diff --git a/app/constants/db_enums.rb b/app/constants/db_enums.rb
index d930fc8d4..99b7b438a 100644
--- a/app/constants/db_enums.rb
+++ b/app/constants/db_enums.rb
@@ -191,4 +191,17 @@ module DbEnums
       "Relet – tenant involved in a succession downsize" => 19,
     }
   end
+
+  def self.unittype_gn
+    {
+      "Flat / maisonette" => 1,
+      "Bed-sit" => 2,
+      "House" => 7,
+      "Bungalow" => 8,
+      "Shared flat / maisonette" => 4,
+      "Shared house" => 9,
+      "Shared bungalow" => 10,
+      "Other" => 6,
+    }
+  end
 end
diff --git a/app/models/case_log.rb b/app/models/case_log.rb
index ba5c7bbfb..f6b4535d0 100644
--- a/app/models/case_log.rb
+++ b/app/models/case_log.rb
@@ -85,6 +85,7 @@ class CaseLog < ApplicationRecord
   enum tenancy: DbEnums.tenancy, _suffix: true
   enum landlord: DbEnums.landlord, _suffix: true
   enum rsnvac: DbEnums.rsnvac, _suffix: true
+  enum unittype_gn: DbEnums.unittype_gn, _suffix: true
 
   enum rp_homeless: DbEnums.polar, _suffix: true
   enum rp_insan_unsat: DbEnums.polar, _suffix: true
diff --git a/db/migrate/20211103090530_change_field_types.rb b/db/migrate/20211103090530_change_field_types.rb
index fbfb20201..3a006cad8 100644
--- a/db/migrate/20211103090530_change_field_types.rb
+++ b/db/migrate/20211103090530_change_field_types.rb
@@ -47,6 +47,7 @@ class ChangeFieldTypes < ActiveRecord::Migration[6.1]
       t.change :tenancy, "integer USING tenancy::integer"
       t.change :landlord, "integer USING landlord::integer"
       t.change :rsnvac, "integer USING rsnvac::integer"
+      t.change :unittype_gn, "integer USING unittype_gn::integer"
     end
   end
 
@@ -98,6 +99,7 @@ class ChangeFieldTypes < ActiveRecord::Migration[6.1]
       t.change :tenancy, :string
       t.change :landlord, :string
       t.change :rsnvac, :string
+      t.change :unittype_gn, :string
     end
   end
 end
diff --git a/db/schema.rb b/db/schema.rb
index 5066c9ae0..72534b28e 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -78,7 +78,7 @@ ActiveRecord::Schema.define(version: 2021_11_03_090530) do
     t.string "property_relet"
     t.integer "rsnvac"
     t.string "property_reference"
-    t.string "unittype_gn"
+    t.integer "unittype_gn"
     t.string "property_building_type"
     t.string "beds"
     t.string "property_void_date"