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.
• When an aspect of the installation is not covered by either the manufacturer's installation instructions or the instructions of a licensed engineer or architect, the installation shall comply with the requirements of WAC 296-150I-0310.
• 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 & 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 & 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 - Mobile and Manufactured Home Installation
WAC 296-150I - Manufactured Home Installer Training and Certification Program, Installation Code.
WAC 296-150M - WA Manufactured Home Code.