diff --git a/backend/Property.py b/backend/Property.py
index 4c8bd5bc..d400d439 100644
--- a/backend/Property.py
+++ b/backend/Property.py
@@ -650,6 +650,17 @@ class Property(Definitions):
             self.data["floor-level"] not in self.DATA_ANOMALY_MATCHES else None
         )
 
+        if self.floor_level is None:
+
+            if self.data["property-type"] != "Flat":
+                return
+
+            if self.floor["another_property_below"]:
+                self.floor_level = 1
+            else:
+                self.floor_level = 0
+            return
+
         # We perform some extra checks, if the property is not on the ground floor, as we have found cases
         # where a property is marked as being on the first floor
         if self.floor_level > 0:
diff --git a/backend/tests/test_property.py b/backend/tests/test_property.py
index 9188f545..871c9291 100644
--- a/backend/tests/test_property.py
+++ b/backend/tests/test_property.py
@@ -423,3 +423,18 @@ class TestProperty:
         prop3.set_floor_level()
 
         assert prop3.floor_level == 2
+
+        # Example of a house
+        prop4 = Property(1, "AB12CD", "Test Address", mock_epc_client)
+        prop4.data = {'floor-level': '', 'property-type': 'House'}
+        prop4.floor = {
+            'original_description': '(Another dwelling below)', 'clean_description': 'Solid, no insulation',
+            'thermal_transmittance': None, 'thermal_transmittance_unit': None, 'is_assumed': False,
+            'is_to_unheated_space': False, 'is_to_external_air': False, 'is_suspended': False, 'is_solid': False,
+            'another_property_below': False, 'insulation_thickness': 'none', 'floor_thermal_transmittance': None,
+            'floor_insulation_thickness': 'none'
+        }
+
+        prop4.set_floor_level()
+
+        assert prop4.floor_level is None