, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 280, "floor_heat_loss": 6, "roof_construction": 3, "wall_construction": 4, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.38, "quantity": "metres"}, "total_floor_area": {"value": 58.56, "quantity": "square metres"}, "party_wall_length": {"value": 10.23, "quantity": "metres"}, "heat_loss_perimeter": {"value": 15.4, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "F", "sap_alternative_wall_1": {"wall_area": 16.66, "sheltered_wall": "Y", "wall_dry_lined": "N", "wall_thickness": 250, "wall_construction": 3, "wall_insulation_type": 4, "wall_thickness_measured": "Y", "wall_insulation_thickness": "NI"}, "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": "ND", "roof_insulation_thickness": "ND", "wall_insulation_thickness": 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"permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": 12, "orientation": 3, "window_type": 1, "glazing_type": 3, "window_width": 1.34, "window_height": 1.14, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Address Matched", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, oil", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Detached bungalow", "language_code": 1, "pressure_test": 4, "property_type": 1, "address_line_1": "Rowan", "address_line_2": "Main Road", "address_line_3": "Covenham St Bartholomew", "assessment_type": "RdSAP", "completion_date": "2026-05-09", "inspection_date": "2026-04-15", "extensions_count": 0, "measurement_type": 1, "total_floor_area": 82, "transaction_type": 8, "conservatory_type": 1, "heated_room_count": 4, "registration_date": "2026-05-09", "sap_energy_source": {"mains_gas": "N", "meter_type": 2, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "true"}, "secondary_heating": {"description": "None", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "extract_fans_count": 2, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 280, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 4, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.31, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 81.64, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 46.58, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "G", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "250mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 4, "heating_cost_current": {"value": 934, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 4.8, "energy_rating_average": 60, "energy_rating_current": 58, "lighting_cost_current": {"value": 58, "currency": "GBP"}, "main_heating_controls": [{"description": "Room thermostat and TRVs", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 785, "currency": "GBP"}, "hot_water_cost_current": {"value": 216, "currency": "GBP"}, 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"incandescent_fixed_lighting_bulbs_count": 0}
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"party_wall_length": {"value": 16.2, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 9.6, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.4, "quantity": "metres"}, "total_floor_area": {"value": 38.88, "quantity": "square metres"}, "party_wall_length": {"value": 16.2, "quantity": "metres"}, "heat_loss_perimeter": {"value": 9.6, "quantity": "metres"}}, {"floor": 2, "room_height": {"value": 2.4, "quantity": "metres"}, "total_floor_area": {"value": 38.88, "quantity": "square metres"}, "party_wall_length": {"value": 16.2, "quantity": "metres"}, "heat_loss_perimeter": {"value": 9.6, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "E", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": 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"party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 25.66, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.3, "quantity": "metres"}, "total_floor_area": {"value": 40.37, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "heat_loss_perimeter": {"value": 25.66, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "E", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "300mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 4, "heating_cost_current": {"value": 877, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 2.7, "energy_rating_average": 60, "energy_rating_current": 67, "lighting_cost_current": {"value": 57, "currency": "GBP"}, "main_heating_controls": [{"description": 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"incandescent_fixed_lighting_bulbs_count": 0}
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{"value": 2.54, "quantity": "metres"}, "total_floor_area": {"value": 26.08, "quantity": "square metres"}, "party_wall_length": {"value": 7.55, "quantity": "metres"}, "heat_loss_perimeter": {"value": 10.5, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "A", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.32, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 11.8, "quantity": "square metres"}, "party_wall_length": {"value": 4.52, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 7.13, "quantity": "metres"}}], 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"potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 33, "incandescent_fixed_lighting_bulbs_count": 0}
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"low_energy_fixed_lighting_bulbs_count": 10, "incandescent_fixed_lighting_bulbs_count": 0}
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"incandescent_fixed_lighting_bulbs_count": 0}
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"is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 1, "electricity_smart_meter_present": "false"}, "secondary_heating": {"description": "None", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 390, "floor_heat_loss": 6, "roof_construction": 3, "wall_construction": 8, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.44, "quantity": "metres"}, "total_floor_area": {"value": 74.1, "quantity": "square metres"}, "party_wall_length": {"value": 31.34, "quantity": "metres"}, "heat_loss_perimeter": {"value": 7.54, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "L", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": "ND", "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 3, "heating_cost_current": {"value": 173, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 1.3, "energy_rating_average": 60, "energy_rating_current": 82, "lighting_cost_current": {"value": 49, "currency": "GBP"}, "main_heating_controls": [{"description": "Charging system linked to use of community heating, programmer and at least two room thermostats", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 173, "currency": "GBP"}, "hot_water_cost_current": {"value": 281, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "co2_emissions_potential": 1.3, "energy_rating_potential": 82, "lighting_cost_potential": {"value": 49, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 281, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2559.18, "space_heating_existing_dwelling": 593.08}, "draughtproofed_door_count": 0, "energy_consumption_current": 95, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 95, "environmental_impact_current": 84, "current_energy_efficiency_band": "B", "environmental_impact_potential": 84, "led_fixed_lighting_bulbs_count": 30, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "B", "co2_emissions_current_per_floor_area": 17, "incandescent_fixed_lighting_bulbs_count": 0}
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"glazing_type": 4, "window_width": 1.32, "window_height": 1.08, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 5, "window_type": 1, "glazing_type": 4, "window_width": 0.71, "window_height": 0.58, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 3, "window_type": 1, "glazing_type": 4, "window_width": 0.64, "window_height": 1.09, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 1, "window_type": 1, "glazing_type": 4, "window_width": 0.9, "window_height": 1, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 1, "window_type": 1, "glazing_type": 4, 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"uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Room heaters, electric", "energy_efficiency_rating": 1, "environmental_efficiency_rating": 5}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Detached house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "Abbey Cottage", "address_line_2": "Sawley", "assessment_type": "RdSAP", "completion_date": "2026-05-15", "inspection_date": "2026-04-24", "extensions_count": 1, "measurement_type": 1, "total_floor_area": 185, "transaction_type": 1, "conservatory_type": 1, "has_draught_lobby": "true", "heated_room_count": 4, "other_flues_count": 1, "registration_date": "2026-05-15", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "false"}, "secondary_heating": {"description": "Room heaters, mains gas", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "closed_flues_count": 1, "extract_fans_count": 3, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 500, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 2, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.24, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 85.45, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 49.5, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.24, "quantity": "metres"}, "total_floor_area": {"value": 79.76, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "heat_loss_perimeter": {"value": 41.64, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "A", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "200mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 500, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 2, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.67, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 19.36, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 15.63, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "A", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 5, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 7803, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 8.8, "energy_rating_average": 60, "energy_rating_current": 11, "lighting_cost_current": {"value": 157, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer and appliance thermostats", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 1525, "currency": "GBP"}, "hot_water_cost_current": {"value": 665, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 344, "currency": "GBP"}, "indicative_cost": "\u00a3900 - \u00a31,200", "improvement_type": "A", "improvement_details": 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{"pvc_frame": "true", "glazing_gap": "16+", "orientation": 7, "window_type": 1, "glazing_type": 3, "window_width": 1.8, "window_height": 2.12, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 5, "window_type": 1, "glazing_type": 3, "window_width": 0.42, "window_height": 0.4, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 7, "window_type": 1, "glazing_type": 3, "window_width": 2.35, "window_height": 1, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler 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{"value": 2.34, "quantity": "metres"}, "total_floor_area": {"value": 24.12, "quantity": "square metres"}, "party_wall_length": {"value": 10.65, "quantity": "metres"}, "heat_loss_perimeter": {"value": 9.82, "quantity": "metres"}}, {"floor": 2, "room_height": {"value": 2.33, "quantity": "metres"}, "total_floor_area": {"value": 24.16, "quantity": "square metres"}, "party_wall_length": {"value": 10.65, "quantity": "metres"}, "heat_loss_perimeter": {"value": 9.87, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "G", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "250mm", "wall_insulation_thickness": "NI"}], "boilers_flues_count": 0, "open_chimneys_count": 0, "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 761, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 0.9, "energy_rating_average": 60, "energy_rating_current": 70, 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"energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Mid-floor flat", "language_code": 1, "pressure_test": 4, "property_type": 2, "address_line_1": "49 Streamside Close", "assessment_type": "RdSAP", "completion_date": "2026-05-15", "inspection_date": "2026-05-07", "extensions_count": 0, "measurement_type": 1, "sap_flat_details": {"level": 2, "top_storey": "N", "storey_count": 3, "flat_location": 1, "heat_loss_corridor": 0}, "total_floor_area": 34, "transaction_type": 8, "conservatory_type": 1, "heated_room_count": 0, "registration_date": "2026-05-15", "sap_energy_source": {"mains_gas": "N", "meter_type": 2, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "true"}, "secondary_heating": {"description": "Portable electric heaters (assumed)", 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"lighting_cost_current": {"value": 25, "currency": "GBP"}, "main_heating_controls": [{"description": "None", "energy_efficiency_rating": 1, "environmental_efficiency_rating": 1}], "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 192, "currency": "GBP"}, "hot_water_cost_current": {"value": 479, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 0, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 32, "currency": "GBP"}, "indicative_cost": "\u00a3150 - \u00a3250", "improvement_type": "D", "improvement_details": {"improvement_number": 10}, "improvement_category": 5, "energy_performance_rating": 60, "environmental_impact_rating": 90}, {"sequence": 2, "typical_saving": {"value": 391, "currency": "GBP"}, "indicative_cost": "\u00a3800 - \u00a31,600", "improvement_type": "L2", "improvement_details": {"improvement_number": 61}, "improvement_category": 5, "energy_performance_rating": 79, "environmental_impact_rating": 91}, {"sequence": 3, "typical_saving": {"value": 95, "currency": "GBP"}, "indicative_cost": "\u00a34,500 - \u00a36,000", "improvement_type": "O", "improvement_details": {"improvement_number": 8}, "improvement_category": 5, "energy_performance_rating": 82, "environmental_impact_rating": 92}], "co2_emissions_potential": 0.4, "energy_rating_potential": 82, "lighting_cost_potential": {"value": 29, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 290, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 1732.76, "space_heating_existing_dwelling": 1896.69}, "draughtproofed_door_count": 0, "energy_consumption_current": 169, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 0, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 132, "environmental_impact_current": 89, "current_energy_efficiency_band": "D", "environmental_impact_potential": 92, "led_fixed_lighting_bulbs_count": 5, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "B", "co2_emissions_current_per_floor_area": 16, "incandescent_fixed_lighting_bulbs_count": 0}
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"main_heating_fraction": 1, "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 16839}], "immersion_heating_type": "NA", "secondary_heating_type": 605, "has_fixed_air_conditioning": "false"}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 2, "window_width": 0.49, "window_height": 1.64, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 2, "window_width": 0.49, "window_height": 1.64, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 2, "window_width": 0.49, "window_height": 1.64, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, 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"permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 2, "window_width": 1.7, "window_height": 1.63, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 2, "glazing_type": 2, "window_width": 0.53, "window_height": 0.97, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Semi-detached house", "language_code": 1, 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"roof_insulation_location": 2, "roof_insulation_thickness": "350mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 130, "floor_heat_loss": 7, "sap_room_in_roof": {"floor_area": 8.34, "room_in_roof_type_1": {"gable_wall_type_1": 1, "gable_wall_type_2": 2, "gable_wall_length_1": 3.46, "gable_wall_length_2": 3.46}, "construction_age_band": "J"}, "roof_construction": 4, "wall_construction": 5, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.5, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 8.34, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 8.28, "quantity": "metres"}}], "wall_insulation_type": 3, "construction_age_band": "J", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "350mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 1600, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 4.8, "energy_rating_average": 60, "energy_rating_current": 67, "lighting_cost_current": {"value": 61, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 1291, "currency": "GBP"}, "hot_water_cost_current": {"value": 203, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 187, "currency": "GBP"}, "indicative_cost": "\u00a37,500 - \u00a311,000", "improvement_type": "Q", "improvement_details": {"improvement_number": 7}, "improvement_category": 5, "energy_performance_rating": 70, "environmental_impact_rating": 68}, {"sequence": 2, "typical_saving": {"value": 121, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W1", "improvement_details": {"improvement_number": 57}, "improvement_category": 5, "energy_performance_rating": 72, "environmental_impact_rating": 71}, {"sequence": 3, "typical_saving": {"value": 204, "currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 77, "environmental_impact_rating": 72}], "co2_emissions_potential": 3.8, "energy_rating_potential": 77, "lighting_cost_potential": {"value": 61, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 203, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2446.31, "space_heating_existing_dwelling": 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"incandescent_fixed_lighting_bulbs_count": 2}
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"typical_saving": {"value": 75, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W2", "improvement_details": {"improvement_number": 58}, "improvement_category": 5, "energy_performance_rating": 59, "environmental_impact_rating": 87}, {"sequence": 3, "typical_saving": {"value": 399, "currency": "GBP"}, "indicative_cost": "\u00a3800 - \u00a31,600", "improvement_type": "L2", "improvement_details": {"improvement_number": 61}, "improvement_category": 5, "energy_performance_rating": 73, "environmental_impact_rating": 88}, {"sequence": 4, "typical_saving": {"value": 48, "currency": "GBP"}, "indicative_cost": "\u00a31,800 - \u00a32,400", "improvement_type": "X", "improvement_details": {"improvement_number": 48}, "improvement_category": 5, "energy_performance_rating": 74, "environmental_impact_rating": 88}, {"sequence": 5, "typical_saving": {"value": 216, "currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", 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"environmental_impact_rating": 76}, {"sequence": 3, "typical_saving": 33, "indicative_cost": "\u00a3600 - \u00a31,500", "improvement_type": "Y", "improvement_details": {"improvement_number": 49}, "improvement_category": 5, "energy_performance_rating": 76, "environmental_impact_rating": 77}, {"sequence": 4, "typical_saving": 134, "indicative_cost": "\u00a34,500 - \u00a36,000", "improvement_type": "O", "improvement_details": {"improvement_number": 8}, "improvement_category": 5, "energy_performance_rating": 82, "environmental_impact_rating": 86}], "co2_emissions_potential": 0.9, "energy_rating_potential": 82, "lighting_cost_potential": {"value": 29, "currency": "GBP"}, "schema_version_original": "LIG-21.0", "hot_water_cost_potential": {"value": 178, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2001.53, "space_heating_existing_dwelling": 2965.58}, "draughtproofed_door_count": 0, "energy_consumption_current": 228, "has_fixed_air_conditioning": "false", 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"N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 2, "window_width": 1.63, "window_height": 1.18, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "WLS", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Semi-detached bungalow", "language_code": 1, "pressure_test": 4, "property_type": 1, "address_line_1": "9 Powis Close", "address_line_2": "Grove Park", "assessment_type": "RdSAP", "completion_date": "2026-05-15", "inspection_date": "2026-05-15", "extensions_count": 0, "measurement_type": 1, "total_floor_area": 51, 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"currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W1", "improvement_details": {"improvement_number": 57}, "improvement_category": 5, "energy_performance_rating": 71, "environmental_impact_rating": 71}, {"sequence": 2, "typical_saving": {"value": 192, "currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 76, "environmental_impact_rating": 72}], "co2_emissions_potential": 2.5, "energy_rating_potential": 76, "lighting_cost_potential": {"value": 52, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 233, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2685.13, "space_heating_existing_dwelling": 8773.81}, "draughtproofed_door_count": 2, "energy_consumption_current": 214, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, 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"party_wall_length": {"value": 22.59, "quantity": "metres"}, "heat_loss_perimeter": {"value": 21.33, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "I", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "100mm", "wall_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 3, "heating_cost_current": {"value": 707, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 0.9, "energy_rating_average": 60, "energy_rating_current": 75, "lighting_cost_current": {"value": 74, "currency": "GBP"}, "main_heating_controls": [{"description": "Controls for high heat retention storage heaters", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 557, "currency": "GBP"}, "hot_water_cost_current": {"value": 431, "currency": "GBP"}, "mechanical_ventilation": 0, 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"incandescent_fixed_lighting_bulbs_count": 11}
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"low_energy_fixed_lighting_bulbs_count": 15, "incandescent_fixed_lighting_bulbs_count": 0}
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"energy_rating_current": 59, "lighting_cost_current": {"value": 134, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer and room thermostat", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 1217, "currency": "GBP"}, "hot_water_cost_current": {"value": 221, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 104, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W2", "improvement_details": {"improvement_number": 58}, "improvement_category": 5, "energy_performance_rating": 61, "environmental_impact_rating": 64}, {"sequence": 2, "typical_saving": {"value": 71, "currency": "GBP"}, "indicative_cost": "\u00a3510 - \u00a3595", "improvement_type": "E", "improvement_details": {"improvement_number": 35}, "improvement_category": 5, 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"Below average lighting efficiency", "energy_efficiency_rating": 2, "environmental_efficiency_rating": 2}, "postcode": "WN3 4TB", "hot_water": {"description": "From main system", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "WIGAN", "built_form": 3, "created_at": "2026-05-15 11:39:58", "door_count": 2, "region_code": 19, "report_type": 2, "sap_heating": {"number_baths": 1, "cylinder_size": 3, "shower_outlets": [{"shower_wwhrs": 1, "shower_outlet_type": 2}], "number_baths_wwhrs": 0, "water_heating_code": 914, "water_heating_fuel": 26, "cylinder_thermostat": "Y", "secondary_fuel_type": 26, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2106, "main_heating_category": 2, "main_heating_fraction": 1, "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 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"incandescent_fixed_lighting_bulbs_count": 0}
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"orientation": 8, "window_type": 1, "glazing_type": 3, "window_width": 0.9, "window_height": 0.9, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": 12, "orientation": 6, "window_type": 1, "glazing_type": 3, "window_width": 1.7, "window_height": 0.9, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": 12, "orientation": 6, "window_type": 1, "glazing_type": 3, "window_width": 1.7, "window_height": 0.9, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": 12, "orientation": 4, "window_type": 1, "glazing_type": 3, "window_width": 1.2, "window_height": 1.2, "draught_proofed": "true", "window_location": 0, 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"orientation": 6, "window_type": 1, "glazing_type": 1, "window_width": 1.7, "window_height": 0.9, "draught_proofed": "true", "window_location": 4, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 4, "window_type": 1, "glazing_type": 1, "window_width": 0.9, "window_height": 0.9, "draught_proofed": "true", "window_location": 3, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 4, "window_type": 1, "glazing_type": 1, "window_width": 0.9, "window_height": 0.9, "draught_proofed": "true", "window_location": 3, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 2, "window_type": 2, "glazing_type": 1, "window_width": 0.7, "window_height": 0.9, "draught_proofed": "true", "window_location": 3, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 2, "window_type": 2, "glazing_type": 1, "window_width": 0.7, "window_height": 0.9, "draught_proofed": "true", "window_location": 3, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 4, "window_type": 2, "glazing_type": 3, "window_width": 2.4, "window_height": 1.8, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": 12, "orientation": 6, "window_type": 2, "glazing_type": 3, "window_width": 0.5, "window_height": 0.9, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": 12, "orientation": 6, "window_type": 2, "glazing_type": 3, "window_width": 0.5, "window_height": 0.9, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, {"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Detached house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "31 Whirlow Lane", "assessment_type": "RdSAP", "completion_date": "2026-05-14", "inspection_date": "2026-05-12", "extensions_count": 4, "measurement_type": 1, "total_floor_area": 331, "transaction_type": 1, "conservatory_type": 1, "has_draught_lobby": "true", "heated_room_count": 10, "registration_date": "2026-05-14", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "pv_diverter": "true", "pv_connection": 2, "photovoltaic_supply": [[{"pitch": 3, "peak_power": 1.75, "orientation": 4, "overshading": 1}], [{"pitch": 3, "peak_power": 1.25, "orientation": 6, "overshading": 1}]], "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "false"}, "secondary_heating": {"description": "Room heaters, dual fuel (mineral and wood)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "closed_flues_count": 1, "extract_fans_count": 3, "lzc_energy_sources": [11], "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 500, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 2, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.74, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 114.47, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 41.24, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.72, "quantity": "metres"}, "total_floor_area": {"value": 103.45, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "heat_loss_perimeter": {"value": 43.7, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "A", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 5, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 2, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.65, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 30.04, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 13.41, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "F", "party_wall_construction": "NA", "wall_thickness_measured": "N", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}, {"identifier": "Extension 2", "wall_dry_lined": "N", "wall_thickness": 500, "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 2, "building_part_number": 3, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.31, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 19.66, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 12.65, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "A", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}, {"identifier": "Extension 3", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 5, "wall_construction": 4, "building_part_number": 4, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.39, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 13.8, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 11.25, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.3, "quantity": "metres"}, "total_floor_area": {"value": 13.8, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "heat_loss_perimeter": {"value": 10.6, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "I", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 5, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 4", "wall_dry_lined": "N", "floor_heat_loss": 2, "roof_construction": 5, "wall_construction": 4, "building_part_number": 5, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.3, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 36, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 18, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "I", 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"indicative_cost": "\u00a320 - \u00a340", "improvement_type": "C", "improvement_details": {"improvement_number": 3}, "improvement_category": 5, "energy_performance_rating": 72, "environmental_impact_rating": 84}, {"sequence": 3, "typical_saving": {"value": 30, "currency": "GBP"}, "indicative_cost": "\u00a31,800 - \u00a32,400", "improvement_type": "X", "improvement_details": {"improvement_number": 48}, "improvement_category": 5, "energy_performance_rating": 73, "environmental_impact_rating": 84}], "co2_emissions_potential": 1.1, "energy_rating_potential": 73, "lighting_cost_potential": {"value": 45, "currency": "GBP"}, "schema_version_original": "21.0.1", "alternative_improvements": [{"sequence": 1, "typical_saving": {"value": 29, "currency": "GBP"}, "improvement_type": "Q2", "improvement_details": {"improvement_number": 55}, "improvement_category": 6, "energy_performance_rating": 73, "environmental_impact_rating": 83}], "hot_water_cost_potential": {"value": 248, "currency": "GBP"}, 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"incandescent_fixed_lighting_bulbs_count": 10}
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{"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "true", "is_hydro_output_connected_to_dwelling_meter": "false"}, "secondary_heating": {"description": "Room heaters, dual fuel (mineral and wood)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "closed_flues_count": 0, "extract_fans_count": 1, "sap_building_parts": [{"floor_area": {"value": 15.34, "quantity": "square metres"}, "room_height": 1, "double_glazed": "Y", "glazed_perimeter": {"value": 11.11, "quantity": "metres"}}, {"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 500, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 2, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.31, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 53.42, "quantity": "square 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"incandescent_fixed_lighting_bulbs_count": 0}
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"incandescent_fixed_lighting_bulbs_count": 0}
