Factory-Assembled Structures

The Washington Administrative Code (WAC) or Revised Code of Washington (RCW) are maintained and updated by the State Office of the Code Reviser (slc.leg.wa.gov).

If you receive an error message when referencing a link to a specific section of a WAC or RCW, try your search at the Washington State Legislative Search page (search.leg.wa.gov).

2015 FAS Rule Development

The Factory Assembled Structures (FAS) program is planning amendments to sections of Chapter 296-150M WAC for manufactured homes. The program reviews the rules on a regular basis to ensure consistency with federal and national safety code requirements and industry standards, to clarify the existing rules, perform housekeeping, etc.

The following is draft language of proposed rule changes: Chapter 296-150M WAC Draft Language (218 KB PDF).

If you have any preliminary input on the proposed rules, please send to Alicia Curry at Alicia.Curry@Lni.wa.gov. You will also have the opportunity to provide your formal comments after the rule notice has been filed during the public comment period.  We would appreciate your preliminary comments by Monday, August 17, 2015.


July 21, 2015 Preproposal (CR-101) (128 KB PDF)
September 2015 Proposed Rule-Making (CR-102)
October 2015 Public Hearing at Tumwater L&I Office at 9 a.m.
(Comments due by 5 p.m.)
November 2015 Adoption (Rule-Making Order CR-103)


The tentative effective date of the rules is January 1, 2016.

The FAS Advisory Committee members will meet to review the proposed rules and provide advice to L&I on August 20, 2015, at 1 p.m. in the L&I Tumwater building, Room S129.


Revised Code of Washington (RCW)

Code of Federal Regulations


Washington Administrative Code (WACs)

  • Commercial Coaches - WAC 296-150C (app.leg.wa.gov).
  • Factory-Built Housing and Commercial Structures - WAC 296-150F (app.leg.wa.gov).
  • Manufactured Homes - WAC 296-150M (app.leg.wa.gov).
  • Manuafactured Home Installer Certification – WAC 296-150I (app.leg.wa.gov).
  • Recreational Park Trailers - WAC 296-150P (app.leg.wa.gov).
  • Recreational Vehicles - WAC 296-150R (app.leg.wa.gov).
  • Factory Built Temporary Worker Housing Structures - WAC 296-150T (app.leg.wa.gov).
  • Concession Units and Medical Units -  WAC 296-150V (app.leg.wa.gov).
  • Temporary Worker Housing Construction Standard - WAC 246-359 (app.leg.wa.gov).

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