Adjacent structures such as, but not limited to, additions, decks, porches, and awnings should be self-supporting, unless the manufacturer has designed the manufactured home to support an "attached accessory building or structure" as indicated on the HUD data plate posted in the home.

(1) Local enforcement agency jurisdiction.

(a) Adjacent self-supporting structures that do not use any of the systems in the manufactured home are under the authority of the local enforcement agency for all permitting, review and inspections.

Adjacent self-supporting structures may be attached and flashed to the manufactured home and do not require an L&I permit.

(b) Accessory structure ready homes:

(i) When a manufactured home is designed to support an "attached accessory building or structure," typically a garage or carport, the manufacturer's installation instructions will address the requirements for fire separation, protection of openings, duct penetrations, allowable loads, attachment points, support and anchorage requirements. The garage or carport may be either site built or built in the factory. The design and construction of a site built accessory structure is subject to regulation by the local enforcement agency.

(ii) Extension of one or more of the systems of the manufactured home, and other alterations to the home not covered by the installation instructions require a permit and inspection by the department in accordance with chapter 296-150M WAC.

(2) Department of labor and industries jurisdiction.

Adjacent structures that are supported by the manufactured home, use one or more of the systems of the manufactured home, or have other structural alterations to the home, require a permit and inspection by the department in accordance with chapter 296-150M WAC. They may also require permits, review and inspection by the local enforcement agency.