Laws, Rules, and Policies

This is your gateway to the laws, rules, rule development, and policies for L&I’s program that oversees manufactured and mobile homes, food trucks, and other mobile or modular structures. Here you can see applicable laws and rules, see what new rules are in development and get involved with the rulemaking process, and see information on any policies the program develops.

If you have a question about a rule, law or policy, send an email to

Laws & Rules

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

Laws for those areas are located in chapters 43.22 and 43.22A of the Revised Code of Washington (RCW).

Rules that enact the laws in the program area can be found in Washington Administration Code (WAC) chapter 296-150C, 296-150F, 296-150I, 296-150M, 296-150P, 296-150R, 296-150T, 296-150V and 296-49A.

The RCW and WAC are maintained and updated by the State Office of the Code Reviser (

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 (

2018 Rulemaking – Fee Increase

FAS Rule Development
The Washington State Department of Labor & Industries is proposing fee increases for the Contractor Registration, Elevator, and Factory Assembled Structures (FAS) programs.

This includes:

  • Chapter 296-200A WAC.
  • Chapter 296-96 WAC.
  • Chapter 296-150C WAC.
  • Chapter 296-150F WAC.
  • Chapter 296-150I WAC.
  • Chapter 296-150M WAC.
  • Chapter 296-150P WAC.
  • Chapter 296-150R WAC.
  • Chapter 296-150T WAC and,
  • Chapter 296-150V WAC.

The proposed changes would increase fees by the fiscal-growth factor rate of 4.0 percent. This is the maximum increase allowed under the state Office of Financial Management. A fee increase is needed to cover operating expenses for inspections and other program public safety activities.

The following are the rulemaking documents:

Here's what happens next:

  • October 23, 2018: Proposed rules (CR-102) filed with the Code Reviser's Office.
  • November 27, 2018: Public hearing on the proposed rules.
  • November 27, 2018: Written comment period on the proposed rules ends.
  • November 2018: Expected filing of final rules (CR-103) with the Code Reviser's Office.
  • January 2019: Expected effective date of the rules.

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.


Revised Code of Washington (RCW)

Code of Federal Regulations

Rules and Policies

Washington Administrative Code (WACs)

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

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