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Parse full-SAP SAP-Schema-17.1 certificate payloads 🟥

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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Jun-te Kim 2026-06-15 12:11:26 +00:00
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datatypes/epc/domain/tests/test_from_sap_schema.py Normal file
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"""Unit tests for the full-SAP (`SAP-Schema-17.1`) → `EpcPropertyData` mapper.
Mirrors `test_from_rdsap_schema.py`: parse a frozen real-cert fixture with
`from_dict`, then assert the mapper's per-field behaviour. Three fixtures
exercise the shape variation the design decisions hinge on
(`scripts/hyde/mapping_decisions.md`):
* `sap_17_1.json` — ground-floor flat, cert 0862-…-2325 (lodged 83)
* `sap_17_1_house.json` — semi-detached, 3-way wall split + roof window
* `sap_17_1_flat.json` — ground-floor flat, party wall + 2 distinct door U
"""
import json
import os
from typing import Any, Dict
import pytest
from datatypes.epc.schema.sap_schema_17_1 import SapSchema17_1
from datatypes.epc.schema.tests.helpers import from_dict
FIXTURES = os.path.join(os.path.dirname(__file__), "../../schema/tests/fixtures")
_ALL_FIXTURES = ("sap_17_1.json", "sap_17_1_house.json", "sap_17_1_flat.json")
def load(filename: str) -> Dict[str, Any]:
with open(os.path.join(FIXTURES, filename)) as f:
return json.load(f) # type: ignore[no-any-return]
class TestSapSchema17_1Parsing:
"""Slice 1: the schema dataclass parses the real full-SAP payloads."""
@pytest.mark.parametrize("fixture", _ALL_FIXTURES)
def test_parses_every_fixture(self, fixture: str) -> None:
# Arrange / Act
schema = from_dict(SapSchema17_1, load(fixture))
# Assert
assert schema.schema_type == "SAP-Schema-17.1"
def test_sample_identity_fields(self) -> None:
# Arrange / Act
schema = from_dict(SapSchema17_1, load("sap_17_1.json"))
# Assert
assert schema.uprn == 10092973954
assert schema.total_floor_area == 68

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datatypes/epc/schema/sap_schema_17_1.py Normal file
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"""Full-SAP (`SAP-Schema-17.1`) payload dataclasses.
Unlike the RdSAP schemas (reduced-data, for existing dwellings), full SAP
carries the measured SAP calculation input set — typically new-build /
on-construction (`assessment_type: "SAP"`). Built incrementally via TDD;
fields are modelled as the mapper slices demand them. `Optional[...]` per
observed corpus presence (`backend/epc_api/json_samples/SAP-Schema-17.1/
corpus.jsonl`), since the custom `from_dict` ignores unmodelled keys and
raises only on a missing *required* field.
"""
from dataclasses import dataclass
@dataclass
class SapSchema17_1:
