Concerning building code and development regulation reform.
HB 1183 reforms building codes and development regulations for cities and counties in Washington to encourage affordable and sustainable building practices. The bill mandates that cities allow for increased housing density, reduced parking requirements, and streamlined permitting when adding residential units within existing commercial or mixed-use buildings. It also provides flexibility in setback and roof height rules for existing buildings undergoing residential retrofits and for new construction or retrofits meeting "passive house" energy efficiency standards. These changes aim to reduce regulatory barriers for converting existing structures into homes and promote energy-efficient construction.
Bill status
signed
all 5 stages cleared
Introduction
Jan 2025
Committee Review
Apr 2025
House Passage
Apr 2025
Senate Passage
Apr 2025
Signed into Law
Apr 2025
Introduced Jan 7, 2025
Signed Apr 22, 2025
Maddy AI version diff · 3 comparisons
What changed between versions
Second Substitute Bill
→
Second Substitute Passed Legislature
·
3 edits
MINOR
The document was converted from a draft bill version to an official certification of enrollment, confirming that the bill has been passed by both the House and Senate. This change transforms the text from a proposal into a legally certified record of legislative approval.
TECHNICAL
Added certification text confirming the bill passed the House and Senate with specific vote counts and dates.
Removed the draft bill number (H-1728.1) and replaced it with the official certification header.
Changed the document title from 'Second Substitute House Bill 1183' to 'CERTIFICATION OF ENROLLMENT' to reflect its new status as an official record.
Floor votes · Senate Apr 14, 2025 · House Mar 11, 2025
How they voted
30–21
Passed
Total votes 51
Apr 14, 2025
D
Democratic31
93% Yea
R
Republican20
95% Nay
Vote distribution
All Yea
All Nay
Mixed
No data
Full legislative history
Actions timeline
Total actions
41
Key actions
21
Committee
20
Apr 22, 2025
Signed into law
Governor signed.
executive
Apr 16, 2025
Upper · Passed
President signed.
upper
Apr 15, 2025
Lower · Passed
Speaker signed.
lower
Apr 14, 2025
Senate · Passed
Senate Vote: pass (30-21)
senate
Apr 7, 2025
Upper · Passed
Minority; without recommendation.
upper
Apr 7, 2025
Upper · Passed
Minority; do not pass.
upper
Apr 7, 2025
Upper · Passed
WM - Majority; do pass.
upper
Apr 7, 2025
Upper · Passed
Executive action taken in the Senate Committee on Ways & Means at 1:30 PM.
upper
Apr 3, 2025
Upper · Passed
Public hearing in the Senate Committee on Ways & Means at 1:30 PM.
upper
Mar 25, 2025
Committee
Referred to Ways & Means.
upper
Mar 24, 2025
Committee
And refer to Ways & Means.
upper
Mar 24, 2025
Upper · Passed
Minority; without recommendation.
upper
Mar 24, 2025
Upper · Passed
Minority; do not pass.
upper
Mar 24, 2025
Upper · Passed
LGV - Majority; do pass.
upper
Mar 24, 2025
Upper · Passed
Executive action taken in the Senate Committee on Local Government at 1:30 PM.
upper
Mar 17, 2025
Upper · Passed
Public hearing in the Senate Committee on Local Government at 1:30 PM.
upper
Mar 11, 2025
House · Passed
House Vote: pass (57-40-3)
house
Feb 28, 2025
Committee
Referred to Rules 2 Review.
lower
Feb 25, 2025
Lower · Passed
Minority; do not pass.
lower
Feb 25, 2025
Lower · Passed
Executive action taken in the House Committee on Appropriations at 1:30 PM.
lower
Feb 22, 2025
Lower · Passed
Public hearing in the House Committee on Appropriations at 9:00 AM.
lower
Jan 29, 2025
Committee
Referred to Appropriations.
lower
Jan 24, 2025
Lower · Passed
Minority; without recommendation.
lower
Jan 24, 2025
Lower · Passed
Executive action taken in the House Committee on Local Government at 10:30 AM.
lower
Jan 21, 2025
Lower · Passed
Public hearing in the House Committee on Local Government at 10:30 AM.
lower
1 primary · 10 co-sponsors
Sponsors
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