diff --git a/recommendations/tests/test_wall_recommendations.py b/recommendations/tests/test_wall_recommendations.py
index 81d040c5..d4ce5884 100644
--- a/recommendations/tests/test_wall_recommendations.py
+++ b/recommendations/tests/test_wall_recommendations.py
@@ -682,4 +682,49 @@ class TestCavityWallRecommensations:
         assert recommender5.recommendations[6]["parts"][0]["type"] == "internal_wall_insulation"
         assert recommender5.recommendations[6]["parts"][0]["depths"] == [100]
 
+    def test_sandstone_or_limestone_wall(self):
+        input_property6 = Property(id=1, postcode="F4k3 6", address1="623 fake street", epc_client=Mock())
+        input_property6.walls = {
+            'original_description': 'Sandstone or limestone, as built, no insulation (assumed)',
+            'clean_description': 'Sandstone or limestone, as built, no insulation',
+            'thermal_transmittance': None, 'thermal_transmittance_unit': None,
+            'is_cavity_wall': False, 'is_filled_cavity': False, 'is_solid_brick': False,
+            'is_system_built': False, 'is_timber_frame': False, 'is_granite_or_whinstone': False,
+            'is_as_built': False, 'is_cob': False, 'is_assumed': False,
+            'is_sandstone_or_limestone': True, 'is_park_home': False,
+            'insulation_thickness': 'none', 'external_insulation': False,
+            'internal_insulation': False
+        }
+        input_property6.age_band = "F"
+        input_property6.insulation_wall_area = 350
+        input_property6.restricted_measures = False
+        input_property6.data = {"property-type": "House"}
 
+        assert input_property6.walls["is_sandstone_or_limestone"]
+
+        recommender6 = WallRecommendations(
+            property_instance=input_property6,
+            materials=internal_wall_insulation_parts + external_wall_insulation_parts
+        )
+
+        assert not recommender6.recommendations
+
+        recommender6.recommend()
+
+        assert recommender6.recommendations
+        assert len(recommender6.recommendations) == 6
+        assert recommender6.estimated_u_value == 1
+        assert np.isclose(recommender6.recommendations[0]["new_u_value"], 0.29)
+        assert np.isclose(recommender6.recommendations[0]["cost"], 31500)
+        assert recommender6.recommendations[0]["parts"][0]["type"] == "external_wall_insulation"
+        assert recommender6.recommendations[0]["parts"][0]["depths"] == [90]
+
+        assert np.isclose(recommender6.recommendations[2]["new_u_value"], 0.28)
+        assert np.isclose(recommender6.recommendations[2]["cost"], 35000)
+        assert recommender6.recommendations[2]["parts"][0]["type"] == "external_wall_insulation"
+        assert recommender6.recommendations[2]["parts"][0]["depths"] == [100]
+
+        assert np.isclose(recommender6.recommendations[4]["new_u_value"], 0.28)
+        assert np.isclose(recommender6.recommendations[4]["cost"], 35000)
+        assert recommender6.recommendations[4]["parts"][0]["type"] == "internal_wall_insulation"
+        assert recommender6.recommendations[4]["parts"][0]["depths"] == [100]