# Stub — slice 1 will grow this to parse the real cert's identity fields.
uprn: int

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datatypes/epc/schema/tests/fixtures/sap_17_1.json vendored Normal file
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{
"uprn": 10092973954,
"roofs": [
{
"description": {
"value": "(other premises above)",
"language": "1"
},
"energy_efficiency_rating": 0,
"environmental_efficiency_rating": 0
}
],
"walls": [
{
"description": {
"value": "Average thermal transmittance 0.17 W/m\u00b2K",
"language": "1"
},
"energy_efficiency_rating": 5,
"environmental_efficiency_rating": 5
}
],
"floors": [
{
"description": {
"value": "Average thermal transmittance 0.13 W/m\u00b2K",
"language": "1"
},
"energy_efficiency_rating": 5,
"environmental_efficiency_rating": 5
}
],
"status": "entered",
"tenure": "ND",
"windows": {
"description": {
"value": "High performance glazing",
"language": "1"
},
"energy_efficiency_rating": 5,
"environmental_efficiency_rating": 5
},
"lighting": {
"description": {
"value": "Low energy lighting in all fixed outlets",
"language": "1"
},
"energy_efficiency_rating": 5,
"environmental_efficiency_rating": 5
},
"postcode": "ME1 3WR",
"data_type": 2,
"hot_water": {
"description": {
"value": "From main system",
"language": "1"
},
"energy_efficiency_rating": 4,
"environmental_efficiency_rating": 4
},
"post_town": "ROCHESTER",
"built_form": 1,
"created_at": "2020-03-12 08:41:35",
"living_area": 23.45,
"orientation": 6,
"region_code": 14,
"report_type": 3,
"sap_heating": {
"water_fuel_type": 1,
"water_heating_code": 901,
"main_heating_details": [
{
"main_fuel_type": 1,
"heat_emitter_type": 1,
"emitter_temperature": 0,
"is_flue_fan_present": "true",
"main_heating_number": 1,
"main_heating_control": 2110,
"is_interlocked_system": "true",
"main_heating_category": 2,
"main_heating_fraction": 1,
"main_heating_flue_type": 2,
"central_heating_pump_age": 2,
"main_heating_data_source": 1,
"main_heating_index_number": 17929,
"has_separate_delayed_start": "false",
"load_or_weather_compensation": 4,
"compensating_controller_index_number": 200004,
"is_central_heating_pump_in_heated_space": "true"
}
],
"has_hot_water_cylinder": "false",
"has_fixed_air_conditioning": "false",
"secondary_heating_category": 1,
"sap_heating_design_water_use": 1
},
"sap_version": 9.92,
"schema_type": "SAP-Schema-17.1",
"uprn_source": "Address Matched",
"country_code": "ENG",
"main_heating": [
{
"description": {
"value": "Boiler and radiators, mains gas",
"language": "1"
},
"energy_efficiency_rating": 4,
"environmental_efficiency_rating": 4
}
],
"air_tightness": {
"description": {
"value": "Air permeability 2.6 m\u00b3/h.m\u00b2 (as tested)",
"language": "1"
},
"energy_efficiency_rating": 5,
"environmental_efficiency_rating": 5
},
"dwelling_type": {
"value": "Ground-floor flat",
"language": "1"
},
"language_code": 1,
"property_type": 2,
"address_line_1": "Flat 1 William House",
"address_line_2": "22, Keepers Cottage Lane",
"address_line_3": "Wouldham",
"assessment_date": "2020-03-12",
"assessment_type": "SAP",
"completion_date": "2020-03-12",
"inspection_date": "2020-03-12",
"sap_ventilation": {
"psv_count": 0,
"pressure_test": 1,
"wet_rooms_count": 2,
"air_permeability": 2.6,
"open_flues_count": 0,
"ventilation_type": 6,
"extract_fans_count": 0,
"open_fireplaces_count": 0,
"sheltered_sides_count": 1,
"kitchen_duct_fans_count": 0,
"kitchen_room_fans_count": 0,
