diff --git a/tests/backend/app/modelling/test_property_filters.py b/tests/backend/app/modelling/test_property_filters.py
index 22d7a204b..b9439cf51 100644
--- a/tests/backend/app/modelling/test_property_filters.py
+++ b/tests/backend/app/modelling/test_property_filters.py
@@ -196,6 +196,30 @@ def test_epc_numeric_property_type_codes_map_to_labels(db_engine: Engine) -> Non
     assert [p.property_id for p in resolved] == [coded]
 
 
+def test_epc_without_property_type_falls_back_to_dwelling_type(
+    db_engine: Engine,
+) -> None:
+    # arrange — cert lodged with no property_type column, only dwelling_type
+    with Session(db_engine) as session:
+        fallback = _seed_property(session, portfolio_id=814)
+        _seed_epc(
+            session,
+            property_id=fallback,
+            property_type=None,
+            dwelling_type="Bungalow",
+        )
+
+        # act
+        resolved = resolve_filtered_property_ids(
+            session,
+            portfolio_id=814,
+            filters=PropertyGroupFilters(property_types=["Bungalow"]),
+        )
+
+    # assert
+    assert [p.property_id for p in resolved] == [fallback]
+
+
 def test_postcode_filter_matches_exactly(db_engine: Engine) -> None:
     # arrange
     with Session(db_engine) as session: