diff --git a/etl/customers/vectis/outputs.py b/etl/customers/vectis/outputs.py
index 67e27bd9..333d2494 100644
--- a/etl/customers/vectis/outputs.py
+++ b/etl/customers/vectis/outputs.py
@@ -220,7 +220,7 @@ def app():
         "patches_file_path": "",
         "non_invasive_recommendations_file_path": non_invasive_recommendations_filename,
         "inclusions": [
-            "draught_proofing", "mixed_glazing", "trickle_vents", "low_energy_lighting",
+            "draught_proofing", "mixed_glazing", "trickle_vents", "low_energy_lighting", "windows"
         ],
         "budget": None,
         "scenario_name": "Quick wins - do now while tenanted",
@@ -244,7 +244,8 @@ def app():
             "low_energy_lighting",
             "suspended_floor_insulation",
             "internal_wall_insulation",
-            "room_roof_insulation"
+            "room_roof_insulation",
+            "windows"
         ],
         "budget": None,
         "scenario_name": "Do when void",
diff --git a/recommendations/Costs.py b/recommendations/Costs.py
index 8deed75a..908a409a 100644
--- a/recommendations/Costs.py
+++ b/recommendations/Costs.py
@@ -168,9 +168,8 @@ class Costs:
     # https://www.greenmatch.co.uk/windows/double-glazing/cost
     SASH_WINDOW_INFLATION_FACTOR = 1.5
 
-    # Typically, secondary glazing can be installed for 25% of the cost of double glazed windows - to be conservative,
-    # we scale the cost by half
-    SECONDARY_GLAZING_SCALING_FACTOR = 0.5
+    # Based on relative costs from SCIS
+    SECONDARY_GLAZING_SCALING_FACTOR = 0.85
 
     def __init__(self, property_instance):
         """
diff --git a/recommendations/Recommendations.py b/recommendations/Recommendations.py
index db9a6320..d2c1db1b 100644
--- a/recommendations/Recommendations.py
+++ b/recommendations/Recommendations.py
@@ -102,6 +102,7 @@ class Recommendations:
         property_recommendations = []
         phase = 0
         measures = self.find_included_measures()
+        non_invasive_recommendation_types = [r["type"] for r in self.property_instance.non_invasive_recommendations]
 
         # Building Fabric
         self.wall_recomender.recommend(phase=phase, measures=measures)
@@ -149,7 +150,8 @@ class Recommendations:
                 property_recommendations.append(self.floor_recommender.recommendations)
                 phase += 1
 
-        if "windows" in measures:
+        if "windows" in measures and "mixed_glazing" not in non_invasive_recommendation_types:
+            # If we have a mixed glazing recommendation, we prioritise this over the windows recommendation
             self.windows_recommender.recommend(phase=phase)
             if self.windows_recommender.recommendation:
                 property_recommendations.append(self.windows_recommender.recommendation)
@@ -529,7 +531,7 @@ class Recommendations:
 
                 # For the moment, we cap the number of SAP points that can be achieved by LEDs at 2
                 if rec["type"] == "low_energy_lighting":
-                    
+
                     if property_instance.data["low-energy-lighting"] < 50:
                         lighting_sap_limit = LightingRecommendations.SAP_LIMIT
                     else: