diff --git a/backend/Property.py b/backend/Property.py
index d400d439..705ad361 100644
--- a/backend/Property.py
+++ b/backend/Property.py
@@ -275,6 +275,10 @@ class Property(Definitions):
         # We need to implement an EPC cleaning process, which we run on the EPC data, immediately after we download
         # it
         self.data["built-form"] = BUILT_FORM_REMAP.get(self.data["built-form"], self.data["built-form"])
+        if self.data["built-form"] in self.DATA_ANOMALY_MATCHES:
+            if self.data["property-type"] == "Flat":
+                self.data["built-form"] = "Semi-Detached"
+
         self.set_energy()
         self.set_ventilation()
         self.set_solar_pv()