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"pressure_test": 4, "property_type": 0, "address_line_1": "120 Norwich Road", "assessment_type": "RdSAP", "completion_date": "2026-05-14", "inspection_date": "2026-05-12", "extensions_count": 2, "measurement_type": 1, "total_floor_area": 178, "transaction_type": 1, "conservatory_type": 1, "has_draught_lobby": "true", "heated_room_count": 7, "registration_date": "2026-05-14", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "pv_batteries": [{"battery_capacity": 5}, {"battery_capacity": 5}], "pv_connection": 2, "pv_battery_count": 2, "photovoltaic_supply": {"pv_arrays": [{"pitch": 3, "peak_power": 3.5, "orientation": 5, "overshading": 1}]}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "true", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "true"}, "secondary_heating": {"description": "Room heaters, dual fuel (mineral and wood)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, 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"roof_insulation_location": 2, "roof_insulation_thickness": "200mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.35, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 27.19, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 14.75, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "G", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "300mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 2", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 4, "building_part_number": 3, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.35, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 11.59, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 10.51, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "I", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "125mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 7, "heating_cost_current": {"value": 1894, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 4.8, "energy_rating_average": 60, "energy_rating_current": 79, "lighting_cost_current": {"value": 80, "currency": "GBP"}, "main_heating_controls": 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"permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 1.18, "window_height": 1.01, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 5, "window_type": 1, "glazing_type": 2, "window_width": 0.88, "window_height": 0.86, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 5, "window_type": 1, "glazing_type": 2, "window_width": 0.88, "window_height": 0.86, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains 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"is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "true"}, "secondary_heating": {"description": "None", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "extract_fans_count": 2, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 6, "roof_construction": 4, "wall_construction": 4, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.5, "quantity": "metres"}, "total_floor_area": {"value": 47.54, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "heat_loss_perimeter": {"value": 27.58, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "H", "sap_alternative_wall_1": {"wall_area": 14.8, "sheltered_wall": "Y", "wall_dry_lined": "N", "wall_thickness": 290, "wall_construction": 4, "wall_insulation_type": 4, "wall_thickness_measured": "Y", 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{"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "false"}, "secondary_heating": {"description": "None", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 3, "wall_construction": 4, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.41, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 54.88, "quantity": "square metres"}, "party_wall_length": {"value": 14.83, "quantity": "metres"}, "floor_construction": 0, "heat_loss_perimeter": {"value": 13.37, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "G", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 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"has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "E", "co2_emissions_current_per_floor_area": 13, "incandescent_fixed_lighting_bulbs_count": 0}
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{"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "true"}, "secondary_heating": {"description": "None", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "closed_flues_count": 0, "extract_fans_count": 0, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 330, "floor_heat_loss": 6, "roof_construction": 3, "wall_construction": 8, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": 2.55, "floor_insulation": 0, "total_floor_area": 58.06, "party_wall_length": 22.2, "floor_construction": 0, "heat_loss_perimeter": 8.44}], "wall_insulation_type": 4, "construction_age_band": "K", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": "ND", "roof_insulation_thickness": "ND", "wall_insulation_thickness": 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"is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "false"}, "secondary_heating": {"description": "Room heaters, dual fuel (mineral and wood)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "closed_flues_count": 1, "extract_fans_count": 1, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 280, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 4, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.73, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 36, "quantity": "square metres"}, "party_wall_length": {"value": 6.67, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 18.31, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.71, "quantity": "metres"}, "total_floor_area": {"value": 34.68, "quantity": "square metres"}, "party_wall_length": {"value": 6.67, "quantity": "metres"}, "heat_loss_perimeter": {"value": 17.07, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "150mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 1131, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 3.1, "energy_rating_average": 60, "energy_rating_current": 63, "lighting_cost_current": {"value": 115, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 804, "currency": "GBP"}, "hot_water_cost_current": {"value": 191, "currency": "GBP"}, "mechanical_ventilation": 0, 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"low_energy_fixed_lighting_bulbs_count": 4, "incandescent_fixed_lighting_bulbs_count": 2}
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"low_energy_fixed_lighting_bulbs_count": 16, "incandescent_fixed_lighting_bulbs_count": 0}
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"permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 3, "window_type": 1, "glazing_type": 3, "window_width": 1, "window_height": 1.4, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 7, "window_type": 1, "glazing_type": 3, "window_width": 1, "window_height": 1.4, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 7, "window_type": 1, "glazing_type": 3, "window_width": 1, "window_height": 1.4, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 7, 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"typical_saving": {"value": 194, "currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 81, "environmental_impact_rating": 79}], "co2_emissions_potential": 2.0, "energy_rating_potential": 81, "lighting_cost_potential": {"value": 57, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 210, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2406.89, "space_heating_existing_dwelling": 5832.24}, "draughtproofed_door_count": 2, "energy_consumption_current": 163, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 138, "environmental_impact_current": 76, "current_energy_efficiency_band": "C", "environmental_impact_potential": 79, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "B", "co2_emissions_current_per_floor_area": 30, "low_energy_fixed_lighting_bulbs_count": 15, "incandescent_fixed_lighting_bulbs_count": 0}
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2, "sap_heating": {"number_baths": 1, "cylinder_size": 1, "shower_outlets": [{"shower_wwhrs": 1, "shower_outlet_type": 1}], "water_heating_code": 901, "water_heating_fuel": 26, "secondary_fuel_type": 0, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2106, "main_heating_category": 2, "main_heating_fraction": 1, "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 17117}], "immersion_heating_type": "NA", "has_fixed_air_conditioning": "false"}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 1.47, "window_height": 1.18, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 0.99, "window_height": 1.19, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 5, "window_type": 1, "glazing_type": 2, "window_width": 2.22, "window_height": 1.18, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Ground-floor flat", "language_code": 1, "pressure_test": 4, "property_type": 2, "address_line_1": "10 Westbury Court", 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0}, "closed_flues_count": 0, "extract_fans_count": 0, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 3, "wall_construction": 3, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.49, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 27.21, "quantity": "square metres"}, "party_wall_length": {"value": 12.39, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 9.22, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "E", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": "ND", "roof_insulation_thickness": "ND"}], "boilers_flues_count": 1, "open_chimneys_count": 0, "solar_water_heating": "N", "habitable_room_count": 1, "heating_cost_current": {"value": 368, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 1, "energy_rating_average": 60, "energy_rating_current": 72, "lighting_cost_current": {"value": 20, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "blocked_chimneys_count": 1, "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 274, "currency": "GBP"}, "hot_water_cost_current": {"value": 135, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": 63, "indicative_cost": "\u00a37,500 - \u00a311,000", "improvement_type": "Q", "improvement_details": {"improvement_number": 7}, "improvement_category": 5, "energy_performance_rating": 75, "environmental_impact_rating": 82}, {"sequence": 2, "typical_saving": 30, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W2", "improvement_details": {"improvement_number": 58}, "improvement_category": 5, "energy_performance_rating": 76, "environmental_impact_rating": 83}], "co2_emissions_potential": 0.8, "energy_rating_potential": 76, "lighting_cost_potential": {"value": 20, "currency": "GBP"}, "schema_version_original": "LIG-21.0.1", "flueless_gas_fires_count": 0, "hot_water_cost_potential": {"value": 135, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 1631.38, "space_heating_existing_dwelling": 2623.47}, "draughtproofed_door_count": 1, "energy_consumption_current": 212, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "4.3.74", "energy_consumption_potential": 158, "environmental_impact_current": 78, "cfl_fixed_lighting_bulbs_count": 0, "current_energy_efficiency_band": "C", "environmental_impact_potential": 83, "led_fixed_lighting_bulbs_count": 4, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 38, "incandescent_fixed_lighting_bulbs_count": 0}
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"draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 8, "window_type": 1, "glazing_type": 5, "window_width": 1.06, "window_height": 1.66, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 8, "window_type": 1, "glazing_type": 5, "window_width": 1.06, "window_height": 1.66, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 4, "window_type": 1, "glazing_type": 5, "window_width": 1.1, "window_height": 1.3, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 4, 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{"description": "None", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 240, "floor_heat_loss": 3, "roof_construction": 4, "wall_construction": 3, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.54, "quantity": "metres"}, "total_floor_area": {"value": 51.15, "quantity": "square metres"}, "party_wall_length": {"value": 20.42, "quantity": "metres"}, "heat_loss_perimeter": {"value": 10.02, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.28, "quantity": "metres"}, "total_floor_area": {"value": 50.74, "quantity": "square metres"}, "party_wall_length": {"value": 20.42, "quantity": "metres"}, "heat_loss_perimeter": {"value": 9.94, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "A", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 2, 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"typical_saving": {"value": 231, "currency": "GBP"}, "indicative_cost": "\u00a32,200 - \u00a33,500", "improvement_type": "I", "improvement_details": {"improvement_number": 20}, "improvement_category": 5, "energy_performance_rating": 69, "environmental_impact_rating": 66}, {"sequence": 3, "typical_saving": {"value": 277, "currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 71, "environmental_impact_rating": 67}, {"sequence": 4, "typical_saving": {"value": 693, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a320,000", "improvement_type": "V2", "improvement_details": {"improvement_number": 44}, "improvement_category": 5, "energy_performance_rating": 78, "environmental_impact_rating": 69}], "co2_emissions_potential": 5.7, "energy_rating_potential": 78, "lighting_cost_potential": {"value": 95, "currency": "GBP"}, 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"incandescent_fixed_lighting_bulbs_count": 0}
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"wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 728, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 2.5, "energy_rating_average": 60, "energy_rating_current": 71, "lighting_cost_current": {"value": 62, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 674, "currency": "GBP"}, "hot_water_cost_current": {"value": 256, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 54, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W2", "improvement_details": {"improvement_number": 58}, "improvement_category": 5, "energy_performance_rating": 72, "environmental_impact_rating": 74}, {"sequence": 2, "typical_saving": {"value": 230, "currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 77, "environmental_impact_rating": 75}], "co2_emissions_potential": 2.2, "energy_rating_potential": 77, "lighting_cost_potential": {"value": 62, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 256, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2384.95, "space_heating_existing_dwelling": 7421.92}, "draughtproofed_door_count": 1, "energy_consumption_current": 174, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0335", "energy_consumption_potential": 147, "environmental_impact_current": 72, "current_energy_efficiency_band": "C", 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"Excellent lighting efficiency", "energy_efficiency_rating": 5, "environmental_efficiency_rating": 5}, "postcode": "BS16 1SG", "hot_water": {"description": "From main system", "energy_efficiency_rating": 1, "environmental_efficiency_rating": 4}, "post_town": "BRISTOL", "built_form": 2, "created_at": "2026-03-27 17:28:17", "door_count": 1, "region_code": 12, "report_type": 2, "sap_heating": {"number_baths": 0, "cylinder_size": 1, "number_baths_wwhrs": 0, "water_heating_code": 901, "water_heating_fuel": 3, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 3, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2107, "main_heating_category": 2, "main_heating_fraction": 1, "sap_main_heating_code": 104, "central_heating_pump_age": 0, "main_heating_data_source": 2}], "immersion_heating_type": "NA", "has_fixed_air_conditioning": "false"}, "sap_version": 10.2, "sap_windows": 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"indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 54, "environmental_impact_rating": 76}], "co2_emissions_potential": 2.3, "energy_rating_potential": 54, "lighting_cost_potential": {"value": 71, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 331, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2560.45, "space_heating_existing_dwelling": 11034.65}, "draughtproofed_door_count": 1, "energy_consumption_current": 217, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0335", "energy_consumption_potential": 115, "environmental_impact_current": 58, "current_energy_efficiency_band": "F", "environmental_impact_potential": 76, "led_fixed_lighting_bulbs_count": 7, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": 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{"pvc_frame": "true", "glazing_gap": 12, "orientation": 5, "window_type": 2, "glazing_type": 1, "window_width": 0.8, "window_height": 0.9, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": 12, "orientation": 1, "window_type": 2, "glazing_type": 1, "window_width": 0.5, "window_height": 0.8, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Mid-terrace bungalow", "language_code": 1, "pressure_test": 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"draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 6, "window_type": 1, "glazing_type": 2, "window_width": 1.33, "window_height": 0.99, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Mid-floor flat", "language_code": 1, "pressure_test": 4, "property_type": 2, "address_line_1": "Flat 6", "address_line_2": "Boleyn Court", "address_line_3": "St. Annes Rise", "assessment_type": "RdSAP", 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"floor_heat_loss": 6, "roof_construction": 3, "wall_construction": 4, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.34, "quantity": "metres"}, "total_floor_area": {"value": 65.5, "quantity": "square metres"}, "party_wall_length": {"value": 8.46, "quantity": "metres"}, "heat_loss_perimeter": {"value": 25.7, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "G", "sap_alternative_wall_1": {"wall_area": 10.6002, "sheltered_wall": "Y", "wall_dry_lined": "N", "wall_thickness": 340, "wall_construction": 4, "wall_insulation_type": 4, "wall_thickness_measured": "Y", "wall_insulation_thickness": "NI"}, "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": "ND", "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 3, "heating_cost_current": {"value": 328, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 1.3, "energy_rating_average": 60, "energy_rating_current": 80, "lighting_cost_current": {"value": 52, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 328, "currency": "GBP"}, "hot_water_cost_current": {"value": 211, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "co2_emissions_potential": 1.3, "energy_rating_potential": 80, "lighting_cost_potential": {"value": 52, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 211, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2656.4, "space_heating_existing_dwelling": 2228.06}, "draughtproofed_door_count": 1, "energy_consumption_current": 108, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, 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{"description": "Good lighting efficiency", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "postcode": "PE22 0LZ", "hot_water": {"description": "Electric immersion, standard tariff", "energy_efficiency_rating": 1, "environmental_efficiency_rating": 5}, "post_town": "BOSTON", "built_form": 1, "created_at": "2026-01-15 16:03:26", "door_count": 2, "region_code": 3, "report_type": 2, "sap_heating": {"number_baths": 1, "cylinder_size": 2, "shower_outlets": [{"shower_outlet": {"shower_wwhrs": 1, "shower_outlet_type": 2}}], "number_baths_wwhrs": 0, "water_heating_code": 903, "water_heating_fuel": 29, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 0, "heat_emitter_type": 0, "emitter_temperature": "NA", "main_heating_number": 1, "main_heating_control": 2699, "main_heating_category": 1, "main_heating_fraction": 1, "sap_main_heating_code": 699, "main_heating_data_source": 2}], "immersion_heating_type": 2, "cylinder_insulation_type": 1, 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"glazing_type": 2, "window_width": 1.16, "window_height": 1.46, "draught_proofed": "true", "window_location": 2, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": 12, "orientation": 1, "window_type": 1, "glazing_type": 3, "window_width": 1.8, "window_height": 1.23, "draught_proofed": "true", "window_location": 2, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 5, "window_width": 0.55, "window_height": 0.58, "draught_proofed": "false", "window_location": 2, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 2, "window_width": 1.69, "window_height": 0.98, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", 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"window_height": 0.98, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 6, "window_type": 1, "glazing_type": 2, "window_width": 0.43, "window_height": 0.8, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 6, "window_type": 1, "glazing_type": 2, "window_width": 1.03, "window_height": 1, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 8, "window_type": 1, "glazing_type": 2, "window_width": 1.04, "window_height": 0.98, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 8, "window_type": 1, "glazing_type": 2, "window_width": 0.5, "window_height": 0.93, "draught_proofed": "true", "window_location": 2, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 6, "window_type": 1, "glazing_type": 2, "window_width": 1.16, "window_height": 1, "draught_proofed": "true", "window_location": 2, "window_wall_type": 5, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 4, "window_type": 2, "glazing_type": 3, "window_width": 0.7, "window_height": 0.95, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 8, "window_type": 2, "glazing_type": 3, "window_width": 0.49, "window_height": 0.77, "draught_proofed": "true", "window_location": 0, 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"incandescent_fixed_lighting_bulbs_count": 0}
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"energy_rating_current": 62, "lighting_cost_current": {"value": 62, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 797, "currency": "GBP"}, "hot_water_cost_current": {"value": 212, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 543, "currency": "GBP"}, "indicative_cost": "\u00a37,500 - \u00a311,000", "improvement_type": "Q", "improvement_details": {"improvement_number": 7}, "improvement_category": 5, "energy_performance_rating": 72, "environmental_impact_rating": 71}, {"sequence": 2, "typical_saving": {"value": 121, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W1", "improvement_details": {"improvement_number": 57}, "improvement_category": 5, "energy_performance_rating": 75, "environmental_impact_rating": 75}, {"sequence": 3, "typical_saving": {"value": 217, "currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 79, "environmental_impact_rating": 76}], "co2_emissions_potential": 2.4, "energy_rating_potential": 79, "lighting_cost_potential": {"value": 62, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 212, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2560.23, "space_heating_existing_dwelling": 15816.69}, "draughtproofed_door_count": 2, "energy_consumption_current": 251, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 132, "environmental_impact_current": 56, "current_energy_efficiency_band": "D", 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"lighting": {"description": "Below average lighting efficiency", "energy_efficiency_rating": 2, "environmental_efficiency_rating": 2}, "postcode": "SW20 8TS", "hot_water": {"description": "From main system", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "LONDON", "built_form": 4, "created_at": "2026-05-20 16:23:10", "door_count": 1, "region_code": 17, "report_type": 2, "sap_heating": {"number_baths": 1, "cylinder_size": 1, "shower_outlets": [{"shower_wwhrs": 1, "shower_outlet_type": 1}, {"shower_wwhrs": 1, "shower_outlet_type": 1}, {"shower_wwhrs": 1, "shower_outlet_type": 1}], "number_baths_wwhrs": 0, "water_heating_code": 901, "water_heating_fuel": 26, "secondary_fuel_type": 26, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2106, "main_heating_category": 2, "main_heating_fraction": 1, "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 18833}], "immersion_heating_type": "NA", "secondary_heating_type": 612, "has_fixed_air_conditioning": "false"}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "orientation": 9, "window_type": 2, "glazing_type": 2, "window_width": 0.8, "window_height": 0.8, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 9, "window_type": 2, "glazing_type": 2, "window_width": 0.8, "window_height": 0.8, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 4, "window_type": 1, "glazing_type": 2, "window_width": 0.4, "window_height": 1, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 8, "window_type": 1, "glazing_type": 2, "window_width": 2, "window_height": 2, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 8, "window_type": 1, "glazing_type": 13, "window_width": 1.2, "window_height": 1, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 8, "window_type": 1, "glazing_type": 2, "window_width": 0.4, "window_height": 1.2, "draught_proofed": "true", "window_location": 0, "window_wall_type": 4, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 8, "window_type": 1, "glazing_type": 2, "window_width": 0.4, "window_height": 1.2, "draught_proofed": "true", "window_location": 0, "window_wall_type": 4, 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"window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 4, "window_type": 1, "glazing_type": 13, "window_width": 2, "window_height": 1.2, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Mid-terrace house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "22 Pendarves Road", "assessment_type": "RdSAP", "completion_date": "2026-05-20", "inspection_date": "2026-05-15", "extensions_count": 1, "measurement_type": 1, "total_floor_area": 133, "transaction_type": 1, "conservatory_type": 1, "heated_room_count": 5, "registration_date": "2026-05-20", "sap_energy_source": {"mains_gas": "Y", "meter_type": 3, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "true", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "true"}, "secondary_heating": {"description": "Room heaters, mains gas", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "extract_fans_count": 2, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 220, "floor_heat_loss": 7, "sap_room_in_roof": {"floor_area": 29.6, "room_in_roof_type_1": {"gable_wall_type_1": 1, "gable_wall_type_2": 2, "gable_wall_length_1": 6.46, "gable_wall_length_2": 6.46}, "construction_age_band": "K"}, "roof_construction": 4, "wall_construction": 3, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.7, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 44.18, "quantity": "square metres"}, "party_wall_length": {"value": 15.44, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 7.4, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.7, "quantity": "metres"}, "total_floor_area": {"value": 44.18, "quantity": "square metres"}, "party_wall_length": {"value": 15.44, "quantity": "metres"}, "heat_loss_perimeter": {"value": 12.8, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 5, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.7, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 14.63, "quantity": "square metres"}, "party_wall_length": {"value": 5.64, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 5.19, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "K", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "open_chimneys_count": 1, "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 1339, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 4.1, "energy_rating_average": 60, "energy_rating_current": 65, "lighting_cost_current": {"value": 140, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 920, "currency": "GBP"}, "hot_water_cost_current": {"value": 220, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 364, "currency": "GBP"}, "indicative_cost": "\u00a37,500 - \u00a311,000", "improvement_type": "Q", "improvement_details": {"improvement_number": 7}, "improvement_category": 5, "energy_performance_rating": 71, "environmental_impact_rating": 69}, {"sequence": 2, "typical_saving": {"value": 65, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W1", "improvement_details": {"improvement_number": 57}, "improvement_category": 5, "energy_performance_rating": 73, "environmental_impact_rating": 71}, {"sequence": 3, "typical_saving": {"value": 49, "currency": "GBP"}, "indicative_cost": "\u00a3300 - \u00a3350", "improvement_type": "E", "improvement_details": {"improvement_number": 35}, "improvement_category": 5, "energy_performance_rating": 74, "environmental_impact_rating": 71}, {"sequence": 4, "typical_saving": {"value": 237, "currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 77, "environmental_impact_rating": 72}], "co2_emissions_potential": 2.8, "energy_rating_potential": 77, "lighting_cost_potential": {"value": 79, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 220, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2606.15, "space_heating_existing_dwelling": 10732.23}, "draughtproofed_door_count": 1, "energy_consumption_current": 171, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 111, "environmental_impact_current": 60, "current_energy_efficiency_band": "D", "environmental_impact_potential": 72, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 31, "low_energy_fixed_lighting_bulbs_count": 10, "incandescent_fixed_lighting_bulbs_count": 10}
