diff --git a/backend/Property.py b/backend/Property.py
index 10af56cc..70a70307 100644
--- a/backend/Property.py
+++ b/backend/Property.py
@@ -614,6 +614,9 @@ class Property:
                 # Handling edge case for walls
                 fill_with = False if description == "walls-description" else None
                 fill_dict = dict(zip(template.keys(), [fill_with] * len(template)))
+                if description == "walls-description":
+                    fill_dict["thermal_transmittance_unit"] = None
+                    fill_dict["insulation_thickness"] = "none"
 
                 fill_dict.update(
                     {
diff --git a/etl/epc_clean/epc_attributes/WallAttributes.py b/etl/epc_clean/epc_attributes/WallAttributes.py
index 0e211983..075dee96 100644
--- a/etl/epc_clean/epc_attributes/WallAttributes.py
+++ b/etl/epc_clean/epc_attributes/WallAttributes.py
@@ -148,6 +148,9 @@ class WallAttributes(Definitions):
             for key in self.DEFAULT_KEYS:
                 result[key] = False
 
+            result["thermal_transmittance_unit"] = None
+            result["insulation_thickness"] = "none"
+
             return result
 
         description = self.description.lower()