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sap score and elmhirst mapper optimsaiation
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Jun-te Kim
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25 changed files with 405 additions and 23 deletions
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@ -180,12 +180,23 @@ Table 32 unit costs, p/kWh (`domain/sap10_calculator/tables/table_32.py`):
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**`main_fuel_type` / `water_heating_fuel` 29 = off-peak (7-hour) electricity** →
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Elmhurst Electricity meter type = **Dual-rate / Economy 7 (7-hour)**, NOT Single.
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⚠️ **Known over-rating bug:** the engine prices **100% of off-peak space heating
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AND hot water at the 5.50p low rate** (`inputs.space_heating_fuel_cost_gbp_per_kwh`
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= 0.055), instead of the SAP **Table 12a high/low split** (a portion at the 15.29p
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high rate). This under-costs all-electric Economy-7 dwellings and inflates the SAP
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score. Always surface this in the output's "Known divergences". Canonical case:
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UPRN 10002468137 — lodged 55, engine 62.
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✅ **Economy-7 high/low split — FIXED (PR #1217).** The engine now applies the SAP
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**Table 12a Grid 1** (space) + **Table 13** (immersion DHW) high/low split rather
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than pricing 100% at the 5.50p low rate. Electric STORAGE heaters legitimately get
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a 0.00 SH high-rate fraction (100% low — spec value, not a bug); immersion HW takes
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the cylinder-volume/occupancy/single-dual Table 13 blend (applied in
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`cert_to_inputs._hot_water_fuel_cost_gbp_per_kwh` when volume + occupancy +
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single/dual are all resolved; absent any of them it still falls back to 100% low —
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a rarer edge). Verified: canonical UPRN 10002468137 engine 60.92 = Elmhurst 61 to
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the penny (its lodged 55 is the OLD SAP-2012 schema, not comparable); UPRN
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10022893721 engine 79 = lodged 79, Elmhurst (Dual meter) 81.
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⚠️ **When building in Elmhurst you MUST set the Economy-7 meter** (`main_fuel_type`
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/ `water_heating_fuel` 29 = off-peak 7-hour → Electricity meter type **Dual**, NOT
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Single). Elmhurst silently defaults to Single/Standard and prices at the 13.19p
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standard rate, collapsing the worksheet SAP ~13 points — which can masquerade as an
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engine "over-rating". The control is a hidden Meters sub-tab on the SpaceHeating
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page (`TabPanelMeters_RadioButtonListElectricityType`).
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## Water Heating
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@ -19,6 +19,74 @@ score the property would get unchanged. Elmhurst is the accredited ground truth;
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its Input Summary (parsed back to `EpcPropertyData`) exposes mapper holes, and its
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worksheet exposes calculator holes.
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## ⏩ Resume in a fresh context (autonomous run)
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If the user says "continue" / "next" / "keep going through the worklist", run this
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loop **continuously without asking between certs** — report only `eng X / elm Y`
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per cert and tick the worklist line as each is pinned. The build automation is
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fully working (see `scripts/hyde/elmhurst_lib.py` helpers + the `build_<uprn>.py`
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templates); most certs build unattended end-to-end.
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**State (2026-06-19):** pinned this campaign — SAP-17.1 cohort + RdSAP-17.1/18.0
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(older) plus: **16.1** `100021943298` (76/75), **19.1.0** `10096028301` (82/82),
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**16.3** `44012843` (79/78), **17.0** `10023444324` (80/80) + `10023444320`
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(81/82), **RdSAP-20.0.0** `10090844932` (78/77), **16.2** `100090182288` (69/71,
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semi house). Latest run (2026-06-19): **16.2** `100021985993` (74/72, end-terrace
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bungalow), **17.1** `10091568921` (82/80, full-SAP end-terrace house combi 17615)
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+ `10093718424` (81/80, semi sibling), **RdSAP-18.0** `10022893721` (79/81, first
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NON-BOILER cert — electric storage heaters + immersion; storage-heater automation
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now SOLVED incl. the Economy-7 Dual-meter step, see banked findings; engine 79 =
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lodged, NO bug), **RdSAP-21.0.1** `10023443426` (76/79, native schema, combi house;
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engine 76 = lodged EXACTLY; Elmhurst +3 = omitted-secondary build gap). Next `[ ]`:
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`10093412452` (SAP-17.1), then `10090343335` (17.0) / `10093115480` (17.1) /
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`68151071` (RdSAP-17.0). Skip `100020933699` (user said skip), `[⛔]` (NOT
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MAPPABLE), `[⚠]` (flagged engine bugs: MVHR / heat-pump fuel-39).
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**Per-UPRN recipe** (all commands `DISPLAY=:99`, cwd `scripts/hyde`; run
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`bash scripts/hyde/start_viewer.sh` once; creds in `.elmhurst-creds.json`; shared
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assessment GUID `B44A0DB4-4C08-4241-B818-86F060172105`):
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1. `PYTHONPATH=/workspaces/model python scripts/fetch_real_life_epc_sample.py <uprn>`
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then scope: dwelling_type/built_form, age band, walls/roof/floor descriptions,
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heating `main_heating_index_number`/category/`has_hot_water_cylinder`, window
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total area (`sum(sap_windows w*h)`), party_wall_length, lighting %, MEV/AP50.
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2. **Copy the closest `build_<uprn>.py` template** and adjust values:
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- combi flat → `build_100021943298.py`; regular-boiler+cylinder flat →
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`build_44012843.py`; full-SAP combi flat (MEV+AP50) → `build_10096028301.py`
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/ `build_10023444324.py` (+party wall) / `build_10023444320.py` (mid-floor);
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- combi house → `build_10090844932.py` (end-terrace, party wall) /
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`build_100090182288.py` (semi, no party wall).
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Adjust: property type/built-form, band (`_pick` by year, e.g. "1950"/"2012"/
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"2023"), two-floor dims + party wall, wall insulation, roof, floor, window m²,
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doors, lighting, boiler PCDB ref + search query, MEV/AP50 if present.
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3. Run pages: `for p in property_description [flats] dimensions walls roofs floors
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openings ventilation; do … build_<uprn>.py $p; done` (one Save&Close each,
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~1 min/page; flats only for Flat property type). Then a window-verify/fix
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snippet (re-add the combined window if the grid shows 0.00), then
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`build_<uprn>.py space_heating` and `water_heating`.
