diff --git a/backend/Funding.py b/backend/Funding.py
index 0689d33b..59547058 100644
--- a/backend/Funding.py
+++ b/backend/Funding.py
@@ -11,7 +11,7 @@ class EligibilityCaveats(Enum):
     TENANT_ON_BENEFITS_OR_LOW_INCOME = "tenant_on_benefits_or_low_income"
     INNOVATION_REQUIRED = "innovation_required"
     SOLAR_NEEDS_HEATING = "solar_needs_heating"
-    MINIMUM_INSULATION_PRECONDITIONS_NOT_MET = "minimum_insulation_preconditions_not_met"
+    MINIMUM_INSULATION_PRECONgiDITIONS_NOT_MET = "minimum_insulation_preconditions_not_met"
 
 
 class Funding:
@@ -39,6 +39,8 @@ class Funding:
         partial_project_scores_matrix,
         whlg_eligible_postcodes
     ):
+        if tenure not in [HousingType.PRIVATE, HousingType.SOCIAL]:
+            raise ValueError("Invalid tenure type. Must be 'Private' or 'Social'.")
         self.tenure = tenure
         self.eco4_social_cavity_abs_rate = eco4_social_cavity_abs_rate
         self.eco4_social_solid_abs_rate = eco4_social_solid_abs_rate