Laws, Rules, and Policies

This is your gateway to the laws, exisiting rules, rules in development, and policies for L&I’s program regulating manufactured and mobile homes, food trucks, and other mobile or modular structures. Here you can learn about:

  • Applicable laws and rules
  • New rules being developed
  • How to get involved with the rulemaking process
  • New policies the program develops.

If you have a question about a rule, law or policy, send an email to FAS1@Lni.wa.gov.

Laws & Rules

The state Legislature enacts laws regulating manufactured and mobile homes, food trucks, and other mobile or modular structures.

These laws are in chapters 43.22 and 43.22A of the Revised Code of Washington (RCW).

Agencies adopt rules to implement laws. Rules implementing the laws in chapter 43.22 and 43.22(a) are codified in the Washington Administrative Code (WAC) at Title 296-Chapter 49A, and 150C, 150F, 150I, 150M, 150P, 150R, 150T, and 150V.

The RCW and WAC 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).

2019 Rulemaking

L&I is considering changes to the FAS rules that apply to manufactured homes.

The changes under consideration will require certified installers and contractors to:

  • Approve the installation of new manufactured homes performed by homeowners.
  • Verify and acknowledge site preparations for new manufactured homes.
  • Obtain factory approval for alterations to new manufactured homes.

The changes under consideration will also replace the ANSI 225.1 standard for Manufactured Home Installations with the US Department of Housing and Urban Development (HUD) regulations for Manufactured Home Installations.

L&I is also considering updating, clarifying, and making housekeeping changes to rules in Chapter 296-150I Washington Administrative Code (WAC). The rule changes would affect:

  • Chapter 296-150I WAC Factory-Built Housing and Commercial Structures Manufactured Home Installer Training and Certification Program; and
  • Chapter 296-150M WAC Manufactured Homes.

In 2017, HUD reviewed L&I's rules and standards for manufactured housing installations to ensure the program's compliance with federal regulations. This rulemaking addresses HUD's findings that require revisions to the rules for L&I to meets its contractual obligations and be fully compliant with HUD regulations.

Rulemaking Documents:

Preproposal (CR-101)

Here's what happens next:

  • Aug. 20: A pre-proposal was filed with the state Code Reviser's Office.
  • Dec. 17: The proposed rules are expected to be filed with the state Code Reviser's Office.
  • Jan. 23, 2020: A public hearing on the proposed rules is tentatively scheduled.
  • Mar. 17, 2020: The final rules are expected to be filed with the state Code Reviser's Office.
  • Apr. 17, 2020: The new rules are expected to take effect.

2019 Rulemaking

During the 2019 legislative session, the legislature enacted laws affecting factory assembled structures.  The changes included:   

  • Requirements for energy efficiency
  • Delegation of inspection duties
  • Tiny houses

These changes require L&I to engage in rulemaking.

While the legislative session was ongoing, L&I separately filed a preproposal statement of inquiry (CR-101) (WSR 19-06-069, filed March 5, 2019) that would have adopted rules allowing for inspection and approval of manufactured building panels prior to shipment to a construction site within the state. The preproposal would also have made updates, clarifications, and housekeeping changes.

Instead of conducting two separate rulemakings-one to address legislative changes and one to consider a new rule, L&I has determined it is a better use of agency resources to consolidate all of the required changes into one rulemaking.

As a matter of procedure, the agency has withdrawn the preproposal (WSR 19-06-069) and has filed a new preproposal to consider changes to chapter 296-150F WAC related to:

  • Requirements for energy efficiency
  • Delegation of inspection duties
  • Tiny houses
  • Inspection and approval of manufactured building panels prior to shipment to a construction site within the state
  • Updates, clarifications, and housekeeping changes

Rulemaking documents

Pre-proposal (CR-101)

Here's what happens next:

  • July 2: A pre-proposal was filed with the state Code Reviser's Office.
  • Nov. 19: The proposed rules are expected to be filed with the state Code Reviser's Office.
  • Jan. 13: A public hearing on the proposed rules is tentatively scheduled.
  • Feb. 18: The final rules are expected to be filed with the state Code Reviser's Office.
  • March. 20: The new rules are expected to take effect.

For more information

Get an overview of the L&I rulemaking process. A glossary of terms can help in understanding the rulemaking/code adoption process.

Laws

Revised Code of Washington (RCW)

Code of Federal Regulations

Rules

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).
  • Manufactured 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).

End of main content, page footer follows.

Access Washington official state portal

   © Washington State Dept. of Labor & Industries. Use of this site is subject to the laws of the state of Washington.

Help us improve