diff --git a/migrations/011.sustainability.down.sql b/migrations/011.sustainability.down.sql
index 8cdf14eb..a1279e3e 100644
--- a/migrations/011.sustainability.down.sql
+++ b/migrations/011.sustainability.down.sql
@@ -26,3 +26,8 @@ ALTER TABLE buildings DROP COLUMN IF EXISTS sust_life_expectancy;
 
 --Average lifespan of typology based on statistical analysis of similar stock
 ALTER TABLE buildings DROP COLUMN IF EXISTS sust_lifespan_average;
+
+
+DROP TYPE IF EXISTS sust_breeam_rating;
+DROP TYPE IF EXISTS sust_dec;
+DROP TYPE IF EXISTS sust_aggregate_estimate_epc;
diff --git a/migrations/011.sustainability.up.sql b/migrations/011.sustainability.up.sql
index 854d61f2..500fe728 100644
--- a/migrations/011.sustainability.up.sql
+++ b/migrations/011.sustainability.up.sql
@@ -14,7 +14,7 @@ AS ENUM ('Outstanding',
     'Unclassified');
 
 ALTER TABLE buildings
-    ADD COLUMN IF NOT EXISTS sust_breeam_rating sust_breeam_rating DEFAULT 'Unclassified';
+    ADD COLUMN IF NOT EXISTS sust_breeam_rating sust_breeam_rating;
 
 -- Date of BREEAM
 ALTER TABLE buildings
diff --git a/migrations/012.type.down.sql b/migrations/012.type.down.sql
index 414d04b0..60578f6f 100644
--- a/migrations/012.type.down.sql
+++ b/migrations/012.type.down.sql
@@ -4,3 +4,5 @@ ALTER TABLE buildings DROP COLUMN IF EXISTS building_attachment_form;
 -- [Disabled for launch] Date of change of use
 -- This needs to pair with demolition 
 ALTER TABLE buildings DROP COLUMN IF EXISTS date_change_building_use;
+
+DROP TYPE IF EXISTS building_attachment_form;
diff --git a/migrations/012.type.up.sql b/migrations/012.type.up.sql
index f925dedf..50268408 100644
--- a/migrations/012.type.up.sql
+++ b/migrations/012.type.up.sql
@@ -3,11 +3,10 @@ CREATE TYPE building_attachment_form
 AS ENUM ('Detached',
     'Semi-Detached',
     'End-Terrace',
-    'Mid-Terrace',
-    'Unknown');
+    'Mid-Terrace');
 
 ALTER TABLE buildings
-    ADD COLUMN IF NOT EXISTS building_attachment_form building_attachment_form DEFAULT 'Unknown';
+    ADD COLUMN IF NOT EXISTS building_attachment_form building_attachment_form;
 
 -- [Disabled for launch] Date of change of use
 -- This needs to pair with demolition