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"floor_insulation": 1, "total_floor_area": {"value": 25.38, "quantity": "square metres"}, "party_wall_length": {"value": 7.05, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 14.25, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.38, "quantity": "metres"}, "total_floor_area": {"value": 25.38, "quantity": "square metres"}, "party_wall_length": {"value": 14.1, "quantity": "metres"}, "heat_loss_perimeter": {"value": 7.2, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "H", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "150mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 3, "heating_cost_current": {"value": 1227, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 1.3, "energy_rating_average": 60, "energy_rating_current": 61, 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"environmental_impact_rating": 84}, {"sequence": 3, "typical_saving": {"value": 22, "currency": "GBP"}, "indicative_cost": "\u00a3150 - \u00a3250", "improvement_type": "D", "improvement_details": {"improvement_number": 10}, "improvement_category": 5, "energy_performance_rating": 65, "environmental_impact_rating": 85}, {"sequence": 4, "typical_saving": {"value": 403, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a330,000", "improvement_type": "Z1", "improvement_details": {"improvement_number": 51}, "improvement_category": 5, "energy_performance_rating": 72, "environmental_impact_rating": 93}, {"sequence": 5, "typical_saving": {"value": 39, "currency": "GBP"}, "indicative_cost": "\u00a31,800 - \u00a32,400", "improvement_type": "X", "improvement_details": {"improvement_number": 48}, "improvement_category": 5, "energy_performance_rating": 73, "environmental_impact_rating": 93}, {"sequence": 6, "typical_saving": {"value": 234, "currency": "GBP"}, "indicative_cost": "\u00a38,000 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{"value": 7.88, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 18.42, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.3, "quantity": "metres"}, "total_floor_area": {"value": 41.53, "quantity": "square metres"}, "party_wall_length": {"value": 7.88, "quantity": "metres"}, "heat_loss_perimeter": {"value": 18.42, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "L", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "200mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 4, "heating_cost_current": {"value": 608, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 2.0, "energy_rating_average": 60, "energy_rating_current": 77, "lighting_cost_current": {"value": 56, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer and room 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"energy_rating_average": 60, "energy_rating_current": 68, "lighting_cost_current": {"value": 31, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 289, "currency": "GBP"}, "hot_water_cost_current": {"value": 235, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 25, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 49, "currency": "GBP"}, "indicative_cost": "\u00a3900 - \u00a31,200", "improvement_type": "A2", "improvement_details": {"improvement_number": 45}, "improvement_category": 5, "energy_performance_rating": 69, "environmental_impact_rating": 78}, {"sequence": 2, "typical_saving": {"value": 72, "currency": "GBP"}, "indicative_cost": "\u00a37,500 - \u00a311,000", "improvement_type": "Q", "improvement_details": {"improvement_number": 7}, 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"permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 1.01, "window_height": 0.56, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Semi-detached house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "8 Town End Road", "assessment_type": "RdSAP", "completion_date": "2026-05-20", "inspection_date": "2026-05-20", "extensions_count": 1, "measurement_type": 1, "total_floor_area": 127, 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{"value": 10.06, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 15.96, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.32, "quantity": "metres"}, "total_floor_area": {"value": 59.35, "quantity": "square metres"}, "party_wall_length": {"value": 10.06, "quantity": "metres"}, "heat_loss_perimeter": {"value": 21.86, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "E", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "200mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "Y", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 5, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.29, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 8.14, "quantity": "square 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{"pvc_frame": "true", "orientation": 2, "window_type": 1, "glazing_type": 2, "window_width": 1, "window_height": 1.24, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 8, "window_type": 1, "glazing_type": 2, "window_width": 0.57, "window_height": 0.97, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 2, "window_type": 1, "glazing_type": 2, "window_width": 1.48, "window_height": 1.25, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, 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"party_wall_length": {"value": 0.4, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 5.75, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "I", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "150mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 873, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 3.1, "energy_rating_average": 60, "energy_rating_current": 75, "lighting_cost_current": {"value": 139, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 789, "currency": "GBP"}, "hot_water_cost_current": {"value": 330, "currency": 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"heat_loss_perimeter": {"value": 17.4, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.3, "quantity": "metres"}, "total_floor_area": {"value": 42.9, "quantity": "square metres"}, "party_wall_length": {"value": 6.5, "quantity": "metres"}, "heat_loss_perimeter": {"value": 19.7, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "D", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "250mm"}], "boilers_flues_count": 1, "open_chimneys_count": 1, "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 1045, "currency": "GBP"}, "insulated_door_count": 1, "co2_emissions_current": 2.9, "energy_rating_average": 60, "energy_rating_current": 69, "lighting_cost_current": {"value": 63, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 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"construction_age_band": "D", "sap_alternative_wall_1": {"wall_area": 45, "wall_dry_lined": "N", "wall_thickness": 260, "wall_construction": 8, "wall_insulation_type": 4, "wall_thickness_measured": "Y", "wall_insulation_thickness": "NI"}, "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "250mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 1125, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 3.5, "energy_rating_average": 60, "energy_rating_current": 65, "lighting_cost_current": {"value": 65, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "blocked_chimneys_count": 1, "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 1068, 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"country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Semi-detached house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "74 Oxclose Crescent", "assessment_type": "RdSAP", "completion_date": "2026-05-20", "inspection_date": "2026-05-20", "extensions_count": 0, "measurement_type": 1, "total_floor_area": 78, "transaction_type": 14, "conservatory_type": 1, "heated_room_count": 4, "registration_date": "2026-05-20", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "false"}, "secondary_heating": {"description": "None", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "extract_fans_count": 2, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 4, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.47, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 40.67, "quantity": "square metres"}, "party_wall_length": {"value": 7.42, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 20.16, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.47, "quantity": "metres"}, "total_floor_area": {"value": 36.88, "quantity": "square metres"}, "party_wall_length": {"value": 7.42, "quantity": "metres"}, "heat_loss_perimeter": {"value": 17.36, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "C", "party_wall_construction": 2, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "250mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 4, "heating_cost_current": {"value": 1056, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 3.1, "energy_rating_average": 60, "energy_rating_current": 66, "lighting_cost_current": {"value": 64, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 957, "currency": "GBP"}, "hot_water_cost_current": {"value": 296, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 99, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W1", "improvement_details": {"improvement_number": 57}, "improvement_category": 5, "energy_performance_rating": 68, "environmental_impact_rating": 71}, {"sequence": 2, "typical_saving": {"value": 213, "currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 74, "environmental_impact_rating": 73}], "co2_emissions_potential": 2.7, "energy_rating_potential": 74, "lighting_cost_potential": {"value": 64, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 297, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2057.57, "space_heating_existing_dwelling": 10368.65}, "draughtproofed_door_count": 2, "energy_consumption_current": 226, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 191, "environmental_impact_current": 69, "current_energy_efficiency_band": "D", "environmental_impact_potential": 73, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 40, "low_energy_fixed_lighting_bulbs_count": 11, "incandescent_fixed_lighting_bulbs_count": 2}
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"Partial double glazing", "energy_efficiency_rating": 2, "environmental_efficiency_rating": 2}, "addendum": {"addendum_numbers": [14, 15]}, "lighting": {"description": "Below average lighting efficiency", "energy_efficiency_rating": 2, "environmental_efficiency_rating": 2}, "postcode": "SL9 8NF", "hot_water": {"description": "From main system", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "GERRARDS CROSS", "built_form": 2, "created_at": "2026-05-20 14:49:16", "door_count": 3, "region_code": 17, "report_type": 2, "sap_heating": {"number_baths": 1, "cylinder_size": 3, "shower_outlets": [{"shower_wwhrs": 1, "shower_outlet_type": 1}, {"shower_wwhrs": 1, "shower_outlet_type": 1}], "number_baths_wwhrs": 0, "water_heating_code": 901, "water_heating_fuel": 26, "cylinder_thermostat": "Y", "secondary_fuel_type": 6, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2106, "main_heating_category": 2, "main_heating_fraction": 1, "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 10356}], "immersion_heating_type": "NA", "secondary_heating_type": 631, "cylinder_insulation_type": 1, "has_fixed_air_conditioning": "false", "cylinder_insulation_thickness": 25}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 5, "window_width": 2.48, "window_height": 2.58, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 5, "window_width": 1.97, "window_height": 1.16, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 2, "window_width": 3.69, "window_height": 1.73, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 2, "window_width": 3.69, "window_height": 1.73, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 2, "window_width": 1.35, "window_height": 1.19, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 1, "window_type": 1, "glazing_type": 3, "window_width": 0.74, "window_height": 0.95, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 0.59, "window_height": 1.03, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 2, "window_width": 1.18, "window_height": 1.16, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 2, "window_width": 2.18, "window_height": 1.5, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": 12, "orientation": 1, "window_type": 1, "glazing_type": 3, "window_width": 1.78, 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"NA", "wall_thickness_measured": "Y", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI", "flat_roof_insulation_thickness": "125mm"}], "open_chimneys_count": 2, "solar_water_heating": "N", "habitable_room_count": 7, "heating_cost_current": {"value": 2052, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 5.5, "energy_rating_average": 60, "energy_rating_current": 57, "lighting_cost_current": {"value": 194, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "blocked_chimneys_count": 1, "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 1508, "currency": "GBP"}, "hot_water_cost_current": {"value": 294, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 362, "currency": "GBP"}, 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"improvement_category": 5, "energy_performance_rating": 67, "environmental_impact_rating": 70}, {"sequence": 5, "typical_saving": {"value": 247, "currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 71, "environmental_impact_rating": 70}], "co2_emissions_potential": 4.0, "energy_rating_potential": 71, "lighting_cost_potential": {"value": 85, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 295, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 3411.87, "space_heating_existing_dwelling": 20348.96}, "draughtproofed_door_count": 3, "energy_consumption_current": 223, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 74, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 158, "environmental_impact_current": 60, "cfl_fixed_lighting_bulbs_count": 1, "current_energy_efficiency_band": "D", "environmental_impact_potential": 70, "led_fixed_lighting_bulbs_count": 12, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 34, "incandescent_fixed_lighting_bulbs_count": 43}
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"flat_roof_insulation_thickness": "AB"}], "solar_water_heating": "N", "habitable_room_count": 2, "heating_cost_current": {"value": 360, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 1.1, "energy_rating_average": 60, "energy_rating_current": 78, "lighting_cost_current": {"value": 46, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 360, "currency": "GBP"}, "hot_water_cost_current": {"value": 167, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 80, "co2_emissions_potential": 1.1, "energy_rating_potential": 78, "lighting_cost_potential": {"value": 46, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 167, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 1999.23, "space_heating_existing_dwelling": 2506.4}, "draughtproofed_door_count": 0, "energy_consumption_current": 120, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 120, "environmental_impact_current": 83, "current_energy_efficiency_band": "C", "environmental_impact_potential": 83, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 21, "low_energy_fixed_lighting_bulbs_count": 4, "incandescent_fixed_lighting_bulbs_count": 1}
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"window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 1, "window_type": 1, "glazing_type": 13, "window_width": 2.47, "window_height": 1.12, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 1, "window_type": 1, "glazing_type": 13, "window_width": 2.88, "window_height": 2.1, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 1, "window_type": 1, "glazing_type": 13, "window_width": 1.49, "window_height": 1.46, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 1, "window_type": 1, "glazing_type": 13, "window_width": 4.95, "window_height": 2.1, "draught_proofed": "true", 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"window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 5, "window_type": 1, "glazing_type": 13, "window_width": 1.06, "window_height": 1.04, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 5, "window_type": 1, "glazing_type": 13, "window_width": 1.06, "window_height": 0.95, "draught_proofed": "true", "window_location": 3, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 7, "window_type": 1, "glazing_type": 13, "window_width": 0.3, "window_height": 0.97, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 1, "window_type": 1, "glazing_type": 13, "window_width": 1.54, "window_height": 0.97, "draught_proofed": "true", 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0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 1, "window_type": 2, "glazing_type": 13, "window_width": 1, "window_height": 1, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 5, "window_type": 1, "glazing_type": 13, "window_width": 1.06, "window_height": 0.95, "draught_proofed": "true", "window_location": 3, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, {"description": "Boiler and underfloor heating, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", 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"incandescent_fixed_lighting_bulbs_count": 4}
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"co2_emissions_current_per_floor_area": 37, "low_energy_fixed_lighting_bulbs_count": 18, "incandescent_fixed_lighting_bulbs_count": 0}
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"energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Detached house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "1 Paddocks Green", "assessment_type": "RdSAP", "completion_date": "2026-05-20", "inspection_date": "2026-05-20", "extensions_count": 1, "measurement_type": 1, "total_floor_area": 353, "transaction_type": 1, "conservatory_type": 2, "has_draught_lobby": "true", "heated_room_count": 11, "registration_date": "2026-05-20", "sap_energy_source": {"mains_gas": "N", "meter_type": 1, "pv_connection": 2, "photovoltaic_supply": {"pv_arrays": [{"pitch": 2, "peak_power": 4, "orientation": 6, "overshading": 2}]}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "true", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "true"}, "secondary_heating": {"description": "Room heaters, dual fuel (mineral and wood)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "extract_fans_count": 1, "lzc_energy_sources": [11], "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 310, "floor_heat_loss": 7, "sap_room_in_roof": {"floor_area": 60.53, "room_in_roof_type_1": {"gable_wall_type_1": 0, "gable_wall_type_2": 0, "gable_wall_length_1": 4.8, "gable_wall_length_2": 4.8}, "construction_age_band": "H"}, "roof_construction": 4, "wall_construction": 4, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.51, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 135.95, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 55.34, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.33, "quantity": "metres"}, "total_floor_area": {"value": 127.45, "quantity": "square metres"}, "party_wall_length": {"value": 0, 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"roof_insulation_thickness": "200mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "open_chimneys_count": 1, "solar_water_heating": "N", "habitable_room_count": 11, "heating_cost_current": {"value": 7302, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 6.9, "energy_rating_average": 60, "energy_rating_current": 56, "lighting_cost_current": {"value": 339, "currency": "GBP"}, "main_heating_controls": [{"description": "Manual charge control", "energy_efficiency_rating": 2, "environmental_efficiency_rating": 2}], "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 4047, "currency": "GBP"}, "hot_water_cost_current": {"value": 517, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 532, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W2", "improvement_details": {"improvement_number": 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{"improvement_number": 54}, "improvement_category": 6, "energy_performance_rating": 71, "environmental_impact_rating": 94}], "hot_water_cost_potential": {"value": 452, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2658.24, "space_heating_existing_dwelling": 43456.31}, "draughtproofed_door_count": 7, "energy_consumption_current": 225, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 62, "environmental_impact_current": 76, "cfl_fixed_lighting_bulbs_count": 2, "current_energy_efficiency_band": "D", "environmental_impact_potential": 93, "led_fixed_lighting_bulbs_count": 17, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 20, "incandescent_fixed_lighting_bulbs_count": 36}
+{"uprn": 40032301, "roofs": [{"description": "Pitched, 100 mm loft insulation", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}], "walls": [{"description": "Cavity wall, as built, no insulation (assumed)", "energy_efficiency_rating": 2, "environmental_efficiency_rating": 2}], "floors": [{"description": "Solid, no insulation (assumed)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}], "status": "entered", "tenure": 3, "window": {"description": "Fully double glazed", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}, "addendum": {"addendum_numbers": [15], "cavity_fill_recommended": "true"}, "lighting": {"description": "Excellent lighting efficiency", "energy_efficiency_rating": 5, "environmental_efficiency_rating": 5}, "postcode": "L36 3XH", "hot_water": {"description": "From main system", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "LIVERPOOL", "psv_count": 0, "built_form": 4, 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"main_heating_index_number": 9058}], "immersion_heating_type": "NA", "secondary_heating_type": 631, "cylinder_insulation_type": 1, "has_fixed_air_conditioning": "false", "cylinder_insulation_thickness": 50}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 5, "window_width": 0.9, "window_height": 0.9, "draught_proofed": "false", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 5, "window_type": 1, "glazing_type": 5, "window_width": 1.2, "window_height": 0.8, "draught_proofed": "false", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "false", "orientation": 7, "window_type": 1, "glazing_type": 5, "window_width": 1.9, "window_height": 0.6, "draught_proofed": "false", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": 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{"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 14.28, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": "NA", "wall_thickness_measured": "N", "roof_insulation_location": 2, "roof_insulation_thickness": "100mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 2", "wall_dry_lined": "N", "floor_heat_loss": 7, "roof_construction": 5, "wall_construction": 4, "building_part_number": 3, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.29, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 16.97, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 10.01, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "D", "party_wall_construction": "NA", "wall_thickness_measured": "N", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "open_chimneys_count": 2, "solar_water_heating": "N", "habitable_room_count": 7, "heating_cost_current": {"value": 1869, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 7.3, "energy_rating_average": 60, "energy_rating_current": 40, "lighting_cost_current": {"value": 75, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 988, "currency": "GBP"}, "hot_water_cost_current": {"value": 356, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 0, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 159, "currency": "GBP"}, "indicative_cost": "\u00a3900 - \u00a31,500", "improvement_type": "B", 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"incandescent_fixed_lighting_bulbs_count": 0}
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"has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 31, "incandescent_fixed_lighting_bulbs_count": 0}
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"typical_saving": {"value": 91, "currency": "GBP"}, "indicative_cost": "\u00a3130 - \u00a3180", "improvement_type": "F", "improvement_details": {"improvement_number": 4}, "improvement_category": 5, "energy_performance_rating": 76, "environmental_impact_rating": 76}], "co2_emissions_potential": 2.1, "energy_rating_potential": 76, "lighting_cost_potential": {"value": 55, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 258, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 4179.55, "space_heating_existing_dwelling": 5645.48}, "draughtproofed_door_count": 0, "energy_consumption_current": 159, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 130, "environmental_impact_current": 71, "current_energy_efficiency_band": "C", "environmental_impact_potential": 76, "has_heated_separate_conservatory": "false", 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"main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "End-terrace house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "136 Kimberley Road", "assessment_type": "RdSAP", "completion_date": "2026-05-20", "inspection_date": "2026-05-19", "extensions_count": 2, "measurement_type": 1, "total_floor_area": 68, "transaction_type": 14, "conservatory_type": 1, "heated_room_count": 5, "registration_date": "2026-05-20", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "true", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "true"}, 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"None", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 280, "floor_heat_loss": 7, "roof_construction": 3, "wall_construction": 4, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.31, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 55.48, "quantity": "square metres"}, "party_wall_length": {"value": 13.78, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 15.83, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "E", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": "ND", "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 2, "heating_cost_current": {"value": 430, "currency": "GBP"}, 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"currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 74, "environmental_impact_rating": 74}], "co2_emissions_potential": 1.9, "energy_rating_potential": 74, "lighting_cost_potential": {"value": 54, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 341, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2943.43, "space_heating_existing_dwelling": 7503.47}, "draughtproofed_door_count": 1, "energy_consumption_current": 233, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 167, "environmental_impact_current": 66, "cfl_fixed_lighting_bulbs_count": 8, "current_energy_efficiency_band": "D", "environmental_impact_potential": 74, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 41, "incandescent_fixed_lighting_bulbs_count": 0}
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"potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 29, "incandescent_fixed_lighting_bulbs_count": 17}
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"window_height": {"value": 1.01, "quantity": "m"}, "draught_proofed": "true", "window_location": 2, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 2, "glazing_type": 2, "window_width": {"value": 0.6, "quantity": "m"}, "window_height": {"value": 1.01, "quantity": "m"}, "draught_proofed": "true", "window_location": 2, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, oil", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Detached bungalow", "language_code": 1, "pressure_test": 4, "property_type": 1, "address_line_1": "Upper Hazel 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"party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 7, "wall_insulation_thickness": "NI", "sloping_ceiling_insulation_thickness": "AB"}, {"identifier": "Extension 2", "wall_dry_lined": "N", "wall_thickness": 640, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 2, "building_part_number": 3, "sap_floor_dimensions": [{"floor": 0, "room_height": 2.52, "floor_insulation": 1, "total_floor_area": 59.38, "party_wall_length": 0, "floor_construction": 1, "heat_loss_perimeter": 36.52}], "wall_insulation_type": 4, "construction_age_band": "K", "sap_alternative_wall_1": {"wall_area": 35.55, "sheltered_wall": "N", "wall_dry_lined": "N", "wall_thickness": 330, "wall_construction": 4, "wall_insulation_type": 4, "wall_thickness_measured": "Y", "wall_insulation_thickness": "NI"}, "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 4, "roof_insulation_thickness": "NI", "wall_insulation_thickness": "NI"}], "boilers_flues_count": 0, "open_chimneys_count": 0, "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 705, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 3.8, "energy_rating_average": 60, "energy_rating_current": 69, "lighting_cost_current": {"value": 64, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "blocked_chimneys_count": 0, "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 705, "currency": "GBP"}, "hot_water_cost_current": {"value": 295, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "schema_version_current": "LIG-21.0", "suggested_improvements": [{"sequence": 1, "typical_saving": 36, "indicative_cost": "\u00a3600 - \u00a31,500", "improvement_type": "Y", "improvement_details": {"improvement_number": 49}, "improvement_category": 5, "energy_performance_rating": 70, "environmental_impact_rating": 67}, {"sequence": 2, "typical_saving": 295, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 78, "environmental_impact_rating": 69}, {"sequence": 3, "typical_saving": 989, "indicative_cost": "\u00a35,000 - \u00a320,000", "improvement_type": "V2", "improvement_details": {"improvement_number": 44}, "improvement_category": 5, "energy_performance_rating": 95, "environmental_impact_rating": 73}], "co2_emissions_potential": 2.9, "energy_rating_potential": 95, "lighting_cost_potential": {"value": 64, "currency": "GBP"}, "schema_version_original": "LIG-21.0", "hot_water_cost_potential": {"value": 259, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 3706.25, "space_heating_existing_dwelling": 8152.56}, "draughtproofed_door_count": 1, "energy_consumption_current": 142, 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"orientation": 8, "window_type": 1, "glazing_type": 5, "window_width": 0.46, "window_height": 1.56, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 5, "window_type": 1, "glazing_type": 2, "window_width": 2.8, "window_height": 1.16, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Ground-floor flat", "language_code": 1, "pressure_test": 4, "property_type": 2, "address_line_1": "36a, Lansdowne Place", 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"indicative_cost": "\u00a330 - \u00a335", "improvement_type": "E", "improvement_details": {"improvement_number": 35}, "improvement_category": 5, "energy_performance_rating": 79, "environmental_impact_rating": 84}], "co2_emissions_potential": 1.2, "energy_rating_potential": 79, "lighting_cost_potential": {"value": 56, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 167, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2019.71, "space_heating_existing_dwelling": 4355.0}, "draughtproofed_door_count": 0, "energy_consumption_current": 158, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 69, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 118, "environmental_impact_current": 78, "current_energy_efficiency_band": "C", "environmental_impact_potential": 84, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 28, "low_energy_fixed_lighting_bulbs_count": 1, "incandescent_fixed_lighting_bulbs_count": 1}
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"potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 13, "incandescent_fixed_lighting_bulbs_count": 0}
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"energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Mid-terrace house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "24 Westfield Road", "assessment_type": "RdSAP", "completion_date": "2026-05-20", "inspection_date": "2026-05-20", "extensions_count": 1, "measurement_type": 1, "total_floor_area": 70, "transaction_type": 8, "conservatory_type": 1, "heated_room_count": 4, "registration_date": "2026-05-20", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "true", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "true"}, "secondary_heating": {"description": "None", "energy_efficiency_rating": 0, 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{"pvc_frame": "true", "glazing_gap": 6, "orientation": 6, "window_type": 1, "glazing_type": 3, "window_width": 1, "window_height": 1, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": 6, "orientation": 6, "window_type": 1, "glazing_type": 3, "window_width": 1, "window_height": 1, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Ground-floor flat", "language_code": 1, "pressure_test": 4, 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"\u00a35,000 - \u00a310,000", "improvement_type": "W2", "improvement_details": {"improvement_number": 58}, "improvement_category": 5, "energy_performance_rating": 55, "environmental_impact_rating": 71}, {"sequence": 3, "typical_saving": {"value": 55, "currency": "GBP"}, "indicative_cost": "\u00a3220 - \u00a3250", "improvement_type": "G", "improvement_details": {"improvement_number": 14}, "improvement_category": 5, "energy_performance_rating": 57, "environmental_impact_rating": 72}, {"sequence": 4, "typical_saving": {"value": 15, "currency": "GBP"}, "indicative_cost": "\u00a34,000 - \u00a37,000", "improvement_type": "N", "improvement_details": {"improvement_number": 19}, "improvement_category": 5, "energy_performance_rating": 58, "environmental_impact_rating": 73}, {"sequence": 5, "typical_saving": {"value": 37, "currency": "GBP"}, "indicative_cost": "\u00a3600 - \u00a31,500", "improvement_type": "Y", "improvement_details": {"improvement_number": 49}, "improvement_category": 5, 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"environmental_impact_potential": 75, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "D", "co2_emissions_current_per_floor_area": 40, "low_energy_fixed_lighting_bulbs_count": 17, "incandescent_fixed_lighting_bulbs_count": 0}
