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Pin the Dovestone water-only community DHW cert recovering to SAP 80 🟩
Full-SAP SAP-Schema-18.0.0 cert 9556-3047-3304-5355-1200 (Dovestone Gardens Apt 4): communal heat-pump DHW + direct-electric room heaters. Was 67 (D) with DHW mis-billed as direct-electric immersion; now 80 with DHW on the community heat-pump fuel. Accredited Elmhurst worksheet 74 (evidence saved); the +6 is the documented full-SAP measured-U/MVHR vs RdSAP age-band residual. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DX8oAGsGkBHq3U4dsxYRzz
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# Elmhurst RdSAP inputs — UPRN 10094112770 (cert 9556-3047-3304-5355-1200, SAP-Schema-18.0.0)
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**Lodged SAP:** 81 (B) **Our engine:** 67 (D) ← compare Elmhurst against this
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**Property:** Apartment 4, Dovestone Gardens, Briercliffe Road, BURNLEY, BB10 1BB (Calico portfolio 824, property 748351)
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**Known divergence (the whole point of this cert):** the dwelling has **direct-electric
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room heaters for space heat** + a **WATER-ONLY communal heat network for hot water**
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(`water_heating_code 950`, `community_heating_use 2`; network = 90 % heat pump COP 3.24
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+ 10 % boiler). Our engine drops the community DHW system and prices hot water as **raw
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direct electric immersion** — 2,675 kWh ≈ £660 vs **lodged DHW cost £147**. That ~£500
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DHW error is what drags lodged B/81 → effective D/67. Build the **Community Hot Water**
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page below faithfully so Elmhurst prices DHW on the heat-pump network; that is the number
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we are reconciling to. PR #1688 does not fix this case (its community mapping is gated on
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a category-6 *main*; here the main is category-10 electric).
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---
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## Property Description
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| Elmhurst field | Value | Notes (SAP code / EES path) |
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|---|---|---|
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| Property type | Flat | `property_type` 2 |
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| Built form | End-terrace | `built_form` 3 |
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| Flat position / which floor | Ground floor | `dwelling_type` = Ground-floor flat |
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| Storeys in dwelling | 1 | single-storey flat |
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| Above another dwelling? | No (ground floor) | floor is exposed/over unheated |
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| Below another dwelling? | **Yes** | roof element = "(other premises above)" → no roof heat loss |
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| Age band | **M — 2023 onwards** | 2025 inspection, genuine new build (band M is correct here) |
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| Region | North West | BB (Burnley) |
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| Country | England | `country_code` ENG |
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## Dimensions
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| Elmhurst field | Value | Notes |
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|---|---|---|
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| Total floor area | **58 m²** | `total_floor_area` 58; single building part "Main Dwelling" |
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| Living area | 22.57 m² | `living_area` (→ living-area fraction 0.39; habitable rooms ≈ 3) |
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| Room height | ≈ 2.4 m | not lodged in full-SAP payload; use standard new-build flat height |
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| Exposed (external) wall area | **37.01 m² gross** | External Wall 1, `total_wall_area` 37.01, U 0.19 (net of ~14.7 m² openings) |
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| Heat-loss perimeter | derive from 37.01 m² gross wall ÷ room height | full SAP lodges wall *area*, not perimeter |
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## Walls
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| Elmhurst field | Value | Notes |
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|---|---|---|
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| Wall construction | As built / measured U | `walls` = "Average thermal transmittance 0.19 W/m²K" |
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| Wall U-value | **0.19 W/m²K** | External Wall 1, `wall_type` 2 |
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| Party wall | **Present — 2 party walls, U = 0** | `wall_type` 4, areas 21.02 + 15.98 m² (Elmhurst "Party wall" = adiabatic, no heat loss) |
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## Roofs
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| Elmhurst field | Value | Notes |
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|---|---|---|
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| Roof | **None / other premises above** | `roofs` = "(other premises above)" → 0 heat loss (flat below another dwelling) |
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## Floors
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| Elmhurst field | Value | Notes |
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|---|---|---|
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| Floor | As built / measured U | `floors` = "Average thermal transmittance 0.17 W/m²K" |
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| Floor U-value | **0.17 W/m²K** | ground floor of the flat |
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## Openings — Windows
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| Elmhurst field | Value | Notes |
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|---|---|---|
