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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

The agency proposes a change to the Washington Administrative Code (WAC) that would allow for inspection and approval of manufactured building panels prior to shipment to a construction site within the state. The changes would affect Chapter 296-150F WAC Factory-Built Housing and Commercial Structures. L&I is also making updates, clarifications, and housekeeping changes.

The following are the rulemaking documents:

Pre-proposal (CR-101)

Here's what happens next:

  • March 5: A "pre-proposal" is filed with the state Code Reviser's Office.
  • June 4: The proposed rule is expected to be filed with the state Code Reviser's Office.
  • July 11: A public hearing on the proposed rules is tentatively scheduled.
  • Sept. 17: The final rule is expected to be filed with the state Code Reviser's Office.
  • Dec. 1: 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).

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