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1, "window_type": 1, "glazing_type": 13, "window_width": 1.27, "window_height": 0.66, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 5, "window_type": 1, "glazing_type": 13, "window_width": 1.97, "window_height": 1.12, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 5, "window_type": 1, "glazing_type": 13, "window_width": 1.27, "window_height": 1.12, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 5, "window_type": 1, "glazing_type": 13, "window_width": 1.96, "window_height": 1.26, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 1, 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{"value": 2.4, "quantity": "metres"}, "total_floor_area": {"value": 35.7, "quantity": "square metres"}, "party_wall_length": {"value": 13.76, "quantity": "metres"}, "heat_loss_perimeter": {"value": 10.38, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "E", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "200mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 714, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 2.1, "energy_rating_average": 60, "energy_rating_current": 72, "lighting_cost_current": {"value": 50, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "false", "heating_cost_potential": 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"window_width": 1.06, "window_height": 0.65, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Top-floor flat", "language_code": 1, "pressure_test": 4, "property_type": 2, "address_line_1": "9 Hollidge Gardens", "assessment_type": "RdSAP", "completion_date": "2026-05-20", "inspection_date": "2026-05-13", "extensions_count": 0, "measurement_type": 1, "sap_flat_details": {"level": 3, "top_storey": "Y", "storey_count": 2, "flat_location": 1, "heat_loss_corridor": 0}, "total_floor_area": 42, "transaction_type": 8, 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"total_floor_area": {"value": 16.12, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 13.54, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "H", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}], "solar_water_heating": "N", "habitable_room_count": 7, "heating_cost_current": {"value": 1076, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 3.1, "energy_rating_average": 60, "energy_rating_current": 69, "lighting_cost_current": {"value": 65, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "blocked_chimneys_count": 1, "has_hot_water_cylinder": "false", 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"permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 5, "window_type": 1, "glazing_type": 2, "window_width": 0.5, "window_height": 1.15, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 0.87, "window_height": 1.53, "draught_proofed": "true", "window_location": 0, "window_wall_type": 4, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Mid-terrace house", "language_code": 1, "pressure_test": 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{"floor": 1, "room_height": {"value": 2.69, "quantity": "metres"}, "total_floor_area": {"value": 26.23, "quantity": "square metres"}, "party_wall_length": {"value": 14.82, "quantity": "metres"}, "heat_loss_perimeter": {"value": 5.11, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "B", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 220, "floor_heat_loss": 7, "roof_construction": 5, "wall_construction": 3, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.39, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 8.09, "quantity": "square metres"}, "party_wall_length": {"value": 4.11, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 6.08, 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"has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 28, "incandescent_fixed_lighting_bulbs_count": 2}
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"co2_emissions_current_per_floor_area": 89, "low_energy_fixed_lighting_bulbs_count": 2, "incandescent_fixed_lighting_bulbs_count": 2}
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"potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 30, "incandescent_fixed_lighting_bulbs_count": 0}
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{"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 1.31, "window_height": 0.86, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 0.76, "window_height": 1.54, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 2, "window_width": 1.23, "window_height": 1.54, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 2, "window_width": 2.34, "window_height": 1.04, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, 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"true", "addendum_numbers": [14], "cavity_fill_recommended": "true"}, "lighting": {"description": "Below average lighting efficiency", "energy_efficiency_rating": 2, "environmental_efficiency_rating": 2}, "postcode": "SW5 0JP", "hot_water": {"description": "From main system, no cylinder thermostat", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}, "post_town": "LONDON", "built_form": "NR", "created_at": "2026-05-18 14:59:17", "door_count": 2, "region_code": 17, "report_type": 2, "sap_heating": {"number_baths": 2, "cylinder_size": 3, "shower_outlets": [{"shower_wwhrs": 1, "shower_outlet_type": 1}, {"shower_wwhrs": 1, "shower_outlet_type": 1}], "number_baths_wwhrs": 0, "water_heating_code": 901, "water_heating_fuel": 26, "cylinder_thermostat": "N", "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": "NA", "main_heating_number": 1, "main_heating_control": 2104, "main_heating_category": 2, "main_heating_fraction": 1, "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 2044}], "immersion_heating_type": "NA", "cylinder_insulation_type": 2, "has_fixed_air_conditioning": "false", "cylinder_insulation_thickness": 38}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "orientation": 8, "window_type": 1, "glazing_type": 5, "window_width": 0.9, "window_height": 3.1, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 5, "window_width": 1.9, "window_height": 3.1, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 2, "window_type": 1, "glazing_type": 5, "window_width": 0.9, "window_height": 3.1, 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{"value": 842, "currency": "GBP"}, "hot_water_cost_current": {"value": 508, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 17, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 76, "currency": "GBP"}, "indicative_cost": "\u00a3900 - \u00a31,200", "improvement_type": "A2", "improvement_details": {"improvement_number": 45}, "improvement_category": 5, "energy_performance_rating": 54, "environmental_impact_rating": 46}, {"sequence": 2, "typical_saving": {"value": 103, "currency": "GBP"}, "indicative_cost": "\u00a3900 - \u00a31,500", "improvement_type": "B", "improvement_details": {"improvement_number": 6}, "improvement_category": 5, "energy_performance_rating": 56, "environmental_impact_rating": 48}, {"sequence": 3, "typical_saving": {"value": 351, "currency": "GBP"}, "indicative_cost": "\u00a37,500 - \u00a311,000", "improvement_type": "Q", "improvement_details": {"improvement_number": 7}, "improvement_category": 5, 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"indicative_cost": "\u00a3120 - \u00a3140", "improvement_type": "E", "improvement_details": {"improvement_number": 35}, "improvement_category": 5, "energy_performance_rating": 66, "environmental_impact_rating": 61}, {"sequence": 8, "typical_saving": {"value": 140, "currency": "GBP"}, "indicative_cost": "\u00a3130 - \u00a3180", "improvement_type": "F", "improvement_details": {"improvement_number": 4}, "improvement_category": 5, "energy_performance_rating": 69, "environmental_impact_rating": 64}, {"sequence": 9, "typical_saving": {"value": 66, "currency": "GBP"}, "indicative_cost": "\u00a3220 - \u00a3250", "improvement_type": "G", "improvement_details": {"improvement_number": 13}, "improvement_category": 5, "energy_performance_rating": 70, "environmental_impact_rating": 66}, {"sequence": 10, "typical_saving": {"value": 158, "currency": "GBP"}, "indicative_cost": "\u00a32,200 - \u00a33,500", "improvement_type": "I", "improvement_details": {"improvement_number": 20}, 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"incandescent_fixed_lighting_bulbs_count": 0}
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"energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}, "post_town": "NUNEATON", "built_form": 1, "created_at": "2026-05-18 12:27:33", "door_count": 2, "region_code": 6, "report_type": 2, "sap_heating": {"number_baths": 1, "cylinder_size": 2, "number_baths_wwhrs": 0, "water_heating_code": 901, "water_heating_fuel": 26, "cylinder_thermostat": "N", "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2103, "main_heating_category": 2, "main_heating_fraction": 1, "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 10462}], "immersion_heating_type": "NA", "cylinder_insulation_type": 2, "has_fixed_air_conditioning": "false", "cylinder_insulation_thickness": 25}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 5, "window_width": 2.41, "window_height": 1.72, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 5, "window_width": 2.41, "window_height": 1.72, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 5, "window_width": 2.41, "window_height": 1.72, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": 6, "orientation": 5, "window_type": 1, "glazing_type": 1, "window_width": 2.54, "window_height": 2.24, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 5, "window_width": 2.41, "window_height": 1.72, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 5, "window_width": 2.41, "window_height": 1.72, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 5, "window_width": 1.09, "window_height": 1.08, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 5, "window_width": 2.41, "window_height": 1.72, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 5, "window_type": 1, "glazing_type": 5, "window_width": 2.41, "window_height": 1.72, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 5, "window_width": 2.41, "window_height": 1.72, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 5, "window_width": 0.83, "window_height": 1.49, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 5, "window_width": 2.41, "window_height": 1.72, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 5, "window_width": 1.09, "window_height": 1.08, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 5, "window_width": 1.09, "window_height": 1.08, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 5, "window_type": 1, "glazing_type": 5, "window_width": 1.09, "window_height": 1.08, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], 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"is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "false"}, "secondary_heating": {"description": "None", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "closed_flues_count": 1, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 4, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.4, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 68.14, "quantity": "square metres"}, "party_wall_length": {"value": 13.78, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 19.78, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.4, "quantity": "metres"}, "total_floor_area": {"value": 68.14, "quantity": "square metres"}, "party_wall_length": {"value": 13.78, "quantity": "metres"}, "heat_loss_perimeter": {"value": 19.78, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "C", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "150mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.4, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 23.46, "quantity": "square metres"}, "party_wall_length": {"value": 15.4, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 6.89, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "C", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 5, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 2", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 7, "roof_construction": 4, "wall_construction": 4, "building_part_number": 3, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.4, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 25.9, "quantity": "square metres"}, "party_wall_length": {"value": 6.86, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 14.41, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "C", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 5, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "open_chimneys_count": 1, "solar_water_heating": "N", "habitable_room_count": 10, "heating_cost_current": {"value": 2967, 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65, "environmental_impact_rating": 59}, {"sequence": 6, "typical_saving": {"value": 75, "currency": "GBP"}, "indicative_cost": "\u00a3510 - \u00a3595", "improvement_type": "E", "improvement_details": {"improvement_number": 35}, "improvement_category": 5, "energy_performance_rating": 66, "environmental_impact_rating": 59}, {"sequence": 7, "typical_saving": {"value": 168, "currency": "GBP"}, "indicative_cost": "\u00a3130 - \u00a3180", "improvement_type": "F", "improvement_details": {"improvement_number": 4}, "improvement_category": 5, "energy_performance_rating": 68, "environmental_impact_rating": 62}, {"sequence": 8, "typical_saving": {"value": 124, "currency": "GBP"}, "indicative_cost": "\u00a3220 - \u00a3250", "improvement_type": "G", "improvement_details": {"improvement_number": 15}, "improvement_category": 5, "energy_performance_rating": 70, "environmental_impact_rating": 64}, {"sequence": 9, "typical_saving": {"value": 351, "currency": "GBP"}, "indicative_cost": "\u00a34,500 - 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"glazing_type": 2, "window_width": 2.69, "window_height": 1.44, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "false", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 2.86, "window_height": 1.44, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Room heaters, electric", "energy_efficiency_rating": 2, "environmental_efficiency_rating": 5}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Mid-floor flat", "language_code": 1, "pressure_test": 4, "property_type": 2, "address_line_1": "Flat 205", "address_line_2": "7 Garden Walk", "assessment_type": 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"draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": 6, "orientation": 2, "window_type": 1, "glazing_type": 3, "window_width": {"value": 1.78, "quantity": "m"}, "window_height": {"value": 2.05, "quantity": "m"}, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Room heaters, electric", "energy_efficiency_rating": 1, "environmental_efficiency_rating": 5}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Mid-floor flat", "language_code": 1, "pressure_test": 4, "property_type": 2, "address_line_1": "Flat 7", "address_line_2": "Queensgate Court", "address_line_3": "44 Alexandra Grove", "assessment_type": "RdSAP", "completion_date": "2026-05-18", "inspection_date": "2026-05-18", "extensions_count": 0, "measurement_type": 1, "open_flues_count": 0, "sap_flat_details": {"level": 2, "top_storey": "N", "storey_count": 3, "flat_location": 1, "heat_loss_corridor": 2, "unheated_corridor_length": 5.03}, "total_floor_area": 76, "transaction_type": 8, "conservatory_type": 1, "heated_room_count": 3, "other_flues_count": 0, "registration_date": "2026-05-18", "sap_energy_source": {"mains_gas": "N", "meter_type": 2, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "false"}, "secondary_heating": {"description": "None", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "closed_flues_count": 0, "extract_fans_count": 2, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 300, "floor_heat_loss": 6, "roof_construction": 3, "wall_construction": 4, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": 2.35, "floor_insulation": 0, "total_floor_area": 76.03, "party_wall_length": 12.79, "floor_construction": 0, "heat_loss_perimeter": 22.85}], "wall_insulation_type": 4, "construction_age_band": "G", "sap_alternative_wall_1": {"wall_area": 11.821, "sheltered_wall": "Y", "wall_dry_lined": "N", "wall_construction": 4, "wall_insulation_type": 4, "wall_thickness_measured": "N", "wall_insulation_thickness": "NI"}, "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": "ND", "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI"}], "boilers_flues_count": 0, "open_chimneys_count": 0, "solar_water_heating": "N", "habitable_room_count": 3, "heating_cost_current": {"value": 721, "currency": "GBP"}, 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3, "window_type": 1, "glazing_type": 4, "window_width": 0.56, "window_height": 1.2, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 5, "window_width": 1.37, "window_height": 1.2, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 5, "window_width": 0.78, "window_height": 0.91, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 3, "window_type": 1, "glazing_type": 4, "window_width": 1.51, "window_height": 1.04, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"orientation": 7, "window_type": 1, "glazing_type": 4, "window_width": 1.49, "window_height": 0.98, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 5, "window_width": 1.49, "window_height": 0.98, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 5, "window_width": 0.28, "window_height": 1.02, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 5, "window_width": 1.49, "window_height": 1.01, "draught_proofed": "false", "window_location": 0, 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"glazing_gap": 6, "orientation": 5, "window_type": 1, "glazing_type": 3, "window_width": 2.36, "window_height": 3.13, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Electric storage heaters", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 5}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Detached house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "95 West Street", "address_line_2": "Corfe Castle", "assessment_type": "RdSAP", "completion_date": "2026-05-18", "inspection_date": "2026-05-18", "extensions_count": 1, "measurement_type": 1, "total_floor_area": 167, "transaction_type": 1, "conservatory_type": 1, 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{"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 34.66, "quantity": "metres"}}, {"floor": 1, "room_height": {"value": 2.43, "quantity": "metres"}, "total_floor_area": {"value": 45.69, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "heat_loss_perimeter": {"value": 22.9, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "C", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "150mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 280, "floor_heat_loss": 7, "roof_construction": 8, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 3.02, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 58.89, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 27.69, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "F", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 7, "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI", "sloping_ceiling_insulation_thickness": "AB"}], "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 4680, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 4.7, "energy_rating_average": 60, "energy_rating_current": 34, "lighting_cost_current": {"value": 93, "currency": "GBP"}, "main_heating_controls": [{"description": "Manual charge control", "energy_efficiency_rating": 2, "environmental_efficiency_rating": 2}], "blocked_chimneys_count": 1, "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 1453, "currency": "GBP"}, "hot_water_cost_current": {"value": 709, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 55, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 260, "currency": "GBP"}, "indicative_cost": "\u00a3900 - \u00a31,200", "improvement_type": "A2", "improvement_details": {"improvement_number": 45}, "improvement_category": 5, "energy_performance_rating": 37, "environmental_impact_rating": 68}, {"sequence": 2, "typical_saving": {"value": 844, "currency": "GBP"}, "indicative_cost": "\u00a3900 - \u00a31,500", "improvement_type": "B", "improvement_details": {"improvement_number": 6}, "improvement_category": 5, "energy_performance_rating": 45, "environmental_impact_rating": 73}, {"sequence": 3, "typical_saving": {"value": 206, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W1", "improvement_details": {"improvement_number": 57}, "improvement_category": 5, "energy_performance_rating": 48, "environmental_impact_rating": 74}, {"sequence": 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{"improvement_number": 54}, "improvement_category": 6, "energy_performance_rating": 65, "environmental_impact_rating": 93}, {"sequence": 3, "typical_saving": {"value": 1926, "currency": "GBP"}, "improvement_type": "Z3", "improvement_details": {"improvement_number": 53}, "improvement_category": 6, "energy_performance_rating": 69, "environmental_impact_rating": 62}], "hot_water_cost_potential": {"value": 263, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2668.94, "space_heating_existing_dwelling": 31120.11}, "draughtproofed_door_count": 3, "energy_consumption_current": 311, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 67, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 138, "environmental_impact_current": 66, "current_energy_efficiency_band": "F", "environmental_impact_potential": 70, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 28, "low_energy_fixed_lighting_bulbs_count": 20, "incandescent_fixed_lighting_bulbs_count": 0}
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"energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "HULL", "built_form": 3, "created_at": "2026-05-18 14:01:45", "door_count": 0, "region_code": 3, "report_type": 2, "sap_heating": {"number_baths": 1, "cylinder_size": 2, "shower_outlets": [{"shower_wwhrs": 1, "shower_outlet_type": 2}, {"shower_wwhrs": 1, "shower_outlet_type": 1}], "number_baths_wwhrs": 0, "water_heating_code": 901, "water_heating_fuel": 26, "cylinder_thermostat": "Y", "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2106, "main_heating_category": 2, "main_heating_fraction": 1, "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 18045}], "immersion_heating_type": "NA", "cylinder_insulation_type": 1, "has_fixed_air_conditioning": "false", "cylinder_insulation_thickness": 38}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "glazing_gap": "16+", "orientation": 5, "window_type": 1, "glazing_type": 3, "window_width": 1, "window_height": 1.2, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 3, "window_type": 1, "glazing_type": 3, "window_width": 1, "window_height": 4.86, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 7, "window_type": 1, "glazing_type": 3, "window_width": 1, "window_height": 7.14, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "End-terrace house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "139 Staveley Road", "assessment_type": "RdSAP", "completion_date": "2026-05-18", "inspection_date": "2026-04-27", "extensions_count": 1, "measurement_type": 1, "total_floor_area": 89, "transaction_type": 14, "conservatory_type": 1, "heated_room_count": 3, "registration_date": "2026-05-18", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "false"}, 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"party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 5, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 250, "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 3, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.3, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 12, "quantity": "square metres"}, "party_wall_length": {"value": 4, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 6, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "D", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}], "solar_water_heating": "N", 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"incandescent_fixed_lighting_bulbs_count": 0}
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"\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 83, "environmental_impact_rating": 82}], "co2_emissions_potential": 1.7, "energy_rating_potential": 83, "lighting_cost_potential": {"value": 48, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 206, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2361.4, "space_heating_existing_dwelling": 5278.0}, "draughtproofed_door_count": 1, "energy_consumption_current": 130, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 106, "environmental_impact_current": 79, "current_energy_efficiency_band": "C", "environmental_impact_potential": 82, "led_fixed_lighting_bulbs_count": 27, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "B", 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"wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "270mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 2, "heating_cost_current": {"value": 640, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 2.0, "energy_rating_average": 60, "energy_rating_current": 70, "lighting_cost_current": {"value": 34, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer and room thermostat", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 463, "currency": "GBP"}, "hot_water_cost_current": {"value": 183, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 176, "currency": "GBP"}, "indicative_cost": "\u00a37,500 - \u00a311,000", "improvement_type": "Q", 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"has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "B", "co2_emissions_current_per_floor_area": 26, "incandescent_fixed_lighting_bulbs_count": 0}
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"low_energy_fixed_lighting_bulbs_count": 9, "incandescent_fixed_lighting_bulbs_count": 0}
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"metres"}}], "wall_insulation_type": 4, "construction_age_band": "E", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "250mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 6, "heating_cost_current": {"value": 1496, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 3.6, "energy_rating_average": 60, "energy_rating_current": 58, "lighting_cost_current": {"value": 80, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer and room thermostat", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 918, "currency": "GBP"}, "hot_water_cost_current": {"value": 192, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 110, "currency": "GBP"}, "indicative_cost": "\u00a3900 - \u00a31,500", "improvement_type": "B", "improvement_details": {"improvement_number": 6}, "improvement_category": 5, "energy_performance_rating": 61, "environmental_impact_rating": 64}, {"sequence": 2, "typical_saving": {"value": 316, "currency": "GBP"}, "indicative_cost": "\u00a37,500 - \u00a311,000", "improvement_type": "Q", "improvement_details": {"improvement_number": 7}, "improvement_category": 5, "energy_performance_rating": 67, "environmental_impact_rating": 72}, {"sequence": 3, "typical_saving": {"value": 101, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W1", "improvement_details": {"improvement_number": 57}, "improvement_category": 5, "energy_performance_rating": 70, "environmental_impact_rating": 74}, {"sequence": 4, "typical_saving": {"value": 22, "currency": "GBP"}, "indicative_cost": "\u00a3150 - \u00a3175", "improvement_type": "E", "improvement_details": 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"incandescent_fixed_lighting_bulbs_count": 0}
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"total_floor_area": {"value": 45.72, "quantity": "square metres"}, "party_wall_length": {"value": 6.84, "quantity": "metres"}, "floor_construction": 0, "heat_loss_perimeter": {"value": 20.3, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "G", "sap_alternative_wall_1": {"wall_area": 8.625, "sheltered_wall": "Y", "wall_dry_lined": "N", "wall_thickness": 300, "wall_construction": 4, "wall_insulation_type": 4, "wall_thickness_measured": "Y", "wall_insulation_thickness": "NI"}, "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": "ND", "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI"}], "boilers_flues_count": 1, "open_chimneys_count": 0, "solar_water_heating": "N", "habitable_room_count": 2, "heating_cost_current": {"value": 446, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 1.3, "energy_rating_average": 60, "energy_rating_current": 70, "lighting_cost_current": {"value": 70, 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"glazing_type": 3, "window_width": 1.3, "window_height": 1.25, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": 6, "orientation": 5, "window_type": 1, "glazing_type": 3, "window_width": 2.4, "window_height": 1.35, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "false", "glazing_gap": 12, "orientation": 3, "window_type": 1, "glazing_type": 3, "window_width": 2.4, "window_height": 2, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, oil", "energy_efficiency_rating": 2, "environmental_efficiency_rating": 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"total_floor_area": {"value": 42.64, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "heat_loss_perimeter": {"value": 23.14, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "A", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 4, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 4", "wall_dry_lined": "N", "wall_thickness": 550, "floor_heat_loss": 7, "roof_construction": 5, "wall_construction": 2, "building_part_number": 5, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 1.98, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 19.17, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 16.53, "quantity": "metres"}}], "wall_insulation_type": 4, 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120, "currency": "GBP"}, "indicative_cost": "\u00a320 - \u00a340", "improvement_type": "C", "improvement_details": {"improvement_number": 2}, "improvement_category": 5, "energy_performance_rating": 44, "environmental_impact_rating": 30}, {"sequence": 5, "typical_saving": {"value": 141, "currency": "GBP"}, "indicative_cost": "\u00a3150 - \u00a3250", "improvement_type": "D", "improvement_details": {"improvement_number": 10}, "improvement_category": 5, "energy_performance_rating": 47, "environmental_impact_rating": 32}, {"sequence": 6, "typical_saving": {"value": 219, "currency": "GBP"}, "indicative_cost": "\u00a3130 - \u00a3180", "improvement_type": "F", "improvement_details": {"improvement_number": 4}, "improvement_category": 5, "energy_performance_rating": 51, "environmental_impact_rating": 35}, {"sequence": 7, "typical_saving": {"value": 625, "currency": "GBP"}, "indicative_cost": "\u00a32,200 - \u00a33,500", "improvement_type": "I", "improvement_details": {"improvement_number": 20}, 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"indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 76, "environmental_impact_rating": 74}], "co2_emissions_potential": 1.5, "energy_rating_potential": 76, "lighting_cost_potential": {"value": 26, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 166, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 1773.27, "space_heating_existing_dwelling": 2316.17}, "draughtproofed_door_count": 1, "energy_consumption_current": 259, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 218, "environmental_impact_current": 71, "current_energy_efficiency_band": "C", "environmental_impact_potential": 74, "led_fixed_lighting_bulbs_count": 5, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": 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"low_energy_fixed_lighting_bulbs_count": 9, "incandescent_fixed_lighting_bulbs_count": 5}
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"glazing_type": 2, "window_width": 1.79, "window_height": 1.03, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 1.79, "window_height": 0.53, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 1.79, "window_height": 1.46, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 2, "window_width": 1.9, "window_height": 2.02, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", 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"window_type": 1, "glazing_type": 3, "window_width": 1.72, "window_height": 1.12, "draught_proofed": "true", "window_location": 2, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 3, "window_type": 1, "glazing_type": 3, "window_width": 1.72, "window_height": 1.06, "draught_proofed": "true", "window_location": 2, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Detached bungalow", "language_code": 1, "pressure_test": 4, "property_type": 1, "address_line_1": "27 Tritton 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"party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 10.42, "quantity": "metres"}}], "wall_insulation_type": 2, "construction_age_band": "G", "party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}, {"identifier": "Extension 2", "wall_dry_lined": "N", "wall_thickness": 170, "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 5, "building_part_number": 3, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.28, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 24.12, "quantity": "square metres"}, "party_wall_length": {"value": 0, "quantity": "metres"}, "floor_construction": 1, "heat_loss_perimeter": {"value": 12.57, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "H", "party_wall_construction": 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"improvement_type": "W2", "improvement_details": {"improvement_number": 58}, "improvement_category": 5, "energy_performance_rating": 90, "environmental_impact_rating": 78}], "co2_emissions_potential": 2.3, "energy_rating_potential": 90, "lighting_cost_potential": {"value": 64, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 214, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2592.76, "space_heating_existing_dwelling": 10659.64}, "draughtproofed_door_count": 0, "energy_consumption_current": 117, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 100, "environmental_impact_current": 75, "current_energy_efficiency_band": "B", "environmental_impact_potential": 78, "led_fixed_lighting_bulbs_count": 48, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "B", "co2_emissions_current_per_floor_area": 22, "incandescent_fixed_lighting_bulbs_count": 0}
