test(accuracy): ratchet SAP MAE 0.658 -> 0.647 via wall added-insulation unknown-thickness default

A SOLID-BRICK or STONE wall lodging External/Internal insulation (wall_insulation_type 1/3) but no measured insulation thickness (gov-API "NI" -> None) was billed at its UNINSULATED §5.6/Table-6 U-value: the §5.8 added-insulation R-value adjustment gates on `insulation_thickness_mm > 0`, so an unknown thickness fell straight through to the raw solid-wall U (~1.4-1.7). This over-counted wall heat loss and under-rated the dwelling. RdSAP 10 §5.4 (PDF p.32): "the U-value with additional insulation is based on the thickness of insulation of mineral wool type (assume 100 mm if thickness is unknown)". Apply that 100 mm default so the §5.8 Table-14 R-value fires. Scoped to solid brick / stone (the only constructions with a §5.8 R-value path in u_wall) so cavity (composite path) and timber / system-built walls are untouched. Localised by deep-diving corpus cert 200004296092 (end-terrace, solid brick 360 mm "with external insulation", NI): walls 101.7 W/K (U~1.40, HLP 3.46 = absurd for an insulated wall) -> ~0.29; PE +59.6 -> ~0; engine 64.35 (Δ -6.65) -> 71.74 = lodged 71. ~8 solid-brick/stone corpus certs carry this NI-thickness-with-insulation shape. Gauge: within-0.5 held at 77.0%, SAP MAE 0.658 -> 0.647, CO2 0.074 -> 0.073, PE 3.2 -> 3.1 (floor ratcheted). Unit-pinned in test_rdsap_uvalues (brick 360 mm external NI -> 0.29) + RealCertExpectation 200004296092 = 72. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-12 13:29:04 +00:00 · 2026-07-02 20:24:56 +00:00 · 2026-07-02 20:24:56 +00:00 · 0e784cbb1c
commit 0e784cbb1c
parent cb089a630c
6 changed files with 639 additions and 198 deletions
--- a/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_200004296092/epc.json
+++ b/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_200004296092/epc.json
@ -0,0 +1,361 @@
+{
+  "uprn": 200004296092,
+  "roofs": [
+    {
+      "description": "Pitched, 150 mm loft insulation",
+      "energy_efficiency_rating": 4,
+      "environmental_efficiency_rating": 4
+    }
+  ],
+  "walls": [
+    {
+      "description": "Solid brick, with external insulation",
+      "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
+  },
+  "lighting": {
+    "description": "Excellent lighting efficiency",
+    "energy_efficiency_rating": 5,
+    "environmental_efficiency_rating": 5
+  },
+  "postcode": "LL16 3RL",
+  "hot_water": {
+    "description": "From main system",
+    "energy_efficiency_rating": 4,
+    "environmental_efficiency_rating": 4
+  },
+  "post_town": "DENBIGH",
+  "psv_count": 0,
+  "built_form": 3,
+  "created_at": "2026-05-14 14:33:05",
+  "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": 2
+      }
+    ],
+    "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": 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": 16137
+      }
+    ],
+    "immersion_heating_type": "NA",
+    "has_fixed_air_conditioning": "false"
+  },
+  "sap_version": 10.2,
+  "sap_windows": [
+    {
+      "pvc_frame": "true",
+      "orientation": 5,
+      "window_type": 1,
+      "glazing_type": 2,
+      "window_width": {
+        "value": 1.07,
+        "quantity": "m"
+      },
+      "window_height": {
+        "value": 1.34,
+        "quantity": "m"
+      },
+      "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": {
+        "value": 1.07,
+        "quantity": "m"
+      },
+      "window_height": {
+        "value": 1.34,
+        "quantity": "m"
+      },
+      "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": {
+        "value": 0.47,
+        "quantity": "m"
+      },
+      "window_height": {
+        "value": 0.85,
+        "quantity": "m"
+      },
+      "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": {
+        "value": 0.47,
+        "quantity": "m"
+      },
+      "window_height": {
+        "value": 0.85,
+        "quantity": "m"
+      },
+      "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": {
+        "value": 0.76,
+        "quantity": "m"
+      },
+      "window_height": {
+        "value": 0.84,
+        "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": "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": "End-terrace house",
+  "language_code": 1,
+  "pressure_test": 4,
+  "property_type": 0,
+  "address_line_1": "54 Myddleton Avenue",
+  "assessment_type": "RdSAP",
+  "completion_date": "2026-05-14",
+  "inspection_date": "2026-05-14",
+  "extensions_count": 0,
+  "measurement_type": 1,
+  "open_flues_count": 0,
+  "total_floor_area": 62,
+  "transaction_type": 1,
+  "conservatory_type": 1,
+  "heated_room_count": 3,
+  "other_flues_count": 0,
+  "registration_date": "2026-05-14",
+  "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
+  },
+  "closed_flues_count": 0,
+  "extract_fans_count": 0,
+  "sap_building_parts": [
+    {
+      "identifier": "Main Dwelling",
+      "wall_dry_lined": "N",
+      "wall_thickness": 360,
+      "floor_heat_loss": 7,
+      "roof_construction": 4,
+      "wall_construction": 3,
+      "building_part_number": 1,
+      "sap_floor_dimensions": [
+        {
+          "floor": 0,
+          "room_height": 2.4,
+          "floor_insulation": 1,
+          "total_floor_area": 31.16,
+          "party_wall_length": 6.79,
+          "floor_construction": 1,
+          "heat_loss_perimeter": 15.97
+        },
+        {
+          "floor": 1,
+          "room_height": 2.4,
+          "total_floor_area": 31.16,
+          "party_wall_length": 6.79,
+          "heat_loss_perimeter": 15.97
+        }
+      ],
+      "wall_insulation_type": 1,
+      "construction_age_band": "B",
+      "party_wall_construction": 0,
+      "wall_thickness_measured": "Y",
+      "roof_insulation_location": 2,
+      "roof_insulation_thickness": "150mm",
+      "wall_insulation_thickness": "NI"
+    }
+  ],
+  "boilers_flues_count": 0,
+  "open_chimneys_count": 0,
+  "solar_water_heating": "N",
+  "habitable_room_count": 3,
+  "heating_cost_current": {
+    "value": 589,
+    "currency": "GBP"
+  },
+  "insulated_door_count": 0,
+  "co2_emissions_current": 1.8,
+  "energy_rating_average": 60,
+  "energy_rating_current": 71,
+  "lighting_cost_current": {
+    "value": 50,
+    "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": 543,
+    "currency": "GBP"
+  },
+  "hot_water_cost_current": {
+    "value": 275,
+    "currency": "GBP"
+  },
+  "mechanical_ventilation": 0,
+  "percent_draughtproofed": 100,
+  "schema_version_current": "LIG-21.0",
+  "suggested_improvements": [
+    {
+      "sequence": 1,
+      "typical_saving": 47,
+      "indicative_cost": "\u00a35,000 - \u00a310,000",
+      "improvement_type": "W2",
+      "improvement_details": {
+        "improvement_number": 58
+      },
+      "improvement_category": 5,
+      "energy_performance_rating": 72,
+      "environmental_impact_rating": 79
+    },
+    {
+      "sequence": 2,
+      "typical_saving": 275,
+      "indicative_cost": "\u00a38,000 - \u00a310,000",
+      "improvement_type": "U",
+      "improvement_details": {
+        "improvement_number": 34
+      },
+      "improvement_category": 5,
+      "energy_performance_rating": 84,
+      "environmental_impact_rating": 81
+    }
+  ],
+  "co2_emissions_potential": 1.4,
+  "energy_rating_potential": 84,
+  "lighting_cost_potential": {
+    "value": 50,
+    "currency": "GBP"
+  },
+  "schema_version_original": "LIG-21.0",
+  "hot_water_cost_potential": {
+    "value": 275,
+    "currency": "GBP"
+  },
+  "renewable_heat_incentive": {
+    "water_heating": 1768.31,
+    "space_heating_existing_dwelling": 5933.75
+  },
+  "draughtproofed_door_count": 2,
+  "energy_consumption_current": 169,
+  "has_fixed_air_conditioning": "false",
+  "multiple_glazed_proportion": 100,
+  "calculation_software_version": "10.2.2.0",
+  "energy_consumption_potential": 130,
+  "environmental_impact_current": 77,
+  "cfl_fixed_lighting_bulbs_count": 0,
+  "current_energy_efficiency_band": "C",
+  "environmental_impact_potential": 81,
+  "led_fixed_lighting_bulbs_count": 12,
+  "has_heated_separate_conservatory": "false",
+  "potential_energy_efficiency_band": "B",
+  "co2_emissions_current_per_floor_area": 29,
+  "incandescent_fixed_lighting_bulbs_count": 0
+}
--- a/domain/sap10_ml/rdsap_uvalues.py
+++ b/domain/sap10_ml/rdsap_uvalues.py
@ -157,6 +157,11 @@ _WALL_INSULATION_INTERNAL: Final[int] = 3
 WALL_INSULATION_CAVITY_PLUS_EXTERNAL: Final[int] = 6
 WALL_INSULATION_CAVITY_PLUS_INTERNAL: Final[int] = 7

+# RdSAP 10 §5.4 (PDF p.32): "assume 100 mm if thickness is unknown" — the
+# default added-insulation thickness for an External / Internal wall
+# insulation lodgement (type 1/3) with no measured thickness.
+_WALL_ADDED_INSULATION_UNKNOWN_THICKNESS_MM: Final[int] = 100
+
 # RdSAP 10 §4-6 (page 73): default thermal conductivity of insulation when
 # no documentary evidence is available. Used to convert the lodged
 # `wall_insulation_thickness` (mm) into thermal resistance (m²K/W) via
@ -589,6 +594,28 @@ def u_wall(
    ctry = country if country is not None else Country.ENG
    age_idx = _age_index(age_band)
    band = _AGE_BANDS[age_idx]
+    # RdSAP 10 §5.4 (PDF p.32): "the U-value with additional insulation is
+    # based on the thickness of insulation of mineral wool type (assume
+    # 100 mm if thickness is unknown)". A SOLID-BRICK or STONE wall lodging
+    # External or Internal insulation (wall_insulation_type 1/3) but no
+    # measured insulation thickness (gov-API "NI" → None) takes the 100 mm
+    # default so the §5.8 Table-14 R-value adjustment (brick/stone branches
+    # below) fires instead of billing the wall at its uninsulated
+    # §5.6/Table-6 U (over-counting fabric loss → under-rate; corpus cert
+    # 200004296092, solid brick 360 mm, walls 101.7 W/K → PE +59.6). Scoped
+    # to brick/stone because only those constructions have a §5.8 added-
+    # insulation R-value path here — cavity uses the separate
+    # `WALL_INSULATION_CAVITY_PLUS_*` composite, and timber/system-built
+    # carry no §5.8 branch, so a thickness default there would be inert or
+    # mis-routed.
+    if (
+        construction
+        in (WALL_STONE_GRANITE, WALL_STONE_SANDSTONE, WALL_SOLID_BRICK)
+        and wall_insulation_type
+        in (_WALL_INSULATION_EXTERNAL, _WALL_INSULATION_INTERNAL)
+        and (insulation_thickness_mm is None or insulation_thickness_mm == 0)
+    ):
+        insulation_thickness_mm = _WALL_ADDED_INSULATION_UNKNOWN_THICKNESS_MM
    # RdSAP 10 Tables 6-10 stone rows + footnote (a) (PDF p.33-39), §5.6
    # formula (PDF p.40), §5.8 + Table 14 (PDF p.41-42). A documentary wall
    # thickness (per §5.3) routes stone in age bands A-E off the §5.6 formula,
--- a/domain/sap10_ml/tests/test_rdsap_uvalues.py
+++ b/domain/sap10_ml/tests/test_rdsap_uvalues.py
@ -835,6 +835,34 @@ def test_u_wall_stone_granite_with_external_insulation_applies_5_8_table_14_r_va
    assert abs(result - 0.57) <= 1e-4


