diff --git a/model_data/app.py b/model_data/app.py
index 913ff546..b49e3fd5 100644
--- a/model_data/app.py
+++ b/model_data/app.py
@@ -408,6 +408,7 @@ def handler():
     # TODO: Add in the u-values for roofs rather than the description
     # TODO: Add in the actual property features for walls, floors, roof, not just the u-value
     # TODO: Think about how we use sap vs rdsap - should we add a feature in the model for transaction-type?
+    # TODO: Remove cases where descriptions have no data or are error cases
     #
     # property type looks okay - we're definitely low on the number of bungalows
     # number-habitable-rooms & number-heated-rooms is unpopulated so pretty useless atm
diff --git a/model_data/epc_attributes/FloorAttributes.py b/model_data/epc_attributes/FloorAttributes.py
index 589677d6..c53e1627 100644
--- a/model_data/epc_attributes/FloorAttributes.py
+++ b/model_data/epc_attributes/FloorAttributes.py
@@ -7,20 +7,26 @@ class FloorAttributes(BaseUtility):
     DWELLING_BELOW = ["another dwelling below", "other premises below"]
     FLOOR_TYPES = ["assumed", "to unheated space", "to external air", "suspended", "solid"]
 
+    # For the short term, while we are still exploring the data, we maintain a list of error cases which
+    # we want to ignore and consider as no data.
+
+    OBSERVED_ERRORS = ["Conservatory"]
+
     def __init__(self, description: str):
         self.description: str = description.lower()
 
-        self.nodata = not description or description in self.DATA_ANOMALY_MATCHES
+        self.nodata = not description or description in self.DATA_ANOMALY_MATCHES or description in self.OBSERVED_ERRORS
 
-        if not description or not any(
-            rt in self.description for rt in self.FLOOR_TYPES + self.DWELLING_BELOW + ["average thermal transmittance"]
+        if not self.nodata and not any(
+            rt in self.description for rt in
+            self.FLOOR_TYPES + self.DWELLING_BELOW + ["average thermal transmittance"]
         ):
             raise ValueError('Invalid description')
 
     def process(self) -> Dict[str, Union[str, bool, int, None]]:
 
         if self.nodata:
-            return {}
+            return {"no_data": True}
 
         result: Dict[str, Union[float, str, bool, None]] = {}
         description = self.description
diff --git a/model_data/epc_attributes/RoofAttributes.py b/model_data/epc_attributes/RoofAttributes.py
index f0f3e8f6..ec014357 100644
--- a/model_data/epc_attributes/RoofAttributes.py
+++ b/model_data/epc_attributes/RoofAttributes.py
@@ -15,7 +15,7 @@ class RoofAttributes(BaseUtility):
 
         self.description: str = description.lower()
         self.nodata = not description or description in self.DATA_ANOMALY_MATCHES
-
+        
         if not self.nodata and not any(
             rt in self.description for rt in self.ROOF_TYPES + self.DWELLING_ABOVE + ["average thermal transmittance"]
         ):
diff --git a/model_data/tests/test_floor_attributes.py b/model_data/tests/test_floor_attributes.py
index 5cdaa5be..ce17aa3b 100644
--- a/model_data/tests/test_floor_attributes.py
+++ b/model_data/tests/test_floor_attributes.py
@@ -12,8 +12,10 @@ class TestCleanFloor:
         assert floor_attr.description == valid_description.lower()
 
         # Test initialization with an empty description
-        with pytest.raises(ValueError):
-            FloorAttributes('')
+        empty = FloorAttributes('')
+        assert empty.nodata
+        output = empty.process()
+        assert output == {"no_data": True}
 
         # Test initialization with a description that contains none of the keywords
         with pytest.raises(ValueError):
@@ -33,7 +35,6 @@ class TestCleanFloor:
     def test_invalid_description(self):
         # Test that invalid descriptions raise a ValueError
         invalid_descriptions = [
-            "",
             "invalid description",
             "description with no known floor types or thermal transmittance",
         ]
@@ -47,3 +48,8 @@ class TestCleanFloor:
         invalid_description = 'description without keywords'
         with pytest.raises(ValueError):
             FloorAttributes(invalid_description)
+
+    def test_known_errors(self):
+        error_description = "Conservatory"
+        obj = FloorAttributes(error_description)
+        assert obj.nodata