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1.9, "window_height": 1.2, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 1.9, "window_height": 1.2, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 0.8, "window_height": 1.2, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 2, "window_width": 0.8, "window_height": 1.2, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", 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"metres"}}, {"floor": 1, "room_height": {"value": 2.2, "quantity": "metres"}, "total_floor_area": {"value": 32.53, "quantity": "square metres"}, "party_wall_length": {"value": 7.46, "quantity": "metres"}, "heat_loss_perimeter": {"value": 16.18, "quantity": "metres"}}], "wall_insulation_type": 1, "construction_age_band": "D", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "175mm", "wall_insulation_thickness": "100mm", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 5, "heating_cost_current": {"value": 612, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 1.8, "energy_rating_average": 60, "energy_rating_current": 76, "lighting_cost_current": {"value": 46, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "blocked_chimneys_count": 1, "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 549, "currency": "GBP"}, "hot_water_cost_current": {"value": 169, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 63, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W2", "improvement_details": {"improvement_number": 58}, "improvement_category": 5, "energy_performance_rating": 77, "environmental_impact_rating": 80}, {"sequence": 2, "typical_saving": {"value": 184, "currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 82, "environmental_impact_rating": 81}], "co2_emissions_potential": 1.6, "energy_rating_potential": 82, "lighting_cost_potential": {"value": 46, "currency": "GBP"}, "schema_version_original": "21.0.1", 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"permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 6, "window_type": 1, "glazing_type": 3, "window_width": 0.6, "window_height": 1.2, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 2, "window_type": 1, "glazing_type": 3, "window_width": 0.3, "window_height": 0.8, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Room heaters, electric", "energy_efficiency_rating": 2, "environmental_efficiency_rating": 5}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Mid-floor flat", "language_code": 1, "pressure_test": 4, "property_type": 2, "address_line_1": "Flat 2", "address_line_2": "52a Queen Street", "assessment_type": "RdSAP", "completion_date": "2026-05-13", "inspection_date": "2026-05-13", "extensions_count": 1, "measurement_type": 1, "sap_flat_details": {"level": 2, "top_storey": "N", "storey_count": 4, "flat_location": 1, "heat_loss_corridor": 3, "unheated_corridor_length": 8.9}, "total_floor_area": 54, "transaction_type": 8, "conservatory_type": 1, "heated_room_count": 3, "registration_date": "2026-05-13", "sap_energy_source": {"mains_gas": "N", "meter_type": 1, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "true"}, "secondary_heating": {"description": "Room heaters, electric", "energy_efficiency_rating": 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"co2_emissions_current_per_floor_area": 19, "incandescent_fixed_lighting_bulbs_count": 4}
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"incandescent_fixed_lighting_bulbs_count": 0}
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"incandescent_fixed_lighting_bulbs_count": 0}
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{"description": "From main system", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "LEICESTER", "built_form": 1, "created_at": "2026-05-16 13:19:30", "door_count": 2, "region_code": 6, "report_type": 2, "sap_heating": {"number_baths": 1, "cylinder_size": 2, "shower_outlets": [{"shower_wwhrs": 1, "shower_outlet_type": 1}, {"shower_wwhrs": 1, "shower_outlet_type": 2}], "number_baths_wwhrs": 0, "water_heating_code": 901, "water_heating_fuel": 26, "cylinder_thermostat": "Y", "secondary_fuel_type": 26, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2104, "main_heating_category": 2, "main_heating_fraction": 1, "sap_main_heating_code": 102, "central_heating_pump_age": 1, "main_heating_data_source": 2}], "immersion_heating_type": "NA", "secondary_heating_type": 605, "cylinder_insulation_type": 1, "has_fixed_air_conditioning": "false", "cylinder_insulation_thickness": 12}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "glazing_gap": "16+", "orientation": 1, "window_type": 1, "glazing_type": 3, "window_width": 2.89, "window_height": 1.27, "draught_proofed": "true", "window_location": 4, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 1, "window_type": 1, "glazing_type": 5, "window_width": 0.68, "window_height": 0.68, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 5, "window_type": 1, "glazing_type": 5, "window_width": 1.75, "window_height": 0.85, "draught_proofed": "false", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "glazing_gap": "16+", "orientation": 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"is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "false"}, "secondary_heating": {"description": "None", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "extract_fans_count": 1, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 220, "floor_heat_loss": 6, "roof_construction": 3, "wall_construction": 8, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.38, "quantity": "metres"}, "total_floor_area": {"value": 72.99, "quantity": "square metres"}, "party_wall_length": {"value": 11, "quantity": "metres"}, "heat_loss_perimeter": {"value": 24.74, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "J", "sap_alternative_wall_1": {"wall_area": 16.3506, "sheltered_wall": "Y", "wall_dry_lined": "N", "wall_thickness": 220, "wall_construction": 8, "wall_insulation_type": 4, "wall_thickness_measured": "Y", 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"improvement_type": "L2", "improvement_details": {"improvement_number": 61}, "improvement_category": 5, "energy_performance_rating": 84, "environmental_impact_rating": 93}], "co2_emissions_potential": 0.6, "energy_rating_potential": 84, "lighting_cost_potential": {"value": 56, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 362, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2178.37, "space_heating_existing_dwelling": 2197.39}, "draughtproofed_door_count": 0, "energy_consumption_current": 97, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "5.02r0344", "energy_consumption_potential": 95, "environmental_impact_current": 92, "current_energy_efficiency_band": "C", "environmental_impact_potential": 93, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "B", "co2_emissions_current_per_floor_area": 9, "low_energy_fixed_lighting_bulbs_count": 8, "incandescent_fixed_lighting_bulbs_count": 0}
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"party_wall_construction": "NA", "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "100mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 6, "heating_cost_current": {"value": 1197, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 3.9, "energy_rating_average": 60, "energy_rating_current": 70, "lighting_cost_current": {"value": 66, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer and room thermostat", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}], "has_hot_water_cylinder": "true", "heating_cost_potential": {"value": 1049, "currency": "GBP"}, "hot_water_cost_current": {"value": 279, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 84, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - 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"incandescent_fixed_lighting_bulbs_count": 0}
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"low_energy_fixed_lighting_bulbs_count": 9, "incandescent_fixed_lighting_bulbs_count": 0}
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{"improvement_number": 44}, "improvement_category": 5, "energy_performance_rating": 75, "environmental_impact_rating": 57}], "co2_emissions_potential": 14, "energy_rating_potential": 75, "lighting_cost_potential": {"value": 128, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 229, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 5740.2, "space_heating_existing_dwelling": 37666.7}, "draughtproofed_door_count": 0, "energy_consumption_current": 183, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 0, "sap_deselected_improvements": ["O"], "calculation_software_version": "5.02r0344", "energy_consumption_potential": 123, "environmental_impact_current": 44, "current_energy_efficiency_band": "D", "environmental_impact_potential": 57, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 50, "low_energy_fixed_lighting_bulbs_count": 64, 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"wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "solar_water_heating": "N", "habitable_room_count": 3, "heating_cost_current": {"value": 953, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 2.9, "energy_rating_average": 60, "energy_rating_current": 63, "lighting_cost_current": {"value": 45, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 582, "currency": "GBP"}, "hot_water_cost_current": {"value": 178, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 306, "currency": "GBP"}, "indicative_cost": "\u00a37,500 - \u00a311,000", "improvement_type": "Q", "improvement_details": {"improvement_number": 7}, "improvement_category": 5, "energy_performance_rating": 71, "environmental_impact_rating": 73}, {"sequence": 2, "typical_saving": {"value": 65, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W1", "improvement_details": {"improvement_number": 57}, "improvement_category": 5, "energy_performance_rating": 73, "environmental_impact_rating": 76}, {"sequence": 3, "typical_saving": {"value": 180, "currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 78, "environmental_impact_rating": 77}], "co2_emissions_potential": 1.7, "energy_rating_potential": 78, "lighting_cost_potential": {"value": 45, "currency": "GBP"}, "schema_version_original": "21.0.1", "hot_water_cost_potential": {"value": 178, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2147.19, "space_heating_existing_dwelling": 9032.7}, 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{"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 2, "window_width": 1.05, "window_height": 1.78, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 2, "window_width": 1.05, "window_height": 1.78, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 7, "window_type": 1, "glazing_type": 2, "window_width": 1.05, "window_height": 1.3, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 3, "window_type": 1, "glazing_type": 2, "window_width": 1.05, "window_height": 1.32, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, 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"has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "B", "co2_emissions_current_per_floor_area": 43, "incandescent_fixed_lighting_bulbs_count": 4}
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"metres"}}], "wall_insulation_type": 4, "construction_age_band": "F", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "200mm", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "wall_thickness": 330, "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 4, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.34, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 8.86, "quantity": "square metres"}, "party_wall_length": {"value": 1.6, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 7.14, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "F", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}, {"identifier": "Extension 2", "wall_dry_lined": "N", "wall_thickness": 330, "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 4, "building_part_number": 3, "sap_floor_dimensions": [{"floor": 0, "room_height": {"value": 2.34, "quantity": "metres"}, "floor_insulation": 1, "total_floor_area": {"value": 8.86, "quantity": "square metres"}, "party_wall_length": {"value": 1.6, "quantity": "metres"}, "floor_construction": 2, "heat_loss_perimeter": {"value": 7.14, "quantity": "metres"}}], "wall_insulation_type": 4, "construction_age_band": "F", "party_wall_construction": 1, "wall_thickness_measured": "Y", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}], "solar_water_heating": "N", "habitable_room_count": 4, "heating_cost_current": {"value": 787, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 2.3, "energy_rating_average": 60, "energy_rating_current": 66, "lighting_cost_current": {"value": 141, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 661, "currency": "GBP"}, "hot_water_cost_current": {"value": 279, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 67, "currency": "GBP"}, "indicative_cost": "\u00a3900 - \u00a31,500", "improvement_type": "B", "improvement_details": {"improvement_number": 6}, "improvement_category": 5, "energy_performance_rating": 68, "environmental_impact_rating": 76}, {"sequence": 2, "typical_saving": {"value": 72, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W1", "improvement_details": {"improvement_number": 57}, "improvement_category": 5, "energy_performance_rating": 69, "environmental_impact_rating": 78}, {"sequence": 3, "typical_saving": {"value": 83, "currency": "GBP"}, "indicative_cost": "\u00a3480 - \u00a3560", "improvement_type": "E", "improvement_details": {"improvement_number": 35}, "improvement_category": 5, "energy_performance_rating": 72, "environmental_impact_rating": 78}, {"sequence": 4, "typical_saving": {"value": 204, "currency": "GBP"}, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 77, "environmental_impact_rating": 79}], "co2_emissions_potential": 1.8, "energy_rating_potential": 77, "lighting_cost_potential": {"value": 45, "currency": "GBP"}, "schema_version_original": "21.0.1", "alternative_improvements": [{"sequence": 1, "typical_saving": {"value": 39, "currency": "GBP"}, "improvement_type": "Q2", "improvement_details": {"improvement_number": 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"door_count": 2, "region_code": 19, "report_type": 2, "sap_heating": {"number_baths": 1, "cylinder_size": 1, "number_baths_wwhrs": 0, "water_heating_code": 999, "water_heating_fuel": 0, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 0, "heat_emitter_type": 0, "emitter_temperature": "NA", "main_heating_number": 1, "main_heating_control": 2699, "main_heating_category": 1, "main_heating_fraction": 1, "sap_main_heating_code": 699, "main_heating_data_source": 2}], "immersion_heating_type": "NA", "has_fixed_air_conditioning": "false"}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "orientation": 4, "window_type": 1, "glazing_type": 5, "window_width": 1.1, "window_height": 1.6, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 4, "window_type": 1, "glazing_type": 5, "window_width": 1.1, "window_height": 1.6, "draught_proofed": 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{"pvc_frame": "true", "orientation": 2, "window_type": 1, "glazing_type": 5, "window_width": 0.7, "window_height": 1.4, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 2, "window_type": 1, "glazing_type": 5, "window_width": 0.6, "window_height": 1.6, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 2, "window_type": 1, "glazing_type": 5, "window_width": 0.7, "window_height": 1.6, "draught_proofed": "false", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "No system present: electric heaters assumed", "energy_efficiency_rating": 1, "environmental_efficiency_rating": 5}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Detached house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "Burn Spring Farm", "address_line_2": "Grains Bar", "assessment_type": "RdSAP", "completion_date": "2026-05-27", "inspection_date": "2026-05-22", "extensions_count": 0, "measurement_type": 1, "total_floor_area": 154, "transaction_type": 1, "conservatory_type": 1, "heated_room_count": 0, "registration_date": "2026-05-27", "sap_energy_source": {"mains_gas": "N", "meter_type": 2, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 3, "electricity_smart_meter_present": "false"}, "secondary_heating": {"description": 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"wall_thickness_measured": "Y", "roof_insulation_location": 5, "roof_insulation_thickness": "ND", "wall_insulation_thickness": "NI", "floor_insulation_thickness": "NI"}], "open_chimneys_count": 3, "solar_water_heating": "N", "habitable_room_count": 6, "heating_cost_current": {"value": 10595, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 6.5, "energy_rating_average": 60, "energy_rating_current": 1, "lighting_cost_current": {"value": 213, "currency": "GBP"}, "main_heating_controls": [{"description": "None", "energy_efficiency_rating": 1, "environmental_efficiency_rating": 1}], "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 2834, "currency": "GBP"}, "hot_water_cost_current": {"value": 1098, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 0, "suggested_improvements": [{"sequence": 1, "typical_saving": {"value": 1766, "currency": "GBP"}, "indicative_cost": "\u00a3900 - \u00a31,200", "improvement_type": "A", "improvement_details": {"improvement_number": 5}, "improvement_category": 5, "energy_performance_rating": 1, "environmental_impact_rating": 64}, {"sequence": 2, "typical_saving": {"value": 2910, "currency": "GBP"}, "indicative_cost": "\u00a37,500 - \u00a311,000", "improvement_type": "Q", "improvement_details": {"improvement_number": 7}, "improvement_category": 5, "energy_performance_rating": 15, "environmental_impact_rating": 74}, {"sequence": 3, "typical_saving": {"value": 403, "currency": "GBP"}, "indicative_cost": "\u00a35,000 - \u00a310,000", "improvement_type": "W2", "improvement_details": {"improvement_number": 58}, "improvement_category": 5, "energy_performance_rating": 18, "environmental_impact_rating": 76}, {"sequence": 4, "typical_saving": {"value": 435, "currency": "GBP"}, "indicative_cost": "\u00a3150 - \u00a3250", "improvement_type": "D", "improvement_details": {"improvement_number": 10}, "improvement_category": 5, "energy_performance_rating": 21, "environmental_impact_rating": 77}, {"sequence": 5, "typical_saving": {"value": 64, "currency": "GBP"}, "indicative_cost": "\u00a3210 - \u00a3245", "improvement_type": "E", "improvement_details": {"improvement_number": 35}, "improvement_category": 5, "energy_performance_rating": 22, "environmental_impact_rating": 78}, {"sequence": 6, "typical_saving": {"value": 2670, "currency": "GBP"}, "indicative_cost": "\u00a32,400 - \u00a34,800", "improvement_type": "L2", "improvement_details": {"improvement_number": 61}, "improvement_category": 5, "energy_performance_rating": 60, "environmental_impact_rating": 81}, {"sequence": 7, "typical_saving": {"value": 284, "currency": "GBP"}, "indicative_cost": "\u00a34,500 - \u00a36,000", "improvement_type": "O", "improvement_details": {"improvement_number": 8}, "improvement_category": 5, "energy_performance_rating": 63, "environmental_impact_rating": 83}, {"sequence": 8, "typical_saving": {"value": 271, "currency": "GBP"}, "indicative_cost": "\u00a38,000 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"postcode": "B69 2BA", "hot_water": {"description": "From main system", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "OLDBURY", "built_form": 4, "created_at": "2026-05-27 22:36:19", "door_count": 2, "region_code": 6, "report_type": 2, "sap_heating": {"number_baths": 1, "cylinder_size": 1, "number_baths_wwhrs": 0, "water_heating_code": 901, "water_heating_fuel": 26, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 0, "main_heating_number": 1, "main_heating_control": 2106, "main_heating_category": 2, "main_heating_fraction": 1, "sap_main_heating_code": 104, "central_heating_pump_age": 0, "main_heating_data_source": 2}], "immersion_heating_type": "NA", "has_fixed_air_conditioning": "false"}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "glazing_gap": 12, "orientation": 5, "window_type": 1, "glazing_type": 3, "window_width": 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"low_energy_fixed_lighting_bulbs_count": 29, "incandescent_fixed_lighting_bulbs_count": 5}
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"air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Semi-detached house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "319a Long Banks", "assessment_type": "RdSAP", "completion_date": "2026-05-27", "inspection_date": "2026-05-11", "extensions_count": 1, "measurement_type": 1, "total_floor_area": 118, "transaction_type": 5, "conservatory_type": 1, "has_draught_lobby": "true", "heated_room_count": 6, "registration_date": "2026-05-27", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "pv_batteries": [{"battery_capacity": 5}], "pv_connection": 2, "pv_battery_count": 1, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 40}}, "wind_turbines_count": 0, "gas_smart_meter_present": "false", "is_dwelling_export_capable": "true", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "false"}, "secondary_heating": {"description": "None", 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"incandescent_fixed_lighting_bulbs_count": 4}
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+{"uprn": 100010391723, "roofs": [{"description": "Pitched, 100 mm loft insulation", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}, {"description": "Flat, insulated", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}, {"description": "Roof room(s), limited insulation", "energy_efficiency_rating": 1, "environmental_efficiency_rating": 1}], "walls": [{"description": "Solid brick, as built, no insulation (assumed)", "energy_efficiency_rating": 1, "environmental_efficiency_rating": 1}, {"description": "Cavity wall, as built, insulated (assumed)", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "floors": [{"description": "Solid, no insulation (assumed)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}], "status": "entered", "tenure": 1, "window": {"description": "Fully double glazed", "energy_efficiency_rating": 3, "environmental_efficiency_rating": 3}, "addendum": {"addendum_numbers": [15]}, "lighting": {"description": "Excellent lighting efficiency", "energy_efficiency_rating": 5, "environmental_efficiency_rating": 5}, "postcode": "PR5 0DQ", "hot_water": {"description": "From main system", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}, "post_town": "PRESTON", "psv_count": 0, "built_form": 4, "created_at": "2026-05-27 14:10:54", "door_count": 2, "region_code": 7, "report_type": 2, "sap_heating": {"number_baths": 0, "cylinder_size": 1, "shower_outlets": [{"shower_wwhrs": 1, "shower_outlet_type": 4}], "number_baths_wwhrs": 0, "water_heating_code": 901, "water_heating_fuel": 26, "cylinder_thermostat": "N", "secondary_fuel_type": 5, "main_heating_details": [{"has_fghrs": "N", "main_fuel_type": 26, "boiler_flue_type": 2, "fan_flue_present": "Y", "heat_emitter_type": 1, "emitter_temperature": 1, "main_heating_number": 1, "main_heating_control": 2106, "main_heating_category": 2, "main_heating_fraction": 1, "central_heating_pump_age": 0, "main_heating_data_source": 1, "main_heating_index_number": 18760}], "immersion_heating_type": "NA", "secondary_heating_type": 633, "has_fixed_air_conditioning": "false"}, "sap_version": 10.2, "sap_windows": [{"pvc_frame": "true", "orientation": 8, "window_type": 1, "glazing_type": 2, "window_width": {"value": 1.875, "quantity": "m"}, "window_height": {"value": 1.975, "quantity": "m"}, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 8, "window_type": 1, "glazing_type": 2, "window_width": {"value": 1.166, "quantity": "m"}, "window_height": {"value": 1.463, "quantity": "m"}, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 4, "window_type": 1, "glazing_type": 2, "window_width": {"value": 1.701, "quantity": "m"}, "window_height": {"value": 1.975, "quantity": "m"}, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 4, "window_type": 1, "glazing_type": 2, "window_width": {"value": 1.143, "quantity": "m"}, "window_height": {"value": 1.217, "quantity": "m"}, "draught_proofed": "true", "window_location": 0, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 2, "window_type": 1, "glazing_type": 2, "window_width": {"value": 0.731, "quantity": "m"}, "window_height": {"value": 0.748, "quantity": "m"}, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 2, "window_type": 1, "glazing_type": 2, "window_width": {"value": 1.189, "quantity": "m"}, "window_height": {"value": 0.748, "quantity": "m"}, "draught_proofed": "true", "window_location": 2, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}, {"pvc_frame": "true", "orientation": 2, "window_type": 1, "glazing_type": 2, "window_width": {"value": 0.766, "quantity": "m"}, "window_height": {"value": 0.856, "quantity": "m"}, "draught_proofed": "true", "window_location": 1, "window_wall_type": 1, "permanent_shutters_present": "N", "permanent_shutters_insulated": "N"}], "schema_type": "RdSAP-Schema-21.0.1", "uprn_source": "Energy Assessor", "country_code": "ENG", "main_heating": [{"description": "Boiler and radiators, mains gas", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "air_tightness": {"description": "(not tested)", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "dwelling_type": "Mid-terrace house", "language_code": 1, "pressure_test": 4, "property_type": 0, "address_line_1": "58 Bournes Row", "address_line_2": "Hoghton", "assessment_type": "RdSAP", "completion_date": "2026-05-27", "inspection_date": "2026-05-27", "extensions_count": 2, "measurement_type": 1, "open_flues_count": 0, "total_floor_area": 117, "transaction_type": 1, "conservatory_type": 1, "heated_room_count": 4, "other_flues_count": 0, "registration_date": "2026-05-27", "sap_energy_source": {"mains_gas": "Y", "meter_type": 2, "pv_connection": 0, "photovoltaic_supply": {"none_or_no_details": {"percent_roof_area": 0}}, "wind_turbines_count": 0, "gas_smart_meter_present": "true", "is_dwelling_export_capable": "false", "wind_turbines_terrain_type": 2, "electricity_smart_meter_present": "true"}, "secondary_heating": {"description": "Room heaters, anthracite", "energy_efficiency_rating": 0, "environmental_efficiency_rating": 0}, "closed_flues_count": 1, "extract_fans_count": 0, "sap_building_parts": [{"identifier": "Main Dwelling", "wall_dry_lined": "N", "wall_thickness": 270, "floor_heat_loss": 7, "sap_room_in_roof": {"floor_area": 21.681, "room_in_roof_details": {"slope_height_1": 4.799, "slope_length_1": 1.468, "gable_wall_type_1": 2, "gable_wall_type_2": 1, "stud_wall_height_1": 4.799, "stud_wall_height_2": 1.9, "stud_wall_length_1": 1.323, "stud_wall_length_2": 4.799, "gable_wall_height_1": 2.25, "gable_wall_height_2": 2.25, "gable_wall_length_1": 4.518, "gable_wall_length_2": 4.518, "flat_ceiling_height_1": 4.799, "flat_ceiling_length_1": 3.383, "stud_wall_insulation_type_1": 0, "slope_insulation_thickness_1": "NI", "stud_wall_insulation_thickness_1": "100mm", "stud_wall_insulation_thickness_2": "AB", "flat_ceiling_insulation_thickness_1": "AB"}, "construction_age_band": "A"}, "roof_construction": 4, "wall_construction": 3, "building_part_number": 1, "sap_floor_dimensions": [{"floor": 0, "room_height": 2.723, "floor_insulation": 1, "total_floor_area": 38.683, "party_wall_length": 17.124, "floor_construction": 1, "heat_loss_perimeter": 6.88}, {"floor": 1, "room_height": 2.723, "total_floor_area": 38.683, "party_wall_length": 17.124, "heat_loss_perimeter": 6.88}], "wall_insulation_type": 4, "construction_age_band": "A", "party_wall_construction": 0, "wall_thickness_measured": "Y", "roof_insulation_location": 2, "roof_insulation_thickness": "100mm", "wall_insulation_thickness": "NI"}, {"identifier": "Extension 1", "wall_dry_lined": "N", "floor_heat_loss": 7, "roof_construction": 5, "wall_construction": 3, "building_part_number": 2, "sap_floor_dimensions": [{"floor": 0, "room_height": 2.18, "floor_insulation": 1, "total_floor_area": 5.46, "party_wall_length": 2.387, "floor_construction": 1, "heat_loss_perimeter": 2.387}, {"floor": 1, "room_height": 2.18, "total_floor_area": 5.46, "party_wall_length": 2.387, "heat_loss_perimeter": 4.543}], "wall_insulation_type": 4, "construction_age_band": "A", "party_wall_construction": 0, "wall_thickness_measured": "N", "roof_insulation_location": 4, "roof_insulation_thickness": "NI", "wall_insulation_thickness": "NI"}, {"identifier": "Extension 2", "wall_dry_lined": "N", "floor_heat_loss": 7, "roof_construction": 1, "wall_construction": 4, "building_part_number": 3, "sap_floor_dimensions": [{"floor": 0, "room_height": 2.18, "floor_insulation": 1, "total_floor_area": 7.155, "party_wall_length": 0, "floor_construction": 1, "heat_loss_perimeter": 8.794}], "wall_insulation_type": 4, "construction_age_band": "H", "party_wall_construction": "NA", "wall_thickness_measured": "N", "roof_insulation_location": 6, "wall_insulation_thickness": "NI", "flat_roof_insulation_thickness": "AB"}], "boilers_flues_count": 0, "open_chimneys_count": 0, "solar_water_heating": "N", "habitable_room_count": 4, "heating_cost_current": {"value": 1502, "currency": "GBP"}, "insulated_door_count": 0, "co2_emissions_current": 4.8, "energy_rating_average": 60, "energy_rating_current": 66, "lighting_cost_current": {"value": 70, "currency": "GBP"}, "main_heating_controls": [{"description": "Programmer, room thermostat and TRVs", "energy_efficiency_rating": 4, "environmental_efficiency_rating": 4}], "blocked_chimneys_count": 0, "has_hot_water_cylinder": "false", "heating_cost_potential": {"value": 1300, "currency": "GBP"}, "hot_water_cost_current": {"value": 212, "currency": "GBP"}, "mechanical_ventilation": 0, "percent_draughtproofed": 100, "schema_version_current": "LIG-21.0", "suggested_improvements": [{"sequence": 1, "typical_saving": 202, "indicative_cost": "\u00a37,500 - \u00a311,000", "improvement_type": "Q", "improvement_details": {"improvement_number": 7}, "improvement_category": 5, "energy_performance_rating": 70, "environmental_impact_rating": 63}, {"sequence": 2, "typical_saving": 266, "indicative_cost": "\u00a38,000 - \u00a310,000", "improvement_type": "U", "improvement_details": {"improvement_number": 34}, "improvement_category": 5, "energy_performance_rating": 78, "environmental_impact_rating": 65}], "co2_emissions_potential": 4.0, "energy_rating_potential": 78, "lighting_cost_potential": {"value": 70, "currency": "GBP"}, "schema_version_original": "LIG-21.0", "hot_water_cost_potential": {"value": 212, "currency": "GBP"}, "renewable_heat_incentive": {"water_heating": 2561.34, "space_heating_existing_dwelling": 15029.53}, "draughtproofed_door_count": 2, "energy_consumption_current": 203, "has_fixed_air_conditioning": "false", "multiple_glazed_proportion": 100, "calculation_software_version": "10.2.2.0", "energy_consumption_potential": 164, "environmental_impact_current": 58, "cfl_fixed_lighting_bulbs_count": 0, "current_energy_efficiency_band": "D", "environmental_impact_potential": 65, "led_fixed_lighting_bulbs_count": 23, "has_heated_separate_conservatory": "false", "potential_energy_efficiency_band": "C", "co2_emissions_current_per_floor_area": 41, "incandescent_fixed_lighting_bulbs_count": 0}
diff --git a/datatypes/epc/domain/epc_property_data.py b/datatypes/epc/domain/epc_property_data.py
index 4d158c7e..598139a8 100644
--- a/datatypes/epc/domain/epc_property_data.py
+++ b/datatypes/epc/domain/epc_property_data.py
@@ -6,7 +6,6 @@ from typing import Final, List, Optional, Union
 
 from datatypes.epc.domain.epc import Epc
 
-
 _API_EXTENSION = re.compile(r"^Extension\s+(\d+)$")
 
 
@@ -36,9 +35,7 @@ class BuildingPartIdentifier(Enum):
     OTHER = "other"
 
     @classmethod
-    def from_api_string(
-        cls, api_identifier: Optional[str]
-    ) -> "BuildingPartIdentifier":
+    def from_api_string(cls, api_identifier: Optional[str]) -> "BuildingPartIdentifier":
         """Map a gov-EPC API `BuildingPart.identifier` to its canonical
         member. "Main Dwelling" → MAIN; "Extension N" → EXTENSION_N
         (for N in 1..4). `None` (permitted by the 21_0_1 schema) and
@@ -76,6 +73,7 @@ class Addendum:
     Present on ~43% of real RdSAP certs (stone-walls / system-build / a list of
     numeric improvement codes the assessor wanted to call out).
     """
+
     stone_walls: Optional[bool] = None
     system_build: Optional[bool] = None
     addendum_numbers: Optional[List[int]] = None
@@ -184,10 +182,12 @@ class SapVentilation:
     flueless_gas_fires_count: Optional[int] = None
     ventilation_in_pcdf_database: Optional[bool] = None
     # SAP10.2 §2 cert lodgements not previously surfaced on this type.
-    sheltered_sides: Optional[int] = None              # (19) — cert assessor lodge, 0..4
+    sheltered_sides: Optional[int] = None  # (19) — cert assessor lodge, 0..4
     has_suspended_timber_floor: Optional[bool] = None  # (12) gate
     suspended_timber_floor_sealed: Optional[bool] = None
-    has_draught_lobby: Optional[bool] = None           # (13) gate (overrides .draught_lobby for §2 cascade)
+    has_draught_lobby: Optional[bool] = (
+        None  # (13) gate (overrides .draught_lobby for §2 cascade)
+    )
     # SAP 10.2 §2 (17a) — air permeability at 4 Pa from the low-pressure
     # Pulse pressure test, m³/h per m² of envelope area. When present the
     # cascade routes (18) via the AP4 formula `0.263 × AP4^0.924 + (8)`.
@@ -302,10 +302,11 @@ class PhotovoltaicArray:
     measured PV configuration; `photovoltaic_supply` carries the fallback
     `percent_roof_area` estimate when the surveyor could not confirm details.
     """
+
     peak_power: float
     pitch: int
-    orientation: int
     overshading: int
+    orientation: Optional[int] = None
 
 
 @dataclass
@@ -515,7 +516,9 @@ class SapBuildingPart:
     floor_u_value_known: Optional[bool] = None
 
     roof_construction: Optional[int] = None
-    roof_construction_type: Optional[str] = None  # str from site notes e.g. "PS Pitched, sloping ceiling"
+    roof_construction_type: Optional[str] = (
+        None  # str from site notes e.g. "PS Pitched, sloping ceiling"
+    )
     roof_insulation_location: Optional[Union[int, str]] = (
         None  # TODO: make enum/mapping?
     )
@@ -592,6 +595,7 @@ class RenewableHeatIncentive:
     baseline `space_heating_kwh` and `hot_water_kwh` for SAP10 properties (used as ML
     training targets per ADR-0007).
     """
+
     space_heating_kwh: float
     water_heating_kwh: float
     impact_of_loft_insulation_kwh: Optional[float] = None
diff --git a/datatypes/epc/domain/mapper.py b/datatypes/epc/domain/mapper.py
index bd6d61e9..f648badb 100644
--- a/datatypes/epc/domain/mapper.py
+++ b/datatypes/epc/domain/mapper.py
@@ -106,6 +106,19 @@ AnyRdSapSchema = Union[
 ]
 
 
+def _pv_orientation(field: Any) -> Optional[int]:
+    """A PV array's `orientation` is normally a 1-8 SAP octant code, but real
+    certs can lodge the RdSAP `ND` ("Not Defined") sentinel — and occasionally
+    `NA` — instead (e.g. one array on a multi-array dwelling). Map the sentinel
+    to None; downstream SAP solar code already treats an unmapped/None
+    orientation as a zero-generation array (see cert_to_inputs
+    `_pv_annual_s_kwh_per_m2`). Any real value is coerced via `_measurement_value`.
+    """
+    if field in ("ND", "NA"):
+        return None
+    return int(_measurement_value(field))
+
+
 def _map_schema_21_pv(
     es_pv_supply: Any,
 ) -> tuple[Optional[PhotovoltaicSupply], Optional[List[PhotovoltaicArray]]]:
@@ -127,7 +140,7 @@ def _map_schema_21_pv(
             PhotovoltaicArray(
                 peak_power=_measurement_value(array.peak_power),
                 pitch=int(_measurement_value(array.pitch)),
-                orientation=int(_measurement_value(array.orientation)),
+                orientation=_pv_orientation(array.orientation),
                 overshading=int(_measurement_value(array.overshading)),
             )
             for inner_list in es_pv_supply
@@ -143,7 +156,7 @@ def _map_schema_21_pv(
             PhotovoltaicArray(
                 peak_power=_measurement_value(array.peak_power),
                 pitch=int(_measurement_value(array.pitch)),
-                orientation=int(_measurement_value(array.orientation)),
+                orientation=_pv_orientation(array.orientation),
                 overshading=int(_measurement_value(array.overshading)),
             )
             for array in arrays_list
@@ -326,13 +339,16 @@ class EpcPropertyDataMapper:
             door_count=survey.door_count,
             sap_heating=_map_elmhurst_sap_heating(survey),
             sap_windows=[
-                _map_elmhurst_window(w) for w in survey.windows
+                _map_elmhurst_window(w)
+                for w in survey.windows
                 if not _is_elmhurst_roof_window(w, survey)
             ],
             sap_roof_windows=[
-                _map_elmhurst_roof_window(w) for w in survey.windows
+                _map_elmhurst_roof_window(w)
+                for w in survey.windows
                 if _is_elmhurst_roof_window(w, survey)
-            ] or None,
+            ]
+            or None,
             sap_energy_source=SapEnergySource(
                 mains_gas=survey.meters.main_gas,
                 meter_type=survey.meters.electricity_meter_type,
@@ -360,7 +376,8 @@ class EpcPropertyDataMapper:
                 ),
             ),
             sap_building_parts=_map_elmhurst_building_parts(
-                survey, is_flat=property_type.lower() == "flat",
+                survey,
+                is_flat=property_type.lower() == "flat",
             ),
             solar_water_heating=survey.renewables.solar_water_heating,
             solar_hw_collector_orientation=survey.renewables.solar_hw_collector_orientation,
@@ -423,7 +440,9 @@ class EpcPropertyDataMapper:
             ),
             any_unheated_rooms=survey.heated_habitable_rooms < survey.habitable_rooms,
             low_energy_fixed_lighting_bulbs_count=(
-                survey.lighting.low_energy_count if not survey.lighting.led_cfl_count_known else None
+                survey.lighting.low_energy_count
+                if not survey.lighting.led_cfl_count_known
+                else None
             ),
             energy_rating_current=survey.current_sap_rating,
             energy_rating_potential=survey.potential_sap_rating,
@@ -697,7 +716,8 @@ class EpcPropertyDataMapper:
                         bp.party_wall_construction
                     ),
                     sap_floor_dimensions=_api_build_sap_floor_dimensions(
-                        bp.sap_floor_dimensions or [], bp.floor_heat_loss,
+                        bp.sap_floor_dimensions or [],
+                        bp.floor_heat_loss,
                     ),
                     building_part_number=bp.building_part_number,
                     wall_dry_lined=bp.wall_dry_lined == "Y",
@@ -836,7 +856,8 @@ class EpcPropertyDataMapper:
                         bp.party_wall_construction
                     ),
                     sap_floor_dimensions=_api_build_sap_floor_dimensions(
-                        bp.sap_floor_dimensions or [], bp.floor_heat_loss,
+                        bp.sap_floor_dimensions or [],
+                        bp.floor_heat_loss,
                     ),
                     building_part_number=bp.building_part_number,
                     wall_dry_lined=bp.wall_dry_lined == "Y",
@@ -860,7 +881,8 @@ class EpcPropertyDataMapper:
                     # NI lodged) gets U=0.20 via the age-M 140 mm
                     # default; previously cascade returned U=1.05.
                     floor_insulation_thickness=(
-                        None if bp.floor_insulation_thickness == "NI"
+                        None
+                        if bp.floor_insulation_thickness == "NI"
                         else bp.floor_insulation_thickness
                     ),
                     flat_roof_insulation_thickness=bp.flat_roof_insulation_thickness,
@@ -1001,7 +1023,8 @@ class EpcPropertyDataMapper:
                         bp.party_wall_construction
                     ),
                     sap_floor_dimensions=_api_build_sap_floor_dimensions(
-                        bp.sap_floor_dimensions or [], bp.floor_heat_loss,
+                        bp.sap_floor_dimensions or [],
+                        bp.floor_heat_loss,
                     ),
                     building_part_number=bp.building_part_number,
                     wall_dry_lined=bp.wall_dry_lined == "Y",
@@ -1025,7 +1048,8 @@ class EpcPropertyDataMapper:
                     # NI lodged) gets U=0.20 via the age-M 140 mm
                     # default; previously cascade returned U=1.05.
                     floor_insulation_thickness=(
-                        None if bp.floor_insulation_thickness == "NI"
+                        None
+                        if bp.floor_insulation_thickness == "NI"
                         else bp.floor_insulation_thickness
                     ),
                     flat_roof_insulation_thickness=bp.flat_roof_insulation_thickness,
@@ -1183,7 +1207,8 @@ class EpcPropertyDataMapper:
                         bp.party_wall_construction
                     ),
                     sap_floor_dimensions=_api_build_sap_floor_dimensions(
-                        bp.sap_floor_dimensions or [], bp.floor_heat_loss,
+                        bp.sap_floor_dimensions or [],
+                        bp.floor_heat_loss,
                     ),
                     building_part_number=bp.building_part_number,
                     wall_dry_lined=bp.wall_dry_lined == "Y",
@@ -1207,7 +1232,8 @@ class EpcPropertyDataMapper:
                     # NI lodged) gets U=0.20 via the age-M 140 mm
                     # default; previously cascade returned U=1.05.
                     floor_insulation_thickness=(
-                        None if bp.floor_insulation_thickness == "NI"
+                        None
+                        if bp.floor_insulation_thickness == "NI"
                         else bp.floor_insulation_thickness
                     ),
                     flat_roof_insulation_thickness=bp.flat_roof_insulation_thickness,
@@ -1221,7 +1247,8 @@ class EpcPropertyDataMapper:
                     floor_type=_api_floor_type_str(bp.floor_heat_loss),
                     floor_construction_type=_api_floor_construction_str(
                         bp.sap_floor_dimensions[0].floor_construction
-                        if bp.sap_floor_dimensions else None
+                        if bp.sap_floor_dimensions
+                        else None
                     ),
                     roof_construction_type=_api_roof_construction_str(
                         bp.roof_construction
@@ -1234,7 +1261,9 @@ class EpcPropertyDataMapper:
                     ),
                     sap_room_in_roof=(
                         SapRoomInRoof(
-                            floor_area=_measurement_value(bp.sap_room_in_roof.floor_area),
+                            floor_area=_measurement_value(
+                                bp.sap_room_in_roof.floor_area
+                            ),
                             construction_age_band=bp.sap_room_in_roof.construction_age_band,
                         )
                         if bp.sap_room_in_roof
@@ -1268,7 +1297,9 @@ class EpcPropertyDataMapper:
             completion_date=date.fromisoformat(schema.completion_date),
             registration_date=date.fromisoformat(schema.registration_date),
             total_floor_area_m2=(
-                _per_bp_tfa if _per_bp_tfa is not None else float(schema.total_floor_area)
+                _per_bp_tfa
+                if _per_bp_tfa is not None
+                else float(schema.total_floor_area)
             ),
             solar_water_heating=schema.solar_water_heating == "Y",
             has_hot_water_cylinder=schema.has_hot_water_cylinder == "true",
@@ -1343,10 +1374,12 @@ class EpcPropertyDataMapper:
                 secondary_heating_type=schema.sap_heating.secondary_heating_type,
                 cylinder_insulation_thickness_mm=schema.sap_heating.cylinder_insulation_thickness,
                 electric_shower_count=_count_shower_outlets_by_type(
-                    schema.sap_heating.shower_outlets, _API_SHOWER_OUTLET_CODE_ELECTRIC,
+                    schema.sap_heating.shower_outlets,
+                    _API_SHOWER_OUTLET_CODE_ELECTRIC,
                 ),
                 mixer_shower_count=_count_shower_outlets_by_type(
-                    schema.sap_heating.shower_outlets, _API_SHOWER_OUTLET_CODE_MIXER,
+                    schema.sap_heating.shower_outlets,
+                    _API_SHOWER_OUTLET_CODE_MIXER,
                 ),
             ),
             sap_windows=[
@@ -1407,7 +1440,8 @@ class EpcPropertyDataMapper:
                         bp.party_wall_construction
                     ),
                     sap_floor_dimensions=_api_build_sap_floor_dimensions(
-                        bp.sap_floor_dimensions or [], bp.floor_heat_loss,
+                        bp.sap_floor_dimensions or [],
+                        bp.floor_heat_loss,
                     ),
                     building_part_number=bp.building_part_number,
                     wall_dry_lined=bp.wall_dry_lined == "Y",
@@ -1431,7 +1465,8 @@ class EpcPropertyDataMapper:
                     # NI lodged) gets U=0.20 via the age-M 140 mm
                     # default; previously cascade returned U=1.05.
                     floor_insulation_thickness=(
-                        None if bp.floor_insulation_thickness == "NI"
+                        None
+                        if bp.floor_insulation_thickness == "NI"
                         else bp.floor_insulation_thickness
                     ),
                     flat_roof_insulation_thickness=bp.flat_roof_insulation_thickness,
@@ -1445,7 +1480,8 @@ class EpcPropertyDataMapper:
                     floor_type=_api_floor_type_str(bp.floor_heat_loss),
                     floor_construction_type=_api_floor_construction_str(
                         bp.sap_floor_dimensions[0].floor_construction
-                        if bp.sap_floor_dimensions else None
+                        if bp.sap_floor_dimensions
+                        else None
                     ),
                     roof_construction_type=_api_roof_construction_str(
                         bp.roof_construction
@@ -1495,17 +1531,22 @@ class EpcPropertyDataMapper:
                 water_heating_kwh=float(schema.renewable_heat_incentive.water_heating),
                 impact_of_loft_insulation_kwh=(
                     float(schema.renewable_heat_incentive.impact_of_loft_insulation)
-                    if schema.renewable_heat_incentive.impact_of_loft_insulation is not None
+                    if schema.renewable_heat_incentive.impact_of_loft_insulation
+                    is not None
                     else None
                 ),
                 impact_of_cavity_insulation_kwh=(
                     float(schema.renewable_heat_incentive.impact_of_cavity_insulation)
-                    if schema.renewable_heat_incentive.impact_of_cavity_insulation is not None
+                    if schema.renewable_heat_incentive.impact_of_cavity_insulation
+                    is not None
                     else None
                 ),
                 impact_of_solid_wall_insulation_kwh=(
-                    float(schema.renewable_heat_incentive.impact_of_solid_wall_insulation)
-                    if schema.renewable_heat_incentive.impact_of_solid_wall_insulation is not None
+                    float(
+                        schema.renewable_heat_incentive.impact_of_solid_wall_insulation
+                    )
+                    if schema.renewable_heat_incentive.impact_of_solid_wall_insulation
+                    is not None
                     else None
                 ),
             ),
@@ -1535,7 +1576,9 @@ class EpcPropertyDataMapper:
             completion_date=date.fromisoformat(schema.completion_date),
             registration_date=date.fromisoformat(schema.registration_date),
             total_floor_area_m2=(
-                _per_bp_tfa if _per_bp_tfa is not None else float(schema.total_floor_area)
+                _per_bp_tfa
+                if _per_bp_tfa is not None
+                else float(schema.total_floor_area)
             ),
             # Property flags
             solar_water_heating=schema.solar_water_heating == "Y",
@@ -1622,10 +1665,12 @@ class EpcPropertyDataMapper:
                 number_baths=schema.sap_heating.number_baths,
                 number_baths_wwhrs=schema.sap_heating.number_baths_wwhrs,
                 electric_shower_count=_count_shower_outlets_by_type(
-                    schema.sap_heating.shower_outlets, _API_SHOWER_OUTLET_CODE_ELECTRIC,
+                    schema.sap_heating.shower_outlets,
+                    _API_SHOWER_OUTLET_CODE_ELECTRIC,
                 ),
                 mixer_shower_count=_count_shower_outlets_by_type(
-                    schema.sap_heating.shower_outlets, _API_SHOWER_OUTLET_CODE_MIXER,
+                    schema.sap_heating.shower_outlets,
+                    _API_SHOWER_OUTLET_CODE_MIXER,
                 ),
             ),
             # SAP windows — split vertical wall windows (27) from roof
@@ -1683,7 +1728,8 @@ class EpcPropertyDataMapper:
                         bp.party_wall_construction
                     ),
                     sap_floor_dimensions=_api_build_sap_floor_dimensions(
-                        bp.sap_floor_dimensions or [], bp.floor_heat_loss,
+                        bp.sap_floor_dimensions or [],
+                        bp.floor_heat_loss,
                     ),
                     building_part_number=bp.building_part_number,
                     wall_dry_lined=bp.wall_dry_lined == "Y",
@@ -1707,7 +1753,8 @@ class EpcPropertyDataMapper:
                     # NI lodged) gets U=0.20 via the age-M 140 mm
                     # default; previously cascade returned U=1.05.
                     floor_insulation_thickness=(
-                        None if bp.floor_insulation_thickness == "NI"
+                        None
+                        if bp.floor_insulation_thickness == "NI"
                         else bp.floor_insulation_thickness
                     ),
                     flat_roof_insulation_thickness=bp.flat_roof_insulation_thickness,
@@ -1721,7 +1768,8 @@ class EpcPropertyDataMapper:
                     floor_type=_api_floor_type_str(bp.floor_heat_loss),
                     floor_construction_type=_api_floor_construction_str(
                         bp.sap_floor_dimensions[0].floor_construction
-                        if bp.sap_floor_dimensions else None
+                        if bp.sap_floor_dimensions
+                        else None
                     ),
                     roof_construction_type=_api_roof_construction_str(
                         bp.roof_construction
@@ -1771,17 +1819,22 @@ class EpcPropertyDataMapper:
                 water_heating_kwh=float(schema.renewable_heat_incentive.water_heating),
                 impact_of_loft_insulation_kwh=(
                     float(schema.renewable_heat_incentive.impact_of_loft_insulation)
-                    if schema.renewable_heat_incentive.impact_of_loft_insulation is not None
+                    if schema.renewable_heat_incentive.impact_of_loft_insulation
+                    is not None
                     else None
                 ),
                 impact_of_cavity_insulation_kwh=(
                     float(schema.renewable_heat_incentive.impact_of_cavity_insulation)
-                    if schema.renewable_heat_incentive.impact_of_cavity_insulation is not None
+                    if schema.renewable_heat_incentive.impact_of_cavity_insulation
+                    is not None
                     else None
                 ),
                 impact_of_solid_wall_insulation_kwh=(
-                    float(schema.renewable_heat_incentive.impact_of_solid_wall_insulation)
-                    if schema.renewable_heat_incentive.impact_of_solid_wall_insulation is not None
+                    float(
+                        schema.renewable_heat_incentive.impact_of_solid_wall_insulation
+                    )
+                    if schema.renewable_heat_incentive.impact_of_solid_wall_insulation
+                    is not None
                     else None
                 ),
             ),
@@ -1807,10 +1860,16 @@ class EpcPropertyDataMapper:
             low_energy_fixed_lighting_outlets_count=schema.low_energy_fixed_lighting_outlets_count,
             addendum=(
                 Addendum(
-                    stone_walls=schema.addendum.stone_walls == "true"
-                    if schema.addendum.stone_walls is not None else None,
-                    system_build=schema.addendum.system_build == "true"
-                    if schema.addendum.system_build is not None else None,
+                    stone_walls=(
+                        schema.addendum.stone_walls == "true"
+                        if schema.addendum.stone_walls is not None
+                        else None
+                    ),
+                    system_build=(
+                        schema.addendum.system_build == "true"
+                        if schema.addendum.system_build is not None
+                        else None
+                    ),
                     addendum_numbers=schema.addendum.addendum_numbers,
                 )
                 if schema.addendum is not None
@@ -1825,7 +1884,9 @@ class EpcPropertyDataMapper:
             ),
             # Main-heating-controls EnergyElement (first control system if multiple).
             main_heating_controls=(
-                EpcPropertyDataMapper._map_energy_element(schema.main_heating_controls[0])
+                EpcPropertyDataMapper._map_energy_element(
+                    schema.main_heating_controls[0]
+                )
                 if schema.main_heating_controls
                 else None
             ),
@@ -1838,7 +1899,11 @@ class EpcPropertyDataMapper:
                     heat_loss_corridor=schema.sap_flat_details.heat_loss_corridor,
                     storey_count=schema.sap_flat_details.storey_count,
                     unheated_corridor_length_m=(
-                        int(_measurement_value(schema.sap_flat_details.unheated_corridor_length))
+                        int(
+                            _measurement_value(
+                                schema.sap_flat_details.unheated_corridor_length
+                            )
+                        )
                         if schema.sap_flat_details.unheated_corridor_length is not None
                         else None
                     ),
@@ -1942,6 +2007,15 @@ class EpcPropertyDataMapper:
                     from_dict(RdSapSchema21_0_0, data)
                 )
             )
+        if schema == "RdSAP-Schema-20.0.0":
+            from datatypes.epc.schema.rdsap_schema_20_0_0 import RdSapSchema20_0_0
+
+            return _clear_basement_flag_when_system_built(
+                EpcPropertyDataMapper.from_rdsap_schema_20_0_0(
+                    from_dict(RdSapSchema20_0_0, data)
+                )
+            )
+
         raise ValueError(f"Unsupported EPC schema: {schema!r}")
 
 
@@ -1993,8 +2067,10 @@ def _clear_basement_flag_when_system_built(
             part.wall_is_basement is None
             and part.wall_construction == BASEMENT_WALL_CONSTRUCTION_CODE
         )
-        if clear_main or new_alt_1 is not part.sap_alternative_wall_1 or (
-            new_alt_2 is not part.sap_alternative_wall_2
+        if (
+            clear_main
+            or new_alt_1 is not part.sap_alternative_wall_1
+            or (new_alt_2 is not part.sap_alternative_wall_2)
         ):
             changed = True
             new_parts.append(
@@ -2015,7 +2091,13 @@ def _clear_basement_flag_when_system_built(
 def _measurement_value(field: Any) -> float:
     """SAP measurements arrive as a `Measurement` (with `.value`), a raw dict
     {'value': N, 'quantity': '...'} when `from_dict` didn't coerce, or a plain
-    int/float (real-API certs). Coerce to float across all three shapes."""
+    int/float (real-API certs). Coerce to float across all three shapes.
+
+    Note: the `ND` ("Not Defined") sentinel is handled at the field level where
+    it actually occurs (PV `orientation`, via `_pv_orientation`) — NOT here.
+    Returning None from this shared coercer would leak into every measurement
+    field (floor area, window dims, ...) and crash the `int(...)` callers,
+    taking the whole PV-array list down with one missing orientation."""
     if hasattr(field, "value"):
         return float(field.value)
     if isinstance(field, dict) and "value" in field:
@@ -2147,14 +2229,16 @@ def _normalize_shower_outlets(data: Dict[str, Any]) -> Dict[str, Any]:
     if not isinstance(outlets, list) or not outlets:
         return data
     needs_rewrite = any(
-        isinstance(item, dict) and "shower_outlet" not in item
-        for item in outlets
+        isinstance(item, dict) and "shower_outlet" not in item for item in outlets
     )
     if not needs_rewrite:
         return data
     new_outlets: List[Dict[str, Any]] = [
-        item if isinstance(item, dict) and "shower_outlet" in item
-        else {"shower_outlet": item}
+        (
+            item
+            if isinstance(item, dict) and "shower_outlet" in item
+            else {"shower_outlet": item}
+        )
         for item in outlets
     ]
     new_sap_heating: Dict[str, Any] = {**sap_heating, "shower_outlets": new_outlets}
@@ -2182,7 +2266,8 @@ def _default_missing_post_town(data: Dict[str, Any]) -> Dict[str, Any]:
 
 
 def _count_shower_outlets_by_type(
-    schema_shower_outlets: Any, target_type: int,
+    schema_shower_outlets: Any,
+    target_type: int,
 ) -> Optional[int]:
     """Count how many outlets in the schema list lodge the given
     `shower_outlet_type` integer. Returns 0 when the schema field is
@@ -2235,35 +2320,35 @@ def _leading_code(value: str) -> str:
 # Elmhurst wall-type codes mapped to SAP10 wall_construction integers
 # (matches the constants defined in domain.sap10_ml.rdsap_uvalues).
 _ELMHURST_WALL_CODE_TO_SAP10: Dict[str, int] = {
-    "ST": 1,   # Stone (granite/sandstone) — placeholder; sandstone vs granite
-               # ambiguity resolved downstream via walls[].description.
-    "SG": 1,   # Stone: granite or whinstone (cert 000565 Ext1) — the
-               # granite-specific Elmhurst variant of "ST"; same SAP10
-               # WALL_STONE_GRANITE=1 cascade entry.
-    "SS": 2,   # Stone: sandstone or limestone (simulated case 5 / cert
-               # 0240 archetype) — SAP10 WALL_STONE_SANDSTONE=2. The
-               # sandstone-specific Elmhurst variant; the API path lodges
-               # the same wall as integer wall_construction=2.
-    "SB": 3,   # Solid brick (cohort cert lodgement)
-    "SO": 3,   # Solid brick (newer Elmhurst PDF variant — same SAP10
-               # mapping; cert 9501 lodges "SO Solid Brick" where the
-               # cohort lodges "SB Solid Brick")
-    "CA": 4,   # Cavity
-    "TF": 5,   # Timber frame
-    "TI": 5,   # Timber frame (Elmhurst's alt-wall code; same SAP10 mapping)
-    "SY": 6,   # System build — canonical RdSAP10 WALL_SYSTEM_BUILT=6.
-    "B":  6,   # Basement wall (cert 000565 Ext3+Ext4). Numerically
-               # collides with "SY" System build on code 6, so the
-               # basement vs system-built distinction is carried by the
-               # explicit `is_basement` / `wall_is_basement` flag (set
-               # via `_elmhurst_wall_is_basement`) rather than the code:
-               # only "B" triggers the cascade's `main_wall_is_basement`
-               # → RdSAP 10 §5.17 / Table 23 `u_basement_wall` override.
-               # "SY" sets the flag False so it routes through the normal
-               # `u_wall(construction=6)` system-built table instead.
-    "CO": 7,   # Cob
-    "PH": 8,   # Park home
-    "CW": 9,   # Curtain wall
+    "ST": 1,  # Stone (granite/sandstone) — placeholder; sandstone vs granite
+    # ambiguity resolved downstream via walls[].description.
+    "SG": 1,  # Stone: granite or whinstone (cert 000565 Ext1) — the
+    # granite-specific Elmhurst variant of "ST"; same SAP10
+    # WALL_STONE_GRANITE=1 cascade entry.
+    "SS": 2,  # Stone: sandstone or limestone (simulated case 5 / cert
+    # 0240 archetype) — SAP10 WALL_STONE_SANDSTONE=2. The
+    # sandstone-specific Elmhurst variant; the API path lodges
+    # the same wall as integer wall_construction=2.
+    "SB": 3,  # Solid brick (cohort cert lodgement)
+    "SO": 3,  # Solid brick (newer Elmhurst PDF variant — same SAP10
+    # mapping; cert 9501 lodges "SO Solid Brick" where the
+    # cohort lodges "SB Solid Brick")
+    "CA": 4,  # Cavity
+    "TF": 5,  # Timber frame
+    "TI": 5,  # Timber frame (Elmhurst's alt-wall code; same SAP10 mapping)
+    "SY": 6,  # System build — canonical RdSAP10 WALL_SYSTEM_BUILT=6.
+    "B": 6,  # Basement wall (cert 000565 Ext3+Ext4). Numerically
+    # collides with "SY" System build on code 6, so the
+    # basement vs system-built distinction is carried by the
+    # explicit `is_basement` / `wall_is_basement` flag (set
+    # via `_elmhurst_wall_is_basement`) rather than the code:
+    # only "B" triggers the cascade's `main_wall_is_basement`
+    # → RdSAP 10 §5.17 / Table 23 `u_basement_wall` override.
+    # "SY" sets the flag False so it routes through the normal
+    # `u_wall(construction=6)` system-built table instead.
+    "CO": 7,  # Cob
+    "PH": 8,  # Park home
+    "CW": 9,  # Curtain wall
 }
 
 
@@ -2276,14 +2361,14 @@ _ELMHURST_WALL_CODE_TO_SAP10: Dict[str, int] = {
 # default. Cert 0380's `walls.insulation = "FE Filled Cavity + External"`
 # is the cohort fixture pinning the FE branch.
 _ELMHURST_INSULATION_CODE_TO_SAP10: Dict[str, int] = {
-    "E": 1,    # External wall insulation
-    "F": 2,    # Filled cavity
-    "I": 3,    # Internal wall insulation
-    "A": 4,    # As built / assumed (default cascade)
-    "N": 5,    # None specified
-    "FE": 6,   # Filled cavity + external insulation (cohort: cert 0380)
-    "FI": 7,   # Filled cavity + internal insulation (no fixture yet —
-               # mirror of FE for the internal-upgrade variant)
+    "E": 1,  # External wall insulation
+    "F": 2,  # Filled cavity
+    "I": 3,  # Internal wall insulation
+    "A": 4,  # As built / assumed (default cascade)
+    "N": 5,  # None specified
+    "FE": 6,  # Filled cavity + external insulation (cohort: cert 0380)
+    "FI": 7,  # Filled cavity + internal insulation (no fixture yet —
+    # mirror of FE for the internal-upgrade variant)
 }
 
 
@@ -2333,12 +2418,12 @@ def _elmhurst_dwelling_type(
 # codes. NR ("Non-residential space above") is intentionally left
 # unmapped — the gov enum's code 7 is specifically "dwelling above".
 _ELMHURST_ROOF_CODE_TO_SAP10: Dict[str, int] = {
-    "F": 1,    # Flat
-    "PN": 3,   # Pitched (slates/tiles), no access (to loft)
-    "PA": 4,   # Pitched (slates/tiles), access to loft
-    "PS": 8,   # Pitched, sloping ceiling
-    "S": 7,    # Same dwelling above
-    "A": 7,    # Another dwelling above
+    "F": 1,  # Flat
+    "PN": 3,  # Pitched (slates/tiles), no access (to loft)
+    "PA": 4,  # Pitched (slates/tiles), access to loft
+    "PS": 8,  # Pitched, sloping ceiling
+    "S": 7,  # Same dwelling above
+    "A": 7,  # Another dwelling above
 }
 
 
@@ -2409,17 +2494,17 @@ def _elmhurst_wall_is_basement(coded: str) -> Optional[bool]:
 # resolves via that domain (3 Solid Brick / 5 Timber / 6 System Build
 # all → U=0.0; unknown → U=0.25).
 _ELMHURST_PARTY_WALL_CODE_TO_SAP10: Dict[str, int] = {
-    "S": 3,   # Solid masonry / timber / system build → U=0.0
-    "C": 4,   # Cavity (unfilled) → U=0.5
+    "S": 3,  # Solid masonry / timber / system build → U=0.0
+    "C": 4,  # Cavity (unfilled) → U=0.5
     "CU": 4,  # Cavity masonry unfilled — same U=0.5 cascade; Elmhurst
-              # encodes party-wall cavity type with the masonry sub-code
-              # (CU vs CF filled) — observed first on cert 001479 Main.
-    "CF": 11, # Cavity masonry filled (cert 000565 Ext1) — RdSAP 10
-              # §5.10 Table 15 row 3 (PDF p.42) spec U=0.20. Routes via
-              # the synthetic `WALL_CAVITY_FILLED_PARTY=11` code that
-              # `u_party_wall` resolves to 0.2 (slice S0380.91). Code 11
-              # is party-wall-only and never appears as a main wall
-              # `wall_construction` so `u_wall` is unaffected.
+    # encodes party-wall cavity type with the masonry sub-code
+    # (CU vs CF filled) — observed first on cert 001479 Main.
+    "CF": 11,  # Cavity masonry filled (cert 000565 Ext1) — RdSAP 10
+    # §5.10 Table 15 row 3 (PDF p.42) spec U=0.20. Routes via
+    # the synthetic `WALL_CAVITY_FILLED_PARTY=11` code that
+    # `u_party_wall` resolves to 0.2 (slice S0380.91). Code 11
+    # is party-wall-only and never appears as a main wall
+    # `wall_construction` so `u_wall` is unaffected.
     # "U Unable to determine" — the cohort's modal lodgement. The cohort
     # hand-built convention uses 0 as the explicit "unknown" sentinel
     # (rather than None) so cross-mapper field parity is preserved; the
@@ -2496,8 +2581,8 @@ class UnmappedApiCode(ValueError):
 # party wall) maps to None.
 _API_PARTY_WALL_CONSTRUCTION_TO_SAP10: Dict[int, Optional[int]] = {
     0: None,
-    1: 3,   # Solid masonry / timber / system → U=0.0
-    2: 4,   # Cavity masonry unfilled → U=0.5
+    1: 3,  # Solid masonry / timber / system → U=0.0
+    2: 4,  # Cavity masonry unfilled → U=0.5
     3: 11,  # Cavity masonry filled → U=0.2 (WALL_CAVITY_FILLED_PARTY)
     4: None,  # Unable to determine, house — cascade default 0.25
     5: None,  # Unable to determine, flat — TODO: u_party_wall=0.0 path
@@ -2802,20 +2887,20 @@ def _api_sheltered_sides(built_form: object) -> Optional[int]:
 # is lodged, falling back to the type-only default for missing gaps.
 _API_GLAZING_TYPE_TO_TRANSMISSION: Dict[int, tuple[float, float, float]] = {
     # (u_value, solar_transmittance/g_⊥, frame_factor)
-    1: (2.8, 0.76, 0.70),    # Double glazed, pre-2002 / unknown install
-                             # date — Table 24 row 2 (PVC/wooden), 12mm
-                             # gap default. Schema sibling of code 3.
-    2: (2.0, 0.72, 0.70),    # Double glazed, England/Wales 2002+ (pre-2022)
-    3: (2.8, 0.76, 0.70),    # Double glazed, pre-2002 (12mm gap default)
-    13: (1.4, 0.72, 0.70),   # Double glazed, Argon-filled post-2022
-    14: (1.4, 0.72, 0.70),   # Double or triple glazed, post-2022
-                             # (Table 24 last row: 2022+ E/W / 2023+ Sc
-                             # / 2022+ NI — same U/g as code 13 per
-                             # spec; the integer codes 13/14 are
-                             # schema siblings within the post-2022
-                             # product family. Cert 0380 lodges code
-                             # 14 on all windows; worksheet uses U=1.4
-                             # = post-curtain 1.3258.)
+    1: (2.8, 0.76, 0.70),  # Double glazed, pre-2002 / unknown install
+    # date — Table 24 row 2 (PVC/wooden), 12mm
+    # gap default. Schema sibling of code 3.
+    2: (2.0, 0.72, 0.70),  # Double glazed, England/Wales 2002+ (pre-2022)
+    3: (2.8, 0.76, 0.70),  # Double glazed, pre-2002 (12mm gap default)
+    13: (1.4, 0.72, 0.70),  # Double glazed, Argon-filled post-2022
+    14: (1.4, 0.72, 0.70),  # Double or triple glazed, post-2022
+    # (Table 24 last row: 2022+ E/W / 2023+ Sc
+    # / 2022+ NI — same U/g as code 13 per
+    # spec; the integer codes 13/14 are
+    # schema siblings within the post-2022
+    # product family. Cert 0380 lodges code
+    # 14 on all windows; worksheet uses U=1.4
+    # = post-curtain 1.3258.)
 }
 
 
@@ -2829,17 +2914,18 @@ _API_GLAZING_TYPE_GAP_TO_TRANSMISSION: Dict[
 ] = {
     # Double glazed, pre-2002 / unknown install date — Table 24 row 2
     # (PVC/wooden frame). Codes 1 and 3 alias the same Table 24 row:
-    (1, 6):     (3.1, 0.76, 0.70),
-    (1, 12):    (2.8, 0.76, 0.70),
+    (1, 6): (3.1, 0.76, 0.70),
+    (1, 12): (2.8, 0.76, 0.70),
     (1, "16+"): (2.7, 0.76, 0.70),
-    (3, 6):     (3.1, 0.76, 0.70),
-    (3, 12):    (2.8, 0.76, 0.70),
+    (3, 6): (3.1, 0.76, 0.70),
+    (3, 12): (2.8, 0.76, 0.70),
     (3, "16+"): (2.7, 0.76, 0.70),
 }
 
 
 def _api_glazing_transmission(
-    glazing_type: Optional[int], glazing_gap: object,
+    glazing_type: Optional[int],
+    glazing_gap: object,
 ) -> Optional[tuple[float, float, float]]:
     """Resolve (U, g, frame_factor) for an API window. Per-gap override
     takes precedence over the type-only default; returns None when the
@@ -2902,7 +2988,9 @@ _API_SECONDARY_HEATING_SPEC_FUEL: Dict[int, int] = {
 
 # Table 32 electric fuel codes — copied here (not imported from
 # cert_to_inputs) to keep mapper as a leaf module.
-_API_ELECTRIC_FUEL_CODES: frozenset[int] = frozenset({30, 31, 32, 33, 34, 35, 36, 38, 39, 40})
+_API_ELECTRIC_FUEL_CODES: frozenset[int] = frozenset(
+    {30, 31, 32, 33, 34, 35, 36, 38, 39, 40}
+)
 
 
 def _api_secondary_fuel_type(
@@ -2957,7 +3045,8 @@ def _api_sap_roof_window(w: Any) -> SapRoofWindow:
     if frame_factor is None:
         frame_factor = transmission[2] if transmission is not None else 0.70
     return SapRoofWindow(
-        area_m2=_measurement_value(w.window_width) * _measurement_value(w.window_height),
+        area_m2=_measurement_value(w.window_width)
+        * _measurement_value(w.window_height),
         u_value_raw=vertical_u + _ELMHURST_ROOF_WINDOW_INCLINATION_ADJUSTMENT_W_PER_M2K,
         orientation=w.orientation,
         pitch_deg=45.0,
@@ -3034,24 +3123,24 @@ def _api_build_sap_floor_dimensions(
        fixture convention.
     """
     is_exposed = floor_heat_loss == _API_FLOOR_HEAT_LOSS_EXPOSED
-    is_above_partial = (
-        floor_heat_loss == _API_FLOOR_HEAT_LOSS_ABOVE_PARTIALLY_HEATED
-    )
+    is_above_partial = floor_heat_loss == _API_FLOOR_HEAT_LOSS_ABOVE_PARTIALLY_HEATED
     out: List[SapFloorDimension] = []
     for fd in fds or []:
         raw_height = _measurement_value(fd.room_height)
         height = raw_height if fd.floor == 0 else raw_height + _UPPER_FLOOR_HEIGHT_ADD_M
-        out.append(SapFloorDimension(
-            room_height_m=height,
-            total_floor_area_m2=_measurement_value(fd.total_floor_area),
-            party_wall_length_m=_measurement_value(fd.party_wall_length),
-            heat_loss_perimeter_m=_measurement_value(fd.heat_loss_perimeter),
-            floor=fd.floor,
-            floor_insulation=fd.floor_insulation,
-            floor_construction=fd.floor_construction,
-            is_exposed_floor=is_exposed and fd.floor == 0,
-            is_above_partially_heated_space=is_above_partial and fd.floor == 0,
-        ))
+        out.append(
+            SapFloorDimension(
+                room_height_m=height,
+                total_floor_area_m2=_measurement_value(fd.total_floor_area),
+                party_wall_length_m=_measurement_value(fd.party_wall_length),
+                heat_loss_perimeter_m=_measurement_value(fd.heat_loss_perimeter),
+                floor=fd.floor,
+                floor_insulation=fd.floor_insulation,
+                floor_construction=fd.floor_construction,
+                is_exposed_floor=is_exposed and fd.floor == 0,
+                is_above_partially_heated_space=is_above_partial and fd.floor == 0,
+            )
+        )
     return out
 
 
@@ -3119,16 +3208,16 @@ def _api_type_1_gable_surfaces(
         surfaces.append(
             SapRoomInRoofSurface(
                 kind=_api_type_1_gable_kind(gable_type),
-                area_m2=_round_half_up_2dp(
-                    float(length), _RIR_TYPE_1_GABLE_HEIGHT_M
-                ),
+                area_m2=_round_half_up_2dp(float(length), _RIR_TYPE_1_GABLE_HEIGHT_M),
             )
         )
     return surfaces or None
 
 
 def _api_build_room_in_roof(
-    bp_rir: Any, *, is_flat: bool = False,
+    bp_rir: Any,
+    *,
+    is_flat: bool = False,
 ) -> Optional[SapRoomInRoof]:
     """Build `SapRoomInRoof` from the API schema's per-bp RR block. Two
     real-API shapes coexist:
@@ -3172,7 +3261,9 @@ def _api_build_room_in_roof(
 
 
 def _api_rir_detailed_surfaces(
-    details: Any, *, is_flat: bool,
+    details: Any,
+    *,
+    is_flat: bool,
 ) -> Optional[List[SapRoomInRoofSurface]]:
     """Translate the API `room_in_roof_details` block into the per-surface
     list the cascade's Detailed-RR branch consumes.
@@ -3330,7 +3421,8 @@ _PRE_1950_AGE_CODES: Final[frozenset[str]] = frozenset({"A", "B", "C", "D"})
 
 
 def _resolve_sloping_ceiling_thickness(
-    roof: ElmhurstRoofDetails, age_code: str,
+    roof: ElmhurstRoofDetails,
+    age_code: str,
 ) -> Optional[int]:
     """Map an Elmhurst sloping-ceiling roof (`PS Pitched, sloping ceiling`)
     with no lodged thickness ("As Built") to an explicit 0 mm for pre-
@@ -3557,6 +3649,7 @@ def _map_elmhurst_building_part(
 ) -> SapBuildingPart:
     """Build a `SapBuildingPart` from one bp's worth of Elmhurst site-
     notes data. `identifier` distinguishes Main from each extension."""
+
     # Sort floors so the lowest is floor=0 and each upper floor follows.
     # Elmhurst lists floors top-to-bottom in the PDF ("1st Floor" before
     # "Lowest Floor"); SAP convention puts the ground floor first. The
@@ -3566,6 +3659,7 @@ def _map_elmhurst_building_part(
     # cascade treats those as a real storey otherwise.
     def _is_lowest(name: str) -> bool:
         return "lowest" in name.lower()
+
     populated_floors = [f for f in dimensions.floors if f.area_m2 > 0]
     ordered = sorted(
         populated_floors,
@@ -3578,7 +3672,9 @@ def _map_elmhurst_building_part(
         # SAP convention adds 0.25 m to non-ground room heights for the
         # joist/floor-void contribution; the ground floor uses the
         # lodged value directly.
-        height = f.room_height_m if i == 0 else f.room_height_m + _UPPER_FLOOR_HEIGHT_ADD_M
+        height = (
+            f.room_height_m if i == 0 else f.room_height_m + _UPPER_FLOOR_HEIGHT_ADD_M
+        )
         # `is_exposed_floor` / `is_above_partially_heated_space` only
         # apply to the ground floor of a bp sitting above unheated /
         # partially-heated space (e.g. an extension over a non-domestic
@@ -3610,7 +3706,9 @@ def _map_elmhurst_building_part(
         wall_is_basement=_elmhurst_wall_is_basement(walls.wall_type),
         wall_insulation_type=_elmhurst_wall_insulation_int(walls.insulation),
         wall_thickness_measured=not walls.thickness_unknown,
-        party_wall_construction=_elmhurst_party_wall_construction_int(walls.party_wall_type),
+        party_wall_construction=_elmhurst_party_wall_construction_int(
+            walls.party_wall_type
+        ),
         sap_floor_dimensions=floor_dims,
         wall_thickness_mm=walls.thickness_mm,
         # API mapper lodges wall_insulation_thickness as the string
@@ -3626,7 +3724,8 @@ def _map_elmhurst_building_part(
         roof_construction_type=_strip_code(roof.roof_type),
         roof_insulation_location=_strip_code(roof.insulation),
         roof_insulation_thickness=_resolve_sloping_ceiling_thickness(
-            roof, age_code,
+            roof,
+            age_code,
         ),
         floor_type=_strip_code(floor.location),
         floor_construction_type=_strip_code(floor.floor_type),
@@ -3677,7 +3776,9 @@ def _map_elmhurst_alternative_wall(
     alt-wall insulation thickness is always None on this path.
     """
     measured_thickness_mm = (
-        a.thickness_mm if (not a.thickness_unknown and a.thickness_mm is not None) else None
+        a.thickness_mm
+        if (not a.thickness_unknown and a.thickness_mm is not None)
+        else None
     )
     return SapAlternativeWall(
         wall_area=a.area_m2,
@@ -3702,7 +3803,9 @@ _EXTENSION_IDENTIFIERS: tuple[BuildingPartIdentifier, ...] = (
 
 
 def _map_elmhurst_building_parts(
-    survey: ElmhurstSiteNotes, *, is_flat: bool = False,
+    survey: ElmhurstSiteNotes,
+    *,
+    is_flat: bool = False,
 ) -> List[SapBuildingPart]:
     """Produce a list of `SapBuildingPart` covering the main dwelling plus
     each lodged extension. Empty `survey.extensions` collapses to a
@@ -3719,7 +3822,9 @@ def _map_elmhurst_building_parts(
             walls=survey.walls,
             roof=survey.roof,
             floor=survey.floor,
-            room_in_roof=_map_elmhurst_room_in_roof(survey.room_in_roof, is_flat=is_flat),
+            room_in_roof=_map_elmhurst_room_in_roof(
+                survey.room_in_roof, is_flat=is_flat
+            ),
         )
     ]
     for ext, identifier in zip(survey.extensions, _EXTENSION_IDENTIFIERS):
@@ -3732,7 +3837,8 @@ def _map_elmhurst_building_parts(
                 roof=ext.roof,
                 floor=ext.floor,
                 room_in_roof=_map_elmhurst_room_in_roof(
-                    ext.room_in_roof, is_flat=is_flat,
+                    ext.room_in_roof,
+                    is_flat=is_flat,
                 ),
             )
         )
@@ -3862,9 +3968,7 @@ def _map_elmhurst_rir_surface(
         length_m, height_m = surface.length_m, surface.height_m
         if is_simplified and common_wall_heights:
             correction = sum(
-                ((height_m - h) ** 2) / 2.0
-                for h in common_wall_heights
-                if height_m > h
+                ((height_m - h) ** 2) / 2.0 for h in common_wall_heights if height_m > h
             )
             area_m2 = _round_half_up_2dp(
                 1.0, max(0.0, length_m * (0.25 + height_m) - correction)
@@ -3949,11 +4053,7 @@ def _map_elmhurst_rir_surface(
         # else: flat with Exposed gable — preserve the legacy no-override
         # path so the cascade falls through to main-wall U (`uw` in
         # heat_transmission.py). Matches cert 9501.
-    elif (
-        kind == "gable_wall"
-        and surface.gable_type is None
-        and is_flat
-    ):
+    elif kind == "gable_wall" and surface.gable_type is None and is_flat:
         # Flat with un-typed gable (pre-S0380.83 extractor data shape):
         # route external with no override. Same final cascade output
         # as the "Exposed" + is_flat branch above.
@@ -3982,13 +4082,8 @@ def _map_elmhurst_rir_surface(
         # loop skips `walls += u × area` and `party += 0.25 × area`
         # when area is negative.
         length_m, height_m = surface.length_m, surface.height_m
-        correction = sum(
-            ((height_m - h) ** 2) / 2.0
-            for h in common_wall_heights
-        )
-        area_m2 = _round_half_up_2dp(
-            1.0, length_m * (0.25 + height_m) - correction
-        )
+        correction = sum(((height_m - h) ** 2) / 2.0 for h in common_wall_heights)
+        area_m2 = _round_half_up_2dp(1.0, length_m * (0.25 + height_m) - correction)
     else:
         area_m2 = _round_half_up_2dp(surface.length_m, surface.height_m)
     if kind in ("gable_wall", "gable_wall_external"):
@@ -4002,8 +4097,12 @@ def _map_elmhurst_rir_surface(
     return SapRoomInRoofSurface(
         kind=kind,
         area_m2=area_m2,
-        insulation_thickness_mm=_elmhurst_rir_insulation_thickness_mm(surface.insulation),
-        insulation_type=_RIR_INSULATION_TYPE_TO_SAP10.get(surface.insulation_type or ""),
+        insulation_thickness_mm=_elmhurst_rir_insulation_thickness_mm(
+            surface.insulation
+        ),
+        insulation_type=_RIR_INSULATION_TYPE_TO_SAP10.get(
+            surface.insulation_type or ""
+        ),
     )
 
 
@@ -4032,15 +4131,15 @@ def _map_elmhurst_room_in_roof(
     common_wall_heights = [
         s.height_m
         for s in rir.surfaces
-        if s.name.startswith("Common Wall")
-        and s.length_m > 0
-        and s.height_m > 0
+        if s.name.startswith("Common Wall") and s.length_m > 0 and s.height_m > 0
     ]
     is_simplified = rir.assessment.startswith("Simplified")
     detailed = [
-        s for s in (
+        s
+        for s in (
             _map_elmhurst_rir_surface(
-                s, is_flat=is_flat,
+                s,
+                is_flat=is_flat,
                 is_simplified=is_simplified,
                 common_wall_heights=common_wall_heights,
             )
@@ -4060,7 +4159,7 @@ def _map_elmhurst_room_in_roof(
 # FACTOR). Strings are the §19.0 PV-block values lodged by the Elmhurst
 # Summary PDF; lower-cased for case-insensitive matching.
 _ELMHURST_PV_OVERSHADING_TO_RDSAP: Dict[str, int] = {
-    "none or little": 1,    # SAP "None or very little" — ZPV=1.0
+    "none or little": 1,  # SAP "None or very little" — ZPV=1.0
     "none or very little": 1,
     "modest": 2,
     "significant": 3,
@@ -4103,7 +4202,11 @@ def _elmhurst_pv_arrays(
 # flux cascade). Elmhurst lodges the actual degrees value
 # ("Elevation: 45°"); the cascade reads the integer code.
 _ELMHURST_PV_PITCH_DEG_TO_CODE: Dict[int, int] = {
-    0: 1, 30: 2, 45: 3, 60: 4, 90: 5,
+    0: 1,
+    30: 2,
+    45: 3,
+    60: 4,
+    90: 5,
 }
 
 
@@ -4134,13 +4237,20 @@ def _elmhurst_pv_overshading_int(description: Optional[str]) -> int:
 # single-direction ("East") and combined ("North-West") forms.
 _ELMHURST_ORIENTATION_TO_SAP10: Dict[str, int] = {
     "North": 1,
-    "North-East": 2, "NE": 2,
+    "North-East": 2,
+    "NE": 2,
     "East": 3,
-    "South-East": 4, "SE": 4, "East-South": 4,
+    "South-East": 4,
+    "SE": 4,
+    "East-South": 4,
     "South": 5,
-    "South-West": 6, "SW": 6, "West-South": 6,
+    "South-West": 6,
+    "SW": 6,
+    "West-South": 6,
     "West": 7,
-    "North-West": 8, "NW": 8, "West-North": 8,
+    "North-West": 8,
+    "NW": 8,
+    "West-North": 8,
 }
 
 
@@ -4174,7 +4284,8 @@ _ELMHURST_BP_ROOF_TYPES_WITH_ROOFLIGHTS: Final[tuple[str, ...]] = ("A ", "NR ")
 
 
 def _elmhurst_bp_roof_type(
-    w: ElmhurstWindow, survey: ElmhurstSiteNotes,
+    w: ElmhurstWindow,
+    survey: ElmhurstSiteNotes,
 ) -> Optional[str]:
     """Look up the lodged §8 roof type for the BP carrying window `w`.
     Returns None when the BP isn't found (single-bp cert with no
@@ -4189,7 +4300,8 @@ def _elmhurst_bp_roof_type(
 
 
 def _elmhurst_bp_has_room_in_roof(
-    w: ElmhurstWindow, survey: ElmhurstSiteNotes,
+    w: ElmhurstWindow,
+    survey: ElmhurstSiteNotes,
 ) -> bool:
     """Whether the building part carrying window `w` has a room-in-roof — a
     sloping-ceiling structure that can host an inclined rooflight. Gates the
@@ -4204,7 +4316,8 @@ def _elmhurst_bp_has_room_in_roof(
 
 
 def _is_elmhurst_roof_window(
-    w: ElmhurstWindow, survey: ElmhurstSiteNotes,
+    w: ElmhurstWindow,
+    survey: ElmhurstSiteNotes,
 ) -> bool:
     """Reconstruct RdSAP 10 §3.7.1 "Window (vertical) vs Roof window
     (inclined)" classification from Elmhurst Summary §11.0 fields,
@@ -4451,8 +4564,7 @@ def _resolve_elmhurst_underfloor_subtype(
     age_letter = main_age_band[0] if main_age_band else ""
     is_solid = floor_type.startswith("S Solid") or floor_type == "Solid"
     is_suspended_timber = (
-        floor_type.startswith("T Suspended timber")
-        or floor_type == "Suspended timber"
+        floor_type.startswith("T Suspended timber") or floor_type == "Suspended timber"
     )
     is_suspended_not_timber = (
         floor_type.startswith("N Suspended, not timber")
@@ -4488,7 +4600,11 @@ def _elmhurst_heat_emitter_int(
         return _ELMHURST_HEAT_EMITTER_TO_SAP10[emitter]
     # RdSAP 10 §10.11 Table 29 (p.56): bare "Underfloor heating" lodging
     # derives subtype from main floor construction + age band.
-    if emitter == "Underfloor Heating" and main_floor is not None and main_age_band is not None:
+    if (
+        emitter == "Underfloor Heating"
+        and main_floor is not None
+        and main_age_band is not None
+    ):
         return _resolve_elmhurst_underfloor_subtype(main_floor, main_age_band)
     return None
 
@@ -4632,12 +4748,14 @@ def _elmhurst_sap_control_code(sap_control: str) -> Optional[int]:
 # fixture exercises them.
 _ELMHURST_HEATING_CATEGORY_GAS_BOILER: Final[int] = 2
 _ELMHURST_HEATING_CATEGORY_HEAT_PUMP: Final[int] = 4
-_ELMHURST_GAS_BOILER_FUEL_TYPES: frozenset[str] = frozenset({
-    "Mains gas",
-    "LPG bottled",
-    "LPG bulk",
-    "LPG special condition",
-})
+_ELMHURST_GAS_BOILER_FUEL_TYPES: frozenset[str] = frozenset(
+    {
+        "Mains gas",
+        "LPG bottled",
+        "LPG bulk",
+        "LPG special condition",
+    }
+)
 
 # Standard-electricity Table 32 fuel code. SAP 10.2 Table 12 lists
 # this as code 30 = "Electricity, standard tariff" — the fuel-cost /
@@ -4680,9 +4798,7 @@ _ELECTRIC_SAP_MAIN_HEATING_CODES: Final[frozenset[int]] = frozenset(
 #             Main 1 lodging)
 #   521-527 — warm-air heat pumps
 _HEAT_PUMP_SAP_MAIN_HEATING_CODES: Final[frozenset[int]] = frozenset(
-    list(range(211, 218))
-    + list(range(221, 228))
-    + list(range(521, 528))
+    list(range(211, 218)) + list(range(221, 228)) + list(range(521, 528))
 )
 
 # SAP 10.2 Table 4b liquid-fuel-boiler code range. Table 4b carries
@@ -4696,8 +4812,8 @@ _HEAT_PUMP_SAP_MAIN_HEATING_CODES: Final[frozenset[int]] = frozenset(
 # fallback in `_map_elmhurst_sap_heating` so it can't accidentally
 # fire on solid-fuel-mains + electric-HW certs (where §15.0 would
 # wrongly populate the SH fuel).
-_LIQUID_FUEL_BOILER_SAP_MAIN_HEATING_CODES: Final[frozenset[int]] = (
-    frozenset(range(120, 142))
+_LIQUID_FUEL_BOILER_SAP_MAIN_HEATING_CODES: Final[frozenset[int]] = frozenset(
+    range(120, 142)
 )
 
 # SAP 10.2 Table 4b gas-boiler code range (PDF p.168). Rows 101-119 are
@@ -4713,9 +4829,7 @@ _LIQUID_FUEL_BOILER_SAP_MAIN_HEATING_CODES: Final[frozenset[int]] = (
 # so it disambiguates mains-gas-vs-LPG. Codes 120-141 (CPSU + range
 # cookers) are already covered by
 # `_LIQUID_FUEL_BOILER_SAP_MAIN_HEATING_CODES`.
-_GAS_BOILER_SAP_MAIN_HEATING_CODES: Final[frozenset[int]] = (
-    frozenset(range(101, 120))
-)
+_GAS_BOILER_SAP_MAIN_HEATING_CODES: Final[frozenset[int]] = frozenset(range(101, 120))
 
 # SAP10 main-fuel codes in the gas / LPG family — the only carriers a
 # Table 4b gas-boiler row (101-119) can have (mains gas, mains gas
@@ -4890,7 +5004,8 @@ _ELMHURST_COMMUNITY_BOILER_FUEL_TO_TABLE_12: Final[dict[str, int]] = {
 
 
 def _resolve_community_heating_fuel_code(
-    heat_source: str, community_fuel: str,
+    heat_source: str,
+    community_fuel: str,
 ) -> Optional[int]:
     """Resolve the SAP 10.2 Table 12 (PDF p.189) heat-network fuel code
     from the §14.1 "Community Heat Source" + "Community Fuel Type"
@@ -5009,37 +5124,43 @@ _ELMHURST_CYLINDER_INSULATION_LABEL_TO_SAP10: Dict[str, int] = {
 # `cylinder_insulation_type = None` rather than naming a material. The lodged
 # §15.1 "Insulation Thickness" (0 mm) carries the storage-loss signal the
 # cascade's SAP 10.2 Table 2 dispatch needs.
-_ELMHURST_CYLINDER_NO_INSULATION_LABELS: frozenset[str] = frozenset({
-    "No Insulation",
-})
+_ELMHURST_CYLINDER_NO_INSULATION_LABELS: frozenset[str] = frozenset(
+    {
+        "No Insulation",
+    }
+)
 
 
 # Elmhurst §15.0 "Water Heating Fuel Type" labels that route to solid-
 # fuel Table 32 codes (Anthracite, House coal, Wood logs/pellets, etc.).
 # Used by `_resolve_elmhurst_inaccessible_cylinder_size` to detect the
 # "from solid fuel boiler" branch of RdSAP 10 Table 28 page 55.
-_ELMHURST_SOLID_FUEL_WATER_HEATING_LABELS: frozenset[str] = frozenset({
-    "Anthracite",
-    "House coal",
-    "Manufactured smokeless fuel",
-    "Wood logs",
-    "Wood pellets",
-    "Wood chips",
-    "Dual fuel (mineral and wood)",
-    "Coal",
-})
+_ELMHURST_SOLID_FUEL_WATER_HEATING_LABELS: frozenset[str] = frozenset(
+    {
+        "Anthracite",
+        "House coal",
+        "Manufactured smokeless fuel",
+        "Wood logs",
+        "Wood pellets",
+        "Wood chips",
+        "Dual fuel (mineral and wood)",
+        "Coal",
+    }
+)
 
 # Elmhurst §14.2 "Electricity meter type" labels that signify off-peak
 # / dual metering (where an inaccessible electric immersion is assumed
 # dual per RdSAP 10 §10.5.1 → Table 28 "off-peak electric dual
 # immersion" 210 L branch).
-_ELMHURST_DUAL_OFF_PEAK_METER_LABELS: frozenset[str] = frozenset({
-    "Dual",
-    "Dual (24 hour)",
-    "18 Hour",
-    "Off-peak 18 hour",
-    "10 Hour",
-})
+_ELMHURST_DUAL_OFF_PEAK_METER_LABELS: frozenset[str] = frozenset(
+    {
+        "Dual",
+        "Dual (24 hour)",
+        "18 Hour",
+        "Off-peak 18 hour",
+        "10 Hour",
+    }
+)
 
 
 def _resolve_elmhurst_inaccessible_cylinder_size(
@@ -5105,7 +5226,8 @@ def _elmhurst_cylinder_size_code(
                 ),
             )
         return _resolve_elmhurst_inaccessible_cylinder_size(
-            water_heating_fuel_label, meter_type_label,
+            water_heating_fuel_label,
+            meter_type_label,
         )
     code = _ELMHURST_CYLINDER_SIZE_LABEL_TO_SAP10.get(cylinder_size_label)
     if code is None:
@@ -5114,7 +5236,8 @@ def _elmhurst_cylinder_size_code(
 
 
 def _elmhurst_cylinder_insulation_code(
-    cylinder_insulation_label: Optional[str], cylinder_present: bool,
+    cylinder_insulation_label: Optional[str],
+    cylinder_present: bool,
 ) -> Optional[int]:
     """Map an Elmhurst §15.1 "Insulated" label to the SAP10
     `cylinder_insulation_type` cascade enum. Returns None when no
@@ -5503,7 +5626,8 @@ def _map_elmhurst_sap_heating(survey: ElmhurstSiteNotes) -> SapHeating:
     # boiler still strict-raises rather than being mis-billed.
     if main_fuel_int is None:
         main_fuel_int = _elmhurst_gas_boiler_main_fuel(
-            mh.main_heating_sap_code, water_heating_fuel,
+            mh.main_heating_sap_code,
+            water_heating_fuel,
             main_gas=survey.meters.main_gas,
         )
     # Solid-fuel main heating: SAP code rows 150-160 (open / closed
@@ -5527,10 +5651,7 @@ def _map_elmhurst_sap_heating(survey: ElmhurstSiteNotes) -> SapHeating:
     # Table 12 heat-network fuel code (PDF p.189, codes 41/43/48/51-58).
     # Cascade routes through `_is_heat_network_main` (which keys on the
     # SAP code) for the DLF and seasonal-efficiency overrides.
-    if (
-        main_fuel_int is None
-        and mh.community_heating is not None
-    ):
+    if main_fuel_int is None and mh.community_heating is not None:
         main_fuel_int = _resolve_community_heating_fuel_code(
             mh.community_heating.community_heat_source,
             mh.community_heating.community_fuel_type,
@@ -5570,11 +5691,13 @@ def _map_elmhurst_sap_heating(survey: ElmhurstSiteNotes) -> SapHeating:
     # multiplicity, and `None` left the cascade defaulting to mixer=1
     # on electric-only dwellings).
     electric_shower_count_from_survey = sum(
-        1 for s in survey.baths_and_showers.showers
+        1
+        for s in survey.baths_and_showers.showers
         if s.outlet_type == "Electric shower"
     )
     mixer_shower_count_from_survey = sum(
-        1 for s in survey.baths_and_showers.showers
+        1
+        for s in survey.baths_and_showers.showers
         if s.outlet_type != "Electric shower"
     )
     # Community heating CHP-split: RdSAP 10 §C / SAP 10.2 Appendix C
@@ -5593,11 +5716,17 @@ def _map_elmhurst_sap_heating(survey: ElmhurstSiteNotes) -> SapHeating:
         # PE-factor, and CO2-factor lookups; strings fall through
         # to defaults that drop the standing-charge component.
         main_fuel_type=main_fuel_int if main_fuel_int is not None else mh.fuel_type,
-        heat_emitter_type=heat_emitter_int if heat_emitter_int is not None else mh.heat_emitter,
-        emitter_temperature=_elmhurst_emitter_temperature_int(mh.design_flow_temperature),
+        heat_emitter_type=(
+            heat_emitter_int if heat_emitter_int is not None else mh.heat_emitter
+        ),
+        emitter_temperature=_elmhurst_emitter_temperature_int(
+            mh.design_flow_temperature
+        ),
         fan_flue_present=mh.fan_assisted_flue,
         boiler_flue_type=_elmhurst_flue_type_int(mh.flue_type),
-        main_heating_control=sap_control_int if sap_control_int is not None else control,
+        main_heating_control=(
+            sap_control_int if sap_control_int is not None else control
+        ),
         central_heating_pump_age=_elmhurst_pump_age_int(mh.heat_pump_age),
         central_heating_pump_age_str=mh.heat_pump_age,
         main_heating_category=main_heating_category,
@@ -5627,9 +5756,7 @@ def _map_elmhurst_sap_heating(survey: ElmhurstSiteNotes) -> SapHeating:
         main_age_band=survey.construction_age_band,
     )
     main_heating_details = (
-        [main_1_detail, main_2_detail]
-        if main_2_detail is not None
-        else [main_1_detail]
+        [main_1_detail, main_2_detail] if main_2_detail is not None else [main_1_detail]
     )
     # RdSAP 10 §10.11 Table 29 (p.56) — when the Summary lodges §15.1
     # "Cylinder Size: No Access" the cylinder is inaccessible during
@@ -5796,7 +5923,8 @@ def _map_elmhurst_ventilation(
         sheltered_sides=_elmhurst_sheltered_sides(built_form),
         has_suspended_timber_floor=has_suspended_timber_floor,
         suspended_timber_floor_sealed=(
-            None if has_suspended_timber_floor is None
+            None
+            if has_suspended_timber_floor is None
             else (False if has_suspended_timber_floor else None)
         ),
         air_permeability_ap4_m3_h_m2=v.air_permeability_ap4_m3_h_m2,
diff --git a/datatypes/epc/domain/tests/test_from_rdsap_schema.py b/datatypes/epc/domain/tests/test_from_rdsap_schema.py
index 04d9ff64..66e7fb10 100644
--- a/datatypes/epc/domain/tests/test_from_rdsap_schema.py
+++ b/datatypes/epc/domain/tests/test_from_rdsap_schema.py
@@ -307,6 +307,36 @@ class TestFromRdSapSchema21_0_0:
         # photovoltaic_supply is None when the measured shape is present
         assert result.sap_energy_source.photovoltaic_supply is None
 
+    def test_photovoltaic_array_orientation_nd_nulls_only_that_field(self) -> None:
+        # Arrange — a 3-array dwelling where the middle array lodges the RdSAP
+        # 'ND' ("Not Defined") sentinel for orientation. Regression for the
+        # real 21.0.1 cert 5236-4425-7600-0474-2292: 'ND' must null ONLY that
+        # array's orientation, not crash the int() coercion and drop every
+        # array (which happened when 'ND' was handled in the shared
+        # _measurement_value coercer instead of field-scoped _pv_orientation).
+        data = load("21_0_0.json")
+        data["sap_energy_source"]["photovoltaic_supply"] = [
+            [{"pitch": 3, "peak_power": 2.0, "orientation": 3, "overshading": 1}],
+            [{"pitch": 1, "peak_power": 2.0, "orientation": "ND", "overshading": 1}],
+            [{"pitch": 3, "peak_power": 2.0, "orientation": 7, "overshading": 1}],
+        ]
+        schema = from_dict(RdSapSchema21_0_0, data)
+
+        # Act
+        result = EpcPropertyDataMapper.from_rdsap_schema_21_0_0(schema)
+
+        # Assert — all three arrays survive; only the 'ND' orientation is None,
+        # and its sibling fields + the other arrays keep their real values.
+        arrays = result.sap_energy_source.photovoltaic_arrays
+        assert arrays is not None
+        assert len(arrays) == 3
+        assert [a.orientation for a in arrays] == [3, None, 7]
+        nd_array = arrays[1]
+        assert nd_array.orientation is None
+        assert nd_array.peak_power == 2.0
+        assert nd_array.pitch == 1
+        assert nd_array.overshading == 1
+
 
 # ---------------------------------------------------------------------------
 # Schema 21.0.1  (most comprehensive — full field coverage)
diff --git a/domain/sap10_calculator/rdsap/cert_to_inputs.py b/domain/sap10_calculator/rdsap/cert_to_inputs.py
index 37bb80f7..36f10c62 100644
--- a/domain/sap10_calculator/rdsap/cert_to_inputs.py
+++ b/domain/sap10_calculator/rdsap/cert_to_inputs.py
@@ -718,7 +718,7 @@ _HOURS_PER_DAY_OVER_1000: Final[float] = 0.024
 _DAYS_PER_MONTH: Final[tuple[int, ...]] = (31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)
 
 def _pv_annual_s_kwh_per_m2(
-    orientation_code: int,
+    orientation_code: Optional[int],
     pitch_code: int,
     climate: "int | PostcodeClimate",
 ) -> float:
@@ -727,8 +727,10 @@ def _pv_annual_s_kwh_per_m2(
     monthly Appendix U3.2 surface flux over the year. `climate` selects
     Table U3/U4 region (UK average = 0 for the rating cascade) or a
     `PostcodeClimate` from PCDB Table 172 for the demand cascade.
-    Returns 0.0 for unrecognised orientation codes (cert octants outside
-    1..8) — these PV arrays contribute nothing."""
+    Returns 0.0 for an unknown orientation (None when the cert lodged 'ND',
+    or a code outside 1..8) — these PV arrays contribute nothing."""
+    if orientation_code is None:
+        return 0.0
     orientation = ORIENTATION_BY_SAP10_CODE.get(orientation_code)
     if orientation is None:
         return 0.0
@@ -2475,8 +2477,10 @@ def _pv_array_monthly_generation_kwh(
         E_PV,m = 0.8 × kWp × ZPV × (days_m × S_m × 24 / 1000)
     where S_m is the §U3.2 surface flux (W/m²). Returns a 12-zero tuple
     for arrays whose orientation isn't mapped in
-    `ORIENTATION_BY_SAP10_CODE` (defensive — current cert lodgements
-    always cover 1..8)."""
+    `ORIENTATION_BY_SAP10_CODE` (defensive — None when the cert lodged
+    'ND', else a code outside 1..8)."""
+    if array.orientation is None:
+        return (0.0,) * 12
     orientation = ORIENTATION_BY_SAP10_CODE.get(array.orientation)
     if orientation is None:
         return (0.0,) * 12
diff --git a/domain/sap10_ml/transform.py b/domain/sap10_ml/transform.py
index cc8c39f6..964ea1be 100644
--- a/domain/sap10_ml/transform.py
+++ b/domain/sap10_ml/transform.py
@@ -1229,7 +1229,7 @@ def _pv_aggregates(es: SapEnergySource) -> dict[str, Any]:
             total_power += a.peak_power
             weighted_pitch += a.pitch * a.peak_power
             weighted_overshading += a.overshading * a.peak_power
-            if a.orientation in _OCTANT_NAMES:
+            if a.orientation is not None and a.orientation in _OCTANT_NAMES:
                 octant_power[_OCTANT_NAMES[a.orientation]] += a.peak_power
         aggregates["has_pv"] = True
         aggregates["pv_capacity_source"] = "measured"
diff --git a/infrastructure/epc_client/tests/test_mapper_corpus.py b/infrastructure/epc_client/tests/test_mapper_corpus.py
new file mode 100644
index 00000000..ecc36725
--- /dev/null
+++ b/infrastructure/epc_client/tests/test_mapper_corpus.py
@@ -0,0 +1,68 @@
+"""Drive EpcPropertyDataMapper against the harvested cert corpus.
+
+The corpus (backend/epc_api/json_samples/cert_corpus.jsonl) is a balanced
+sample of raw API certs across schema versions, produced by
+scripts/eon/harvest_certs.py. Each line is one cert in the exact shape
+``from_api_response`` consumes.
+
+  * 21.0.0 / 21.0.1 — supported today; these are a regression guard.
+  * 20.0.0           — mapper is incomplete, so these are xfail. As
+                       ``from_rdsap_schema_20_0_0`` is built out they flip to
+                       xpass; when the whole bucket passes, drop the xfail
+                       marker and the strict guard below will keep it honest.
+
+If the corpus hasn't been harvested yet, every parametrisation is skipped.
+"""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+from typing import Any
+
+import pytest
+
+from datatypes.epc.domain.epc_property_data import EpcPropertyData
+from datatypes.epc.domain.mapper import EpcPropertyDataMapper
+
+SAMPLES = Path("backend/epc_api/json_samples")
+SUPPORTED = {"RdSAP-Schema-21.0.1"}
+WIP = {"RdSAP-Schema-20.0.0"}
+
+
+def _load(schema: str) -> list[dict[str, Any]]:
+    """Load one schema's harvested corpus (json_samples/<schema>/corpus.jsonl)."""
+    path = SAMPLES / schema / "corpus.jsonl"
+    if not path.exists():
+        return []
+    return [
+        json.loads(line) for line in path.read_text().splitlines() if line.strip()
+    ]
+
+
+def _cases(schemas: set[str]) -> list[Any]:
+    certs = [(s, c) for s in schemas for c in _load(s)]
+    if not certs:
+        return [
+            pytest.param(
+                None,
+                marks=pytest.mark.skip(reason=f"no {schemas} corpus harvested"),
+                id="empty",
+            )
+        ]
+    return [
+        pytest.param(c, id=f"{s}-{i}") for i, (s, c) in enumerate(certs)
+    ]
+
+
+@pytest.mark.parametrize("cert", _cases(SUPPORTED))
+def test_supported_schemas_map(cert: dict[str, Any]) -> None:
+    result = EpcPropertyDataMapper.from_api_response(cert)
+    assert isinstance(result, EpcPropertyData)
+
+
+@pytest.mark.xfail(reason="RdSapSchema20.0.0 mapper is incomplete", strict=False)
+@pytest.mark.parametrize("cert", _cases(WIP))
+def test_wip_schema_20_maps(cert: dict[str, Any]) -> None:
+    result = EpcPropertyDataMapper.from_api_response(cert)
+    assert isinstance(result, EpcPropertyData)
diff --git a/pytest.ini b/pytest.ini
index 2bcd6178..503c9ec8 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -25,5 +25,6 @@ testpaths =
     etl/epc_clean/tests
     etl/hubspot/tests
     etl/spatial/tests
+    infrastructure/epc_client/tests/
 markers =
     integration: mark a test as an integration test