State Code for Mobile/Manufactured Home Installation

Q: What does the state code for installing mobile/ manufactured homes require?

A: WAC 296-150I, Sections 0310 through 0370, states the requirements for installing homes in Washington.  Anyone installing a home in Washington State must follow the requirements of the WAC.

• New Homes: Must be installed according to the home manufacturer’s instructions or the specific instructions of an engineer or architect licensed in this state. Specific instructions of an engineer or architect need not address the entire installation. The manufacturer’s installation instructions would be used for other installation aspects.
• Relocated Homes: If the home manufacturer’s original installation instructions are unavailable, relocated homes may be installed according to the specifications of the American National Standard Institute (ANSI) A225.1 or the specific instructions of an engineer or architect licensed in Washington State. For information on where to obtain a copy of ANSI A225.1, contact the Department of Labor and Industries, Factory Assembled Structures, toll-free automated services line at 1-800-647-0982 (Option 5).

Q: Where can I find a complete list of the installation requirements of WAC 296-150I?

A: You can access the complete WAC 296-150I here. Additional copies can be obtained by contacting the Department of Labor and Industries, Factory Assembled Structures, toll-free automated services line at 800-647-0982 (Option 5).

For more information:

RCW 43.22 Sections 335-495 - Manufactured/mobile homes, factory-assembled structures
RCW 43.22A - Installer Certification.
WAC 296-150I - Installer Practices.
WAC 296-150M - WA Installation Code.