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4. Heating uses the `elmhurst_lib` helpers: `E.select_boiler(page, "<model>",
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"<pcdb_id>")` (look up id/type in `domain/elmhurst/pcdb_gas_oil_boiler_codes.csv`;
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the lodged `main_heating_index_number` IS the id); control
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`E.set_heating_dialog(page, "…ButtonMainHeatingControls", "^Boilers",
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"^Standard", "CBE Programmer, room thermostat and TRVs")` (=2106); water
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`E.set_heating_dialog(page, "…ButtonWaterHeatingCode", "From Space Heating",
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"From the primary heating system")`; combi → `E.clear_hot_water_cylinder(page)`.
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5. Download: edit `elmhurst_download.py` `SAMPLE_DIR` to the cert's
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`<schema>/uprn_<uprn>` dir; first confirm Recommendations is clean (parse
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`[id*=ContentPlaceHolder1] a` link text — Summary silently redirects to Address
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until zero errors); `python scripts/hyde/elmhurst_download.py` (retry once; the
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nav goes Address→Recommendations→Summary).
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6. `PYTHONPATH=/workspaces/model python scripts/compare_epc_paths.py <uprn>` →
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read **"gov-API inputs → SAP"** (engine) and **"Elmhurst's OWN engine
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(worksheet …)"** (Elmhurst ground truth). Target ≤0.5–1.
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7. **Pin** the engine value: add a `RealCertExpectation(schema, sample=uprn_<uprn>,
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cert_num, sap_score=<engine>)` in `tests/.../test_real_cert_sap_accuracy.py`;
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run `…::test_real_cert_sap_score`.
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8. Tick the worklist line `[x] … · eng X / elm Y (lodged Z) · PINNED …`. Next cert.
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See **Banked findings** below for the modal-dialog mechanics (all already encoded
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in the helpers). New schema not mappable → add a dedicated `from_*_schema_*`
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mapper first (per-schema convention) + guard with the RdSAP-21.0.1 corpus gauge.
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## The loop (one UPRN)
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1. **Pick** the first `[ ]` UPRN in [worklist.md](worklist.md).
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@ -93,6 +161,91 @@ Pattern: `with E.session() as (ctx,page): E.goto(...); E.set_text/set_select(...
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lines 17/18). This drove the first campaign mapper fix — see Banked findings.
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## Banked findings (fold new ones in here as the corpus grows)
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- **MAPPER GAP — cylinder insulation thickness dropped (RdSAP-17.0+):** the mapper
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carries `cylinder_size` + `cylinder_insulation_type` but NOT
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`cylinder_insulation_thickness` → `EpcPropertyData.sap_heating.cylinder_
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insulation_thickness_mm` stays None even when the cert lodges it (e.g. 50 mm).
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The engine then assumes a poorly-insulated cylinder → over-counts HW cylinder
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loss → under-rates. Confirmed uprn_68151071 (raw 50 mm → mapped None; engine HW
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3446 vs Elmhurst 2911 kWh; engine 68 vs lodged 70 / Elmhurst 71). FIX: map the
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thickness in the RdSAP per-schema mapper; check blast radius (any pinned cylinder
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cert may shift) + regress the RdSAP-21.0.1 corpus gauge. Leverage point — likely
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improves every cylinder-with-lodged-thickness cert. Flagged, not yet fixed.
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- **Party-wall type `_pick` gotcha:** matching `"filled"` ALSO matches "Cavity
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masonry **UN**filled" (CU, U≈0.5) — the wrong type for a cert whose party wall is
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U≈0. Match `"masonry filled"` to hit CF (Cavity masonry filled, U≈0). Affects
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cavity builds (10090844932 / 10091568921 / 10093718424 / 10093412452 used the
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loose `"filled"` and may have got CU in Elmhurst — only the Elmhurst cross-check,
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not the pinned engine value which is validated against lodged). Fixed for
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uprn_10093115480.
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- **Shared-assessment reset: storage/electric → boiler cert.** The shared
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assessment carries the PRIOR cert's heating system. Going storage→combi, the
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boiler search dialog won't open while a SAP-table `MainHeatingCode` (e.g. SEB) is
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set. Fix: JS-clear `MH1.TextBoxMainHeatingCode` to `''` + dispatch change, Save &
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Close, then `select_boiler` works. Also RESET the electricity meter on the Meters
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sub-tab (a prior off-peak cert leaves it Dual; gas certs want Single) and the
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SECONDARY heating (a prior cert's secondary persists even when the calc shows
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presence=No — set it explicitly or it pollutes the worksheet).
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- **Secondary heating must be built in Elmhurst when lodged.** Certs lodge a
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secondary (`sap_heating.secondary_heating_type`, e.g. 612 = mains-gas room heater
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@ Table 4a seasonal efficiency 0.20 — a low-eff decorative/old gas fire). The
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engine models it (fraction 0.1 from Table 11 ÷ the secondary efficiency → e.g.
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3065 kWh for code 612); omitting it in Elmhurst inflates the worksheet (uprn_
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10023443426: omitted → 79 vs engine/lodged 76). Build via Secondary present=Yes →
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`ButtonSecondaryHeatingCode` cascade (title "Select secondary heating"): fuel →
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sub-fuel → appliance → type, e.g. Gas → Mains gas → Room Heaters → RGx (pick the
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RGx whose efficiency matches the lodged code, ~0.20 = decorative/old gas fire).
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⚠ For a NATIVE RdSAP-21.0.1 cert, engine = lodged (exact, all components) is the
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authoritative validation — if the Elmhurst rebuild diverges, suspect an omitted
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lodged feature (secondary / meter), confirm via engine-on-Elmhurst-inputs ≈
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worksheet, and pin the engine = lodged value.
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- **Non-boiler (storage-heater) main heating — SOLVED** (uprn_10022893721, RdSAP-
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18.0 GF flat, electric storage heaters + immersion). The SpaceHeating page has NO
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inline system-type selector and a `ButtonMainHeatingCode` button only APPEARS
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once the bound PCDF boiler is cleared. Two-pass recipe (one Save & Close each):
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1. **Clear the leftover PCDB boiler**: set `MH1.TextBoxPCDFBoilerReference` to
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`"0"` via JS + dispatch `change`, then `save_close`. (It doesn't AutoPostBack;
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the Save commits it. After reload, boilerRef="0", the boiler fuel/flue fields
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vanish, and `MH1.ButtonMainHeatingCode` is now present.)
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2. **Select the SAP-table system** via `set_heating_dialog(..ButtonMainHeating
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Code, "^Electric","^Electric","Storage","SEB Modern slimline")` (title "Select
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heating code"; L1 Gas/Oil/Solid Fuel/Electric/Community/No heating; storage L4
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= SEA old large-volume / SEB modern slimline / SED fan / SEJ integrated / SEK
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high-heat-retention). **Match the cert's `sap_main_heating_code`**: 402 = SEB.
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Then the CONTROL via `set_heating_dialog(..ButtonMainHeatingControls,
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"Storage Radiator","CSA Manual charge control")` (= SAP 2401). Secondary No.
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Water: `set_heating_dialog(..ButtonWaterHeatingCode, "Water Heater","^Electric",
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"Immersion")` (→ code HEI) — then the immersion code REQUIRES a cylinder: CHECK
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`WH.CheckBoxHotWaterCylinder` (JS click+change, AutoPostBacks) or Recommendations
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errors "must have a Hot Water Cylinder"; set `WH.DropDownListCylinderSize`
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(size 2→Normal/110L, 3→Medium/160L, 4→Large/210L), `WH.DropDownListInsulated`
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(Foam/Jacket), `WH.DropDownListInsulationThickness`, and `WH.RadioButton
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ListImmersionHeater` (off-peak meter → Dual). See `build_10022893721.py` as the
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template. ⚠ **CRITICAL — set the electricity meter type.** All-electric off-peak
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certs MUST set the Economy-7 meter or Elmhurst silently defaults to Single /
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Standard and prices everything at the 13.19p standard rate (worksheet collapses
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~13 SAP). The control is a HIDDEN sub-tab on the SpaceHeating page:
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`E.click_tab(page,"TabContainer_TabPanelMeters")` then `E.set_select(page,
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"TabContainer_TabPanelMeters_RadioButtonListElectricityType","Dual")` (options
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Single/Dual/18 Hour/24 Hour/Unknown; cert `meter_type` 1→Dual=7-hour off-peak).
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Verify in Elmhurst summary §14.2 "Electricity meter type" / worksheet
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"Electricity Tariff" before trusting the worksheet SAP.
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- **Economy-7 off-peak pricing is CORRECT — do NOT "fix" it** (was a real bug, FIXED
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in PR #1217 via the Table 13 off-peak water-heating split + window-U fix). The
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engine applies SAP Table 12a Grid 1 (space) + Table 13 (immersion DHW) high/low
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splits properly: storage heaters' SH high-rate fraction is legitimately 0.00
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(100% low rate), immersion HW takes the volume/occupancy/single-dual blend. Proof:
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uprn_10002468137 (canonical) engine 60.92 = Elmhurst 61 to the penny;
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uprn_10022893721 engine 79 = lodged 79, Elmhurst (Dual meter) 81. ⚠ If you see a
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big engine-over-Elmhurst gap on an all-electric off-peak cert, SUSPECT THE BUILD
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(Elmhurst meter left on Single — see meter step above), not the calculator. The
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`reference/mapping.md` "known over-rating bug (engine 62)" note is STALE (pre-PR
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#1217). `cert_to_inputs.py` `_hot_water_fuel_cost_gbp_per_kwh` applies the immersion
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Table 13 blend when cylinder volume + occupancy resolve; when `immersion_heating_
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type` is UNLODGED on an off-peak meter it now defaults to DUAL per RdSAP §10.5
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(was a 100%-low-rate fallback that under-costs — fixed, +regression test
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`test_off_peak_immersion_unlodged_type_defaults_to_dual_table13_blend`). Only an
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unresolvable cylinder volume / occupancy still falls back to 100% low.
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- **Air-permeability AP50 fix** (uprn_10093116528, the first campaign cert): the
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full-SAP mapper was routing the lodged q50 to the engine's AP4/Pulse formula
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(`0.263×AP4^0.924`) instead of the AP50 `/20` path — a big infiltration
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@ -134,6 +287,15 @@ Pattern: `with E.session() as (ctx,page): E.goto(...); E.set_text/set_select(...
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cylinder()`, then set water method "From Space Heating → primary" via
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`set_heating_dialog(..ButtonWaterHeatingCode, 'From Space Heating', 'From the
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primary heating system')`.
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- **Reduced-field (16.x) semi/terraced party wall.** 16.x lodges no
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`party_wall_length`, so the engine models NO party wall (defaults 0). But
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Elmhurst REJECTS a semi/terraced with a zero party wall ("At least one building
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part must have a party wall length of non zero"). Enter the geometry-derived
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length (solve `2w+d=heat_loss_perimeter`, `w*d=floor_area`; party wall = the
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joined side `d`) on every floor + a filled-cavity party-wall type (CF), and
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EXPECT engine to over-read Elmhurst by ~1–2 SAP (engine's no-party-wall vs
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Elmhurst's forced one). That delta is the documented reduced-field gap, not a
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bug — confirm via engine-on-Elmhurst-inputs ≈ worksheet. Pin the engine value.
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- **Main-heating control must match the boiler's system type.** Heat-pump leftover
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control (e.g. CHJ/2210, ctrl-group-2) is invalid for a gas boiler (ctrl-group-1)
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and blocks the report. For a boiler programmer+room-stat+TRVs (SAP 2106):
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@ -4,7 +4,8 @@ Process **one at a time**, top to bottom (see [SKILL.md](SKILL.md)). After each
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UPRN, tick it and annotate: `— <schema> · eng <X> / elm <Y> · <note>`.
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**Legend:** `[ ]` todo · `[x]` pinned (≤0.5) · `🔧` mapper extended · `⚠` xfail
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(engine bug) · `⛔` blocked.
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(engine bug) · `⛔` blocked · `[🔍]` flagged — engine vs Elmhurst-worksheet gap too
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large, or a new/complex build pattern needed; NEEDS INVESTIGATION.
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**Worked reference (not in the 100):** `uprn_10092973954` (SAP-Schema-17.1,
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2020 new-build flat) — full loop proven: eng 77 / elm 78, engine-on-Elmhurst-
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@ -60,19 +61,19 @@ Skip the 🚩 MVHR / 🚩 heat-pump-fuel and ⛔ sparse certs.
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- [⚠] 10094601287 — SAP-18.0.0 · eng 80 / lodged 84 · 🚩 MVHR idx 500230 not credited (flagged)
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- [x] 10090844932 — RdSAP-20.0.0 (end-terrace HOUSE 2-storey, band L, combi PCDB 10327, party wall 4.93, 250mm loft) · eng 78 / elm 77 (lodged 78) · PINNED engine 78. Built in Elmhurst (House, boiler 10327 via search, control CBE/2106, water from primary, party wall 4.93 filled). Within ~1 (78.13 vs 77); engine-on-Elmhurst-inputs 77.24 ≈ 77 → faithful.
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- [⛔] 10090844948 — SAP-16.3 · NOT MAPPABLE (ValueError: RdSapSchema17_1: missing required field )
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- [ ] 100090182288 — SAP-16.2 · eng 71 / lodged 71
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- [x] 100090182288 — SAP-16.2 (semi-detached HOUSE 2-storey, band D, filled cavity, combi PCDB 10327, double glazed) · eng 71 / elm 69 (lodged 71) · PINNED engine 71. Built in Elmhurst (semi, boiler 10327, control CBE/2106, water from primary, party wall 4.28 filled — Elmhurst requires non-zero for a semi). +2 vs Elmhurst = documented 16.2 reduced-field party-wall gap (gov-API lodges no party_wall_length → engine models none); engine-on-Elmhurst-inputs 69.35 ≈ worksheet 69 → calculator faithful.
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- [⚠] 10093114053 — SAP-17.0 · eng 93 / lodged 79 · 🚩 heat-pump fuel-39 (flagged)
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- [ ] 10091568921 — SAP-17.1 · eng 82 / lodged 85
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- [ ] 10093718424 — SAP-17.1 · eng 81 / lodged 84
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- [ ] 10022893721 — RdSAP-18.0 · eng 79 / lodged 79
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- [ ] 10023443426 — RdSAP-21.0.1 · eng 76 / lodged 76
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- [ ] 10093412452 — SAP-17.1 · eng 81 / lodged 84
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- [x] 10091568921 — SAP-17.1 (full-SAP END-TERRACE HOUSE 2-storey, band L 2018, combi PCDB 17615 Potterton Promax Ultra, party wall 40.56m², natural vent + 3 extract fans, AP50 4.45, 20 LED, measured U 0.18/0.10/0.15) · eng 82 / elm 80 (lodged 85) · PINNED engine 82. Built in Elmhurst (end-terrace house, boiler 17615, CBE/2106, water from primary, party wall 8.45 filled, AP50 Blower Door 4.45+cert). +2 = documented full-SAP→RdSAP residual (measured U beats band-L defaults); engine-on-Elmhurst-inputs 80.16 ≈ worksheet 80 → faithful. has_hot_water_cylinder lodged true but combi PCDB + no cylinder detail → built combi. No mapper change.
|
||||
- [x] 10093718424 — SAP-17.1 (full-SAP SEMI-DETACHED HOUSE 2-storey, band L, combi PCDB 17615, party wall 40.89m², natural vent + 3 extract fans, AP50 4.18, 20 LED, measured U 0.25/0.13/0.16; sibling of 10091568921) · eng 81 / elm 80 (lodged 84) · PINNED engine 81. +1 = documented full-SAP→RdSAP residual; engine-on-Elmhurst-inputs 80.12 ≈ worksheet 80 → faithful. Built combi (cylinder lodged true but combi PCDB). No mapper change.
|
||||
- [x] 10022893721 — RdSAP-18.0 (GF FLAT, band I, cavity insulated, ELECTRIC STORAGE HEATERS SAP 402 SEB Modern slimline + manual charge CSA/2401, immersion off-peak dual + cylinder Normal/110L foam 50mm, party wall 21.48) · eng 79 / elm 81 (lodged 79) · PINNED engine 79 = lodged. Built in Elmhurst (storage SEB, CSA control, immersion dual + cylinder, **Dual electricity meter / Economy 7**). engine -2 vs Elmhurst, within tolerance; engine-on-Elmhurst-inputs 78.76 ≈ 79 → faithful. Economy-7 off-peak pricing is CORRECT (Table 12a/13, fixed PR #1217) — NOT a bug. ⚠ Earlier mis-build left Elmhurst meter on Single/Standard → bogus worksheet 66; fixed by setting Dual meter on the Meters sub-tab. 🔧 First non-boiler cert — SOLVED storage-heater automation (see banked findings: clear PCDB boiler → ButtonMainHeatingCode Electric→Electric→Storage→SEB; set Dual meter). build_10022893721.py complete.
|
||||
- [x] 10023443426 — RdSAP-21.0.1 (END-TERRACE HOUSE 2-storey, band L, cavity insulated, combi PCDB 17045 Ideal Logic ES35, 300mm loft, party wall 9.2 lodged, 11 dbl-glazed windows ~10.3m², 9 LED, mains-gas room-heater SECONDARY code 612 eff 0.20) · eng 76 / elm 79 (lodged 76) · PINNED engine 76 = lodged EXACTLY (native RdSAP-21.0.1 schema; reproduces every component: space 6129/main 6247/HW 2752/CO2 2232). Elmhurst +3 is a BUILD gap — my build omitted the lodged secondary gas fire (engine models it 3065 kWh = 0.1÷0.20); engine-on-Elmhurst-inputs 79.29 ≈ worksheet 79 → calculator faithful. NB: shared-assessment storage→combi reset needed (clear leftover MainHeatingCode) + meter reset to Single. build_10023443426.py.
|
||||
- [x] 10093412452 — SAP-17.1 (full-SAP END-TERRACE HOUSE 2-storey, band L, combi PCDB 17615, party wall 41.01m², natural vent + 3 extract fans, AP50 4.62, 20 LED, measured U 0.25/0.13/0.16; sibling of 10093718424/10091568921) · eng 81 / elm 80 (lodged 84) · PINNED engine 81. +1 = documented full-SAP→RdSAP residual; engine-on-Elmhurst-inputs 79.91 ≈ worksheet 80 → faithful. Built combi (cylinder lodged true but combi PCDB). No mapper change.
|
||||
- [⛔] 10014314798 — SAP-16.2 · NOT MAPPABLE (ValueError: RdSapSchema17_1: missing required field )
|
||||
- [⚠] 10094601294 — SAP-18.0.0 · eng 81 / lodged 84 · 🚩 MVHR idx 500230 not credited (flagged)
|
||||
- [ ] 10090343335 — SAP-17.0 · eng 86 / lodged 88
|
||||
- [ ] 10093115480 — SAP-17.1 · eng 81 / lodged 81
|
||||
- [ ] 68151071 — RdSAP-17.0 · eng 68 / lodged 70
|
||||
- [ ] 100021985993 — SAP-16.2 · eng 74 / lodged 70
|
||||
- [🔍] 10090343335 — SAP-17.0 (full-SAP SEMI-DETACHED HOUSE, 3-storey incl. ROOM-IN-ROOF top floor h1.95, combi PCDB 16841 Vaillant ecoTEC plus 824, party wall 48.51m², 10 windows 18.46m² + 1 ROOF WINDOW type-12 2.31m², 3 doors, AP50 3.98, 10 LED, measured U walls 0.18/roof 0.15/floor 0.13, TFA 122) · eng 86 / lodged 88 · 🔍 FLAGGED — NEEDS NEW BUILD PATTERN: room-in-roof + roof-window not covered by templates (Elmhurst DIM panel only exposes 2 floors; room-in-roof entered via RoomInRoofMain age-band + separate RiR dimensions TBD; roof window type-12 entry TBD). Elmhurst build + worksheet comparison pending. Skipped in autonomous sweep to keep momentum; revisit with a dedicated room-in-roof build.
|
||||
- [x] 10093115480 — SAP-17.1 (full-SAP END-TERRACE BUNGALOW single-storey, band L 2016, combi PCDB 16841, party wall 10.99m² CF filled, natural vent + 2 fans, AP50 3.85, 9 LED, measured U 0.19/0.11/0.12, TFA 56) · eng 81 / elm 78 (lodged 81) · PINNED engine 81 = lodged EXACT. +3 = documented full-SAP→RdSAP residual (measured U beats band-L defaults); engine-on-Elmhurst-inputs 78.29 ≈ worksheet 78 → faithful. Built combi. No mapper change.
|
||||
- [🔍] 68151071 — RdSAP-17.0 (semi-detached BUNGALOW single-storey, band H 1991-1995, cavity insulated, REGULAR boiler PCDB 17550 Worcester Greenstar 18Ri + cylinder size2/foam/50mm, pitched 200mm loft, suspended uninsulated floor, party wall 9.48 lodged, TFA 50) · eng 68 / elm 71 (lodged 70) · 🔍 FLAGGED — MAPPER GAP (cylinder insulation thickness dropped). engine -3 vs Elmhurst, -2 vs lodged; engine HW 3446 kWh vs Elmhurst 2911. ROOT CAUSE confirmed: raw cert lodges sap_heating.cylinder_insulation_thickness=50 but the RdSAP-17.0 mapper maps cylinder_size + cylinder_insulation_type only, leaving EpcPropertyData.sap_heating.cylinder_insulation_thickness_mm=None → engine assumes a poorly-insulated cylinder → over-counts HW cylinder loss → under-rates. FIX: carry cylinder_insulation_thickness → cylinder_insulation_thickness_mm in the RdSAP mapper (check blast radius across schemas + regression). engine-on-Elmhurst-inputs 71.34 ≈ worksheet 71 → calculator faithful (gap is purely the dropped input). build_68151071.py + evidence saved.
|
||||
- [x] 100021985993 — SAP-16.2 (END-TERRACE BUNGALOW single-storey, band C, solid-brick internal insulation, combi PCDB 10328, double glazed, 100mm loft, suspended uninsulated floor) · eng 74 / elm 72 (lodged 70) · PINNED engine 74. Built in Elmhurst (end-terrace, boiler 10328, control CBE/2106, water from primary, party wall 6.89 solid masonry — Elmhurst requires non-zero for an end-terrace). +2 vs Elmhurst = documented 16.2 reduced-field party-wall gap (gov-API lodges no party_wall_length → engine models none; worksheet's only extra element is party wall 16.19m²×U0.25=4.05 W/K ≈ 2 SAP). engine-on-Elmhurst-PDF-inputs 67 is PDF-parser noise (HW over-parsed), not a calc bug.
|
||||
- [ ] 100020665611 — RdSAP-20.0.0 · eng 36 / lodged 37
|
||||
- [⚠] 10093388044 — SAP-17.1 · eng 87 / lodged 93 · 🚩 heat-pump fuel-39 (flagged)
|
||||
- [ ] 10090944225 — SAP-17.0 · eng 81 / lodged 82
|
||||
|
|
|
|||
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|
|
@ -2579,9 +2579,13 @@ def _hot_water_fuel_cost_gbp_per_kwh(
|
|||
billed at the high rate, the remainder at the low rate. Without it
|
||||
the immersion HW billed 100% at the off-peak low rate, under-costing
|
||||
the dwelling and over-rating it (median +0.98 SAP across the off-peak
|
||||
WHC-903 API cohort). Needs `cylinder_volume_l` + `occupancy_n` +
|
||||
`immersion_single`; absent any of them (no cylinder / volume not
|
||||
resolvable) it falls back to the 100%-low-rate scalar.
|
||||
WHC-903 API cohort). Needs `cylinder_volume_l` + `occupancy_n`; when
|
||||
`immersion_single` is unlodged (None) this branch is on an off-peak /
|
||||
dual meter, so per RdSAP 10 §10.5 (PDF p.54) the immersion is assumed
|
||||
DUAL rather than falling back to the 100%-low-rate scalar (Elmhurst
|
||||
applies the dual blend, e.g. uprn_10022893721 high-rate fraction
|
||||
0.1386). Only an unresolvable cylinder volume / occupancy now falls
|
||||
back to the 100%-low-rate scalar.
|
||||
|
||||
`inherit_main_for_community_heating`: per S0380.173, when WHC
|
||||
∈ {901, 902, 914} AND main is a heat network, ignore the cert-
|
||||
|
|
@ -2610,13 +2614,22 @@ def _hot_water_fuel_cost_gbp_per_kwh(
|
|||
water_heating_code == _WHC_ELECTRIC_IMMERSION
|
||||
and cylinder_volume_l is not None
|
||||
and occupancy_n is not None
|
||||
and immersion_single is not None
|
||||
):
|
||||
# RdSAP 10 §10.5 (PDF p.54): an immersion is assumed DUAL on a dual /
|
||||
# off-peak meter. This branch is only reached on an off-peak tariff
|
||||
# (tariff is not STANDARD ⇒ the meter is dual / Economy-7), so when the
|
||||
# cert does not lodge `immersion_heating_type` default to dual rather
|
||||
# than dropping to the 100%-low-rate fallback. The fallback under-costs
|
||||
# the DHW and over-rates the dwelling, whereas Elmhurst applies the
|
||||
# Table 13 dual blend (e.g. uprn_10022893721 high-rate fraction 0.1386).
|
||||
effective_single = (
|
||||
immersion_single if immersion_single is not None else False
|
||||
)
|
||||
high_rate, low_rate = _tariff_high_low_rates_p_per_kwh(tariff)
|
||||
high_frac = electric_dhw_high_rate_fraction(
|
||||
cylinder_volume_l=cylinder_volume_l,
|
||||
occupancy_n=occupancy_n,
|
||||
single_immersion=immersion_single,
|
||||
single_immersion=effective_single,
|
||||
tariff=tariff,
|
||||
)
|
||||
blended = high_frac * high_rate + (1.0 - high_frac) * low_rate
|
||||
|
|
|
|||
|
|
@ -28,7 +28,7 @@ SESSION_DIR = HERE / ".elmhurst-session"
|
|||
SAMPLE_DIR = (
|
||||
HERE.parent.parent
|
||||
/ "backend/epc_api/json_samples/real_life_examples"
|
||||
/ "RdSAP-Schema-20.0.0/uprn_10090844932"
|
||||
/ "RdSAP-Schema-17.0/uprn_68151071"
|
||||
)
|
||||
|
||||
ASSESSMENT_GUID = "B44A0DB4-4C08-4241-B818-86F060172105"
|
||||
|
|
|
|||
|
|
@ -682,6 +682,55 @@ def test_integrated_storage_heater_408_bills_table_12a_grid1_high_rate_fraction(
|
|||
assert abs(inputs.space_heating_fuel_cost_gbp_per_kwh - 0.07458) <= 1e-9
|
||||
|
||||
|
||||
def test_off_peak_immersion_unlodged_type_defaults_to_dual_table13_blend() -> None:
|
||||
# Arrange — electric immersion DHW (WHC 903) on a Dual / Economy-7 (7-hour)
|
||||
# meter with a cylinder present (Normal / 110 L), but the cert does NOT lodge
|
||||
# `immersion_heating_type`. RdSAP 10 §10.5 (PDF p.54) assumes a DUAL immersion
|
||||
# on a dual / off-peak meter, so the hot-water scalar rate must be the SAP
|
||||
# 10.2 Table 13 DUAL high/low blend (a small high-rate fraction at 15.29 p +
|
||||
# the remainder at 5.50 p), NOT the 100%-low-rate (5.50 p) fallback that an
|
||||
# unlodged type previously triggered. The fallback under-costs the DHW and
|
||||
# over-rates the dwelling — cf. uprn_10022893721, whose Elmhurst worksheet
|
||||
# bills the immersion at a 0.1386 high-rate fraction, not 100% low.
|
||||
from dataclasses import replace
|
||||
|
||||
main = MainHeatingDetail(
|
||||
has_fghrs=False,
|
||||
main_fuel_type=29, # electricity
|
||||
heat_emitter_type=0,
|
||||
emitter_temperature=1,
|
||||
main_heating_control=2401,
|
||||
main_heating_category=7, # electric storage heaters
|
||||
sap_main_heating_code=401,
|
||||
)
|
||||
base = make_minimal_sap10_epc(
|
||||
total_floor_area_m2=_TYPICAL_TFA_M2,
|
||||
habitable_rooms_count=4,
|
||||
country_code="ENG",
|
||||
has_hot_water_cylinder=True,
|
||||
sap_building_parts=[make_building_part(construction_age_band="E")],
|
||||
sap_heating=make_sap_heating(
|
||||
main_heating_details=[main],
|
||||
water_heating_code=903, # electric immersion
|
||||
water_heating_fuel=29, # off-peak electricity
|
||||
cylinder_size=2, # Normal / 110 L
|
||||
immersion_heating_type=None, # UNLODGED -> assume dual on off-peak
|
||||
),
|
||||
)
|
||||
epc = replace(
|
||||
base,
|
||||
sap_energy_source=replace(base.sap_energy_source, meter_type="1"), # Dual
|
||||
)
|
||||
|
||||
# Act
|
||||
inputs = cert_to_inputs(epc)
|
||||
|
||||
# Assert — the Table 13 DUAL blend applied, not the 100%-low-rate fallback.
|
||||
rate = inputs.hot_water_fuel_cost_gbp_per_kwh
|
||||
assert rate > 0.0550 + 1e-6 # NOT the 100%-low-rate bug value (5.50 p/kWh)
|
||||
assert rate < 0.0900 # a small DUAL high-rate fraction, not single (~11 p)
|
||||
|
||||
|
||||
def test_non_integrated_storage_heater_bills_100_percent_low_rate() -> None:
|
||||
# Arrange — same off-peak storage cert but SAP code 401 ("other storage
|
||||
# heaters"): Table 12a Grid 1 gives a 0.00 high-rate fraction → the heat
|
||||
|
|
|
|||
|
|
@ -364,6 +364,152 @@ _EXPECTATIONS: Final[tuple[RealCertExpectation, ...]] = (
|
|||
cert_num="0646-3008-6208-0619-6204",
|
||||
sap_score=78,
|
||||
),
|
||||
# UPRN 100090182288 → cert 0068-1092-7237-0157-9954. SAP-Schema-16.2 —
|
||||
# reduced-field SEMI-DETACHED HOUSE, 2-storey, band D (1950-1966), filled
|
||||
# cavity, pitched roof 250 mm, solid uninsulated floor, mains-gas COMBI (PCDB
|
||||
# 10327 Vaillant Ecotec Plus 831), double glazed, TFA 73.4 m². Lodged 71;
|
||||
# engine 71. Built in Elmhurst RdSAP10 (evidence saved): Elmhurst worksheet 69.
|
||||
# The +2 (engine 71 vs Elmhurst 69) is the documented 16.2 reduced-field
|
||||
# PARTY-WALL gap: gov-API 16.2 lodges no party_wall_length → the engine models
|
||||
# NO party wall, but Elmhurst requires one for a semi (entered the geometry-
|
||||
# derived 4.28 m, filled cavity). Calculator confirmed faithful: engine on
|
||||
# Elmhurst's own parsed inputs (which include the party wall) = 69.35 ≈ worksheet
|
||||
# 69. PINNED to the observed 71 (= lodged) — mapping untuned; the Elmhurst delta
|
||||
# is the reduced-field missing-party-wall-data gap, not a calculator bug.
|
||||
RealCertExpectation(
|
||||
schema="SAP-Schema-16.2",
|
||||
sample="uprn_100090182288",
|
||||
cert_num="0068-1092-7237-0157-9954",
|
||||
sap_score=71,
|
||||
),
|
||||
# UPRN 100021985993 → cert 9658-2087-7277-0667-1910. SAP-Schema-16.2 —
|
||||
# reduced-field END-TERRACE BUNGALOW, single-storey, band C (1930-1949),
|
||||
# solid-brick internal insulation, pitched roof 100 mm loft, suspended
|
||||
# uninsulated floor, mains-gas COMBI (PCDB 10328 Vaillant Ecotec Pro 28),
|
||||
# double glazed, TFA 76.54 m². Lodged 70; engine 74. Built in Elmhurst RdSAP10
|
||||
# (evidence saved): Elmhurst worksheet 72. The +2 (engine 74 vs Elmhurst 72) is
|
||||
# the documented 16.2 reduced-field PARTY-WALL gap: gov-API 16.2 lodges no
|
||||
# party_wall_length → the engine models NO party wall, but Elmhurst requires one
|
||||
# for an end-terrace (entered the geometry-derived 6.89 m, solid masonry; the
|
||||
# worksheet's only extra heat-loss element is the party wall at 16.19 m² × U0.25
|
||||
# = 4.05 W/K ≈ the 2-SAP gap). Calculator faithful: engine-on-gov-API 74 minus
|
||||
# that omitted party-wall heat loss ≈ 72 = worksheet. (Engine on Elmhurst's
|
||||
# PDF-parsed inputs = 67 here — lower than the worksheet — is PDF-parser noise:
|
||||
# hot water over-parsed to 2998 kWh/£684; not a calculator divergence.) PINNED
|
||||
# to the observed 74 — mapping untuned; the Elmhurst delta is the reduced-field
|
||||
# missing-party-wall-data gap, not a calculator bug.
|
||||
RealCertExpectation(
|
||||
schema="SAP-Schema-16.2",
|
||||
sample="uprn_100021985993",
|
||||
cert_num="9658-2087-7277-0667-1910",
|
||||
sap_score=74,
|
||||
),
|
||||
# UPRN 10091568921 → cert 8806-5635-1239-5807-8283. SAP-Schema-17.1 — full-SAP
|
||||
# END-TERRACE HOUSE, 2-storey, 2018 (band L), measured U walls 0.18 / roof 0.10
|
||||
# / floor 0.15, mains-gas COMBI (PCDB 17615 Potterton Promax Ultra Combi 28,
|
||||
# 88.5%), double glazed, party wall 40.56 m², natural vent + 3 extract fans,
|
||||
# AP50 4.45 (tested), 20 LED outlets, TFA 78.7 m². has_hot_water_cylinder lodged
|
||||
# true but cylinder detail all None + PCDB combi → built as combi (water from
|
||||
# primary). Lodged 85; engine 82. Built in Elmhurst RdSAP10 (evidence saved):
|
||||
# worksheet 80. The +2 (engine 82 vs Elmhurst 80) is the documented full-SAP→
|
||||
# RdSAP residual (cert's measured U-values beat RdSAP band-L age defaults).
|
||||
# Calculator confirmed faithful: engine on Elmhurst's own parsed inputs = 80.16
|
||||
# ≈ worksheet 80. PINNED to the observed 82 — mapping untuned. (Control: cert
|
||||
# 2110 time+temp zone vs Elmhurst CBE 2106; sub-0.5 SAP, in the noise.)
|
||||
RealCertExpectation(
|
||||
schema="SAP-Schema-17.1",
|
||||
sample="uprn_10091568921",
|
||||
cert_num="8806-5635-1239-5807-8283",
|
||||
sap_score=82,
|
||||
),
|
||||
# UPRN 10093718424 → cert 0369-3892-7678-2690-7475. SAP-Schema-17.1 — full-SAP
|
||||
# SEMI-DETACHED HOUSE, 2-storey, band L, measured U walls 0.25 / roof 0.13 /
|
||||
# floor 0.16, mains-gas COMBI (PCDB 17615 Potterton Promax Ultra Combi 28),
|
||||
# double glazed, party wall 40.89 m², natural vent + 3 extract fans, AP50 4.18
|
||||
# (tested), 20 LED outlets, TFA 79.9 m². Sibling of uprn_10091568921 (same
|
||||
# development/boiler); built combi (cylinder lodged true but combi PCDB).
|
||||
# Lodged 84; engine 81. Built in Elmhurst RdSAP10 (evidence saved): worksheet
|
||||
# 80. The +1 (engine 81 vs Elmhurst 80) is the documented full-SAP→RdSAP
|
||||
# residual. Calculator faithful: engine on Elmhurst's own parsed inputs = 80.12
|
||||
# ≈ worksheet 80. PINNED to the observed 81 — mapping untuned.
|
||||
RealCertExpectation(
|
||||
schema="SAP-Schema-17.1",
|
||||
sample="uprn_10093718424",
|
||||
cert_num="0369-3892-7678-2690-7475",
|
||||
sap_score=81,
|
||||
),
|
||||
# UPRN 10022893721 → cert 8078-7422-5930-5662-8922. RdSAP-Schema-18.0 — GROUND-
|
||||
# FLOOR FLAT, band I (1996-2002), cavity insulated, ELECTRIC STORAGE HEATERS
|
||||
# (SAP code 402 = SEB Modern slimline, manual charge control 2401) + electric
|
||||
# immersion off-peak (dual-rate) hot water with cylinder (Normal/110 L, foam
|
||||
# 50 mm), party wall 21.48 m, TFA 54.29. First non-boiler corpus cert. Lodged
|
||||
# 79; engine 79. Built in Elmhurst RdSAP10 (evidence saved): worksheet 81 —
|
||||
# engine -2, within tolerance; engine on Elmhurst's own parsed inputs = 78.76 ≈
|
||||
# engine 79 → calculator faithful. The Economy-7 off-peak pricing is CORRECT
|
||||
# (Table 12a/13 split, fixed in PR #1217): storage SH high-rate fraction 0.00 →
|
||||
# 100% low rate is the spec value, and immersion HW takes the Table 13 blend.
|
||||
# (An earlier build mistakenly left Elmhurst's meter on Single/Standard, pricing
|
||||
# at 13.19p → bogus worksheet 66; corrected by setting the Dual meter. NOT an
|
||||
# engine bug.) PINNED to the observed engine 79 = lodged.
|
||||
RealCertExpectation(
|
||||
schema="RdSAP-Schema-18.0",
|
||||
sample="uprn_10022893721",
|
||||
cert_num="8078-7422-5930-5662-8922",
|
||||
sap_score=79,
|
||||
),
|
||||
# UPRN 10023443426 → cert 4106-3336-4002-1402-2202. RdSAP-Schema-21.0.1 (the
|
||||
# engine's NATIVE schema) — END-TERRACE HOUSE, 2-storey, band L, cavity
|
||||
# insulated, mains-gas COMBI (PCDB 17045 Ideal Logic Combi ES35), 300 mm loft,
|
||||
# solid insulated floor, party wall 9.2 m (lodged), 11 double-glazed windows
|
||||
# (~10.3 m²), 9 LED, mains-gas room-heater SECONDARY (SAP code 612, seasonal
|
||||
# efficiency 0.20 per Table 4a — a low-efficiency decorative/old gas fire),
|
||||
# TFA 98. Engine 76 = lodged 76 EXACTLY (and reproduces every component: space
|
||||
# 6129, main fuel 6247, HW 2752, CO2 2232 kWh/kg) — the authoritative validation
|
||||
# for a native-schema cert. Built in Elmhurst RdSAP10 (evidence saved):
|
||||
# worksheet 79. The +3 is a BUILD gap, not a calculator error — my Elmhurst
|
||||
# build omitted the lodged secondary gas fire (engine models it at 3065 kWh =
|
||||
# 0.1 fraction ÷ 0.20 eff; Elmhurst secondary 0). engine on Elmhurst's own
|
||||
# parsed inputs (also no secondary) = 79.29 ≈ worksheet 79 → calculator faithful
|
||||
# to its inputs. PINNED to the observed engine 76 = lodged; mapping untuned.
|
||||
RealCertExpectation(
|
||||
schema="RdSAP-Schema-21.0.1",
|
||||
sample="uprn_10023443426",
|
||||
cert_num="4106-3336-4002-1402-2202",
|
||||
sap_score=76,
|
||||
),
|
||||
# UPRN 10093412452 → cert 8306-7575-5832-6507-9803. SAP-Schema-17.1 — full-SAP
|
||||
# END-TERRACE HOUSE, 2-storey, band L, measured U walls 0.25 / roof 0.13 /
|
||||
# floor 0.16, mains-gas COMBI (PCDB 17615 Potterton Promax Ultra Combi 28),
|
||||
# double glazed (~12.3 m²), party wall 41.01 m², natural vent + 3 extract fans,
|
||||
# AP50 4.62, 20 LED, no secondary, TFA 79.8 m². Same Emsworth development as the
|
||||
# 10091568921 / 10093718424 siblings (cylinder lodged true but combi PCDB →
|
||||
# built combi). Lodged 84; engine 81. Built in Elmhurst RdSAP10 (evidence
|
||||
# saved): worksheet 80. The +1 (engine 81 vs Elmhurst 80) is the documented
|
||||
# full-SAP→RdSAP residual; engine on Elmhurst's own parsed inputs = 79.91 ≈
|
||||
# worksheet 80 → calculator faithful. PINNED to the observed 81 — mapping
|
||||
# untuned.
|
||||
RealCertExpectation(
|
||||
schema="SAP-Schema-17.1",
|
||||
sample="uprn_10093412452",
|
||||
cert_num="8306-7575-5832-6507-9803",
|
||||
sap_score=81,
|
||||
),
|
||||
# UPRN 10093115480 → cert 8393-7438-5230-3319-1996. SAP-Schema-17.1 — full-SAP
|
||||
# END-TERRACE BUNGALOW (single-storey), 2016 (band L), measured U walls 0.19 /
|
||||
# roof 0.11 / floor 0.12, mains-gas COMBI (PCDB 16841 Vaillant ecoTEC plus 824),
|
||||
# double glazed (~11.9 m²), party wall 10.99 m² (CF filled, U≈0), natural vent +
|
||||
# 2 extract fans, AP50 3.85, 9 LED, TFA 56 m². Lodged 81; engine 81 (EXACT
|
||||
# match). Built in Elmhurst RdSAP10 (evidence saved): worksheet 78. The +3
|
||||
# (engine 81 vs Elmhurst 78) is the documented full-SAP→RdSAP residual — the
|
||||
# cert's measured U-values beat Elmhurst's RdSAP band-L age defaults; engine on
|
||||
# Elmhurst's own parsed inputs = 78.29 ≈ worksheet 78 → calculator faithful.
|
||||
# PINNED to the observed engine 81 = lodged — mapping untuned.
|
||||
RealCertExpectation(
|
||||
schema="SAP-Schema-17.1",
|
||||
sample="uprn_10093115480",
|
||||
cert_num="8393-7438-5230-3319-1996",
|
||||
sap_score=81,
|
||||
),
|
||||
)
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue