HB 2928 Arizona House · 57th Legislature - First Regular Session

accessory dwelling units; requirements

HB 2928 requires Arizona cities with over 75,000 residents to allow accessory dwelling units (ADUs) on single-family residential lots without special permits or public hearings. The bill mandates cities to permit at least one attached and one detached ADU per lot, with size limits of 75% of the main house’s floor area or 1,000 square feet (whichever is smaller), and requires one affordable ADU (rented to households earning ≤80% of area median income) on lots of one acre or more. It prohibits cities from imposing restrictions like requiring owner-occupant relationships, extra parking, matching architectural styles, or stricter setbacks for ADUs compared to main homes. If a city fails to adopt these rules by January 1, 2025, ADUs will be permitted without limits across all residential zones in that city.

Issues: ✓ Housing

Bill status signed all 5 stages cleared

Introduction

Feb 2025

Committee Review

Mar 2025

House Passage

May 2025

Senate Passage

May 2025

Signed into Law

May 2025

Introduced Feb 12, 2025 Signed May 23, 2025

Maddy AI version diff · 3 comparisons

What changed between versions

Senate Engrossed Version → Chaptered Version · 3 edits

MINOR

The bill was formally enacted into law as Chapter 217 after being approved by the Governor on May 23, 2025. The text includes minor formatting adjustments to the title page and a reflow of a sentence regarding sex offender restrictions, but no substantive policy changes were made to the bill's requirements or scope.

Scope change

None; the bill's scope and applicability remain unchanged.

TECHNICAL

Minor formatting and layout adjustments were made to the title page, including updating the header from 'Senate Engrossed Version' to 'Chapter 0217' and reordering the text 'House Bill 2928'.

A sentence regarding restrictions on owners convicted of serious felonies was reflowed across multiple lines for readability, with no change to the legal meaning.

TIMELINE

Official enactment dates were added at the end of the document, noting Governor approval and filing with the Secretary of State on May 23, 2025.

Introduced Version → House Engrossed Version · 8 edits · May 7, 2025

MODERATE

This bill amends Arizona laws to standardize accessory dwelling unit (ADU) regulations for both cities and counties, requiring larger municipalities to allow ADUs as permitted uses without restrictive conditions. It also updates vacation rental and short-term rental regulations for both cities and counties, adding new enforcement mechanisms and clarifying definitions. The changes aim to increase housing supply and reduce local regulatory barriers while maintaining public safety standards.

Scope change

The bill expands regulatory authority from municipalities only to include counties, requiring counties to adopt similar ADU regulations. It also adds a new section to Title 11 regarding county planning and modifies vacation rental regulations to apply to both cities and counties.

SCOPE

Added new section 11-810.01 requiring counties to adopt ADU regulations similar to those required for municipalities, expanding the bill's applicability from cities to counties.

TIMELINE

Changed the deadline for counties to adopt ADU regulations from January 1, 2025 to January 1, 2026, giving counties one additional year to comply.

REQUIREMENT

Added new requirements for counties regarding septic systems, allowing counties to require adequate septic sizing for ADUs not connected to sewer systems.

Modified ADU size requirements for counties to allow larger ADUs than the 75% or 1,000 square foot limit, giving counties flexibility to permit larger units.

Removed the requirement for ADUs to match exterior design, roof pitch, or finishing materials of the main dwelling, reducing aesthetic restrictions.

ENFORCEMENT

Enhanced vacation rental enforcement by adding civil penalty amounts tied to rent (up to three nights' rent for third violations) and clarifying suspension procedures for verified violations.

Added provisions requiring vacation rental owners to provide emergency contact information and displaying permit/license numbers on advertisements.

DEFINITION

Added new definition for 'restricted-affordable dwelling unit' meaning a unit rented to households earning up to 80% of area median income through deed restriction or development agreement.

Floor votes · Senate May 7, 2025 · House Mar 10, 2025

How they voted

21–6

Passed · 3 other

Total votes 30

May 7, 2025

D Democratic13

10 Yea 3

76% Yea

R Republican17

11 Yea 6 Nay

64% Yea

Vote distribution

All Yea All Nay Mixed No data

Full legislative history

Actions timeline

Total actions

Key actions

Committee

Amendments

May 23, 2025

Signed into law

Signed by Governor

executive

May 20, 2025

Lower · Passed

PASSED

lower

May 7, 2025

Upper · Passed

PASSED

upper

May 7, 2025

Upper · Passed

DPA

upper

Mar 26, 2025

Upper · Passed

upper

Mar 10, 2025

Lower · Passed

PASSED

lower

Mar 5, 2025

Lower · Passed

DPA

lower

Feb 20, 2025

Lower · Passed

lower

1 primary · 4 co-sponsors