+def test_u_wall_solid_brick_external_insulation_unknown_thickness_assumes_100mm() -> None:
+    # Arrange — RdSAP 10 §5.4 (PDF p.32): "the U-value with additional
+    # insulation is based on the thickness of insulation of mineral wool
+    # type (assume 100 mm if thickness is unknown)". A solid brick / stone
+    # wall lodging External or Internal insulation (wall_insulation_type
+    # 1/3) but NO measured insulation thickness (gov-API "NI" → parsed to
+    # None) must take the 100 mm §5.4 default so the §5.8 Table-14 R-value
+    # fires — NOT fall through to the uninsulated §5.6 U. Corpus cert
+    # 200004296092 (age-B solid brick 360 mm, "with external insulation",
+    # thickness NI) was billed at the uninsulated 1.40 (walls 101.7 W/K,
+    # HLP 3.46) → PE +59.6, SAP −6.65. With 100 mm: U₀(§5.6, 360 mm brick)
+    # + R(100 mm, λ=0.04 → 2.5) → 0.29.
+
+    # Act
+    result = u_wall(
+        country=Country.ENG,
+        age_band="B",
+        construction=WALL_SOLID_BRICK,
+        insulation_thickness_mm=None,  # gov-API "NI" — thickness unknown
+        insulation_present=True,
+        wall_insulation_type=1,  # External
+        wall_thickness_mm=360,
+    )
+
+    # Assert — 100 mm default applied, not the uninsulated 1.40.
+    assert abs(result - 0.29) <= 1e-4
+
+
 def test_u_wall_stone_granite_age_g_with_wall_thickness_ignores_5_6_formula_per_age_a_to_e_gate() -> None:
    # Arrange — §5.6 (PDF p.40) heading explicitly scopes the formula
    # to "age bands A to E". For age F onwards Table 6 gives literal
--- a/scripts/corpus_1000/worklist.md
+++ b/scripts/corpus_1000/worklist.md
@ -1,6 +1,6 @@
 # RdSAP-21.0.1 corpus campaign ledger

-**Gauge:** 1000 computed / 0 skipped · SAP within-0.5 = **77.0%** · MAE = **0.658** (floors in test_sap_accuracy_corpus.py)
+**Gauge:** 1000 computed / 0 skipped · SAP within-0.5 = **77.0%** · MAE = **0.647** (floors in test_sap_accuracy_corpus.py)

 Statuses: `[ ]` todo · `[x]` resolved ≤0.5 · 🔧 fix landed · ⚠ xfail engine bug · ⛔ unbuildable. Line: `uprn · lodged L / eng E / Δ · signature`. Rebuild/re-rank: `PYTHONPATH=. python scripts/corpus_1000/build_worklist.py` (preserves statuses & `<-` notes).

@ -42,584 +42,584 @@ Statuses: `[ ]` todo · `[x]` resolved ≤0.5 · 🔧 fix landed · ⚠ xfail en
 ### C011 · Σ|Δ| 6.7 · 1 certs · `h691/elec | solid brick | pitched 100 | RR,ext1,whw909`
 - [ ] `100032223878` · L 11 / E 17.67 / Δ +6.67

-### C012 · Σ|Δ| 6.6 · 1 certs · `hpcdb16137/gas | solid brick | pitched 150`
- [ ] `200004296092` · L 71 / E 64.35 / Δ -6.65
-
-### C013 · Σ|Δ| 6.5 · 1 certs · `h408/elec | granite or | (another dwelling | sec:portable electric,whw903`
+### C012 · Σ|Δ| 6.5 · 1 certs · `h408/elec | granite or | (another dwelling | sec:portable electric,whw903`
 - [ ] `100121397382` · L 69 / E 75.49 / Δ +6.49

-### C014 · Σ|Δ| 6.5 · 1 certs · `h691/elec | solid brick | (another dwelling | ext1,sec:room heaters,whw903`
+### C013 · Σ|Δ| 6.5 · 1 certs · `h691/elec | solid brick | (another dwelling | ext1,sec:room heaters,whw903`
 - [ ] `100062100640` · L 54 / E 47.51 / Δ -6.49

-### C015 · Σ|Δ| 6.0 · 1 certs · `h301/coal-anth | cavity wall | pitched 225`
+### C014 · Σ|Δ| 6.0 · 1 certs · `h301/coal-anth | cavity wall | pitched 225`
 - [ ] `100050844968` · L 71 / E 65.02 / Δ -5.98

-### C016 · Σ|Δ| 5.8 · 1 certs · `hpcdb17777/gas+2mains | cavity wall | pitched insulated | ext1,sec:room heaters,whw914`
+### C015 · Σ|Δ| 5.8 · 1 certs · `hpcdb17777/gas+2mains | cavity wall | pitched insulated | ext1,sec:room heaters,whw914`
 - [ ] `line804` · L 52 / E 57.76 / Δ +5.76

-### C017 · Σ|Δ| 5.7 · 1 certs · `hpcdb17507/gas | solid brick | pitched 150 | ext1,mv2`
- [ ] `200049463` · L 69 / E 63.28 / Δ -5.72
-
-### C018 · Σ|Δ| 5.6 · 2 certs · `h402/elec | solid brick | (another dwelling | sec:portable electric,whw903`
+### C016 · Σ|Δ| 5.6 · 2 certs · `h402/elec | solid brick | (another dwelling | sec:portable electric,whw903`
 - [ ] `11071248` · L 78 / E 81.86 / Δ +3.86
 - [ ] `12126160` · L 69 / E 70.71 / Δ +1.71

-### C019 · Σ|Δ| 4.6 · 1 certs · `hpcdb18560/gas | solid brick | pitched no | RR`
+### C017 · Σ|Δ| 4.6 · 1 certs · `hpcdb18560/gas | solid brick | pitched no | RR`
 - [ ] `100051233481` · L 65 / E 69.64 / Δ +4.64

-### C020 · Σ|Δ| 4.5 · 1 certs · `h691/elec | timber frame | pitched limited | RR,ext2,whw903`
+### C018 · Σ|Δ| 4.5 · 1 certs · `h691/elec | timber frame | pitched limited | RR,ext2,whw903`
 - [ ] `100061646773` · L 68 / E 63.46 / Δ -4.54

-### C021 · Σ|Δ| 4.5 · 1 certs · `hpcdb18786/fuel27 | solid brick | pitched 100 | RR,consv3`
+### C019 · Σ|Δ| 4.5 · 1 certs · `hpcdb18786/fuel27 | solid brick | pitched 100 | RR,consv3`
 - [ ] `100071010014` · L 55 / E 50.47 / Δ -4.53

-### C022 · Σ|Δ| 4.5 · 1 certs · `hpcdb17815/gas | cavity wall | flat insulated`
+### C020 · Σ|Δ| 4.5 · 1 certs · `hpcdb17815/gas | cavity wall | flat insulated`
 - [ ] `47084930` · L 74 / E 69.51 / Δ -4.49

-### C023 · Σ|Δ| 4.5 · 1 certs · `h301/coal-anth | system built | (another dwelling | mv4`
+### C021 · Σ|Δ| 4.5 · 1 certs · `h301/coal-anth | system built | (another dwelling | mv4`
 - [ ] `10093342182` · L 82 / E 77.51 / Δ -4.49

-### C024 · Σ|Δ| 4.4 · 1 certs · `hpcdb17973/gas | solid brick | (another dwelling`
+### C022 · Σ|Δ| 4.4 · 1 certs · `hpcdb17973/gas | solid brick | (another dwelling`
 - [ ] `5117280` · L 76 / E 71.56 / Δ -4.44

-### C025 · Σ|Δ| 4.4 · 1 certs · `h191/elec | solid brick | (another dwelling | ext2`
+### C023 · Σ|Δ| 4.4 · 1 certs · `h191/elec | solid brick | (another dwelling | ext2`
 - [ ] `217060420` · L 42 / E 37.58 / Δ -4.42

-### C026 · Σ|Δ| 4.4 · 1 certs · `h402/elec | cavity wall | (another dwelling | sec:room heaters,whw903`
+### C024 · Σ|Δ| 4.4 · 1 certs · `h402/elec | cavity wall | (another dwelling | sec:room heaters,whw903`
 - [ ] `72399971` · L 69 / E 64.60 / Δ -4.40

-### C027 · Σ|Δ| 4.4 · 1 certs · `hpcdb19258/fuel28 | granite or | pitched no | ext2,sec:room heaters`
+### C025 · Σ|Δ| 4.4 · 1 certs · `hpcdb19258/fuel28 | granite or | pitched no | ext2,sec:room heaters`
 - [ ] `10007016314` · L 57 / E 52.64 / Δ -4.36

-### C028 · Σ|Δ| 4.1 · 1 certs · `h633/heatnet | sandstone with | pitched insulated | sec:room heaters,whw903`
+### C026 · Σ|Δ| 4.1 · 1 certs · `h633/heatnet | sandstone with | pitched insulated | sec:room heaters,whw903`
 - [ ] `100052159386` · L 56 / E 51.92 / Δ -4.08

-### C029 · Σ|Δ| 4.0 · 1 certs · `h191/elec | cavity wall | (another dwelling`
+### C027 · Σ|Δ| 4.0 · 1 certs · `h191/elec | cavity wall | (another dwelling`
 - [ ] `10002272664` · L 79 / E 74.96 / Δ -4.04

-### C030 · Σ|Δ| 4.0 · 1 certs · `h408/elec | cavity wall | pitched 100 | ext1,sec:room heaters,whw903`
+### C028 · Σ|Δ| 4.0 · 1 certs · `h408/elec | cavity wall | pitched 100 | ext1,sec:room heaters,whw903`
 - [ ] `100040767294` · L 43 / E 47.04 / Δ +4.04

-### C031 · Σ|Δ| 3.6 · 1 certs · `hpcdb15445/gas | granite or | pitched no | RR,ext3,sec:room heaters`
+### C029 · Σ|Δ| 3.6 · 1 certs · `hpcdb15445/gas | granite or | pitched no | RR,ext3,sec:room heaters`
 - [ ] `10002188054` · L 68 / E 64.42 / Δ -3.58

-### C032 · Σ|Δ| 3.5 · 1 certs · `hpcdb18234/gas | cavity wall | pitched insulated | PV,ext2,sec:room heaters`
+### C030 · Σ|Δ| 3.5 · 1 certs · `hpcdb18234/gas | cavity wall | pitched insulated | PV,ext2,sec:room heaters`
 - [ ] `39066537` · L 78 / E 81.49 / Δ +3.49

-### C033 · Σ|Δ| 3.5 · 1 certs · `hpcdb8387/gas | cavity wall | pitched 150`
+### C031 · Σ|Δ| 3.5 · 1 certs · `hpcdb8387/gas | cavity wall | pitched 150`
 - [ ] `100100137438` · L 69 / E 72.48 / Δ +3.48

-### C034 · Σ|Δ| 3.4 · 1 certs · `hpcdb17507/gas | cavity wall | pitched insulated | RR,sec:room heaters`
+### C032 · Σ|Δ| 3.4 · 1 certs · `hpcdb17507/gas | cavity wall | pitched insulated | RR,sec:room heaters`
 - [ ] `100080122910` · L 60 / E 63.45 / Δ +3.45

-### C035 · Σ|Δ| 3.3 · 1 certs · `h691/elec | cavity wall | pitched 300 | mv5,sec:portable electric,whw903`
+### C033 · Σ|Δ| 3.3 · 1 certs · `h691/elec | cavity wall | pitched 300 | mv5,sec:portable electric,whw903`
 - [ ] `452010022` · L 42 / E 38.67 / Δ -3.33

-### C036 · Σ|Δ| 3.3 · 1 certs · `h402/elec | cavity wall | pitched 150 | ext1,sec:room heaters,whw903`
+### C034 · Σ|Δ| 3.3 · 1 certs · `h402/elec | cavity wall | pitched 150 | ext1,sec:room heaters,whw903`
 - [ ] `200004818752` · L 34 / E 30.73 / Δ -3.27

-### C037 · Σ|Δ| 3.2 · 1 certs · `hpcdb18759/gas | sandstone as | pitched insulated | RR,ext1,sec:room heaters`
+### C035 · Σ|Δ| 3.2 · 1 certs · `hpcdb18759/gas | sandstone as | pitched insulated | RR,ext1,sec:room heaters`
 - [ ] `72351021` · L 64 / E 60.85 / Δ -3.15

-### C038 · Σ|Δ| 3.1 · 1 certs · `h633/heatnet | timber frame | roof room(s) | RR,ext1,sec:room heaters,whw909`
+### C036 · Σ|Δ| 3.1 · 1 certs · `h633/heatnet | timber frame | roof room(s) | RR,ext1,sec:room heaters,whw909`
 - [ ] `22077224` · L 37 / E 33.90 / Δ -3.10

-### C039 · Σ|Δ| 3.0 · 1 certs · `hpcdb18498/gas | solid brick | pitched 250 | RR,ext2`
+### C037 · Σ|Δ| 3.0 · 1 certs · `hpcdb18498/gas | solid brick | pitched 250 | RR,ext2`
 - [ ] `10011740578` · L 70 / E 67.00 / Δ -3.00

-### C040 · Σ|Δ| 2.9 · 1 certs · `h402/elec | cavity wall | pitched 250 | sec:portable electric,whw903`
+### C038 · Σ|Δ| 2.9 · 1 certs · `h402/elec | cavity wall | pitched 250 | sec:portable electric,whw903`
 - [ ] `100110680822` · L 79 / E 76.07 / Δ -2.93

-### C041 · Σ|Δ| 2.9 · 1 certs · `h301/coal-anth | solid brick | pitched 250`
+### C039 · Σ|Δ| 2.9 · 1 certs · `h301/coal-anth | solid brick | pitched 250`
 - [ ] `452032915` · L 75 / E 72.09 / Δ -2.91

-### C042 · Σ|Δ| 2.9 · 1 certs · `h301/coal-anth | cavity wall | (another dwelling | whw909`
+### C040 · Σ|Δ| 2.9 · 1 certs · `h301/coal-anth | cavity wall | (another dwelling | whw909`
 - [ ] `100071306639` · L 73 / E 70.14 / Δ -2.86

-### C043 · Σ|Δ| 2.9 · 1 certs · `hpcdb18435/gas+2mains | cavity wall | pitched 100 | ext3,sec:room heaters,whw903`
+### C041 · Σ|Δ| 2.9 · 1 certs · `hpcdb18435/gas+2mains | cavity wall | pitched 100 | ext3,sec:room heaters,whw903`
 - [ ] `100061346049` · L 55 / E 52.15 / Δ -2.85

-### C044 · Σ|Δ| 2.7 · 1 certs · `hpcdb8443/fuel28 | cavity wall | pitched 100 | RR,ext2,sec:room heaters`
+### C042 · Σ|Δ| 2.7 · 1 certs · `hpcdb8443/fuel28 | cavity wall | pitched 100 | RR,ext2,sec:room heaters`
 - [ ] `10013008238` · L 41 / E 38.26 / Δ -2.74

-### C045 · Σ|Δ| 2.7 · 3 certs · `h691/elec | cavity wall | (another dwelling | whw903`
+### C043 · Σ|Δ| 2.7 · 3 certs · `h691/elec | cavity wall | (another dwelling | whw903`
 - [ ] `10033187652` · L 70 / E 71.21 / Δ +1.21
 - [ ] `200002730` · L 65 / E 64.13 / Δ -0.87
 - [ ] `10023328117` · L 78 / E 78.64 / Δ +0.64

-### C046 · Σ|Δ| 2.7 · 1 certs · `h633/heatnet | cavity wall | pitched 200 | RR,sec:room heaters,whw903`
+### C044 · Σ|Δ| 2.7 · 1 certs · `h633/heatnet | cavity wall | pitched 200 | RR,sec:room heaters,whw903`
 - [ ] `10004873253` · L 65 / E 62.29 / Δ -2.71

-### C047 · Σ|Δ| 2.7 · 1 certs · `h691/elec | cavity wall | (another dwelling | mv1,whw903`
+### C045 · Σ|Δ| 2.7 · 1 certs · `h691/elec | cavity wall | (another dwelling | mv1,whw903`
 - [ ] `10090793715` · L 73 / E 75.71 / Δ +2.71

-### C048 · Σ|Δ| 2.7 · 1 certs · `hpcdb17964/gas+2mains | cavity wall | pitched 100 | ext1,sec:room heaters`
+### C046 · Σ|Δ| 2.7 · 1 certs · `hpcdb17964/gas+2mains | cavity wall | pitched 100 | ext1,sec:room heaters`
 - [ ] `100120745600` · L 65 / E 67.69 / Δ +2.69

-### C049 · Σ|Δ| 2.7 · 1 certs · `hpcdb17757/gas | granite or | pitched no | RR,ext1`
+### C047 · Σ|Δ| 2.7 · 1 certs · `hpcdb17757/gas | granite or | pitched no | RR,ext1`
 - [ ] `100051178830` · L 63 / E 65.66 / Δ +2.66

-### C050 · Σ|Δ| 2.6 · 1 certs · `hpcdb10321/gas | sandstone as | pitched 100 | ext2`
+### C048 · Σ|Δ| 2.6 · 1 certs · `hpcdb10321/gas | sandstone as | pitched 100 | ext2`
 - [ ] `100120018282` · L 64 / E 61.36 / Δ -2.64

-### C051 · Σ|Δ| 2.6 · 1 certs · `hpcdb17968/gas | cavity wall | pitched 300 | ext2,sec:room heaters`
+### C049 · Σ|Δ| 2.6 · 1 certs · `hpcdb17968/gas | cavity wall | pitched 300 | ext2,sec:room heaters`
 - [ ] `83035979` · L 65 / E 67.60 / Δ +2.60

-### C052 · Σ|Δ| 2.5 · 1 certs · `h524/elec | solid brick | (another dwelling | consv2,sec:room heaters,whw909`
+### C050 · Σ|Δ| 2.5 · 1 certs · `h524/elec | solid brick | (another dwelling | consv2,sec:room heaters,whw909`
 - [ ] `10014073761` · L 75 / E 72.52 / Δ -2.48

-### C053 · Σ|Δ| 2.5 · 1 certs · `hpcdb10328/gas | solid brick | pitched insulated | RR`
+### C051 · Σ|Δ| 2.5 · 1 certs · `hpcdb10328/gas | solid brick | pitched insulated | RR`
 - [ ] `100050964834` · L 60 / E 62.47 / Δ +2.47

-### C054 · Σ|Δ| 2.4 · 1 certs · `h694/elec | cavity wall | (another dwelling | whw941`
+### C052 · Σ|Δ| 2.4 · 1 certs · `h694/elec | cavity wall | (another dwelling | whw941`
 - [ ] `100120752995` · L 71 / E 73.42 / Δ +2.42

-### C055 · Σ|Δ| 2.4 · 1 certs · `hpcdb1245/gas | solid brick | pitched insulated | ext1`
+### C053 · Σ|Δ| 2.4 · 1 certs · `hpcdb1245/gas | solid brick | pitched insulated | ext1`
 - [ ] `100032230128` · L 55 / E 52.60 / Δ -2.40

-### C056 · Σ|Δ| 2.3 · 1 certs · `hpcdb15753/gas | solid brick | pitched 150 | RR`
+### C054 · Σ|Δ| 2.3 · 1 certs · `hpcdb15753/gas | solid brick | pitched 150 | RR`
 - [ ] `100000034023` · L 73 / E 70.71 / Δ -2.29

-### C057 · Σ|Δ| 2.2 · 1 certs · `h506/gas | cavity wall | flat limited | sec:room heaters`
+### C055 · Σ|Δ| 2.2 · 1 certs · `h506/gas | cavity wall | flat limited | sec:room heaters`
 - [ ] `100020377671` · L 62 / E 64.23 / Δ +2.23

-### C058 · Σ|Δ| 2.2 · 1 certs · `h104/gas | solid brick | pitched insulated | RR,ext1`
+### C056 · Σ|Δ| 2.2 · 1 certs · `h104/gas | solid brick | pitched insulated | RR,ext1`
 - [ ] `22027335` · L 76 / E 73.77 / Δ -2.23

-### C059 · Σ|Δ| 2.2 · 1 certs · `h408/elec+2mains | sandstone as | (another dwelling | sec:room heaters,whw903`
+### C057 · Σ|Δ| 2.2 · 1 certs · `h408/elec+2mains | sandstone as | (another dwelling | sec:room heaters,whw903`
 - [ ] `80838` · L 41 / E 43.19 / Δ +2.19

-### C060 · Σ|Δ| 2.1 · 1 certs · `hpcdb18833/gas | solid brick | pitched insulated | RR,ext1,sec:room heaters`
+### C058 · Σ|Δ| 2.1 · 1 certs · `hpcdb18833/gas | solid brick | pitched insulated | RR,ext1,sec:room heaters`
 - [ ] `48056153` · L 65 / E 62.89 / Δ -2.11

-### C061 · Σ|Δ| 2.0 · 1 certs · `hpcdb19008/gas | solid brick | pitched insulated | sec:room heaters`
+### C059 · Σ|Δ| 2.0 · 1 certs · `hpcdb19008/gas | solid brick | pitched insulated | sec:room heaters`
 - [ ] `100021924710` · L 63 / E 65.00 / Δ +2.00

-### C062 · Σ|Δ| 1.9 · 1 certs · `hpcdb18774/gas | solid brick | pitched 100 | RR,ext1`
+### C060 · Σ|Δ| 1.9 · 1 certs · `hpcdb18774/gas | solid brick | pitched 100 | RR,ext1`
 - [ ] `100031270375` · L 69 / E 70.93 / Δ +1.93

-### C063 · Σ|Δ| 1.9 · 1 certs · `hpcdb106417/elec | cavity wall | pitched 250 | RR,ext2,sec:room heaters`
+### C061 · Σ|Δ| 1.9 · 1 certs · `hpcdb106417/elec | cavity wall | pitched 250 | RR,ext2,sec:room heaters`
 - [ ] `10001118522` · L 80 / E 78.07 / Δ -1.93