"kitchen_wall_fans_count": 1,
"flueless_gas_fires_count": 0,
"mechanical_vent_duct_type": 2,
"non_kitchen_duct_fans_count": 0,
"non_kitchen_room_fans_count": 0,
"non_kitchen_wall_fans_count": 1,
"mechanical_ventilation_data_source": 1,
"mechanical_vent_system_index_number": 500229,
"is_mechanical_vent_approved_installer_scheme": "true"
},
"design_water_use": 1,
"sap_data_version": 9.92,
"sap_flat_details": {
"level": 1
},
"total_floor_area": 68,
"transaction_type": 6,
"conservatory_type": 1,
"registration_date": "2020-03-12",
"sap_energy_source": {
"electricity_tariff": 1,
"wind_turbines_count": 0,
"wind_turbine_terrain_type": 2,
"fixed_lighting_outlets_count": 1,
"low_energy_fixed_lighting_outlets_count": 1,
"low_energy_fixed_lighting_outlets_percentage": 100
},
"sap_opening_types": [
{
"name": "Door (1)",
"type": 1,
"u_value": 1.4,
"data_source": 2,
"description": "Data from Manufacturer",
"glazing_type": 1
},
{
"name": "Windows (1)",
"type": 4,
"u_value": 1.4,
"frame_type": 2,
"data_source": 2,
"description": "Data from Manufacturer",
"frame_factor": 0.7,
"glazing_type": 7,
"solar_transmittance": 0.63
}
],
"secondary_heating": {
"description": {
"value": "None",
"language": "1"
},
"energy_efficiency_rating": 0,
"environmental_efficiency_rating": 0
},
"sap_building_parts": [
{
"sap_roofs": [
{
"name": "Exposed Roof",
"u_value": 0,
"roof_type": 2,
"kappa_value": 0,
"total_roof_area": 0
},
{
"name": "Ceiling",
"u_value": 0,
"roof_type": 4,
"kappa_value": 20,
"total_roof_area": 67.84
}
],
"sap_walls": [
{
"name": "Brickwork",
"u_value": 0.18,
"wall_type": 2,
"kappa_value": 18,
"total_wall_area": 13.1,
"is_curtain_walling": "false"
},
{
"name": "Weatherboarding",
"u_value": 0.18,
"wall_type": 2,
"kappa_value": 18,
"total_wall_area": 46.95,
"is_curtain_walling": "false"
},
{
"name": "Sole Plate Detail",
"u_value": 0.18,
"wall_type": 2,
"kappa_value": 18,
"total_wall_area": 3.1,
"is_curtain_walling": "false"
},
{
"name": "Stair Wall",
"u_value": 0.19,
"wall_type": 2,
"kappa_value": 18,
"total_wall_area": 28.39,
"is_curtain_walling": "false"
},
{
"name": "Stud Walls",
"u_value": 0,
"wall_type": 5,
"kappa_value": 9,
"total_wall_area": 125.952
}
],
"identifier": "Main Dwelling",
"overshading": 2,
"sap_openings": [
{
"name": 1,
"type": "Door (1)",
"width": 1,
"height": 2,
"location": "Stair Wall",
"orientation": 6
},
{
"name": 2,
"type": "Windows (1)",
"width": 1,
"height": 5.92,
"location": "Brickwork",
"orientation": 8
},
{
"name": 3,
"type": "Windows (1)",
"width": 1,
"height": 1.45,
"location": "Brickwork",
"orientation": 2
},
{
"name": 4,
"type": "Windows (1)",
"width": 1,
"height": 1.45,
"location": "Brickwork",
"orientation": 6
},
{
"name": 5,
"type": "Windows (1)",
"width": 1,
"height": 5.28,
"location": "Weatherboarding",
"orientation": 2
},
{
"name": 6,
"type": "Windows (1)",
"width": 1,
"height": 1.5,
"location": "Weatherboarding",
"orientation": 4
}
],
"construction_year": 2020,
"sap_thermal_bridges": {
"thermal_bridges": [
{
"length": 9.79,
"psi_value": 0.3,
"psi_value_source": 2,
"thermal_bridge_type": "E2"
},
{
"length": 3.18,
"psi_value": 0.04,
"psi_value_source": 2,
"thermal_bridge_type": "E3"
},
{
"length": 23.7,
"psi_value": 0.05,
"psi_value_source": 2,
"thermal_bridge_type": "E4"
},
{
"length": 38.14,
"psi_value": 0.16,
"psi_value_source": 2,
"thermal_bridge_type": "E5"
},
{
"length": 38.14,
"psi_value": 0.07,
"psi_value_source": 2,
