diff --git a/backend/Property.py b/backend/Property.py
index 3fac3667..d000be28 100644
--- a/backend/Property.py
+++ b/backend/Property.py
@@ -1,4 +1,5 @@
 import os
+import ast
 from itertools import groupby
 import pandas as pd
 
@@ -77,7 +78,8 @@ class Property:
         # This is a list of measures that have already been installed in the property, typically found as a result
         # of the non-invasive surveys. We reflect that this has been installed in the recommendations, but remove the
         # cost and instead, provide a message that the measure has already been installed
-        self.override = override
+
+        self.override = ast.literal_eval(override['overrides']) if override is not None else []
 
         self.uprn = epc_record.get("uprn")
         self.full_sap_epc = epc_record.get("full_sap_epc")
diff --git a/recommendations/WallRecommendations.py b/recommendations/WallRecommendations.py
index 6b59c148..3acc17f0 100644
--- a/recommendations/WallRecommendations.py
+++ b/recommendations/WallRecommendations.py
@@ -8,7 +8,7 @@ from backend.Property import Property
 from BaseUtility import Definitions
 from recommendations.recommendation_utils import (
     r_value_per_mm_to_u_value, calculate_u_value_uplift, is_diminishing_returns, update_lowest_selected_u_value,
-    get_recommended_part, get_wall_u_value
+    get_recommended_part, get_wall_u_value, override_costs
 )
 from recommendations.config import PARTIALLY_FILLED_PERCENTAGE_ASSUMPTION
 from recommendations.Costs import Costs
@@ -221,6 +221,10 @@ class WallRecommendations(Definitions):
                     material=material.to_dict(),
                 )
 
+                is_override = "cavity_wall_insulation" in cost_result
+                if is_override:
+                    cost_result = override_costs(cost_result)
+
                 recommendations.append(
                     {
                         "phase": phase,
@@ -237,6 +241,7 @@ class WallRecommendations(Definitions):
                         "starting_u_value": u_value,
                         "new_u_value": new_u_value,
                         "sap_points": None,
+                        "is_override": is_override,
                         **cost_result
                     }
                 )
@@ -277,12 +282,19 @@ class WallRecommendations(Definitions):
                             material=material.to_dict(),
                             non_insulation_materials=non_insulation_materials
                         )
+                        is_override = "internal_wall_insulation" in cost_result
+                        if is_override:
+                            cost_result = override_costs(cost_result)
+
                     elif material["type"] == "external_wall_insulation":
                         cost_result = self.costs.external_wall_insulation(
                             wall_area=self.property.insulation_wall_area,
                             material=material.to_dict(),
                             non_insulation_materials=non_insulation_materials
                         )
+                        is_override = "external_wall_insulation" in cost_result
+                        if is_override:
+                            cost_result = override_costs(cost_result)
                     else:
                         raise ValueError("Invalid material type")
 
@@ -301,6 +313,7 @@ class WallRecommendations(Definitions):
                             "description": self._make_description(material),
                             "starting_u_value": u_value,
                             "new_u_value": new_u_value,
+                            "is_override": is_override,
                             "sap_points": None,
                             **cost_result
                         }
diff --git a/recommendations/recommendation_utils.py b/recommendations/recommendation_utils.py
index 0d5f9743..a3043c31 100644
--- a/recommendations/recommendation_utils.py
+++ b/recommendations/recommendation_utils.py
@@ -767,3 +767,15 @@ def check_simulation_difference(old_config, new_config):
     differences = {key + "_ending": new_config[key] for key in new_config if old_config[key] != new_config[key]}
 
     return differences
+
+
+def override_costs(costs):
+    """
+    If the method is overridden, we want to make sure that the costs are zero. This function sets the costs to zero
+    :param costs: Dictionary of costing, as returned by the Costs class
+    :return:
+    """
+    for k in costs:
+        costs[k] = 0
+
+    return costs