PDFWAC 296-150F-0300
When is design plan approval required?
Design plans for factory-built housing and commercial structures prior to installation at the building site in Washington must be approved when:
(1) You build a new unit;
(2) You modify an approved design plan through an addendum; or
(3) You add options to an approved design plan through an addendum.
[Statutory Authority: RCW 43.22.340, [43.22.]355, [43.22.]360, [43.22.]432, [43.22.]440 and [43.22.]480. WSR 96-21-146, ยง 296-150F-0300, filed 10/23/96, effective 11/25/96.]