diff --git a/backend/SearchEpc.py b/backend/SearchEpc.py
index b400b8f1..5504d573 100644
--- a/backend/SearchEpc.py
+++ b/backend/SearchEpc.py
@@ -474,7 +474,9 @@ class SearchEpc:
 
                     # We handle some edge cases experiences with maisonettes - if built form is detatched, just filter
                     # on maisonette
-                    if (estimation_property_type == "Maisonette") & (estimation_built_form == "Detached"):
+                    if (estimation_property_type == "Maisonette") & (
+                        estimation_built_form in ["Detached", "Semi-Detached"]
+                    ):
                         epc_data = epc_data[epc_data["property-type"] == estimation_property_type]
                     else:
                         epc_data = epc_data[