Laws & Rules

This is your gateway to the laws, existing 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, email us at 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.

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.

For more information

Laws

Revised Code of Washington (RCW)
Code of federal regulations
Washington Administrative Code (WAC)

Contact us 

FAS1@lni.wa.gov
1-800-705-1411 Option 3

Mailing address
Washington State Department of Labor & Industries
PO Box 44430
Olympia WA 98504-4430

Location
7273 Linderson Way SW
Tumwater WA 98501

Rule Development

When L&I officially announces a rule, it does so under law through permanent rulemaking, expedited rulemaking or emergency rulemaking changes to the Washington Administrative Code (WAC). Learn more about the rulemaking process and common rulemaking terms.

2022 Fee Increase

L&I is proposing a 5.86% fee increase for permits, inspections, and other services for the Factory Assembled Structures Program. A fee increase is needed to cover increased operating costs.

L&I is also proposing a housekeeping change to make a typo correction.

The proposed rules (CR-102) were filed with the state Office of the Code Reviser on June 21.


Here’s what happens next

  • July 27: A public hearing on the proposed rules is scheduled for 9 a.m. You can join by either:
    • Your computer or mobile app (Microsoft Teams)
      Click here to join the meeting
    • Or call (audio only)
      1-253-372-2181, Phone Conference ID: 572 550 411#

      You can send written comments by 5 p.m. Send by email to: Alicia.Curry@Lni.wa.gov, or by mail to: Attn: Alicia Curry, Department of Labor & Industries, Field Services & Public Safety Division, PO Box 44400, Olympia, WA 98504-4400, or by fax to: 360-902-5292.
  • Sept. 20: The final rules (CR-103) are expected to be filed with the state Office of the Code Reviser.
  • Nov. 1: The new rules are expected to take effect.

What’s included
The fee increase would affect:

Rulemaking Documents
CR-101 Preproposal
CR-102 Proposed Rulemaking
CR-102 Proposed Language
Public Hearing Information Packet

2022 emergency rulemaking
plan review by licensed professionals

Last year, L&I adopted an emergency rule to speed plan review for modular buildings, among other structures and extended the rule on April 19. On August 16,  L&I filed another extension of that rule, which allows the use of licensed professionals in areas where L&I’s Factory Assembled Structures Program (FAS) requires plan review.

The 120-day extension allows more time for the FAS Program to address the backlog of more than 900 design plans that still exists while developing permanent rules. 

The emergency rule also clarifies what a design plan submission must include and how to submit design plans for approval for commercial coaches and factory-built housing and commercial structures.

 The "emergency rulemaking process" may be used when a rule is needed before the standard rulemaking process can be completed.

The changes affect rules under:

In all, the emergency changes allow for review and approval of design plans for recreational park trailers, recreational vehicles, and conversion vendor units by a licensed professional engineer, architect, or firm. The changes also clarify what a design plan submission must include and how to submit design plans for approval for commercial coaches and factory-built housing and commercial structures.

Unless extended, the emergency rule expires on December 14, 2022.

For more information about the process for design plans by licensed professionals, visit the "Modular & Other Structures" page on the FAS website.

Rulemaking Documents

2022 Rulemaking
Plan review by licensed professionals

L&I is considering changes that will modify rules for design plan reviews by licensed professional engineers, architects, and firms for commercial coach trailers, factory-built housing and commercial structures, recreational park trailers, recreational vehicles, and conversion vendor units (food trucks and trailers).

 L&I filed emergency rules to address a backlog of design plans in the Factory Assembled Structures Program (FAS) (see above). This rulemaking considers the adoption of permanent rules.

L&I filed a Preproposal Statement of Inquiry (CR-101) on August 16. 

The changes affect rules under:

Rulemaking Documents

 Here’s what happens next

  • November 1: The proposed rules (CR-102) are expected to be filed with the state Office of the Code Reviser.
  • December: A public hearing on the proposed rules is tentatively scheduled.
  • January 31, 2023: The final rules (CR-103) are expected to be filed with the state Office of the Code Reviser.
  • March 3, 2023: The new rules are expected to take effect.

Rulemaking for new legislation 

During the 2019 legislative session, the state 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.

During the 2019 legislative session, L&I separately filed a preproposal statement of inquiry (called a CR-101) (WSR 19-06-069, filed March 5, 2019). The preproposal 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. The agency instead has filed a new preproposal to consider changes to WAC chapter 296-150F 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

For more information

Contact us 

FAS1@lni.wa.gov
1-800-705-1411 Option 3

Mailing address
Washington State Department of Labor & Industries
PO Box 44430
Olympia WA 98504-4430

Location
7273 Linderson Way SW
Tumwater WA 98501