diff --git a/recommendations/Costs.py b/recommendations/Costs.py
index fafc15aa..c855e690 100644
--- a/recommendations/Costs.py
+++ b/recommendations/Costs.py
@@ -91,6 +91,9 @@ class Costs:
             x["Region"] == self.county
         ][0]
 
+        if not self.labour_adjustment_factor:
+            raise ValueError("Labour adjustment factor not found")
+
     def cavity_wall_insulation(self, material):
         """
         Calculates the total cost for cavity wall insulation based on material and labor costs,