diff --git a/migrations/0xx.construction.down.sql b/migrations/0xx.construction.down.sql
new file mode 100644
index 00000000..adee9941
--- /dev/null
+++ b/migrations/0xx.construction.down.sql
@@ -0,0 +1,23 @@
+--NOTE Some construction category fields (insulation and glazing) are migrated in sustainability.up.1-extra see #405
+--Primary material (brick/clay tile, slate, steel/metal, timber, stone, glass, concrete, natural-green or thatch, asphalt or other)
+ALTER TABLE buildings DROP COLUMN IF EXISTS constrctn_primary_mat;
+
+--Secondary material
+ALTER TABLE buildings DROP COLUMN IF EXISTS constrctn_secondary_mat;
+
+--Primary roof material
+ALTER TABLE buildings DROP COLUMN IF EXISTS constrctn_primary_roof_mat;
+
+--Secondary roof material
+ALTER TABLE buildings DROP COLUMN IF EXISTS constrctn_secondary_roof_mat;
+
+--Has building been extended y/n
+ALTER TABLE buildings DROP COLUMN IF EXISTS constrctn_extension;
+
+--What kind of extensions (side, rear, loft, basement)
+ALTER TABLE buildings DROP COLUMN IF EXISTS constrctn_extension_type;
+
+--Glazing type, what is most common glazing type. (unless I add into sustainability for now)
+ALTER TABLE buildings DROP COLUMN IF EXISTS constrctn_glazing_type;
+
+--Also pick up roof in this for