diff --git a/datatypes/epc/domain/mapper.py b/datatypes/epc/domain/mapper.py
index bb21b8974..24ee6d65e 100644
--- a/datatypes/epc/domain/mapper.py
+++ b/datatypes/epc/domain/mapper.py
@@ -734,6 +734,10 @@ class EpcPropertyDataMapper:
         door_count, insulated_door_u = _sap_door_aggregates(schema)
         return EpcPropertyData(
             uprn=schema.uprn,
+            # SAP 2012 (~9.92) for this family — carried so CalculatorRebaseliner
+            # fires trigger (a) (sap_version < 10.2 → Effective = the SAP-10.2
+            # calc) instead of keeping the lodged SAP-2012 score (ADR-0037).
+            sap_version=schema.sap_version,
             dwelling_type=(
                 schema.dwelling_type
                 if isinstance(schema.dwelling_type, str)
diff --git a/datatypes/epc/schema/sap_schema_17_1.py b/datatypes/epc/schema/sap_schema_17_1.py
index 03d79f2fa..cbd58d72a 100644
--- a/datatypes/epc/schema/sap_schema_17_1.py
+++ b/datatypes/epc/schema/sap_schema_17_1.py
@@ -198,6 +198,10 @@ class SapSchema17_1:
     sap_heating: SapHeating
     sap_energy_source: SapEnergySource = field(default_factory=SapEnergySource)
     sap_ventilation: SapVentilation = field(default_factory=SapVentilation)
+    # SAP spec the cert was lodged under (~9.92 = SAP 2012 for this family).
+    # Drives Rebaselining trigger (a): sap_version < 10.2 → Effective = the
+    # SAP-10.2 calc, not the lodged figure (ADR-0037). Optional defensively.
+    sap_version: Optional[float] = None
     # measured living-room area (m²); the engine consumes it via a back-solved
     # habitable_rooms_count (Table 27). Optional — 100% present in the corpus.
     living_area: Optional[Union[int, float]] = None