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Pin uprn_10093116324 (full-SAP gas-combi bungalow): engine 79 vs Elmhurst 74

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4th sibling full-SAP cert validated against Elmhurst. Engine 79 (lodged 80);
Elmhurst worksheet 74. The +5 is the documented full-SAP→RdSAP residual — engine
uses the cert's measured U-values (wall 0.19/floor 0.12/roof 0.12) + PCDB combi
17505 (88.5%); Elmhurst uses RdSAP band-L defaults + generic 84% BGW combi. Build
verified clean (single-storey bungalow, no phantom conservatory, TFA 52/51.9).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Jun-te Kim 2026-06-17 09:10:36 +00:00
parent d87718f316
commit 3eb0022034
4 changed files with 19 additions and 1 deletions
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2
.claude/skills/expand-sap-accuracy-corpus/worklist.md
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@ -63,7 +63,7 @@ UPRNs needed for end-to-end testing (also tracked in The 100 below).
- [⚠] 10094601280 — SAP-18.0.0 · eng 81 / lodged 84 · 🚩 MVHR idx 500230 not credited (flagged)
- [⚠] 10093386418 — SAP-17.1 · eng 81 / lodged 82 · 🚩 MVHR idx 500230 not credited (flagged)
- [⚠] 100090108846 — RdSAP-20.0.0 · eng 64 / lodged 79 · 🚩 heat-pump fuel-39 (flagged)
- [ ] 10093116324 — SAP-17.1 · eng 79 / lodged 80
- [x] 10093116324 — SAP-17.1 (2017 gas-combi semi-detached BUNGALOW, TFA 52) · eng 79 / elm 74 (lodged 80) · PINNED engine 79. +5 = documented full-SAP→RdSAP residual (measured wall 0.19/floor 0.12/roof 0.12 + PCDB combi 17505 88.5% vs Elmhurst RdSAP band-L defaults + generic 84%). Build clean (storeys=1, no conservatory). No mapper change.
- [ ] 10094895444 — SAP-18.0.0 · eng 82 / lodged 85
- [⚠] 10092973960 — SAP-17.1 · eng 80 / lodged 84 · 🚩 MVHR idx 500229 not credited (flagged)
- [ ] 10012028763 — SAP-17.1 · eng 85 / lodged 83

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backend/epc_api/json_samples/real_life_examples/SAP-Schema-17.1/uprn_10093116324/elmhurst_summary.pdf Normal file
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backend/epc_api/json_samples/real_life_examples/SAP-Schema-17.1/uprn_10093116324/elmhurst_worksheet.pdf Normal file
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18
tests/domain/sap10_calculator/test_real_cert_sap_accuracy.py
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@ -185,6 +185,24 @@ _EXPECTATIONS: Final[tuple[RealCertExpectation, ...]] = (
cert_num="8178-7436-5600-9809-0906",
sap_score=81,
),
# UPRN 10093116324 → cert (SAP-Schema-17.1). FULL-SAP 2017 mains-gas combi
# SEMI-DETACHED BUNGALOW (single storey, Emsworth, TFA 52 m²), forced through
# the RdSAP SAP-10 engine. Lodged 80; engine produces 79. Built in Elmhurst
# RdSAP10 on the lodged inputs (evidence saved: elmhurst_summary.pdf /
# elmhurst_worksheet.pdf): Elmhurst worksheet SAP 74. The +5 (79 vs 74) is the
# same full-SAP→RdSAP methodology gap as the sibling certs 10093116543/529:
# the engine uses the cert's MEASURED U-values (wall 0.19, floor 0.12, roof
# 0.12) + PCDB combi 17505 (88.5%); Elmhurst RdSAP forces band-L defaults +
# the generic 84% BGW combi (PCDB search disabled). Build verified clean
# (no phantom conservatory, TFA 52/51.9, storeys=1, party wall 6.37). PINNED
# TO THE OBSERVED 79 — mapping untuned; the Elmhurst delta is the documented
# full-SAP residual, not a bug.
RealCertExpectation(
schema="SAP-Schema-17.1",
sample="uprn_10093116324",
cert_num="0455-3835-7888-9493-2531",
sap_score=79,
),
# UPRN 10002468137 → cert 0215-2818-7357-9703-2145. RdSAP-Schema-17.1,
# all-electric high-heat-retention storage heaters on Economy 7, solid-
# brick uninsulated end-terrace. Validated against Elmhurst RdSAP10 on