diff --git a/datatypes/epc/domain/mapper.py b/datatypes/epc/domain/mapper.py
index 5f9e7231..97ae3739 100644
--- a/datatypes/epc/domain/mapper.py
+++ b/datatypes/epc/domain/mapper.py
@@ -734,6 +734,7 @@ class EpcPropertyDataMapper:
         door_count, insulated_door_u = _sap_door_aggregates(schema)
         return EpcPropertyData(
             uprn=schema.uprn,
+            assessment_type=schema.assessment_type,
             # 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).
diff --git a/datatypes/epc/schema/sap_schema_17_1.py b/datatypes/epc/schema/sap_schema_17_1.py
index 8a0b2220..5105ec8c 100644
--- a/datatypes/epc/schema/sap_schema_17_1.py
+++ b/datatypes/epc/schema/sap_schema_17_1.py
@@ -213,6 +213,8 @@ class SapSchema17_1:
     # cert has no secondary. Read by the calculator's cert_to_inputs — dropping
     # it under-counts a real secondary heater (ADR-0037).
     secondary_heating: Optional[EnergyElement] = None
+    # "SAP" for this family (vs "RdSAP"); carried for provenance / the panel.
+    assessment_type: Optional[str] = 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