-### C064 · Σ|Δ| 1.9 · 1 certs · `h192/elec | cavity wall | (another dwelling`
+### C062 · Σ|Δ| 1.9 · 1 certs · `h192/elec | cavity wall | (another dwelling`
 - [ ] `10010234711` · L 81 / E 79.08 / Δ -1.92

-### C065 · Σ|Δ| 1.9 · 1 certs · `hpcdb18250/gas | solid brick | pitched 100 | consv2,sec:room heaters`
+### C063 · Σ|Δ| 1.9 · 1 certs · `hpcdb18250/gas | solid brick | pitched 100 | consv2,sec:room heaters`
 - [ ] `100031768368` · L 61 / E 59.12 / Δ -1.88

-### C066 · Σ|Δ| 1.8 · 1 certs · `h301/elec10hr | cavity wall | (another dwelling`
+### C064 · Σ|Δ| 1.8 · 1 certs · `h301/elec10hr | cavity wall | (another dwelling`
 - [ ] `4510729926` · L 73 / E 71.15 / Δ -1.85

-### C067 · Σ|Δ| 1.8 · 1 certs · `hpcdb17138/fuel28 | granite or | pitched 200 | ext1,sec:room heaters`
+### C065 · Σ|Δ| 1.8 · 1 certs · `hpcdb17138/fuel28 | granite or | pitched 200 | ext1,sec:room heaters`
 - [ ] `100091329112` · L 49 / E 50.82 / Δ +1.82

-### C068 · Σ|Δ| 1.8 · 2 certs · `hpcdb18908/gas | solid brick | pitched 300`
+### C066 · Σ|Δ| 1.8 · 2 certs · `hpcdb18908/gas | solid brick | pitched 300`
 - [ ] `100061275133` · L 76 / E 77.24 / Δ +1.24
 - [ ] `207032630` · L 74 / E 73.47 / Δ -0.53

-### C069 · Σ|Δ| 1.8 · 1 certs · `h691/elec | timber frame | pitched insulated | RR,ext1,sec:portable electric,whw908`
+### C067 · Σ|Δ| 1.8 · 1 certs · `h691/elec | timber frame | pitched insulated | RR,ext1,sec:portable electric,whw908`
 - [ ] `10011797347` · L 47 / E 48.77 / Δ +1.77

-### C070 · Σ|Δ| 1.8 · 1 certs · `hpcdb17570/gas+2mains | solid brick | (another dwelling | RR,ext3,sec:room heaters`
+### C068 · Σ|Δ| 1.8 · 1 certs · `hpcdb17570/gas+2mains | solid brick | (another dwelling | RR,ext3,sec:room heaters`
 - [ ] `100022668387` · L 68 / E 66.25 / Δ -1.75

-### C071 · Σ|Δ| 1.8 · 1 certs · `hpcdb17803/gas | timber frame | pitched 100`
+### C069 · Σ|Δ| 1.8 · 1 certs · `hpcdb17803/gas | timber frame | pitched 100`
 - [ ] `200004017091` · L 71 / E 72.75 / Δ +1.75

-### C072 · Σ|Δ| 1.7 · 1 certs · `hpcdb10354/gas+2mains | sandstone as | pitched 300 | ext1`
+### C070 · Σ|Δ| 1.7 · 1 certs · `hpcdb10354/gas+2mains | sandstone as | pitched 300 | ext1`
 - [ ] `100100892216` · L 69 / E 67.28 / Δ -1.72

-### C073 · Σ|Δ| 1.7 · 1 certs · `hpcdb8119/gas | cavity wall | pitched insulated | RR,ext1`
+### C071 · Σ|Δ| 1.7 · 1 certs · `hpcdb8119/gas | cavity wall | pitched insulated | RR,ext1`
 - [ ] `100060878876` · L 49 / E 50.71 / Δ +1.71

-### C074 · Σ|Δ| 1.7 · 1 certs · `h401/elec | solid brick | (another dwelling | sec:portable electric,whw950`
+### C072 · Σ|Δ| 1.7 · 1 certs · `h401/elec | solid brick | (another dwelling | sec:portable electric,whw950`
 - [ ] `22032926` · L 61 / E 62.71 / Δ +1.71

-### C075 · Σ|Δ| 1.7 · 1 certs · `hpcdb18560/gas | cavity wall | pitched insulated | RR,ext1`
+### C073 · Σ|Δ| 1.7 · 1 certs · `hpcdb18560/gas | cavity wall | pitched insulated | RR,ext1`
 - [ ] `100010942905` · L 72 / E 73.70 / Δ +1.70

-### C076 · Σ|Δ| 1.6 · 1 certs · `hpcdb18119/gas | solid brick | pitched 100 | ext1`
+### C074 · Σ|Δ| 1.6 · 1 certs · `hpcdb18119/gas | solid brick | pitched 100 | ext1`
 - [ ] `100030307976` · L 71 / E 69.37 / Δ -1.63

-### C077 · Σ|Δ| 1.6 · 1 certs · `hpcdb18909/gas | cavity wall | pitched 100 | whw903`
+### C075 · Σ|Δ| 1.6 · 1 certs · `hpcdb18909/gas | cavity wall | pitched 100 | whw903`
 - [ ] `100061404488` · L 70 / E 68.38 / Δ -1.62

-### C078 · Σ|Δ| 1.6 · 1 certs · `h402/elec | system built | (another dwelling | sec:room heaters,whw903`
+### C076 · Σ|Δ| 1.6 · 1 certs · `h402/elec | system built | (another dwelling | sec:room heaters,whw903`
 - [ ] `21067296` · L 67 / E 68.60 / Δ +1.60

-### C079 · Σ|Δ| 1.6 · 1 certs · `hpcdb10164/gas | solid brick | pitched insulated | sec:room heaters`
+### C077 · Σ|Δ| 1.6 · 1 certs · `hpcdb10164/gas | solid brick | pitched insulated | sec:room heaters`
 - [ ] `5870047440` · L 58 / E 59.58 / Δ +1.58

-### C080 · Σ|Δ| 1.6 · 1 certs · `hpcdb8051/gas | cavity wall | (same dwelling | ext2`
+### C078 · Σ|Δ| 1.6 · 1 certs · `hpcdb8051/gas | cavity wall | (same dwelling | ext2`
 - [ ] `100070450818` · L 65 / E 63.43 / Δ -1.57

-### C081 · Σ|Δ| 1.6 · 1 certs · `hpcdb17741/gas | cavity wall | pitched 225`
+### C079 · Σ|Δ| 1.6 · 1 certs · `hpcdb17741/gas | cavity wall | pitched 225`
 - [ ] `100050881708` · L 70 / E 71.55 / Δ +1.55

-### C082 · Σ|Δ| 1.5 · 1 certs · `h301/elec | system built | (another dwelling | whw950`
+### C080 · Σ|Δ| 1.5 · 1 certs · `h301/elec | system built | (another dwelling | whw950`
 - [ ] `10010254955` · L 79 / E 77.46 / Δ -1.54

-### C083 · Σ|Δ| 1.5 · 1 certs · `hpcdb16839/gas | cavity wall | pitched 400+ | ext1,mv2,sec:room heaters`
+### C081 · Σ|Δ| 1.5 · 1 certs · `hpcdb16839/gas | cavity wall | pitched 400+ | ext1,mv2,sec:room heaters`
 - [ ] `3455011834` · L 69 / E 67.48 / Δ -1.52

-### C084 · Σ|Δ| 1.5 · 1 certs · `hpcdb15502/gas | granite or | pitched 150 | RR,ext1,sec:room heaters`
+### C082 · Σ|Δ| 1.5 · 1 certs · `hpcdb15502/gas | granite or | pitched 150 | RR,ext1,sec:room heaters`
 - [ ] `100100274789` · L 60 / E 61.51 / Δ +1.51

-### C085 · Σ|Δ| 1.5 · 1 certs · `hpcdb16453/gas | cavity wall | pitched 300 | consv2,ext1`
+### C083 · Σ|Δ| 1.5 · 1 certs · `hpcdb16453/gas | cavity wall | pitched 300 | consv2,ext1`
 - [ ] `100050852755` · L 65 / E 66.49 / Δ +1.49

-### C086 · Σ|Δ| 1.5 · 1 certs · `hpcdb17679/gas | solid brick | pitched 125 | ext1`
+### C084 · Σ|Δ| 1.5 · 1 certs · `hpcdb17679/gas | solid brick | pitched 125 | ext1`
 - [ ] `100021326422` · L 70 / E 68.51 / Δ -1.49

-### C087 · Σ|Δ| 1.5 · 1 certs · `hpcdb15029/gas | solid brick | pitched insulated | RR,ext1`
+### C085 · Σ|Δ| 1.5 · 1 certs · `hpcdb15029/gas | solid brick | pitched insulated | RR,ext1`
 - [ ] `100050988345` · L 61 / E 59.51 / Δ -1.49

-### C088 · Σ|Δ| 1.5 · 1 certs · `hpcdb17998/gas | solid brick | pitched insulated | RR,consv2`
+### C086 · Σ|Δ| 1.5 · 1 certs · `hpcdb17998/gas | solid brick | pitched insulated | RR,consv2`
 - [ ] `100030285758` · L 54 / E 55.48 / Δ +1.48

-### C089 · Σ|Δ| 1.5 · 1 certs · `hpcdb17974/gas | cavity wall | pitched 175 | PV,ext1`
+### C087 · Σ|Δ| 1.5 · 1 certs · `hpcdb17974/gas | cavity wall | pitched 175 | PV,ext1`
 - [ ] `100090536443` · L 86 / E 84.52 / Δ -1.48

-### C090 · Σ|Δ| 1.4 · 1 certs · `hpcdb17978/gas | solid brick | flat no | RR,ext1`
+### C088 · Σ|Δ| 1.4 · 1 certs · `hpcdb17978/gas | solid brick | flat no | RR,ext1`
 - [ ] `line80` · L 72 / E 70.56 / Δ -1.44

-### C091 · Σ|Δ| 1.4 · 1 certs · `hpcdb10356/gas | solid brick | pitched 150 | RR,ext1,sec:room heaters`
+### C089 · Σ|Δ| 1.4 · 1 certs · `hpcdb10356/gas | solid brick | pitched 150 | RR,ext1,sec:room heaters`
 - [ ] `100080518673` · L 57 / E 58.42 / Δ +1.42

-### C092 · Σ|Δ| 1.4 · 1 certs · `hpcdb18561/gas | solid brick | pitched 250 | ext2`
+### C090 · Σ|Δ| 1.4 · 1 certs · `hpcdb18561/gas | solid brick | pitched 250 | ext2`
 - [ ] `235025284` · L 69 / E 67.59 / Δ -1.41

-### C093 · Σ|Δ| 1.4 · 1 certs · `hpcdb18767/gas | sandstone as | (another dwelling`
+### C091 · Σ|Δ| 1.4 · 1 certs · `hpcdb18767/gas | sandstone as | (another dwelling`
 - [ ] `250063088` · L 73 / E 71.60 / Δ -1.40

-### C094 · Σ|Δ| 1.4 · 1 certs · `hpcdb18991/fuel28 | solid brick | pitched 250 | sec:room heaters`
+### C092 · Σ|Δ| 1.4 · 1 certs · `hpcdb18991/fuel28 | solid brick | pitched 250 | sec:room heaters`
 - [ ] `100050048691` · L 58 / E 59.39 / Δ +1.39

-### C095 · Σ|Δ| 1.4 · 1 certs · `hpcdb16210/gas | cavity wall | pitched 300 | sec:room heaters`
+### C093 · Σ|Δ| 1.4 · 1 certs · `hpcdb16210/gas | cavity wall | pitched 300 | sec:room heaters`
 - [ ] `100110097281` · L 64 / E 65.37 / Δ +1.37

-### C096 · Σ|Δ| 1.4 · 1 certs · `h691/elec | solid brick | (another dwelling | whw903`
+### C094 · Σ|Δ| 1.4 · 1 certs · `h691/elec | solid brick | (another dwelling | whw903`
 - [ ] `10091630692` · L 58 / E 56.63 / Δ -1.37

-### C097 · Σ|Δ| 1.4 · 1 certs · `hpcdb19094/gas | cavity wall | (another dwelling | ext1,sec:room heaters`
+### C095 · Σ|Δ| 1.4 · 1 certs · `hpcdb19094/gas | cavity wall | (another dwelling | ext1,sec:room heaters`
 - [ ] `100031433810` · L 70 / E 68.63 / Δ -1.37

-### C098 · Σ|Δ| 1.3 · 1 certs · `hpcdb19227/fuel28 | solid brick | pitched 100 | RR,ext3,sec:room heaters`
+### C096 · Σ|Δ| 1.3 · 1 certs · `hpcdb19227/fuel28 | solid brick | pitched 100 | RR,ext3,sec:room heaters`
 - [ ] `100012368622` · L 39 / E 40.32 / Δ +1.32

-### C099 · Σ|Δ| 1.3 · 1 certs · `hpcdb19007/gas | solid brick | pitched insulated | RR,ext2,sec:room heaters`
+### C097 · Σ|Δ| 1.3 · 1 certs · `hpcdb19007/gas | solid brick | pitched insulated | RR,ext2,sec:room heaters`
 - [ ] `90077194` · L 65 / E 63.69 / Δ -1.31

-### C100 · Σ|Δ| 1.3 · 1 certs · `hpcdb19083/gas | cavity wall | pitched 75 | RR,consv2`
+### C098 · Σ|Δ| 1.3 · 1 certs · `hpcdb19083/gas | cavity wall | pitched 75 | RR,consv2`
 - [ ] `100031461986` · L 70 / E 71.29 / Δ +1.29

-### C101 · Σ|Δ| 1.3 · 1 certs · `h691/elec | granite or | pitched insulated | PV,ext3,whw903`
+### C099 · Σ|Δ| 1.3 · 1 certs · `h691/elec | granite or | pitched insulated | PV,ext3,whw903`
 - [ ] `30095054` · L 46 / E 44.74 / Δ -1.26

-### C102 · Σ|Δ| 1.3 · 1 certs · `hpcdb18335/gas | cavity wall | pitched 100 | RR,ext1,sec:room heaters`
+### C100 · Σ|Δ| 1.3 · 1 certs · `hpcdb18335/gas | cavity wall | pitched 100 | RR,ext1,sec:room heaters`
 - [ ] `100100055589` · L 58 / E 59.26 / Δ +1.26

-### C103 · Σ|Δ| 1.2 · 1 certs · `h409/elec | solid brick | (another dwelling | consv2,sec:portable electric,whw909`
+### C101 · Σ|Δ| 1.2 · 1 certs · `h409/elec | solid brick | (another dwelling | consv2,sec:portable electric,whw909`
 - [ ] `74061136` · L 73 / E 71.75 / Δ -1.25 <- electric storage cat7 E7: over-rate = off-peak rate/fraction too generous; needs Elmhurst tariff arbitration

-### C104 · Σ|Δ| 1.2 · 1 certs · `hpcdb15101/gas | cavity wall | pitched 270 | consv3,sec:room heaters`
+### C102 · Σ|Δ| 1.2 · 1 certs · `hpcdb15101/gas | cavity wall | pitched 270 | consv3,sec:room heaters`
 - [ ] `100091435353` · L 65 / E 66.23 / Δ +1.23

-### C105 · Σ|Δ| 1.2 · 2 certs · `h301/coal-anth | system built | (another dwelling`
+### C103 · Σ|Δ| 1.2 · 2 certs · `h301/coal-anth | system built | (another dwelling`
 - [ ] `10091070164` · L 69 / E 69.60 / Δ +0.60
 - [ ] `10090927185` · L 79 / E 79.60 / Δ +0.60

-### C106 · Σ|Δ| 1.2 · 1 certs · `hpcdb19110/gas | cavity wall | pitched no | ext3`
+### C104 · Σ|Δ| 1.2 · 1 certs · `hpcdb19110/gas | cavity wall | pitched no | ext3`
 - [ ] `100100614412` · L 53 / E 51.81 / Δ -1.19

-### C107 · Σ|Δ| 1.2 · 1 certs · `hpcdb18658/gas | solid brick | flat no`
+### C105 · Σ|Δ| 1.2 · 1 certs · `hpcdb18658/gas | solid brick | flat no`
 - [ ] `217091901` · L 62 / E 60.82 / Δ -1.18

-### C108 · Σ|Δ| 1.2 · 1 certs · `hpcdb17115/gas | sandstone as | (another dwelling | ext2,sec:room heaters`
+### C106 · Σ|Δ| 1.2 · 1 certs · `hpcdb17115/gas | sandstone as | (another dwelling | ext2,sec:room heaters`
 - [x] `line768` · L 57 / E 55.84 / Δ -1.16

-### C109 · Σ|Δ| 1.2 · 1 certs · `h102/gas | solid brick | (same dwelling | ext1,sec:portable electric`
+### C107 · Σ|Δ| 1.2 · 1 certs · `h102/gas | solid brick | (same dwelling | ext1,sec:portable electric`
 - [ ] `217061895` · L 61 / E 59.84 / Δ -1.16

-### C110 · Σ|Δ| 1.1 · 1 certs · `hpcdb15708/gas | cavity wall | pitched insulated | RR,sec:room heaters`
+### C108 · Σ|Δ| 1.1 · 1 certs · `hpcdb15708/gas | cavity wall | pitched insulated | RR,sec:room heaters`
 - [ ] `10002349227` · L 76 / E 77.14 / Δ +1.14

-### C111 · Σ|Δ| 1.1 · 1 certs · `hpcdb15451/gas | timber frame | pitched insulated | RR,ext1,sec:room heaters`
+### C109 · Σ|Δ| 1.1 · 1 certs · `hpcdb15451/gas | timber frame | pitched insulated | RR,ext1,sec:room heaters`
 - [ ] `200001634005` · L 66 / E 67.11 / Δ +1.11

-### C112 · Σ|Δ| 1.1 · 1 certs · `hpcdb1770/fuel28 | solid brick | pitched no | ext3,sec:room heaters`
+### C110 · Σ|Δ| 1.1 · 1 certs · `hpcdb1770/fuel28 | solid brick | pitched no | ext3,sec:room heaters`
 - [ ] `200004522639` · L 37 / E 35.89 / Δ -1.11

-### C113 · Σ|Δ| 1.1 · 1 certs · `hpcdb16407/gas | cavity wall | pitched 250 | ext1,sec:room heaters`
+### C111 · Σ|Δ| 1.1 · 1 certs · `hpcdb16407/gas | cavity wall | pitched 250 | ext1,sec:room heaters`
 - [ ] `100071059081` · L 63 / E 64.09 / Δ +1.09

-### C114 · Σ|Δ| 1.1 · 1 certs · `hpcdb19007/gas+2mains | cavity wall | pitched 350 | ext2,mv5,sec:room heaters,whw914`
+### C112 · Σ|Δ| 1.1 · 1 certs · `hpcdb19007/gas+2mains | cavity wall | pitched 350 | ext2,mv5,sec:room heaters,whw914`
 - [ ] `100011820199` · L 55 / E 56.06 / Δ +1.06

-### C115 · Σ|Δ| 1.1 · 1 certs · `h691/elec | system built | (another dwelling | whw903`
+### C113 · Σ|Δ| 1.1 · 1 certs · `h691/elec | system built | (another dwelling | whw903`
 - [ ] `90214753` · L 83 / E 81.95 / Δ -1.05

-### C116 · Σ|Δ| 1.0 · 1 certs · `h102/gas | cavity wall | pitched insulated | consv2`
+### C114 · Σ|Δ| 1.0 · 1 certs · `h102/gas | cavity wall | pitched insulated | consv2`
 - [ ] `100051051866` · L 70 / E 71.04 / Δ +1.04

-### C117 · Σ|Δ| 1.0 · 1 certs · `hpcdb18737/gas | cavity wall | pitched insulated | PV,sec:room heaters`
+### C115 · Σ|Δ| 1.0 · 1 certs · `hpcdb18737/gas | cavity wall | pitched insulated | PV,sec:room heaters`
 - [ ] `10013836852` · L 100 / E 98.97 / Δ -1.03

-### C118 · Σ|Δ| 1.0 · 1 certs · `hpcdb17985/gas | solid brick | (another dwelling`
+### C116 · Σ|Δ| 1.0 · 1 certs · `hpcdb17985/gas | solid brick | (another dwelling`
 - [ ] `line899` · L 73 / E 71.97 / Δ -1.03

-### C119 · Σ|Δ| 1.0 · 1 certs · `hpcdb18524/gas+2mains | cavity wall | pitched 400+ | ext4`
+### C117 · Σ|Δ| 1.0 · 1 certs · `hpcdb18524/gas+2mains | cavity wall | pitched 400+ | ext4`
 - [ ] `40037847` · L 81 / E 79.98 / Δ -1.02

-### C120 · Σ|Δ| 1.0 · 1 certs · `hpcdb19012/gas | cavity wall | pitched insulated`
+### C118 · Σ|Δ| 1.0 · 1 certs · `hpcdb19012/gas | cavity wall | pitched insulated`
 - [ ] `10070056075` · L 80 / E 78.99 / Δ -1.01

-### C121 · Σ|Δ| 1.0 · 1 certs · `hpcdb16843/gas+2mains | cavity wall | pitched insulated | PV,RR,ext2`
+### C119 · Σ|Δ| 1.0 · 1 certs · `hpcdb16843/gas+2mains | cavity wall | pitched insulated | PV,RR,ext2`
 - [ ] `200131078` · L 86 / E 85.00 / Δ -1.00

-### C122 · Σ|Δ| 1.0 · 1 certs · `hpcdb17489/gas | cavity wall | pitched 270 | PV,consv2,ext1,sec:room heaters`
+### C120 · Σ|Δ| 1.0 · 1 certs · `hpcdb17489/gas | cavity wall | pitched 270 | PV,consv2,ext1,sec:room heaters`
 - [ ] `10000245212` · L 101 / E 100.00 / Δ -1.00

-### C123 · Σ|Δ| 1.0 · 1 certs · `h191/elec | solid brick | (another dwelling | ext2,whw909`
+### C121 · Σ|Δ| 1.0 · 1 certs · `h191/elec | solid brick | (another dwelling | ext2,whw909`
 - [ ] `15129162` · L 62 / E 61.00 / Δ -1.00

-### C124 · Σ|Δ| 1.0 · 1 certs · `h301/coal-anth | cavity wall | pitched 270`
+### C122 · Σ|Δ| 1.0 · 1 certs · `h301/coal-anth | cavity wall | pitched 270`
 - [ ] `23032873` · L 73 / E 72.00 / Δ -1.00

-### C125 · Σ|Δ| 1.0 · 1 certs · `hpcdb16930/gas | cavity wall | pitched unknown | RR,ext1,sec:room heaters`
+### C123 · Σ|Δ| 1.0 · 1 certs · `hpcdb16930/gas | cavity wall | pitched unknown | RR,ext1,sec:room heaters`
 - [ ] `45019020` · L 62 / E 61.01 / Δ -0.99