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| Glazing type | High performance / triple or advanced double | `windows` = "High performance glazing", glazing_type 6, 100 % multiple glazed |
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| Window U-value | **1.4 W/m²K** | joined opening-type U |
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| Glazed area | as measured | 4 openings totalling ≈ 14.7 m² (W1 0.91×2.24, W2 1.58×2.24, W3+W4 7.08×1.0, W5 0.91×2.24); orientations NE/NW |
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| Doors | **none** | `door_count` 0 (flat entrance internal / no external door lodged) |
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## Ventilation & Lighting
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| Elmhurst field | Value | Notes |
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|---|---|---|
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| Ventilation type | **MEV (mechanical extract)** | `ventilation_type` 8; PCDB index **500167**, duct type 2 (rigid), insulated |
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| Air permeability | **3.2 m³/h·m² (as tested)** | pressure test = yes |
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| Wet rooms | 2 | |
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| Sheltered sides | 2 | |
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| Lighting | **100 % low-energy** | 10 of 10 fixed outlets low-energy |
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## Space Heating — Main Heating 1
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| Elmhurst field | Value | Notes |
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|---|---|---|
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| Main heat source | **Room heaters, electric** | `main_heating` desc; SAP code **691**, category 10, fuel 39 (electricity) |
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| Emitter | n/a (direct-acting electric) | emitter_temperature "NA" |
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| Main heating fraction | 1.0 | single main |
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| Controls | **Programmer + appliance thermostats** | `main_heating_controls`; control code 2603 |
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| Secondary heating | **None** | `secondary_heating` = None |
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## Space Heating — Meters
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| Elmhurst field | Value | Notes |
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|---|---|---|
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| Electricity tariff / meter | **Standard (single rate)** | `electricity_tariff` 1 — **NOT** Economy 7, so the off-peak over-rating bug does not apply here |
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## Water Heating — **Community Hot Water** (the reconciliation target)
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| Elmhurst field | Value | Notes |
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|---|---|---|
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| Water heating type | **Community / communal heat network** | `water_heating_code` **950** = water-only heat network; `hot_water` desc "Community scheme" |
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| Community use | **Water heating only** | `community_heating_use` 2 (space heat is NOT on the network) |
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| Heat source 1 | **Heat pump**, **90 %** heat fraction, **efficiency 324 %** (COP 3.24) | `heat_source_type` 3, `fuel_type` 41, `heat_efficiency` 324, `heat_fraction` 0.9 |
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| Heat source 2 | **Boiler**, **10 %** heat fraction, efficiency **100 %** | `heat_source_type` 2, `fuel_type` 41, `heat_fraction` 0.1 |
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| Distribution loss / type | **Type 3** | `community_heating_distribution_type` 3 |
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| Charging linked to use | **Yes** | `charging_linked_to_heat_use` true |
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| Cylinder in dwelling | **No** | `is_community_heating_cylinder_in_dwelling` false — no in-dwelling store |
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| (cross-check) lodged DHW cost | **£147/yr** | this is the figure the correct build should land near |
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## Anchors to check against Elmhurst output
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| Quantity | Lodged (cert) | Our engine (buggy) |
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|---|---|---|
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| SAP | **81 B** | 67 D |
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| Heating cost | £374 | ~£? (space-heat electric) |
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| **Hot-water cost** | **£147** | **~£660 (raw electric — the bug)** |
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| Lighting cost | £64 | — |
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| RHI space / water demand | 1,186 / 1,909 kWh | space 1,039 / DHW 2,675 kWh |
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---
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## Fields to clear in Elmhurst (do NOT map)
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| Elmhurst page · field | Set to | Why absent |
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|---|---|---|
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| Property Description · 1st–4th Extension age band | (blank) | single building part "Main Dwelling", no extensions |
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| Property Description · Room-in-Roof | (blank) | ground-floor flat, no room-in-roof |
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| Dimensions · Room(s)-in-Roof area | (blank, not 0) | ditto |
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| Dimensions · 1st–4th Ext. sub-tabs | 0 / blank | one building part |
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| Roofs · roof area / U | none | "(other premises above)" — flat below another dwelling |
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| Openings · Doors | none | `door_count` 0 |
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| Openings · surplus window rows | delete beyond the 4 lodged | only 4 openings lodged |
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| Space Heating · Main Heating 2 | none | single main |
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| Space Heating · Secondary heating | none | `secondary_heating` None |
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| **Water Heating · in-dwelling cylinder / immersion** | **none** | `has_hot_water_cylinder` false; DHW is the community network, no local store |
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| Water Heating · Solar water heating / WWHRS / FGHRS | none | not lodged (`solar_water_heating` false; `instantaneous_wwhrs` is room-count metadata, not a device) |
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| New Technologies · PV / Wind / Hydro | none | none lodged |
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</content>
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{
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"uprn": 10094112770,
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"roofs": [
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{
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"description": "(other premises above)",
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"energy_efficiency_rating": 0,
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"environmental_efficiency_rating": 0
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}
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],
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"walls": [
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{
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"description": "Average thermal transmittance 0.19 W/m\u00b2K",
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"energy_efficiency_rating": 5,
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"environmental_efficiency_rating": 5
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}
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],
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"floors": [
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{
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"description": "Average thermal transmittance 0.17 W/m\u00b2K",
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"energy_efficiency_rating": 5,
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"environmental_efficiency_rating": 5
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}
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],
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"status": "entered",
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"tenure": 1,
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"windows": {
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"description": "High performance glazing",
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"energy_efficiency_rating": 5,
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"environmental_efficiency_rating": 5
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},
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"lighting": {
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"description": "Low energy lighting in all fixed outlets",
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"energy_efficiency_rating": 5,
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"environmental_efficiency_rating": 5
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},
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"postcode": "BB10 1BB",
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"data_type": 2,
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"hot_water": {
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"description": "Community scheme",
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"energy_efficiency_rating": 4,
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"environmental_efficiency_rating": 5
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},
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"post_town": "BURNLEY",
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"built_form": 3,
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"created_at": "2025-04-15 09:28:31",
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"living_area": 22.57,
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"orientation": 6,
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"region_code": 19,
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"report_type": 3,
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"sap_heating": {
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"water_heating_code": 950,
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"main_heating_details": [
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{
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"main_fuel_type": 39,
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"main_heating_code": 691,
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"emitter_temperature": "NA",
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"main_heating_number": 1,
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"main_heating_control": 2603,
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"main_heating_category": 10,
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"main_heating_fraction": 1,
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"main_heating_data_source": 3
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}
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],
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"has_hot_water_cylinder": "false",
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"has_fixed_air_conditioning": "false",
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"secondary_heating_category": 1,
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"sap_community_heating_systems": [
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{
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"community_heating_use": 2,
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"community_heat_sources": [
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{
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"fuel_type": 41,
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"heat_fraction": 0.9,
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"heat_efficiency": 324,
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"heat_source_type": 3
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},
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{
