Regulation of Accessory Dwelling Units.
HB 627 requires local governments to allow the construction of at least one accessory dwelling unit (ADU) for each single-family home in residential zones, aiming to increase affordable housing options. The bill prohibits local governments from imposing certain restrictions, such as minimum parking requirements, banning long-term rentals of both units, or setting maximum ADU sizes under 800 square feet. However, local governments may still regulate aspects like setbacks or require ADUs to be smaller than the primary dwelling. Local governments must adopt regulations by January 1, 2027, or ADUs will be permitted without any local limitations.
Bill status
died
1 of 4 stages cleared
Introduction
Mar 2025
Committee Review
Floor Vote
Governor
Introduced Mar 31, 2025
Last action May 7, 2025
Maddy AI version diff · 2 comparisons
What changed between versions
Edition 1
→
Edition 2
·
3 edits
MINOR
This bill was revised to remove the requirement that accessory dwelling units must be located to the side or rear of the primary dwelling, while adding a new requirement that they must be connected to water, well, and septic systems. The committee substitute also renumbered some sections and updated the version identifier. These changes clarify placement rules and add infrastructure requirements for new accessory dwelling units.
Scope change
The bill's scope was modified by removing a location requirement and adding a new infrastructure requirement, which affects where accessory dwelling units can be built and what utilities they must have.
REQUIREMENT
Removed the requirement that accessory dwelling units must be located to the side or rear of the primary single-family detached dwelling.
Added a requirement that accessory dwelling units must be connected to water, well, and septic systems.
TECHNICAL
Updated document version identifier from 'First Edition' to 'Second Edition' and adjusted page numbering and committee substitute notation.
Floor votes
How they voted
No floor votes recorded yet.
Full legislative history
Actions timeline
Total actions
12
Key actions
3
Committee
7
May 7, 2025
Committee
Re-ref Com On Rules, Calendar, and Operations of the House
lower
May 6, 2025
Lower · Passed
Reptd Fav
lower
Apr 29, 2025
Committee
Re-ref Com On Rules, Calendar, and Operations of the House
lower
Apr 29, 2025
Lower · Passed
Reptd Fav Com Substitute
lower
Apr 17, 2025
Committee
Re-ref Com On Regulatory Reform
lower
Apr 17, 2025
Lower · Passed
Reptd Fav
lower
Apr 2, 2025
Committee
Ref to the Com on Housing and Development, if favorable, Regulatory Reform, if favorable, Rules, Calendar, and Operations of the House
lower
Mar 31, 2025
Introduced
Filed
lower
1 primary · 13 co-sponsors
Sponsors
Role
Legislator
Party
State
District
P
Vernetta Alston
DDemocratic
Co
Allison Dahle
DDemocratic
Co
Eric Ager
DDemocratic
Co
Frances Jackson
DDemocratic
Co
Garland Pierce
DDemocratic
Co
Jordan Lopez
DDemocratic
Co
Julia Greenfield
DDemocratic
Co
Maria Cervania
DDemocratic
Co
Matthew Winslow
RRepublican
Co
Monika Johnson-Hostler
DDemocratic
Co
Sarah Crawford
DDemocratic
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