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WashingtonSB 55522025-2026 Regular SessionSenate

Concerning the creation of building codes for kit homes.

Sponsored By: Jeff Wilson (Republican)

Signed by Governor

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Bill Overview

Analyzed Economic Effects

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

New building code process for kit homes

Beginning June 11, 2026, Washington law creates a building-code category for kit homes of 800 square feet or less. These homes use prefabricated walls, floors, and roofs assembled on-site. The State Building Code Council must conduct rulemaking for these homes by March 31, 2027. The council can update the codes afterward. The law does not set the final building requirements or say how they will affect construction costs.

Sponsors & Cosponsors

Sponsor

  • Jeff Wilson

    Republican • Senate

Cosponsors

  • Adrian Cortes

    Democratic • Senate

  • Bill Ramos

    Democratic • Senate

  • Chris Gildon

    Republican • Senate

  • Claire Wilson

    Democratic • Senate

  • Deborah Krishnadasan

    Democratic • Senate

  • Jeff Holy

    Republican • Senate

  • Jim McCune

    Republican • Senate

  • John Braun

    Republican • Senate

  • Judy Warnick

    Republican • Senate

  • Keith Goehner

    Republican • Senate

  • Leonard Christian

    Republican • Senate

  • Marko Liias

    Democratic • Senate

  • Mike Chapman

    Democratic • Senate

  • Noel Frame

    Democratic • Senate

  • Perry Dozier

    Republican • Senate

  • Phil Fortunato

    Republican • Senate

  • Sharon Shewmake

    Democratic • Senate

  • Shelly Short

    Republican • Senate

  • T'wina Nobles

    Democratic • Senate

  • Vandana Slatter

    Democratic • Senate

Roll Call Votes

All Roll Calls

Yes: 191 • No: 0

House vote • 3/3/2026

3rd Reading & Final Passage

Yes: 93 • No: 0 • Other: 5

Senate vote • 1/21/2026

3rd Reading & Final Passage

Yes: 49 • No: 0

Senate vote • 3/4/2025

3rd Reading & Final Passage

Yes: 49 • No: 0

Actions Timeline

  1. Effective date 6/11/2026.

    3/14/2026Senate

  2. Chapter 41, 2026 Laws.

    3/14/2026Senate

  3. Governor signed.

    3/14/2026legislature

  4. Delivered to Governor.

    3/9/2026legislature

  5. Speaker signed.

    3/5/2026legislature

  6. President signed.

    3/4/2026legislature

  7. Third reading, passed; yeas, 93; nays, 0; absent, 0; excused, 5.

    3/3/2026Senate

  8. Rules suspended. Placed on Third Reading.

    3/3/2026Senate

  9. Rules Committee relieved of further consideration. Placed on second reading.

    2/25/2026Senate

  10. Referred to Rules 2 Review.

    2/23/2026Senate

  11. LG - Executive action taken by committee.

    2/20/2026Senate

  12. LG - Majority; do pass.

    2/20/2026Senate

  13. First reading, referred to Local Government.

    1/26/2026Senate

  14. Third reading, passed; yeas, 49; nays, 0; absent, 0; excused, 0.

    1/21/2026Senate

  15. Rules suspended. Placed on Third Reading.

    1/21/2026Senate

  16. Floor amendment(s) adopted.

    1/21/2026Senate

  17. Returned to second reading for amendment.

    1/21/2026Senate

  18. Rules suspended.

    1/21/2026Senate

  19. Placed on third reading by Rules Committee.

    1/13/2026Senate

  20. By resolution, reintroduced and retained in present status.

    1/12/2026Senate

  21. By resolution, returned to Senate Rules Committee for third reading.

    4/27/2025Senate

  22. Referred to Rules 2 Review.

    4/2/2025Senate

  23. LG - Majority; do pass with amendment(s).

    4/1/2025Senate

  24. LG - Executive action taken by committee.

    4/1/2025Senate

  25. First reading, referred to Local Government.

    3/6/2025Senate

Bill Text

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