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
- 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)
- RCW 43.22 - Department of Labor & Industries.
- RCW 43.22A – Mobile and Manufactured Home Installation.
Code of federal regulations
Washington Administrative Code (WAC)
- 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.
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
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.
2025 Rulemaking
L&I is proposing a 6.51% fee increase for services from the Contractor Registration, Electrical, Elevator, Factory Assembled Structures (FAS), and Plumber programs.
The agency filed a CR-102 Proposed Rulemaking on Feb. 3. The fee increase represents the maximum allowable increase based on the average personal income growth over the past decade This rulemaking also proposes housekeeping changes to add an additional $.10 to correct an error from previous fee increase rulemaking to the Master electrician and journey level, specialty or reciprocal electrician exam applications nonrefundable fee.
The fee increase would affect the following Washington Administrative Codes (WACs):
WAC 296-46B-906, Inspection Fees.
WAC 296-46B-909, Electrical/telecommunications contractor's license, administrator certificate and examination, master electrician certificate and examination, electrician certificate and examination, copy, and miscellaneous fees.
WAC 296-46B-911, Electrical testing laboratory and engineer accreditation fees.
WAC 296-96-00922, Licensing fees.
WAC 296-96-01085, Permit and inspection fees;
WAC 296-150C-3000, Commercial coach fees;
WAC 296-150F-3000, Factory-built housing and commercial structure fees;
WAC 296-150I-3000, Penalties, fees, and refunds;
WAC 296-150M-3000, Manufactured/mobile home fees;
WAC 296-150P-3000, Recreational park trailer fees;
WAC 296-150R-3000, Recreational vehicle fees;
WAC 296-150T-3000, Factory-built temporary worker housing fees; and
WAC 296-150V-3000, Conversion vendor units and medical units – Fees.
WAC 296-200A-900, What fees does the department charge contractors for issuance, renewal, reregistration, and reinstatement of certificates of registration?
WAC 296-400A-045, What fees does the department charge for issuance, renewal, relicensing, and reinstatement of a plumbing contractor license and plumbing certificates?
If adopted, the fee increase would take effect July 1.
How to participate
A public hearing on the proposed rules will take place March 12, 2026, starting at 9 a.m. at L&I headquarters, 7273 Linderson Way S.W., Tumwater, WA.
Besides participating in person, you can join the meeting using:
Zoom Meeting:
Click here to join the meeting:
https://lni-wa-gov.zoom.us/j/83817092455?pwd=0tbjsHVTBS4TSV59JcL1xoIB1scWhD.1
Passcode: J^7TYS7*
Or calling:
1-253-215-8782
Meeting ID: 838 1709 2455
Passcode: 96881303
You can provide testimony or written comments at the above hearing, or send written comments by 5 p.m. on March 12, 2026, to:
- Meagan Edwards
- Email: CSCPSRules@Lni.wa.gov
- Mail: Department of Labor & Industries, Field Services & Public Safety Division, PO Box 44400, Olympia, WA 98504-4400
If you require communication or accommodation arrangements, please contact Meagan Edwards at 360-522-0125, by Feb. 26.
Rulemaking documents
Notice of Intent
Proposed Rule Language (02/03/2026)
Here's what happens next:
- March 12: A public hearing on the proposed rules is scheduled for 9 a.m.
- May 5: The final rules (CR-103) are expected to be filed with the state Office of the Code Reviser.
- July 1: The new rules are expected to take effect.
For more information
- All FAS Program rulemaking.
- Overview of the L&I rulemaking process.
- A glossary of terms can help in understanding the rulemaking/code adoption process.
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