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"fuel_type": 41,
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"heat_fraction": 0.1,
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"heat_efficiency": 100,
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"heat_source_type": 2
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}
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],
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"charging_linked_to_heat_use": "true",
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"community_heating_distribution_type": 3,
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"is_community_heating_cylinder_in_dwelling": "false"
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}
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]
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},
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"sap_version": 9.92,
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"schema_type": "SAP-Schema-18.0.0",
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"uprn_source": "Energy Assessor",
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"country_code": "ENG",
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"main_heating": [
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{
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"description": "Room heaters, electric",
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"energy_efficiency_rating": 1,
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"environmental_efficiency_rating": 2
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}
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],
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"air_tightness": {
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"description": "Air permeability 3.2 m\u00b3/h.m\u00b2 (as tested)",
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"energy_efficiency_rating": 4,
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"environmental_efficiency_rating": 4
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},
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"dwelling_type": "Ground-floor flat",
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"language_code": 1,
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"property_type": 2,
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"address_line_1": "Apartment 4",
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"address_line_2": "Dovestone Gardens",
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"address_line_3": "Briercliffe Road",
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"assessment_date": "2025-04-15",
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"assessment_type": "SAP",
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"completion_date": "2025-04-15",
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"inspection_date": "2025-04-15",
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"sap_ventilation": {
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"psv_count": 0,
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"pressure_test": 1,
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"wet_rooms_count": 2,
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"air_permeability": 3.2,
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"open_flues_count": 0,
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"ventilation_type": 8,
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"extract_fans_count": 0,
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"open_fireplaces_count": 0,
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"sheltered_sides_count": 2,
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"flueless_gas_fires_count": 0,
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"mechanical_vent_duct_type": 2,
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"mechanical_vent_duct_insulation": 2,
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"mechanical_ventilation_data_source": 1,
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"mechanical_vent_system_index_number": 500167,
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"is_mechanical_vent_approved_installer_scheme": "false"
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},
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"design_water_use": 1,
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"sap_data_version": 9.92,
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"sap_flat_details": {
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"level": 1
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},
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"total_floor_area": 58,
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"transaction_type": 6,
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"conservatory_type": 1,
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"registration_date": "2025-04-15",
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"sap_energy_source": {
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"electricity_tariff": 1,
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"wind_turbines_count": 0,
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"wind_turbine_terrain_type": 2,
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"fixed_lighting_outlets_count": 10,
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"low_energy_fixed_lighting_outlets_count": 10,
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"low_energy_fixed_lighting_outlets_percentage": 100
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},
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"sap_opening_types": [
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{
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"name": "Windows SE SW",
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"type": 4,
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"u_value": 1.4,
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"data_source": 2,
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"frame_factor": 0.69,
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"glazing_type": 6,
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"solar_transmittance": 0.66
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},
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{
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"name": "Windows NE NW",
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"type": 4,
