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Manufactured/Mobile home installers must be certified

Washington law requires a certified manufactured home installer to be on site to supervise all phases of manufactured home installation work.

• What is manufactured/mobile home installation work?

  According to Washington law (RCW 43.22A /WAC 296-150I), installation work means:

  • Set-up and assembly.
  • Constructing the foundation system, including building the forms for concrete.
  • Installing the support piers.
  • Connecting to the foundation system and support piers.
  • Skirting (decorative or load-bearing).
  • Shipped-loose plumbing connections.*
  • On-site work such as complete re-leveling, skirting replacement, and installing earthquake-resistant bracing systems.**
  • Extension of the water heater pressure relief valve.

  * Washington State certified plumbers are not required to obtain installer certification to perform plumbing work on manufactured homes.
  ** Work such as routine maintenance or other routine repairs such as periodic adjustments to piers, replacement of a damaged pier, or skirting repair does not require manufactured home installer certification.

The Installer Certification Process

To become a certified manufactured home installer in the state of Washington you must:

1. Meet the experience requirements.
2. Submit an application and pay the fee to take the training and certification examination.
3. Take the 10-hour training course.
4. Pass the certification examination.
5. Take continuing education required for renewal.
6. Installer certification must be renewed after three years.

Experience Requirements

To qualify for certification:

• You must have at least six months of hands-on experience installing manufactured homes under the direct supervision of a certified installer,
  OR
• You must have two years of hands-on experience with residential or commercial construction.

Important note

To do business as a mobile/manufactured home installer in Washington, you may also need the following:

• Registration as a contractor with L&I.
• State business license - Go to Learn About Doing Business in Washington.
• Local business license - Contact your county or city.

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.