WAC 296-150C-0300. When is design-plan approval required?

Design plans for commercial coaches are required for units that are sold, leased, or used in Washington state and must be approved when: (1) You build a new unit; (2) You modify an approved design plan through addendums; (3) You add options to an approved design plan through addendums; or (4) You change the occupancy classification of the building.