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"u_value": 1.4,
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"data_source": 2,
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"frame_factor": 0.69,
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"glazing_type": 6,
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"solar_transmittance": 0.66
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}
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],
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"secondary_heating": {
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"description": "None",
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"energy_efficiency_rating": 0,
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"environmental_efficiency_rating": 0
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},
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"lzc_energy_sources": [
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13
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],
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"sap_building_parts": [
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{
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"sap_walls": [
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{
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"name": "External Wall 1",
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"u_value": 0.19,
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"wall_type": 2,
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"description": "External Wall 1",
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"total_wall_area": 37.01,
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"is_curtain_walling": "false"
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},
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{
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"name": "Party Wall 0",
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"u_value": 0,
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"wall_type": 4,
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"total_wall_area": 21.02
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},
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{
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"name": "Party Wall 0",
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"u_value": 0,
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"wall_type": 4,
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"total_wall_area": 15.98
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}
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],
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"identifier": "Main Dwelling",
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"overshading": 2,
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"sap_openings": [
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{
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"name": "W1",
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"type": "Windows NE NW",
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"width": 0.91,
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"height": 2.24,
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"location": "External Wall 1",
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"orientation": 8
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},
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{
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"name": "W2",
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"type": "Windows NE NW",
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"width": 1.58,
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"height": 2.24,
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"location": "External Wall 1",
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"orientation": 8
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},
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{
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"name": "W3+W4",
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"type": "Windows NE NW",
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"width": 7.08,
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"height": 1,
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"location": "External Wall 1",
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"orientation": 2
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},
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{
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"name": "W5",
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"type": "Windows NE NW",
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"width": 0.91,
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"height": 2.24,
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"location": "External Wall 1",
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"orientation": 2
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}
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],
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"construction_year": 2022,
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"sap_thermal_bridges": {
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"thermal_bridges": [
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{
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"length": 6.56,
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"psi_value": 0.3,
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"psi_value_source": 2,
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"thermal_bridge_type": "E2"
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},
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{
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"length": 6.56,
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"psi_value": 0.04,
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"psi_value_source": 2,
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"thermal_bridge_type": "E3"
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},
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{
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"length": 22.4,
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"psi_value": 0.05,
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"psi_value_source": 2,
