diff --git a/.claude/skills/expand-sap-accuracy-corpus/worklist.md b/.claude/skills/expand-sap-accuracy-corpus/worklist.md
index c062be22..2890163c 100644
--- a/.claude/skills/expand-sap-accuracy-corpus/worklist.md
+++ b/.claude/skills/expand-sap-accuracy-corpus/worklist.md
@@ -86,7 +86,7 @@ Skip the 🚩 MVHR / 🚩 heat-pump-fuel and ⛔ sparse certs.
 - [⚠] 10091636116 — SAP-17.0 · eng 80 / lodged 88 · 🚩 MVHR idx 500249 not credited (flagged)
 - [ ] 10093049853 — SAP-17.0 · eng 82 / lodged 87
 - [ ] 10093390790 — SAP-17.1 · eng 79 / lodged 82
-- [ ] 10093116330 — SAP-17.1 · eng 82 / lodged 83
+- [x] 10093116330 — SAP-17.1 (2017 gas-combi 2-storey semi HOUSE, TFA 73) · eng 82 / elm 78 (lodged 83) · PINNED engine 82. +4 = documented full-SAP→RdSAP residual. Build clean. No mapper change.
 - [ ] 10093116326 — SAP-17.1 · eng 82 / lodged 82
 - [ ] 10090317693 — SAP-17.0 · eng 81 / lodged 88
 - [ ] 10090034872 — SAP-17.0 · eng 83 / lodged 85
diff --git a/backend/epc_api/json_samples/real_life_examples/SAP-Schema-17.1/uprn_10093116330/elmhurst_summary.pdf b/backend/epc_api/json_samples/real_life_examples/SAP-Schema-17.1/uprn_10093116330/elmhurst_summary.pdf
new file mode 100644
index 00000000..c830b3f9
Binary files /dev/null and b/backend/epc_api/json_samples/real_life_examples/SAP-Schema-17.1/uprn_10093116330/elmhurst_summary.pdf differ
diff --git a/backend/epc_api/json_samples/real_life_examples/SAP-Schema-17.1/uprn_10093116330/elmhurst_worksheet.pdf b/backend/epc_api/json_samples/real_life_examples/SAP-Schema-17.1/uprn_10093116330/elmhurst_worksheet.pdf
new file mode 100644
index 00000000..b1bbad34
Binary files /dev/null and b/backend/epc_api/json_samples/real_life_examples/SAP-Schema-17.1/uprn_10093116330/elmhurst_worksheet.pdf differ
diff --git a/tests/domain/sap10_calculator/test_real_cert_sap_accuracy.py b/tests/domain/sap10_calculator/test_real_cert_sap_accuracy.py
index 89bcee3d..715fb053 100644
--- a/tests/domain/sap10_calculator/test_real_cert_sap_accuracy.py
+++ b/tests/domain/sap10_calculator/test_real_cert_sap_accuracy.py
@@ -228,6 +228,16 @@ _EXPECTATIONS: Final[tuple[RealCertExpectation, ...]] = (
         cert_num="7608-9066-7346-5236-4944",
         sap_score=83,
     ),
+    # UPRN 10093116330 — SAP-Schema-17.1, FULL-SAP 2017 mains-gas combi
+    # 2-storey SEMI-DETACHED HOUSE (Emsworth, TFA 73 m²), same 10093116xxx street
+    # / boiler PCDB 17505. Lodged 83; engine 82. Elmhurst worksheet 78 (evidence
+    # saved). The +4 is the documented full-SAP→RdSAP residual. Build clean.
+    RealCertExpectation(
+        schema="SAP-Schema-17.1",
+        sample="uprn_10093116330",
+        cert_num="8318-7437-5660-3332-6922",
+        sap_score=82,
+    ),
     # 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