SB 5552 Washington Senate · 2025-2026 Regular Session

Concerning the creation of building codes for kit homes.

SB 5552 aims to create a new category of building codes specifically for "kit homes" to increase affordable housing options. The bill defines kit homes as residential structures 800 square feet or smaller, built from prefabricated walls, floors, and roofs assembled on-site. It directs the State Building Code Council to establish these specific building codes for kit homes by December 31, 2025. This initiative is intended to provide more affordable small homes for homebuyers of modest means.

Issues: ✓ Housing

Bill status signed all 5 stages cleared

Introduction

Jan 2026

Committee Review

Feb 2026

Senate Passage

Mar 2026

House Passage

Mar 2026

Signed into Law

Mar 2026

Introduced Jan 12, 2026 Signed Mar 14, 2026

Maddy AI version diff · 3 comparisons

What changed between versions

Engrossed Substitute Bill → Substitute Passed Legislature · 3 edits

MINOR

The document has been updated from a draft version to the final certified version passed by the legislature. The session year was corrected from 2025 to 2026 to match the actual legislative session, and the text now includes official certification signatures and enrollment details confirming the bill's passage.

TIMELINE

The legislative session year was updated from 2025 to 2026 to reflect the correct session in which the bill was passed.

TECHNICAL

Added a formal Certification of Enrollment section with signatures from the Secretary of the Senate and Secretary of State to officially certify the bill's passage.

Included vote counts (Yeas and Nays) for both the Senate and House to document the final approval margins.

Floor votes · Senate Jan 21, 2026 · House Mar 3, 2026

How they voted

51–0

Passed

Total votes 51

Jan 21, 2026

D Democratic31

31 Yea

100% Yea

R Republican20

20 Yea

100% Yea

Vote distribution

All Yea All Nay Mixed No data

Full legislative history

Actions timeline

Total actions

Key actions

Committee

Mar 14, 2026

Signed into law

Governor signed.

executive

Mar 5, 2026

Lower · Passed

Speaker signed.

lower

Mar 4, 2026

Upper · Passed

President signed.

upper

Mar 3, 2026

House · Passed

House Vote: pass (95-0-5)

house

Feb 23, 2026

Committee

Referred to Rules 2 Review.

lower

Feb 20, 2026

Lower · Passed

LG - Majority; do pass.

lower

Feb 20, 2026

Lower · Passed

Executive action taken in the House Committee on Local Government at 10:30 AM.

lower

Feb 18, 2026

Lower · Passed

Public hearing in the House Committee on Local Government at 8:30 AM.

lower

Jan 21, 2026

Upper · Passed

Floor amendment(s) adopted.

upper

Jan 12, 2026

Introduced

By resolution, reintroduced and retained in present status.

upper

Apr 2, 2025

Committee

Referred to Rules 2 Review.

lower

Apr 1, 2025

Lower · Passed

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

lower

Apr 1, 2025

Lower · Passed

Executive action taken in the House Committee on Local Government at 11:00 AM.

lower

Mar 26, 2025

Lower · Passed

Public hearing in the House Committee on Local Government at 8:00 AM.

lower

Feb 20, 2025

Upper · Passed

Executive action taken in the Senate Committee on Local Government at 1:30 PM.

upper

Feb 6, 2025

Upper · Passed

Public hearing in the Senate Committee on Local Government at 1:30 PM.

upper

1 primary · 20 co-sponsors