diff --git a/backend/engine/engine.py b/backend/engine/engine.py
index 67353b7a..e833eb89 100644
--- a/backend/engine/engine.py
+++ b/backend/engine/engine.py
@@ -1051,11 +1051,14 @@ async def model_engine(body: PlanTriggerRequest):
             property_required_measures = [m for m in recommendations[p.id] if m[0]["type"] in body.required_measures]
             measures_to_optimise = [m for m in recommendations[p.id] if m[0]["type"] not in body.required_measures]
 
+            ventilation_included = "ventilation" in property_measure_types
+
             # If a measure requiring ventilation is selected, and the property does not have ventilation, we enfore
             # its inclusion
+
             needs_ventilation = any(
                 x in property_measure_types for x in assumptions.measures_needing_ventilation
-            ) and not p.has_ventilation
+            ) and not p.has_ventilation and ventilation_included
 
             if not measures_to_optimise:
                 # Nothing to do, we just reshape the recommendations