diff --git a/src/app/db/schema/landlord_overrides.ts b/src/app/db/schema/landlord_overrides.ts
index f8a5952f..99c82f1d 100644
--- a/src/app/db/schema/landlord_overrides.ts
+++ b/src/app/db/schema/landlord_overrides.ts
@@ -178,6 +178,7 @@ export const GlazingValues: [string, ...string[]] = [
   "Double glazing, pre-2002",
   "Triple glazing, pre-2002",
   "Triple glazing, 2002 or later",
+  "Mixed glazing",
   "Unknown",
 ];