diff --git a/recommendations/tests/test_wall_recommendations.py b/recommendations/tests/test_wall_recommendations.py
index 4a224734..18560118 100644
--- a/recommendations/tests/test_wall_recommendations.py
+++ b/recommendations/tests/test_wall_recommendations.py
@@ -300,6 +300,7 @@ class TestCavityWallRecommensations:
         input_property.age_band = "C"
         input_property.insulation_wall_area = 50
         input_property.construction_age_band = "England and Wales: 1930-1949"
+        input_property.already_installed = []
 
         recommender = WallRecommendations(
             property_instance=input_property,
@@ -313,7 +314,7 @@ class TestCavityWallRecommensations:
         assert recommender.recommendations
         assert recommender.estimated_u_value == 1.5
         assert np.isclose(recommender.recommendations[0]["new_u_value"], 0.35)
-        assert np.isclose(recommender.recommendations[0]["total"], 710.5)
+        assert np.isclose(recommender.recommendations[0]["total"], 925)
 
     def test_fill_partial_filled_cavity(self):
         epc_record = EPCRecord()
@@ -333,6 +334,7 @@ class TestCavityWallRecommensations:
         input_property.age_band = "C"
         input_property.insulation_wall_area = 50
         input_property.construction_age_band = "England and Wales: 1930-1949"
+        input_property.already_installed = []
 
         recommender = WallRecommendations(
             property_instance=input_property,
@@ -346,7 +348,7 @@ class TestCavityWallRecommensations:
         assert recommender.recommendations
         assert recommender.estimated_u_value == 1.3
         assert np.isclose(recommender.recommendations[0]["new_u_value"], 0.41)
-        assert np.isclose(recommender.recommendations[0]["total"], 710.5)
+        assert np.isclose(recommender.recommendations[0]["total"], 925.0)
 
     def test_system_built_wall(self):
         epc_record = EPCRecord()
@@ -369,6 +371,7 @@ class TestCavityWallRecommensations:
         input_property2.insulation_wall_area = 120
         input_property2.restricted_measures = False
         input_property2.construction_age_band = "England and Wales: 1976-1982"
+        input_property2.already_installed = []
 
         assert input_property2.walls["is_system_built"]
 
@@ -390,7 +393,7 @@ class TestCavityWallRecommensations:
         assert recommender2.recommendations[0]["parts"][0]["depth"] == 150
 
         assert np.isclose(recommender2.recommendations[1]["new_u_value"], 0.26)
-        assert np.isclose(recommender2.recommendations[1]["total"], 29376)
+        assert np.isclose(recommender2.recommendations[1]["total"], 23400)
         assert recommender2.recommendations[1]["parts"][0]["type"] == "internal_wall_insulation"
         assert recommender2.recommendations[1]["parts"][0]["depth"] == 95
 
@@ -416,6 +419,7 @@ class TestCavityWallRecommensations:
         input_property3.insulation_wall_area = 99
         input_property3.restricted_measures = False
         input_property3.construction_age_band = "England and Wales: 1950-1966"
+        input_property3.already_installed = []
 
         assert input_property3.walls["is_timber_frame"]
 
@@ -437,7 +441,7 @@ class TestCavityWallRecommensations:
         assert recommender3.recommendations[0]["parts"][0]["depth"] == 150.0
 
         assert np.isclose(recommender3.recommendations[1]["new_u_value"], 0.29)
-        assert np.isclose(recommender3.recommendations[1]["total"], 24235.2)
+        assert np.isclose(recommender3.recommendations[1]["total"], 19305.0)
         assert recommender3.recommendations[1]["parts"][0]["type"] == "internal_wall_insulation"
         assert recommender3.recommendations[1]["parts"][0]["depth"] == 95.0
 
@@ -463,6 +467,7 @@ class TestCavityWallRecommensations:
         input_property4.insulation_wall_area = 223
         input_property4.restricted_measures = False
         input_property4.construction_age_band = "England and Wales: before 1900"
+        input_property4.already_installed = []
 
         assert input_property4.walls["is_granite_or_whinstone"]
 
@@ -484,7 +489,7 @@ class TestCavityWallRecommensations:
         assert recommender4.recommendations[0]["parts"][0]["depth"] == 150
 
         assert np.isclose(recommender4.recommendations[1]["new_u_value"], 0.3)
-        assert np.isclose(recommender4.recommendations[1]["total"], 54590.4)
+        assert np.isclose(recommender4.recommendations[1]["total"], 43485.0)
         assert recommender4.recommendations[1]["parts"][0]["type"] == "internal_wall_insulation"
         assert recommender4.recommendations[1]["parts"][0]["depth"] == 95
 
@@ -510,6 +515,7 @@ class TestCavityWallRecommensations:
         input_property5.insulation_wall_area = 77
         input_property5.restricted_measures = False
         input_property5.construction_age_band = "England and Wales: 1967-1975"
+        input_property5.already_installed = []
 
         assert input_property5.walls["is_cob"]