"thermal_bridge_type": "E7"
},
{
"length": 21.6,
"psi_value": 0.09,
"psi_value_source": 2,
"thermal_bridge_type": "E16"
},
{
"length": 12,
"psi_value": -0.09,
"psi_value_source": 2,
"thermal_bridge_type": "E17"
}
],
"thermal_bridge_code": 5
},
"building_part_number": 1,
"sap_floor_dimensions": [
{
"storey": 0,
"u_value": 0.13,
"floor_type": 2,
"kappa_value": 75,
"storey_height": 2.4,
"heat_loss_area": 67.84,
"total_floor_area": 67.84
}
]
}
],
"heating_cost_current": {
"value": 201,
"currency": "GBP"
},
"co2_emissions_current": 1.1,
"energy_rating_average": 60,
"energy_rating_current": 83,
"lighting_cost_current": {
"value": 55,
"currency": "GBP"
},
"main_heating_controls": [
{
"description": {
"value": "Time and temperature zone control",
"language": "1"
},
"energy_efficiency_rating": 5,
"environmental_efficiency_rating": 5
}
],
"has_hot_water_cylinder": "false",
"heating_cost_potential": {
"value": 201,
"currency": "GBP"
},
"hot_water_cost_current": {
"value": 68,
"currency": "GBP"
},
"co2_emissions_potential": 1.1,
"energy_rating_potential": 83,
"lighting_cost_potential": {
"value": 55,
"currency": "GBP"
},
"schema_version_original": "LIG-17.0",
"hot_water_cost_potential": {
"value": 68,
"currency": "GBP"
},
"is_in_smoke_control_area": "unknown",
"renewable_heat_incentive": {
"rhi_new_dwelling": {
"space_heating": 2140,
"water_heating": 1522
}
},
"seller_commission_report": "Y",
"energy_consumption_current": 91,
"has_fixed_air_conditioning": "false",
"multiple_glazed_percentage": 100,
"calculation_software_version": "Version: 1.0.4.25",
"energy_consumption_potential": 91,
"environmental_impact_current": 86,
"current_energy_efficiency_band": "B",
"environmental_impact_potential": 86,
"has_heated_separate_conservatory": "false",
"potential_energy_efficiency_band": "B",
"co2_emissions_current_per_floor_area": 16
}

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datatypes/epc/schema/tests/fixtures/sap_17_1_flat.json vendored Normal file
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{
"uprn": 90124027,
"roofs": [
{
"description": "Average thermal transmittance 0.32 W/m\u00b2K",
"energy_efficiency_rating": 3,
"environmental_efficiency_rating": 3
}
],
"walls": [
{
"description": "Average thermal transmittance 0.30 W/m\u00b2K",
"energy_efficiency_rating": 4,
"environmental_efficiency_rating": 4
}
],
"floors": [
{
"description": "Average thermal transmittance 0.57 W/m\u00b2K",
"energy_efficiency_rating": 2,
"environmental_efficiency_rating": 2
}
],
"status": "entered",
"tenure": "ND",
"windows": {
"description": "Fully double glazed",
"energy_efficiency_rating": 3,
"environmental_efficiency_rating": 3
},
"lighting": {
"description": "Low energy lighting in 67% of fixed outlets",
"energy_efficiency_rating": 4,
"environmental_efficiency_rating": 4
},
"postcode": "DY1 2QG",
"data_type": 4,
"hot_water": {
"description": "From main system",
"energy_efficiency_rating": 4,
"environmental_efficiency_rating": 4
},
"post_town": "DUDLEY",
"built_form": 3,
"created_at": "2019-04-16 16:00:34",
"living_area": 14.87,
"orientation": 5,
"region_code": 6,
"report_type": 3,
"sap_heating": {
"thermal_store": 1,
"water_fuel_type": 1,
"water_heating_code": 901,
"main_heating_details": [
{
"main_fuel_type": 1,
"heat_emitter_type": 1,
"emitter_temperature": 0,
"is_flue_fan_present": "true",
"main_heating_number": 1,
"main_heating_control": 2104,
"is_interlocked_system": "false",
"main_heating_category": 2,
"main_heating_fraction": 1,
"main_heating_flue_type": 2,
"central_heating_pump_age": 2,
"main_heating_data_source": 1,
"main_heating_index_number": 17507,
"has_separate_delayed_start": "false",
"load_or_weather_compensation": 0,
"is_central_heating_pump_in_heated_space": "true"
}
],
"has_hot_water_cylinder": "false",
"has_fixed_air_conditioning": "false",
"secondary_heating_category": 1
},
"sap_version": 9.92,
"schema_type": "SAP-Schema-17.1",
"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,
"property_type": 2,
"address_line_1": "Flat 1 Banklands",
"address_line_2": "94, Himley Road",
"assessment_date": "2019-04-16",
"assessment_type": "SAP",
"completion_date": "2019-04-16",
"inspection_date": "2019-04-16",
"sap_ventilation": {
"psv_count": 0,
"pressure_test": 3,
"air_permeability": 15,
"open_flues_count": 0,
"ventilation_type": 1,
"extract_fans_count": 2,
"open_fireplaces_count": 0,
"sheltered_sides_count": 2,
"flueless_gas_fires_count": 0
},
"sap_data_version": 9.92,
"sap_flat_details": {
"level": 1
},
"total_floor_area": 41,
"transaction_type": 6,
"conservatory_type": 1,
"registration_date": "2019-04-16",
"sap_energy_source": {
"electricity_tariff": 1,
"wind_turbines_count": 0,
"wind_turbine_terrain_type": 2,
"fixed_lighting_outlets_count": 6,
"low_energy_fixed_lighting_outlets_count": 4,
"low_energy_fixed_lighting_outlets_percentage": 67
},
"sap_opening_types": [
{
"name": "DTC",
"type": 3,
"u_value": 1.4,
"data_source": 3,
"glazing_type": 1
},
{
"name": "new Window",
"type": 4,
"u_value": 1.6,
"data_source": 2,
"frame_factor": 0.7,
"glazing_type": 3,
"solar_transmittance": 0.76
},
{
"name": "New HGD",
"type": 2,
"u_value": 1.8,
"data_source": 2,
"glazing_type": 3
},
{
"name": "Existing Glazing",
"type": 4,
"u_value": 2.8,
"frame_type": 2,
"data_source": 3,
"glazing_gap": 2,
"frame_factor": 0.7,
"glazing_type": 3,
"isargonfilled": "false",
"solar_transmittance": 0.76
}
],
"secondary_heating": {
"description": "None",
"energy_efficiency_rating": 0,
"environmental_efficiency_rating": 0
},
"sap_building_parts": [
{
"sap_roofs": [
{
"name": "Roof 1",
"u_value": 0.32,
"roof_type": 2,
"description": "External Roof 1",
"total_roof_area": 6.94
},
{
"name": "Party roof 1",
"u_value": 0,
"roof_type": 4,
"description": "Party Ceilings 1",
"total_roof_area": 33.66
}
],
"sap_walls": [
{
"name": "External Wall 1",
"u_value": 0.31,
"wall_type": 2,
"description": "External Wall 1",
"total_wall_area": 31.56,
"is_curtain_walling": "false"
},
{
"name": "External Wall 2",
"u_value": 0.31,
"wall_type": 3,
"description": "WTC",
"total_wall_area": 15.48,
"is_curtain_walling": "false"
},
{
"name": "Party Wall 0",
"u_value": 0,
"wall_type": 4,
"total_wall_area": 30.72
}
],
"identifier": "Main Dwelling",
"overshading": 2,
"sap_openings": [
{
"name": "Front",
"type": "DTC",
"width": 1.89,
"height": 1,
"location": "External Wall 2",
"orientation": 0
},
{
"name": "Rear",
"type": "Existing Glazing",
"width": 4.51,
"height": 1,
"location": "External Wall 1",
"orientation": 1
},
{
"name": "Rear",
"type": "New HGD",
"width": 2.12,
"height": 1,
"location": "External Wall 1",
"orientation": 0
},
{
"name": "Side",
"type": "new Window",
"width": 0.97,
"height": 1,
"location": "External Wall 1",
"orientation": 3
}
],
"construction_year": 2019,
"sap_thermal_bridges": {
"thermal_bridge_code": 1
},
"building_part_number": 1,
"sap_floor_dimensions": [
{
"storey": 0,
"u_value": 0.57,
"floor_type": 2,
"description": "Heat Loss Floor 1",
"storey_height": 2.4,
"heat_loss_area": 40.6,
"total_floor_area": 40.6
}
],
"thermal_mass_parameter": 100
}
],
"heating_cost_current": {
"value": 279,
"currency": "GBP"
},
"co2_emissions_current": 1.5,
"energy_rating_average": 60,
"energy_rating_current": 73,
"lighting_cost_current": {
"value": 47,
"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": 281,
"currency": "GBP"
},
"hot_water_cost_current": {
"value": 69,
"currency": "GBP"
},
"suggested_improvements": [
{
"sequence": 1,
"typical_saving": {
"value": 11,
"currency": "GBP"
},
"indicative_cost": "\u00a310",
"improvement_type": "E",
"improvement_details": {
"improvement_number": 35
},
"improvement_category": 5,
"energy_performance_rating": 74,
"environmental_impact_rating": 76
}
],
"co2_emissions_potential": 1.5,
"energy_rating_potential": 74,
"lighting_cost_potential": {
"value": 36,
"currency": "GBP"
},
"schema_version_original": "LIG-17.0",
"hot_water_cost_potential": {
"value": 69,
"currency": "GBP"
},
"is_in_smoke_control_area": "unknown",
"renewable_heat_incentive": {
"rhi_new_dwelling": {
"space_heating": 3899,
"water_heating": 1553
}
},
"seller_commission_report": "Y",
"energy_consumption_current": 216,
"has_fixed_air_conditioning": "false",
"multiple_glazed_percentage": 100,
"calculation_software_version": "4.10r08",
"energy_consumption_potential": 212,
"environmental_impact_current": 76,
"current_energy_efficiency_band": "C",
"environmental_impact_potential": 76,
"has_heated_separate_conservatory": "false",
"potential_energy_efficiency_band": "C",
"co2_emissions_current_per_floor_area": 38
}

448
datatypes/epc/schema/tests/fixtures/sap_17_1_house.json vendored Normal file
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{
"uprn": 10090592989,
"roofs": [
{
"description": "Average thermal transmittance 0.14 W/m\u00b2K",
"energy_efficiency_rating": 5,
"environmental_efficiency_rating": 5
}
],
"walls": [
{
"description": "Average thermal transmittance 0.27 W/m\u00b2K",
"energy_efficiency_rating": 5,
"environmental_efficiency_rating": 5
}
],
"floors": [
{
"description": "Average thermal transmittance 0.22 W/m\u00b2K",
"energy_efficiency_rating": 4,
"environmental_efficiency_rating": 4
}
],
"status": "entered",
"tenure": "ND",
"windows": {
"description": "High performance glazing",
"energy_efficiency_rating": 5,
"environmental_efficiency_rating": 5
},
"lighting": {
"description": "Low energy lighting in all fixed outlets",
"energy_efficiency_rating": 5,
"environmental_efficiency_rating": 5
},
"postcode": "DN11 8FB",
"data_type": 2,
"hot_water": {
"description": "From main system",
"energy_efficiency_rating": 4,
"environmental_efficiency_rating": 4
},
"post_town": "DONCASTER",
"built_form": 2,
"created_at": "2019-07-29 10:22:30",
"living_area": 14.54,
"orientation": 4,
"region_code": 3,
"report_type": 3,
"sap_heating": {
"thermal_store": 1,
"water_fuel_type": 1,
"water_heating_code": 901,
"main_heating_details": [
{
"main_fuel_type": 1,
"heat_emitter_type": 1,
"emitter_temperature": 1,
"is_flue_fan_present": "true",
"main_heating_number": 1,
"main_heating_control": 2110,
"is_interlocked_system": "true",
"main_heating_category": 2,
"main_heating_fraction": 1,
"main_heating_flue_type": 2,
"central_heating_pump_age": 2,
"main_heating_data_source": 1,
"main_heating_index_number": 17045,
"has_separate_delayed_start": "true",
"load_or_weather_compensation": 0,
"is_central_heating_pump_in_heated_space": "true"
}
],
"has_hot_water_cylinder": "false",
"has_fixed_air_conditioning": "false",
"secondary_heating_category": 1
},
"sap_version": 9.92,
"schema_type": "SAP-Schema-17.1",
"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": "Air permeability 7.5 m\u00b3/h.m\u00b2 (assessed average)",
"energy_efficiency_rating": 3,
"environmental_efficiency_rating": 3
},
"dwelling_type": "Semi-detached house",
"language_code": 1,
"property_type": 0,
"address_line_1": "29, Avalon Gardens",
"address_line_2": "Harworth",
"assessment_date": "2019-07-29",
"assessment_type": "SAP",
"completion_date": "2019-07-29",
"inspection_date": "2019-07-29",
"sap_ventilation": {
"psv_count": 0,
"pressure_test": 5,
"air_permeability": 5.47,
"open_flues_count": 0,
"ventilation_type": 1,
"extract_fans_count": 4,
"open_fireplaces_count": 0,
"sheltered_sides_count": 2,
"flueless_gas_fires_count": 0
},
"design_water_use": 1,
"sap_data_version": 9.9,
"total_floor_area": 82,
"transaction_type": 6,
"conservatory_type": 1,
"registration_date": "2019-07-29",
"sap_energy_source": {
"electricity_tariff": 1,
"wind_turbines_count": 0,
"wind_turbine_terrain_type": 1,
"fixed_lighting_outlets_count": 11,
"low_energy_fixed_lighting_outlets_count": 11,
"low_energy_fixed_lighting_outlets_percentage": 100
},
"sap_opening_types": [
{
"name": "Door",
"type": 1,
"u_value": 1.1,
"data_source": 2,
"glazing_type": 1
},
{
"name": "Windows",
"type": 4,
"u_value": 1.35,
"data_source": 2,
"frame_factor": 0.7,
"glazing_type": 7,
"solar_transmittance": 0.63
},
{
"name": "Rooflights",
"type": 5,
"u_value": 1.35,
"data_source": 2,
"frame_factor": 0.7,
"glazing_type": 7,
"solar_transmittance": 0.63
}
],
"secondary_heating": {
"description": "None",
"energy_efficiency_rating": 0,
"environmental_efficiency_rating": 0
},
"sap_building_parts": [
{
"sap_roofs": [
{
"name": "Roof 1",
"u_value": 0.14,
"roof_type": 2,
"description": "Cold Roof",
"kappa_value": 0,
"total_roof_area": 45.87
}
],
"sap_walls": [
{
"name": "External Wall 1",
"u_value": 0.26,
"wall_type": 2,
"description": "External Wall",
"kappa_value": 0,
"total_wall_area": 91.31,
"is_curtain_walling": "false"
},
{
"name": "External Wall 2",
"u_value": 0.4,
"wall_type": 3,
"description": "Garage Wall",
"kappa_value": 0,
"total_wall_area": 17.02,
"is_curtain_walling": "false"
},
{
"name": "Party Wall 0",
"u_value": 0,
"wall_type": 4,
"kappa_value": 45,
"total_wall_area": 29.56
},
{
"name": "Internal Wall 0",
"u_value": 0,
"wall_type": 5,
"kappa_value": 9,
"total_wall_area": 55.0346
},
{
"name": "Internal Wall 0",
"u_value": 0,
"wall_type": 5,
"kappa_value": 9,
"total_wall_area": 97.359
}
],
"identifier": "Main Dwelling",
"overshading": 2,
"sap_openings": [
{
"name": "Front Door",
"type": "Door",
"width": 1.95,
"height": 1,
"location": "External Wall 1",
"orientation": 0
},
{
"name": "Front Windows",
"type": "Windows",
"width": 5.33,
"height": 1,
"location": "External Wall 1",
"orientation": 4
},
{
"name": "RH Windows",
"type": "Windows",
"width": 0.66,
"height": 1,
"location": "External Wall 1",
"orientation": 2
},
{
"name": "Rear Windows",
"type": "Windows",
"width": 7.92,
"height": 1,
"location": "External Wall 1",
"orientation": 8
}
],
"construction_year": 2015,
"sap_thermal_bridges": {
"thermal_bridges": [
{
"length": 11.19,
"psi_value": 0.395,
"psi_value_source": 3,
"thermal_bridge_type": "E1"
},
{
"length": 8.46,
"psi_value": 0.028,
"psi_value_source": 3,
"thermal_bridge_type": "E3"
},
{
"length": 27,
"psi_value": 0.035,
"psi_value_source": 3,
"thermal_bridge_type": "E4"
},
{
"length": 25.51,
"psi_value": 0.061,
"psi_value_source": 3,
"thermal_bridge_type": "E5"
},
{
"length": 22.28,
"psi_value": 0.07,
"psi_value_source": 2,
"thermal_bridge_type": "E6"
},
{
"length": 12.86,
"psi_value": 0.098,
"psi_value_source": 3,
"thermal_bridge_type": "E10"
},
{
"length": 10.76,
"psi_value": 0.069,
"psi_value_source": 3,
"thermal_bridge_type": "E12"
},
{
"length": 14.4,
"psi_value": 0.062,
"psi_value_source": 3,
"thermal_bridge_type": "E16"
},
{
"length": 4.65,
"psi_value": -0.078,
"psi_value_source": 3,
"thermal_bridge_type": "E17"
},
{
"length": 9.75,
"psi_value": 0.076,
"psi_value_source": 3,
"thermal_bridge_type": "E18"
},
{
"length": 4.46,
"psi_value": 0.043,
"psi_value_source": 3,
"thermal_bridge_type": "P1"
},
{
"length": 4.46,
"psi_value": 0,
"psi_value_source": 4,
"thermal_bridge_type": "P2"
},
{
"length": 7.52,
"psi_value": 0.055,
"psi_value_source": 3,
"thermal_bridge_type": "P4"
}
],
"thermal_bridge_code": 5
},
"building_part_number": 1,
"sap_floor_dimensions": [
{
"storey": 0,
"u_value": 0.22,
"floor_type": 2,
"description": "Ground Floor",
"kappa_value": 0,
"storey_height": 2.33,
"heat_loss_area": 37.78,
"total_floor_area": 37.78,
"kappa_value_from_below": 9
},
{
"storey": 1,
"u_value": 0.21,
"floor_type": 3,
"description": "Floor Above Garage",
"kappa_value": 18,
"storey_height": 2.55,
"heat_loss_area": 8.08,
"total_floor_area": 43.99
}
]
}
],
"heating_cost_current": {
"value": 241,
"currency": "GBP"
},
"co2_emissions_current": 1.4,
"energy_rating_average": 60,
"energy_rating_current": 83,
"lighting_cost_current": {
"value": 64,
"currency": "GBP"
},
"main_heating_controls": [
{
"description": "Time and temperature zone control",
"energy_efficiency_rating": 5,
"environmental_efficiency_rating": 5
}
],
"has_hot_water_cylinder": "false",
"heating_cost_potential": {
"value": 241,
"currency": "GBP"
},
"hot_water_cost_current": {
"value": 79,
"currency": "GBP"
},
"suggested_improvements": [
{
"sequence": 1,
"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": 84,
"environmental_impact_rating": 87
},
{
"sequence": 2,
"typical_saving": {
"value": 294,
"currency": "GBP"
},
"indicative_cost": "\u00a33,500 - \u00a35,500",
"improvement_type": "U",
"improvement_details": {
"improvement_number": 34
},
"improvement_category": 5,
"energy_performance_rating": 94,
"environmental_impact_rating": 96
}
],
"co2_emissions_potential": 0.4,
"energy_rating_potential": 94,
"lighting_cost_potential": {
"value": 64,
"currency": "GBP"
},
"schema_version_original": "LIG-17.0",
"hot_water_cost_potential": {
"value": 50,
"currency": "GBP"
},
"is_in_smoke_control_area": "unknown",
"renewable_heat_incentive": {
"rhi_new_dwelling": {
"space_heating": 3202,
"water_heating": 1776
}
},
"seller_commission_report": "Y",
"energy_consumption_current": 100,
"has_fixed_air_conditioning": "false",
"multiple_glazed_percentage": 100,
"calculation_software_version": "4.04r04",
"energy_consumption_potential": 24,
"environmental_impact_current": 85,
"current_energy_efficiency_band": "B",
"environmental_impact_potential": 96,
"has_heated_separate_conservatory": "false",
"potential_energy_efficiency_band": "A",
"co2_emissions_current_per_floor_area": 17
}