diff --git a/recommendations/tests/test_wall_recommendations.py b/recommendations/tests/test_wall_recommendations.py
index 334c02b7..81d040c5 100644
--- a/recommendations/tests/test_wall_recommendations.py
+++ b/recommendations/tests/test_wall_recommendations.py
@@ -634,3 +634,52 @@ class TestCavityWallRecommensations:
         assert np.isclose(recommender4.recommendations[1]["cost"], 11150)
         assert recommender4.recommendations[1]["parts"][0]["type"] == "external_wall_insulation"
         assert recommender4.recommendations[1]["parts"][0]["depths"] == [50]
+
+    def test_cob_wall(self):
+        input_property5 = Property(id=1, postcode="F4k3 2", address1="223 fake street", epc_client=Mock())
+        input_property5.walls = {
+            'original_description': 'Cob, as built',
+            'clean_description': 'Cob, as built',
+            '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': True, 'is_assumed': False,
+            'is_sandstone_or_limestone': False, 'is_park_home': False,
+            'insulation_thickness': 'none', 'external_insulation': False,
+            'internal_insulation': False
+        }
+        input_property5.age_band = "E"
+        input_property5.insulation_wall_area = 77
+        input_property5.restricted_measures = False
+        input_property5.data = {"property-type": "Bungalow"}
+
+        assert input_property5.walls["is_cob"]
+
+        recommender5 = WallRecommendations(
+            property_instance=input_property5,
+            materials=internal_wall_insulation_parts + external_wall_insulation_parts
+        )
+
+        assert not recommender5.recommendations
+
+        recommender5.recommend()
+
+        assert recommender5.recommendations
+        assert len(recommender5.recommendations) == 9
+        assert recommender5.estimated_u_value == 0.8
+        assert np.isclose(recommender5.recommendations[0]["new_u_value"], 0.29)
+        assert np.isclose(recommender5.recommendations[0]["cost"], 6160)
+        assert recommender5.recommendations[0]["parts"][0]["type"] == "external_wall_insulation"
+        assert recommender5.recommendations[0]["parts"][0]["depths"] == [80]
+
+        assert np.isclose(recommender5.recommendations[3]["new_u_value"], 0.26)
+        assert np.isclose(recommender5.recommendations[3]["cost"], 7700)
+        assert recommender5.recommendations[3]["parts"][0]["type"] == "external_wall_insulation"
+        assert recommender5.recommendations[3]["parts"][0]["depths"] == [100]
+
+        assert np.isclose(recommender5.recommendations[6]["new_u_value"], 0.26)
+        assert np.isclose(recommender5.recommendations[6]["cost"], 7700)
+        assert recommender5.recommendations[6]["parts"][0]["type"] == "internal_wall_insulation"
+        assert recommender5.recommendations[6]["parts"][0]["depths"] == [100]
+
+