diff --git a/backend/app/db/functions/recommendations_functions.py b/backend/app/db/functions/recommendations_functions.py
index f7b5f5eb..57ccf65c 100644
--- a/backend/app/db/functions/recommendations_functions.py
+++ b/backend/app/db/functions/recommendations_functions.py
@@ -46,7 +46,7 @@ def prepare_plan_data(
 
     # plan costing data
     cost_of_works = sum([r["total"] for r in default_recommendations])
-    contingency_cost = sum([r["contingency"] for r in default_recommendations])
+    contingency_cost = sum([r.get("contingency", 0) for r in default_recommendations])
 
     return {
         "portfolio_id": body.portfolio_id,
@@ -73,8 +73,8 @@ def prepare_plan_data(
         "energy_consumption_savings": float(energy_consumption_savings),
         "valuation_post_retrofit": valuation_post_retrofit,
         "valuation_increase": valuation_increase,
-        "cost_of_works": cost_of_works,
-        "contingency_cost": contingency_cost,
+        "cost_of_works": float(cost_of_works),
+        "contingency_cost": float(contingency_cost),
         "plan_type": eco_packages.get(p.id, (None, None, None))[2]
     }