-### C126 · Σ|Δ| 1.0 · 1 certs · `hpcdb17939/gas | solid brick | (another dwelling`
+### C124 · Σ|Δ| 1.0 · 1 certs · `hpcdb17939/gas | solid brick | (another dwelling`
 - [ ] `42065028` · L 59 / E 58.02 / Δ -0.98

-### C127 · Σ|Δ| 1.0 · 1 certs · `hpcdb10071/gas | cavity wall | pitched 150 | RR`
+### C125 · Σ|Δ| 1.0 · 1 certs · `hpcdb10071/gas | cavity wall | pitched 150 | RR`
 - [ ] `10032928147` · L 77 / E 76.04 / Δ -0.96

-### C128 · Σ|Δ| 1.0 · 1 certs · `hpcdb17045/gas | cavity wall | pitched 300`
+### C126 · Σ|Δ| 1.0 · 1 certs · `hpcdb17045/gas | cavity wall | pitched 300`
 - [ ] `10010678937` · L 78 / E 77.04 / Δ -0.96

-### C129 · Σ|Δ| 1.0 · 1 certs · `hpcdb15247/gas | cavity wall | pitched insulated | RR`
+### C127 · Σ|Δ| 1.0 · 1 certs · `hpcdb15247/gas | cavity wall | pitched insulated | RR`
 - [ ] `100011010151` · L 62 / E 62.96 / Δ +0.96

-### C130 · Σ|Δ| 1.0 · 1 certs · `hpcdb16406/gas | solid brick | pitched insulated | RR,consv2,ext2,sec:room heaters`
+### C128 · Σ|Δ| 1.0 · 1 certs · `hpcdb16406/gas | solid brick | pitched insulated | RR,consv2,ext2,sec:room heaters`
 - [ ] `100050477371` · L 65 / E 64.04 / Δ -0.96

-### C131 · Σ|Δ| 0.9 · 1 certs · `hpcdb17529/fuel28 | cavity wall | pitched insulated | RR,ext2,sec:room heaters`
+### C129 · Σ|Δ| 0.9 · 1 certs · `hpcdb17529/fuel28 | cavity wall | pitched insulated | RR,ext2,sec:room heaters`
 - [ ] `10002945522` · L 61 / E 61.94 / Δ +0.94

-### C132 · Σ|Δ| 0.9 · 1 certs · `h691/elec+2mains | cob as | pitched 300 | whw903`
+### C130 · Σ|Δ| 0.9 · 1 certs · `h691/elec+2mains | cob as | pitched 300 | whw903`
 - [ ] `10032957680` · L 45 / E 45.94 / Δ +0.94

-### C133 · Σ|Δ| 0.9 · 1 certs · `hpcdb18204/gas | solid brick | pitched 400+ | PV,ext2`
+### C131 · Σ|Δ| 0.9 · 1 certs · `hpcdb18204/gas | solid brick | pitched 400+ | PV,ext2`
 - [ ] `2465057465` · L 81 / E 81.93 / Δ +0.93

-### C134 · Σ|Δ| 0.9 · 1 certs · `hpcdb19019/gas | solid brick | pitched 100 | ext3,sec:room heaters`
+### C132 · Σ|Δ| 0.9 · 1 certs · `hpcdb19019/gas | solid brick | pitched 100 | ext3,sec:room heaters`
 - [ ] `100090616327` · L 63 / E 63.93 / Δ +0.93

-### C135 · Σ|Δ| 0.9 · 1 certs · `hpcdb17612/gas | cavity wall | pitched 270 | ext1`
+### C133 · Σ|Δ| 0.9 · 1 certs · `hpcdb17612/gas | cavity wall | pitched 270 | ext1`
 - [ ] `100012753833` · L 74 / E 73.07 / Δ -0.93

-### C136 · Σ|Δ| 0.9 · 1 certs · `hpcdb19006/gas | solid brick | pitched 75 | ext1,sec:room heaters`
+### C134 · Σ|Δ| 0.9 · 1 certs · `hpcdb19006/gas | solid brick | pitched 75 | ext1,sec:room heaters`
 - [ ] `100031269525` · L 53 / E 53.91 / Δ +0.91

-### C137 · Σ|Δ| 0.9 · 1 certs · `hpcdb17964/gas | cavity wall | pitched insulated | consv3`
+### C135 · Σ|Δ| 0.9 · 1 certs · `hpcdb17964/gas | cavity wall | pitched insulated | consv3`
 - [ ] `200003725358` · L 75 / E 74.09 / Δ -0.91

-### C138 · Σ|Δ| 0.9 · 1 certs · `hpcdb17507/gas | solid brick | pitched insulated | RR,ext3`
+### C136 · Σ|Δ| 0.9 · 1 certs · `hpcdb17507/gas | solid brick | pitched insulated | RR,ext3`
 - [ ] `100050986162` · L 62 / E 61.10 / Δ -0.90

-### C139 · Σ|Δ| 0.9 · 1 certs · `hpcdb17985/gas | cavity wall | (another dwelling | mv2`
+### C137 · Σ|Δ| 0.9 · 1 certs · `hpcdb17985/gas | cavity wall | (another dwelling | mv2`
 - [ ] `5300000141` · L 78 / E 77.10 / Δ -0.90

-### C140 · Σ|Δ| 0.9 · 1 certs · `hpcdb18616/gas | cavity wall | pitched 250 | sec:room heaters`
+### C138 · Σ|Δ| 0.9 · 1 certs · `hpcdb18616/gas | cavity wall | pitched 250 | sec:room heaters`
 - [ ] `100050618404` · L 73 / E 73.89 / Δ +0.89

-### C141 · Σ|Δ| 0.9 · 1 certs · `hpcdb17507/gas | cavity wall | pitched 250 | PV,ext1`
+### C139 · Σ|Δ| 0.9 · 1 certs · `hpcdb17507/gas | cavity wall | pitched 250 | PV,ext1`
 - [ ] `100090476016` · L 81 / E 81.89 / Δ +0.89

-### C142 · Σ|Δ| 0.9 · 1 certs · `h691/elec | timber frame | pitched 200 | RR,ext3,whw903`
+### C140 · Σ|Δ| 0.9 · 1 certs · `h691/elec | timber frame | pitched 200 | RR,ext3,whw903`
 - [ ] `10012119141` · L 45 / E 45.89 / Δ +0.89

-### C143 · Σ|Δ| 0.9 · 1 certs · `h524/elec | cavity wall | pitched 300 | PV`
+### C141 · Σ|Δ| 0.9 · 1 certs · `h524/elec | cavity wall | pitched 300 | PV`
 - [ ] `100040938206` · L 75 / E 75.89 / Δ +0.89

-### C144 · Σ|Δ| 0.9 · 1 certs · `hpcdb18234/gas | cavity wall | pitched insulated | RR,consv2`
+### C142 · Σ|Δ| 0.9 · 1 certs · `hpcdb18234/gas | cavity wall | pitched insulated | RR,consv2`
 - [ ] `38188474` · L 76 / E 76.87 / Δ +0.87

-### C145 · Σ|Δ| 0.9 · 1 certs · `hpcdb16777/gas | cavity wall | pitched 100 | ext1,sec:room heaters`
+### C143 · Σ|Δ| 0.9 · 1 certs · `hpcdb16777/gas | cavity wall | pitched 100 | ext1,sec:room heaters`
 - [ ] `100061194957` · L 69 / E 69.87 / Δ +0.87

-### C146 · Σ|Δ| 0.9 · 1 certs · `hpcdb18559/gas+2mains | solid brick | pitched 200 | whw914`
+### C144 · Σ|Δ| 0.9 · 1 certs · `hpcdb18559/gas+2mains | solid brick | pitched 200 | whw914`
 - [ ] `100021236527` · L 72 / E 71.13 / Δ -0.87

-### C147 · Σ|Δ| 0.9 · 1 certs · `hpcdb18907/gas | cavity wall | pitched 270 | consv2`
+### C145 · Σ|Δ| 0.9 · 1 certs · `hpcdb18907/gas | cavity wall | pitched 270 | consv2`
 - [ ] `100040193752` · L 71 / E 71.86 / Δ +0.86

-### C148 · Σ|Δ| 0.9 · 1 certs · `hpcdb10327/gas | cavity wall | (another dwelling`
+### C146 · Σ|Δ| 0.9 · 1 certs · `hpcdb10327/gas | cavity wall | (another dwelling`
 - [ ] `100060701552` · L 74 / E 74.86 / Δ +0.86

-### C149 · Σ|Δ| 0.9 · 1 certs · `h691/elec | system built | flat insulated | whw903`
+### C147 · Σ|Δ| 0.9 · 1 certs · `h691/elec | system built | flat insulated | whw903`
 - [ ] `10070396146` · L 61 / E 60.14 / Δ -0.86

-### C150 · Σ|Δ| 0.8 · 1 certs · `hpcdb8587/gas | cavity wall | (another dwelling`
+### C148 · Σ|Δ| 0.8 · 1 certs · `hpcdb8587/gas | cavity wall | (another dwelling`
 - [ ] `100030528930` · L 74 / E 73.16 / Δ -0.84

-### C151 · Σ|Δ| 0.8 · 1 certs · `hpcdb18212/gas | solid brick | (another dwelling`
+### C149 · Σ|Δ| 0.8 · 1 certs · `hpcdb18212/gas | solid brick | (another dwelling`
 - [ ] `100020982570` · L 72 / E 71.17 / Δ -0.83

-### C152 · Σ|Δ| 0.8 · 1 certs · `hpcdb16888/gas | cavity wall | pitched 350 | consv2`
+### C150 · Σ|Δ| 0.8 · 1 certs · `hpcdb16888/gas | cavity wall | pitched 350 | consv2`
 - [ ] `394024487` · L 75 / E 74.17 / Δ -0.83

-### C153 · Σ|Δ| 0.8 · 1 certs · `hpcdb17503/gas | solid brick | pitched insulated | RR,ext1,mv4`
+### C151 · Σ|Δ| 0.8 · 1 certs · `hpcdb17503/gas | solid brick | pitched insulated | RR,ext1,mv4`
 - [ ] `217070698` · L 78 / E 78.83 / Δ +0.83

-### C154 · Σ|Δ| 0.8 · 1 certs · `hpcdb15709/gas | cavity wall | (another dwelling | ext1`
+### C152 · Σ|Δ| 0.8 · 1 certs · `hpcdb15709/gas | cavity wall | (another dwelling | ext1`
 - [ ] `77022508` · L 69 / E 68.18 / Δ -0.82

-### C155 · Σ|Δ| 0.8 · 1 certs · `hpcdb18496/gas | cavity wall | pitched 250 | RR,consv4`
+### C153 · Σ|Δ| 0.8 · 1 certs · `hpcdb18496/gas | cavity wall | pitched 250 | RR,consv4`
 - [ ] `100040259104` · L 68 / E 68.82 / Δ +0.82

-### C156 · Σ|Δ| 0.8 · 1 certs · `hpcdb18559/gas | solid brick | pitched 270 | ext1`
+### C154 · Σ|Δ| 0.8 · 1 certs · `hpcdb18559/gas | solid brick | pitched 270 | ext1`
 - [ ] `100031399026` · L 70 / E 70.81 / Δ +0.81

-### C157 · Σ|Δ| 0.8 · 1 certs · `hpcdb16374/gas | cavity wall | pitched unknown`
+### C155 · Σ|Δ| 0.8 · 1 certs · `hpcdb16374/gas | cavity wall | pitched unknown`
 - [ ] `10009645698` · L 67 / E 67.81 / Δ +0.81

-### C158 · Σ|Δ| 0.8 · 1 certs · `hpcdb16395/gas | timber frame | thatched with | ext1,sec:room heaters`
+### C156 · Σ|Δ| 0.8 · 1 certs · `hpcdb16395/gas | timber frame | thatched with | ext1,sec:room heaters`
 - [ ] `100080818887` · L 56 / E 55.19 / Δ -0.81

-### C159 · Σ|Δ| 0.8 · 1 certs · `hpcdb16835/gas | solid brick | pitched insulated | RR,ext1`
+### C157 · Σ|Δ| 0.8 · 1 certs · `hpcdb16835/gas | solid brick | pitched insulated | RR,ext1`
 - [ ] `100012374381` · L 69 / E 69.80 / Δ +0.80

-### C160 · Σ|Δ| 0.8 · 1 certs · `hpcdb17560/gas | cavity wall | pitched 250 | ext2`
+### C158 · Σ|Δ| 0.8 · 1 certs · `hpcdb17560/gas | cavity wall | pitched 250 | ext2`
 - [ ] `100012350270` · L 78 / E 77.20 / Δ -0.80

-### C161 · Σ|Δ| 0.8 · 1 certs · `hpcdb15166/gas+2mains | sandstone as | pitched no | PV,ext4,sec:room heaters,whw914`
+### C159 · Σ|Δ| 0.8 · 1 certs · `hpcdb15166/gas+2mains | sandstone as | pitched no | PV,ext4,sec:room heaters,whw914`
 - [ ] `100051109723` · L 60 / E 60.78 / Δ +0.78

-### C162 · Σ|Δ| 0.8 · 1 certs · `hpcdb18911/gas | cavity wall | pitched 50 | consv4`
+### C160 · Σ|Δ| 0.8 · 1 certs · `hpcdb18911/gas | cavity wall | pitched 50 | consv4`
 - [ ] `100061616915` · L 63 / E 62.22 / Δ -0.78

-### C163 · Σ|Δ| 0.8 · 1 certs · `h691/elec | cavity wall | pitched 200 | whw903`
+### C161 · Σ|Δ| 0.8 · 1 certs · `h691/elec | cavity wall | pitched 200 | whw903`
 - [ ] `line71` · L 74 / E 74.77 / Δ +0.77

-### C164 · Σ|Δ| 0.8 · 1 certs · `hpcdb17986/gas | cavity wall | (another dwelling`
+### C162 · Σ|Δ| 0.8 · 1 certs · `hpcdb17986/gas | cavity wall | (another dwelling`
 - [ ] `100011603934` · L 72 / E 71.23 / Δ -0.77

-### C165 · Σ|Δ| 0.8 · 1 certs · `hpcdb10244/gas | cavity wall | pitched 100`
+### C163 · Σ|Δ| 0.8 · 1 certs · `hpcdb10244/gas | cavity wall | pitched 100`
 - [ ] `24030987` · L 73 / E 73.76 / Δ +0.76

-### C166 · Σ|Δ| 0.8 · 1 certs · `h193/elec | solid brick | (another dwelling | whw909`
+### C164 · Σ|Δ| 0.8 · 1 certs · `h193/elec | solid brick | (another dwelling | whw909`
 - [ ] `100032043038` · L 74 / E 73.24 / Δ -0.76

-### C167 · Σ|Δ| 0.8 · 1 certs · `hpcdb17513/gas | cavity wall | pitched unknown`
+### C165 · Σ|Δ| 0.8 · 1 certs · `hpcdb17513/gas | cavity wall | pitched unknown`
 - [ ] `100010866608` · L 71 / E 70.24 / Δ -0.76

-### C168 · Σ|Δ| 0.7 · 1 certs · `hpcdb17965/gas | cavity wall | pitched insulated | RR,ext1,sec:room heaters`
+### C166 · Σ|Δ| 0.7 · 1 certs · `hpcdb17965/gas | cavity wall | pitched insulated | RR,ext1,sec:room heaters`
 - [ ] `100090399615` · L 67 / E 67.75 / Δ +0.75

-### C169 · Σ|Δ| 0.7 · 1 certs · `h691/elec | solid brick | roof room(s) | RR,ext2,sec:room heaters,whw903`
+### C167 · Σ|Δ| 0.7 · 1 certs · `h691/elec | solid brick | roof room(s) | RR,ext2,sec:room heaters,whw903`
 - [ ] `100062174575` · L 46 / E 46.75 / Δ +0.75

-### C170 · Σ|Δ| 0.7 · 1 certs · `hpcdb17576/gas | cavity wall | pitched insulated | RR,consv2`
+### C168 · Σ|Δ| 0.7 · 1 certs · `hpcdb16137/gas | solid brick | pitched 150`
+- [ ] `200004296092` · L 71 / E 71.74 / Δ +0.74
+
+### C169 · Σ|Δ| 0.7 · 1 certs · `hpcdb17576/gas | cavity wall | pitched insulated | RR,consv2`
 - [ ] `10012341135` · L 79 / E 79.73 / Δ +0.73

-### C171 · Σ|Δ| 0.7 · 1 certs · `h409/elec | cavity wall | (another dwelling | sec:portable electric,whw903`
+### C170 · Σ|Δ| 0.7 · 1 certs · `h409/elec | cavity wall | (another dwelling | sec:portable electric,whw903`
 - [ ] `100091005853` · L 70 / E 69.27 / Δ -0.73

-### C172 · Σ|Δ| 0.7 · 1 certs · `hpcdb18908/gas | cavity wall | pitched 175`
+### C171 · Σ|Δ| 0.7 · 1 certs · `hpcdb18908/gas | cavity wall | pitched 175`
 - [ ] `100021533514` · L 71 / E 71.73 / Δ +0.73

-### C173 · Σ|Δ| 0.7 · 1 certs · `h301/coal-anth | solid brick | (another dwelling`
+### C172 · Σ|Δ| 0.7 · 1 certs · `h301/coal-anth | solid brick | (another dwelling`
 - [ ] `5062075` · L 69 / E 69.72 / Δ +0.72

-### C174 · Σ|Δ| 0.7 · 1 certs · `hpcdb18112/gas | cavity wall | pitched 100 | RR,ext1`
+### C173 · Σ|Δ| 0.7 · 1 certs · `hpcdb18112/gas | cavity wall | pitched 100 | RR,ext1`
 - [ ] `100040813308` · L 62 / E 62.72 / Δ +0.72

-### C175 · Σ|Δ| 0.7 · 1 certs · `h104/gas | solid brick | pitched unknown | ext2`
+### C174 · Σ|Δ| 0.7 · 1 certs · `h104/gas | solid brick | pitched unknown | ext2`
 - [ ] `38105600` · L 68 / E 67.28 / Δ -0.72

-### C176 · Σ|Δ| 0.7 · 1 certs · `h104/gas | solid brick | pitched 200`
+### C175 · Σ|Δ| 0.7 · 1 certs · `h104/gas | solid brick | pitched 200`
 - [ ] `line255` · L 72 / E 71.29 / Δ -0.71

-### C177 · Σ|Δ| 0.7 · 1 certs · `h304/elec | cavity wall | (another dwelling | whw950`
+### C176 · Σ|Δ| 0.7 · 1 certs · `h304/elec | cavity wall | (another dwelling | whw950`
 - [ ] `5300047580` · L 69 / E 68.30 / Δ -0.70

-### C178 · Σ|Δ| 0.7 · 1 certs · `h104/gas | cavity wall | pitched 250 | ext1`
+### C177 · Σ|Δ| 0.7 · 1 certs · `h104/gas | cavity wall | pitched 250 | ext1`
 - [ ] `100110433403` · L 69 / E 68.32 / Δ -0.68

-### C179 · Σ|Δ| 0.7 · 1 certs · `hpcdb16835/gas | cavity wall | pitched insulated`
+### C178 · Σ|Δ| 0.7 · 1 certs · `hpcdb16835/gas | cavity wall | pitched insulated`
 - [ ] `10093416558` · L 79 / E 78.32 / Δ -0.68

-### C180 · Σ|Δ| 0.7 · 1 certs · `hpcdb18251/gas | solid brick | pitched 100`
+### C179 · Σ|Δ| 0.7 · 1 certs · `hpcdb18251/gas | solid brick | pitched 100`
 - [ ] `100050958217` · L 68 / E 68.68 / Δ +0.68

-### C181 · Σ|Δ| 0.7 · 1 certs · `hpcdb18224/gas | solid brick | pitched 225 | ext1`
+### C180 · Σ|Δ| 0.7 · 1 certs · `hpcdb18224/gas | solid brick | pitched 225 | ext1`
 - [ ] `100022667797` · L 68 / E 67.32 / Δ -0.68

-### C182 · Σ|Δ| 0.7 · 1 certs · `hpcdb10243/gas | cavity wall | pitched insulated | RR,sec:room heaters`
+### C181 · Σ|Δ| 0.7 · 1 certs · `hpcdb10243/gas | cavity wall | pitched insulated | RR,sec:room heaters`
 - [ ] `100030528925` · L 78 / E 78.65 / Δ +0.65

-### C183 · Σ|Δ| 0.6 · 1 certs · `hpcdb17657/gas | cavity wall | (another dwelling`
+### C182 · Σ|Δ| 0.6 · 1 certs · `hpcdb17657/gas | cavity wall | (another dwelling`
 - [ ] `100110300037` · L 74 / E 73.35 / Δ -0.65

-### C184 · Σ|Δ| 0.6 · 1 certs · `hpcdb2044/gas | solid brick | (another dwelling | ext1`
+### C183 · Σ|Δ| 0.6 · 1 certs · `hpcdb2044/gas | solid brick | (another dwelling | ext1`
 - [ ] `217092450` · L 52 / E 52.64 / Δ +0.64

-### C185 · Σ|Δ| 0.6 · 1 certs · `hpcdb15101/gas | solid brick | pitched 300`
+### C184 · Σ|Δ| 0.6 · 1 certs · `hpcdb15101/gas | solid brick | pitched 300`
 - [ ] `100061164545` · L 72 / E 71.36 / Δ -0.64

-### C186 · Σ|Δ| 0.6 · 1 certs · `hpcdb10328/gas | cavity wall | pitched unknown`
+### C185 · Σ|Δ| 0.6 · 1 certs · `hpcdb10328/gas | cavity wall | pitched unknown`
 - [ ] `100051075936` · L 71 / E 70.36 / Δ -0.64

-### C187 · Σ|Δ| 0.6 · 1 certs · `hpcdb17507/gas | cavity wall | roof room(s) | RR,sec:room heaters`
+### C186 · Σ|Δ| 0.6 · 1 certs · `hpcdb17507/gas | cavity wall | roof room(s) | RR,sec:room heaters`
 - [ ] `100011565830` · L 72 / E 72.64 / Δ +0.64

-### C188 · Σ|Δ| 0.6 · 1 certs · `hpcdb15700/gas | sandstone with | pitched 100 | RR,sec:room heaters`
+### C187 · Σ|Δ| 0.6 · 1 certs · `hpcdb15700/gas | sandstone with | pitched 100 | RR,sec:room heaters`
 - [ ] `61010956` · L 75 / E 74.37 / Δ -0.63

-### C189 · Σ|Δ| 0.6 · 1 certs · `hpcdb17115/gas+2mains | cavity wall | pitched insulated | RR,ext4,sec:room heaters`
+### C188 · Σ|Δ| 0.6 · 1 certs · `hpcdb17115/gas+2mains | cavity wall | pitched insulated | RR,ext4,sec:room heaters`
 - [ ] `100110752514` · L 67 / E 67.62 / Δ +0.62

-### C190 · Σ|Δ| 0.6 · 1 certs · `h404/elec | cavity wall | pitched 175 | sec:room heaters,whw909`
+### C189 · Σ|Δ| 0.6 · 1 certs · `h404/elec | cavity wall | pitched 175 | sec:room heaters,whw909`
 - [ ] `100070295212` · L 75 / E 74.38 / Δ -0.62

-### C191 · Σ|Δ| 0.6 · 1 certs · `hpcdb18766/gas+2mains | sandstone as | pitched 100 | RR`
+### C190 · Σ|Δ| 0.6 · 1 certs · `hpcdb18766/gas+2mains | sandstone as | pitched 100 | RR`
 - [ ] `100012534027` · L 65 / E 64.38 / Δ -0.62

-### C192 · Σ|Δ| 0.6 · 1 certs · `hpcdb9058/fuel28 | solid brick | pitched 100 | RR,ext2,sec:room heaters`
+### C191 · Σ|Δ| 0.6 · 1 certs · `hpcdb9058/fuel28 | solid brick | pitched 100 | RR,ext2,sec:room heaters`
 - [x] `10009812472` · L 40 / E 39.40 / Δ -0.60

-### C193 · Σ|Δ| 0.6 · 1 certs · `hpcdb18218/gas | solid brick | (another dwelling`
+### C192 · Σ|Δ| 0.6 · 1 certs · `hpcdb18218/gas | solid brick | (another dwelling`
 - [ ] `34080035` · L 77 / E 76.41 / Δ -0.59

-### C194 · Σ|Δ| 0.6 · 1 certs · `hpcdb16137/gas | cavity wall | pitched 150 | RR,ext1`
+### C193 · Σ|Δ| 0.6 · 1 certs · `hpcdb16137/gas | cavity wall | pitched 150 | RR,ext1`
 - [ ] `21032732` · L 69 / E 69.59 / Δ +0.59

-### C195 · Σ|Δ| 0.6 · 1 certs · `h101/gas | cavity wall | pitched 100 | RR,ext1`
+### C194 · Σ|Δ| 0.6 · 1 certs · `h101/gas | cavity wall | pitched 100 | RR,ext1`
 - [ ] `100060562056` · L 66 / E 65.41 / Δ -0.59

-### C196 · Σ|Δ| 0.6 · 1 certs · `hpcdb17514/fuel27 | cavity wall | pitched 400+ | PV,ext2`
+### C195 · Σ|Δ| 0.6 · 1 certs · `hpcdb17514/fuel27 | cavity wall | pitched 400+ | PV,ext2`
 - [ ] `100091086558` · L 79 / E 79.58 / Δ +0.58

-### C197 · Σ|Δ| 0.6 · 1 certs · `hpcdb18908/gas | solid brick | (another dwelling`
+### C196 · Σ|Δ| 0.6 · 1 certs · `hpcdb18908/gas | solid brick | (another dwelling`
 - [ ] `line599` · L 74 / E 73.42 / Δ -0.58

-### C198 · Σ|Δ| 0.6 · 1 certs · `hpcdb17973/gas | cavity wall | pitched insulated`
+### C197 · Σ|Δ| 0.6 · 1 certs · `hpcdb17973/gas | cavity wall | pitched insulated`
 - [ ] `100020407741` · L 72 / E 71.42 / Δ -0.58

-### C199 · Σ|Δ| 0.6 · 1 certs · `hpcdb19007/gas | cavity wall | pitched 200 | consv2,ext1,sec:room heaters`
+### C198 · Σ|Δ| 0.6 · 1 certs · `hpcdb19007/gas | cavity wall | pitched 200 | consv2,ext1,sec:room heaters`
 - [ ] `100050839457` · L 70 / E 70.57 / Δ +0.57

-### C200 · Σ|Δ| 0.6 · 1 certs · `hpcdb19007/gas | solid brick | pitched insulated | RR,sec:room heaters`
+### C199 · Σ|Δ| 0.6 · 1 certs · `hpcdb19007/gas | solid brick | pitched insulated | RR,sec:room heaters`
 - [ ] `42105250` · L 59 / E 59.57 / Δ +0.57

-### C201 · Σ|Δ| 0.6 · 1 certs · `hpcdb1917/gas | timber frame | pitched insulated`
+### C200 · Σ|Δ| 0.6 · 1 certs · `hpcdb1917/gas | timber frame | pitched insulated`
 - [ ] `77200509` · L 69 / E 69.57 / Δ +0.57

-### C202 · Σ|Δ| 0.6 · 1 certs · `hpcdb10356/gas | cavity wall | pitched insulated | ext2`
+### C201 · Σ|Δ| 0.6 · 1 certs · `hpcdb10356/gas | cavity wall | pitched insulated | ext2`
 - [ ] `200040534` · L 65 / E 65.56 / Δ +0.56

+### C202 · Σ|Δ| 0.6 · 1 certs · `hpcdb17507/gas | solid brick | pitched 150 | ext1,mv2`
+- [ ] `200049463` · L 69 / E 69.56 / Δ +0.56
+
 ### C203 · Σ|Δ| 0.6 · 1 certs · `h126/fuel28+2mains | cavity wall | pitched 300 | RR,consv2,ext3,sec:room heaters`
 - [ ] `100062527568` · L 61 / E 61.56 / Δ +0.56

@ -839,6 +839,7 @@ Statuses: `[ ]` todo · `[x]` resolved ≤0.5 · 🔧 fix landed · ⚠ xfail en
 - [x] `100050553337` · L 70 / E 69.60 / Δ -0.40 · `hpcdb16839/gas | cavity wall | pitched 270 | sec:room heaters`
 - [x] `100071356612` · L 69 / E 68.61 / Δ -0.39 · `h301/coal-anth | solid brick | (another dwelling`
 - [x] `74041417` · L 79 / E 79.39 / Δ +0.39 · `hpcdb17507/gas | cavity wall | pitched 300 | PV`
+- [x] `100110452552` · L 67 / E 67.39 / Δ +0.39 · `hpcdb15068/gas | cavity wall | pitched 175 | mv2,sec:room heaters`
 - [x] `100022607800` · L 73 / E 72.61 / Δ -0.39 · `hpcdb18119/gas | solid brick | pitched 270`
 - [x] `100022277442` · L 58 / E 58.39 / Δ +0.39 · `h409/elec | cavity wall | pitched insulated | whw903`
 - [x] `250029611` · L 73 / E 72.61 / Δ -0.39 · `hpcdb17553/gas | cavity wall | pitched 250 | consv2,ext1`
@ -885,7 +886,6 @@ Statuses: `[ ]` todo · `[x]` resolved ≤0.5 · 🔧 fix landed · ⚠ xfail en
 - [x] `1775087250` · L 75 / E 74.63 / Δ -0.37 · `hpcdb18861/gas | cavity wall | pitched 250 | ext1`
 - [x] `100061253556` · L 60 / E 59.63 / Δ -0.37 · `hpcdb18907/gas | cavity wall | pitched 100 | sec:room heaters`
 - [x] `6083595` · L 76 / E 76.37 / Δ +0.37 · `hpcdb17685/gas | cavity wall | pitched insulated`
- [x] `100110452552` · L 67 / E 66.64 / Δ -0.36 · `hpcdb15068/gas | cavity wall | pitched 175 | mv2,sec:room heaters`
 - [x] `200033141` · L 76 / E 75.64 / Δ -0.36 · `hpcdb16738/gas | cavity wall | flat insulated`
 - [x] `100030357741` · L 72 / E 72.36 / Δ +0.36 · `hpcdb18560/gas | cavity wall | pitched 300 | consv2,ext1`
 - [x] `100080707176` · L 72 / E 71.64 / Δ -0.36 · `hpcdb10243/gas | cavity wall | pitched 100`
--- a/tests/domain/sap10_calculator/test_real_cert_sap_accuracy.py
+++ b/tests/domain/sap10_calculator/test_real_cert_sap_accuracy.py
@ -774,6 +774,22 @@ _EXPECTATIONS: Final[tuple[RealCertExpectation, ...]] = (
        cert_num="uprn-74061136",
        sap_score=72,
    ),
+    # UPRN 200004296092 (corpus; no cert number lodged). RdSAP-21.0.1 native —
+    # END-TERRACE HOUSE, TFA 62, age B, mains-gas COMBI (PCDB 16137), SOLID
+    # BRICK 360 mm "with external insulation" (wall_insulation_type 1) but
+    # thickness lodged "NI" (unknown). The wall added-insulation unknown-
+    # thickness cert: the §5.8 R-value gate needs thickness > 0, so the
+    # externally-insulated wall fell through to its UNINSULATED §5.6 U (1.40,
+    # walls 101.7 W/K, HLP 3.46) → PE +59.6, engine 64.35 (Δ −6.65 vs lodged
+    # 71). RdSAP 10 §5.4 (PDF p.32) "assume 100 mm if thickness is unknown"
+    # applies the 100 mm §5.8 default → U ~0.29, engine 71.74 = lodged. PINNED
+    # to the observed engine 72.
+    RealCertExpectation(
+        schema="RdSAP-Schema-21.0.1",
+        sample="uprn_200004296092",
+        cert_num="uprn-200004296092",
+        sap_score=72,
+    ),
 )


--- a/tests/infrastructure/epc_client/test_sap_accuracy_corpus.py
+++ b/tests/infrastructure/epc_client/test_sap_accuracy_corpus.py
@ -295,7 +295,16 @@ _MIN_WITHIN_HALF_SAP = 0.770
 # and heats on demand -> 100% high rate. Cert 74061136 (HHR-storage flat,
 # WHC 909) +7.72 -> -1.25. Both the cost rate and the ADR-0014/CO2-PE fraction
 # fixed (fraction 0 -> 1.0). Unit-pinned in test_cert_to_inputs.
-_MAX_SAP_MAE = 0.659
+# 0.659 -> 0.648 via the wall added-insulation unknown-thickness fix: a
+# SOLID-BRICK/STONE wall lodging External/Internal insulation (type 1/3) with
+# thickness "NI" (unknown) was billed UNINSULATED (§5.8 R-value gate needs a
+# thickness > 0), over-counting wall heat loss. RdSAP 10 §5.4 (PDF p.32):
+# "assume 100 mm if thickness is unknown" -> apply the 100 mm §5.8 default.
+# Cert 200004296092 (age-B solid brick 360 mm + external, NI): walls 101.7 W/K
+# (U~1.4) -> ~0.29, PE +59.6 -> ~0, SAP 64.35 -> 71.74 (lodged 71). Scoped to
+# brick/stone (the only §5.8 R-value path); within-0.5 held at 77.0%, MAE
+# 0.658 -> 0.647, PE 3.2 -> 3.1. Unit-pinned in test_rdsap_uvalues.
+_MAX_SAP_MAE = 0.648
 _MAX_CO2_MAE_TONNES = 0.075     # t CO2 / yr vs co2_emissions_current
 _MAX_PE_PER_M2_MAE = 3.2        # kWh / m2 / yr vs energy_consumption_current