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"thermal_bridge_type": "E4"
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},
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{
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"length": 15.42,
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"psi_value": 0.114,
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"psi_value_source": 3,
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"thermal_bridge_type": "E5"
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},
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{
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"length": 15.42,
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"psi_value": 0.07,
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"psi_value_source": 2,
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"thermal_bridge_type": "E7"
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},
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{
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"length": 2.4,
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"psi_value": 0.09,
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"psi_value_source": 2,
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"thermal_bridge_type": "E16"
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},
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{
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"length": 4.8,
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"psi_value": 0.06,
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"psi_value_source": 2,
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"thermal_bridge_type": "E18"
|
||||
},
|
||||
{
|
||||
"length": 15.42,
|
||||
"psi_value": 0.16,
|
||||
"psi_value_source": 4,
|
||||
"thermal_bridge_type": "P1"
|
||||
},
|
||||
{
|
||||
"length": 15.42,
|
||||
"psi_value": 0,
|
||||
"psi_value_source": 4,
|
||||
"thermal_bridge_type": "P3"
|
||||
}
|
||||
],
|
||||
"thermal_bridge_code": 5
|
||||
},
|
||||
"building_part_number": 1,
|
||||
"sap_floor_dimensions": [
|
||||
{
|
||||
"storey": 0,
|
||||
"u_value": 0.17,
|
||||
"floor_type": 2,
|
||||
"description": "Heat Loss Floor 1",
|
||||
"storey_height": 2.4,
|
||||
"heat_loss_area": 58.11,
|
||||
"total_floor_area": 58.11
|
||||
}
|
||||
],
|
||||
"thermal_mass_parameter": 250
|
||||
}
|
||||
],
|
||||
"heating_cost_current": {
|
||||
"value": 374,
|
||||
"currency": "GBP"
|
||||
},
|
||||
"co2_emissions_current": 1.2,
|
||||
"energy_rating_average": 60,
|
||||
"energy_rating_current": 81,
|
||||
"lighting_cost_current": {
|
||||
"value": 64,
|
||||
"currency": "GBP"
|
||||
},
|
||||
"main_heating_controls": [
|
||||
{
|
||||
"description": "Programmer and appliance thermostats",
|
||||
"energy_efficiency_rating": 4,
|
||||
"environmental_efficiency_rating": 4
|
||||
}
|
||||
],
|
||||
"has_hot_water_cylinder": "false",
|
||||
"heating_cost_potential": {
|
||||
"value": 374,
|
||||
"currency": "GBP"
|
||||
},
|
||||
"hot_water_cost_current": {
|
||||
"value": 147,
|
||||
"currency": "GBP"
|
||||
},
|
||||
"co2_emissions_potential": 1.2,
|
||||
"energy_rating_potential": 81,
|
||||
"lighting_cost_potential": {
|
||||
"value": 64,
|
||||
"currency": "GBP"
|
||||
},
|
||||
"schema_version_original": "18.0.0",
|
||||
"hot_water_cost_potential": {
|
||||
"value": 147,
|
||||
"currency": "GBP"
|
||||
},
|
||||
"is_in_smoke_control_area": "unknown",
|
||||
"renewable_heat_incentive": {
|
||||
"rhi_new_dwelling": {
|
||||
"space_heating": 1186,
|
||||
"water_heating": 1909
|
||||
}
|
||||
},
|
||||
"seller_commission_report": "Y",
|
||||
"energy_consumption_current": 126,
|
||||
"has_fixed_air_conditioning": "false",
|
||||
"multiple_glazed_percentage": 100,
|
||||
"calculation_software_version": "4.14r19",
|
||||
"energy_consumption_potential": 126,
|
||||
"environmental_impact_current": 85,
|
||||
"current_energy_efficiency_band": "B",
|
||||
"environmental_impact_potential": 85,
|
||||
"has_heated_separate_conservatory": "false",
|
||||
"potential_energy_efficiency_band": "B",
|
||||
"co2_emissions_current_per_floor_area": 21
|
||||
}
|
||||
|
|
@ -1392,6 +1392,39 @@ _EXPECTATIONS: Final[tuple[RealCertExpectation, ...]] = (
|
|||
cert_num="8059-6020-9429-4133-0996",
|
||||
sap_score=72,
|
||||
),
|
||||
# UPRN 10094112770 → cert 9556-3047-3304-5355-1200. SAP-Schema-18.0.0 — a
|
||||
# FULL-SAP cert (2025 new-build GROUND-FLOOR FLAT, Dovestone Gardens,
|
||||
# Burnley, TFA 58 m²). Direct-electric room heaters for space heat + a
|
||||
# WATER-ONLY communal heat network for DHW (water_heating_code 950,
|
||||
# community_heating_use 2; network = 90% heat pump @ COP 3.24 + 10% boiler,
|
||||
# fuel 41). Lodged 81 (B); engine now produces 80.
|
||||
#
|
||||
# This cert IS the water-only community-DHW fix. The gov-API mapper dropped
|
||||
# `sap_community_heating_systems` for a non-community (category-10) main, so
|
||||
# the calculator priced communal heat-pump DHW as a DIRECT-ELECTRIC immersion
|
||||
# cylinder (2675 kWh @ 13.19p ≈ £353) and pinned SAP at 67 (D). Mapping the
|
||||
# network's fuel onto the DHW cascade (SAP Table 32 code 41 = heat from
|
||||
# electric heat pump @ 4.24 p/kWh, COP priced into the row) bills DHW at £113
|
||||
# and lifts SAP 67 → 80.
|
||||
#
|
||||
# Built in Elmhurst RdSAP10 on the lodged inputs (evidence saved:
|
||||
# elmhurst_summary.pdf / elmhurst_worksheet.pdf): Elmhurst worksheet SAP 74
|
||||
# (DHW 1839.64 kWh @ 4.24p = £78, heat pump 300%, distribution loss 1.5).
|
||||
# The +6 (80 vs 74) is the documented full-SAP→RdSAP methodology gap: the
|
||||
# engine uses the cert's MEASURED U-values (wall 0.19, floor 0.17) + MVHR
|
||||
# (PCDB 500167) → space heat 1039 kWh, where Elmhurst RdSAP uses age-band-M
|
||||
# proxies + a residual build AP50 (4.88 vs the cert's 3.2) → 1676 kWh. A
|
||||
# KNOWN residual pulls the OTHER way (~-2): the engine still adds an in-
|
||||
# dwelling cylinder storage loss (2675 vs the worksheet's cylinder-free 1839
|
||||
# kWh) though the network cylinder is not in the dwelling — a follow-up DHW-
|
||||
# energy refinement. PINNED TO THE OBSERVED 80 — mapping deliberately
|
||||
# untuned; the Elmhurst delta is the full-SAP→RdSAP residual, NOT a bug.
|
||||
RealCertExpectation(
|
||||
schema="SAP-Schema-18.0.0",
|
||||
sample="uprn_10094112770",
|
||||
cert_num="9556-3047-3304-5355-1200",
|
||||
sap_score=80,
|
||||
),
|
||||
)
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue