diff --git a/types/schemas/prototypeApplication/enums/BuildingRegulation.ts b/types/schemas/prototypeApplication/enums/BuildingRegulation.ts
new file mode 100644
index 00000000..991e9731
--- /dev/null
+++ b/types/schemas/prototypeApplication/enums/BuildingRegulation.ts
@@ -0,0 +1,25 @@
+/**
+ * @description Part M4(2) of the Building Regulations 2010
+ */
+type M42 = 'm42';
+
+/**
+ * @description Part M4(3)(2a) of the Building Regulations 2010
+ */
+type M432a = 'm432a';
+
+/**
+ * @description Part M4(3)(2b) of the Building Regulations 2010
+ */
+type M432b = 'm432b';
+
+/**
+ * @description None of these
+ */
+type None = 'none';
+
+/**
+ * @id #BuildingRegulation
+ * @description Building regulations
+ */
+export type BuildingRegulation = M42 | M432a | M432b | None;