WashingtonHB 21512025-2026 Regular SessionHouse

Adopting national standards for factory built housing and commercial structures.

Sponsored By: Deb Manjarrez (Republican)

Signed by Governor

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Bill Overview

Analyzed Economic Effects

3 provisions identified: 2 benefits, 0 costs, 1 mixed.

Utility enclosures skip state approval

Beginning June 11, 2026, qualifying prefabricated utility enclosures do not need Labor and Industries factory-built structure approval. They must house energy storage or electrical equipment serving energy generation, control, transformation, transmission, or distribution. The energy installation must be owned and exclusively controlled by an electric utility through an established right. Only qualified service personnel may enter for maintenance, repairs, or occasional monitoring. The enclosure cannot be occupied for another purpose.

Factory-built buildings gain more inspection options

Beginning June 11, 2026, state rules must allow approved nongovernment agencies to inspect factory-built homes and commercial buildings. Labor and Industries can also delegate some or all inspection duties to local building enforcement agencies. Approved inspection agencies must be competent, objective, independent of the company being inspected, and disclose conflicts of interest. They need adequate equipment and staff with appropriate knowledge and certifications; International Code Council certification meets the staff-certification requirement. The director can also adopt rules allowing approval of professionally certified plans that meet Washington requirements or equivalent standards. The certifying professional must be licensed or certified in a state whose licensing requirements meet or exceed Washington's.

Factory-built tiny homes face approval rules

Beginning June 11, 2026, Washington includes qualifying factory-built tiny houses in its factory-built housing rules, with or without a chassis. A home, or a room in it, must be built entirely or mostly off-site for human occupancy. Manufactured and mobile homes are excluded. Covered homes and commercial buildings need Labor and Industries approval labels before installation once the department's regulations take effect. These labels establish compliance with applicable local manufacturing and construction laws; changes before or during installation need department approval. The department must require sound structures and reasonably safe plumbing, heating, electrical systems, and other parts. Its rules must consider national off-site construction and inspection standards where practical, along with building, plumbing, mechanical, accessibility, energy, electrical, and applicable temporary-worker codes. The department sets fees to cover administration and enforcement costs. During a state emergency, the governor can waive or suspend fees and issue orders supporting operations and safety.

Sponsors & Cosponsors

Sponsor

Deb Manjarrez
Republican • House

Cosponsors

Alex Ramel
Democratic • House
Beth Doglio
Democratic • House
Brandy Donaghy
Democratic • House
Brianna Thomas
Democratic • House
Cindy Ryu
Democratic • House
Davina Duerr
Democratic • House
Janice Zahn
Democratic • House
Jenny Graham
Republican • House
Mia Gregerson
Democratic • House
Sam Low
Republican • House
Sharon Wylie
Democratic • House
Strom Peterson
Democratic • House
Timm Ormsby
Democratic • House

Roll Call Votes

All Roll Calls

Yes: 144 • No: 0

Senate vote • 2/28/2026

3rd Reading & Final Passage

Yes: 49 • No: 0

House vote • 2/11/2026