diff --git a/etl/epc_clean/epc_attributes/WindowAttributes.py b/etl/epc_clean/epc_attributes/WindowAttributes.py
index e9139510..a52977e6 100644
--- a/etl/epc_clean/epc_attributes/WindowAttributes.py
+++ b/etl/epc_clean/epc_attributes/WindowAttributes.py
@@ -33,12 +33,18 @@ class WindowAttributes(Definitions):
         "gwydrau lluosog ym mhobman": "multiple glazing throughout",
     }
 
+    # These are observed data anomalies that we want to ignore
+    NO_DATA_CASES = [
+        "SAP05:Windows",
+        "Solid, no insulation (assumed)",  # A description typically associated with floors, not windows
+    ]
+
     def __init__(self, description: str):
         self.description: str = clean_description(description.lower())
 
         # In the case of an empty description, we want to return a dictionary with all values set to False
         # and indicate there was no data
-        self.nodata = not description or description in self.DATA_ANOMALY_MATCHES or description == "SAP05:Windows"
+        self.nodata = not description or description in self.DATA_ANOMALY_MATCHES or description in self.NO_DATA_CASES
 
         translation = self.WELSH_TEXT.get(self.description)
         if translation: