SB 1529 Arizona Senate · 57th Legislature - First Regular Session

municipal housing; preapproved design

SB 1529 requires Arizona municipalities to establish standardized preapproved housing design plans for single-family residential areas by specific dates (starting July 2026 for single-family homes and accessory units, January 2027 for duplexes/triplexes). It mandates at least three design options per class with defined size ranges (e.g., 800-2,000 sq ft for single-family homes, 200-1,000 sq ft for accessory units) and prohibits municipalities from restricting who can submit plans or conducting discretionary reviews. Municipalities must post approved designs online, allow administrative approval without delays, and maintain contact information for submitters. This bill directly affects local governments and developers seeking to build in single-family zones that permit multi-unit housing types.

Issues: ✓ Housing

Bill status signed all 5 stages cleared

Introduction

Feb 2025

Committee Review

Mar 2025

Senate Passage

Jun 2025

House Passage

Jun 2025

Signed into Law

Jul 2025

Introduced Feb 10, 2025 Signed Jul 1, 2025

Maddy AI version diff · 3 comparisons

What changed between versions

Senate Engrossed Version → Chaptered Version · 8 edits

MODERATE

The bill was reclassified from a Senate Bill to a Chaptered House version, changing its title and the specific Arizona Revised Statutes section it amends. The most significant substantive change is the addition of a new section (Sec. 2) that establishes a comprehensive, step-by-step legal process for cities and towns to annex unincorporated territory, including strict waiting periods, public notice requirements, and rules for calculating property ownership thresholds. The bill also introduces new protections for unincorporated areas, such as requirements that annexation cannot completely surround unincorporated land without a specific county finding, and mandates that annexed areas maintain zoning densities no greater than the county's pre-annexation limits.

Scope change

The bill's scope expanded from amending a single section regarding municipal housing to amending a section on cities and towns, which now includes a detailed new procedure for annexation.

REQUIREMENT

Added a new section detailing mandatory procedures for annexation, including filing blank petitions, a 30-day signature waiting period, specific public hearing notice requirements, and affidavit verification.

Established new rules for determining property ownership and value to calculate the required percentage of support for annexation petitions.

Mandated that annexed territory must adopt zoning classifications that do not exceed the density and uses permitted by the county immediately before annexation.

Added provisions for pre-annexation agreements that allow property owners to agree to future annexation without needing to sign the formal petition.

ELIGIBILITY

Added restrictions preventing annexation if it completely surrounds unincorporated territory unless the county board of supervisors finds no adverse impact on county services.

ENFORCEMENT

Created a legal mechanism allowing challenges to the validity of an annexation ordinance within 30 days of adoption, with the burden of proof on the challenger.

TIMELINE

Set specific timelines for various annexation steps, including a 30-day waiting period after petition filing before signatures can be collected and a 30-day period after ordinance adoption for the annexation to become final.

DEFINITION

Changed the bill's title and the specific Arizona Revised Statutes section referenced from 9-461.19 to 9-471.

Introduced Version → House Engrossed Version · 9 edits · Jun 27, 2025

MAJOR

This bill amends Arizona statutes to update municipal housing design requirements and revise annexation procedures. The housing section adds specific start dates for creating preapproved home plans, mandates three specific square footage options for accessory dwelling units, and establishes a program allowing municipalities to accept plans from other jurisdictions. The annexation section significantly expands the rules for cities extending their borders, adding new requirements for public notice, petition signatures, and protections for unincorporated areas and county parks.

Scope change

The bill expands the scope of municipal housing regulations by adding specific implementation dates and new options for accessory dwelling units. It also broadens the scope of annexation rules to include new procedural steps and specific protections for certain types of land and existing annexation attempts.

TIMELINE

Added specific effective dates for municipalities to create preapproved housing plans: July 1, 2026 for single-family and accessory dwelling units, and January 1, 2027 for duplexes and triplexes.

REQUIREMENT

Modified the requirement for accessory dwelling units to mandate exactly three specific sizes (200, 600, and 1,000 square feet) instead of a flexible range.

Added a new program allowing municipalities to accept preapproved housing designs developed by other municipalities or agencies in the state.

Added a requirement for municipalities to post preapproved housing plans on their official websites and to remove them within 30 days if requested by the applicant.

Added new annexation procedures requiring a 30-day waiting period before collecting petition signatures and specific public notice requirements including newspaper publication and mailings.

Added a restriction preventing cities from annexing territory that would completely surround unincorporated land unless the county board of supervisors finds no adverse impact on county services.

Added a provision allowing cities to annex county-owned parks or parks on public lands if agreed to by the county board of supervisors.

Added a requirement for cities to adopt a plan to provide infrastructure and services to annexed areas within ten years of the annexation becoming final.

ENFORCEMENT

Added a provision allowing property owners who successfully challenge an annexation to recover reasonable attorney fees and costs from the annexing municipality.

Floor votes · Senate Mar 13, 2025 · House Jun 26, 2025

How they voted

27–0

Passed · 3 other

Total votes 30

Mar 13, 2025

D Democratic13

10 Yea 3

76% Yea

R Republican17

17 Yea

100% Yea

Vote distribution

All Yea All Nay Mixed No data

Full legislative history

Actions timeline

Total actions

Key actions

Committee

Amendments

Jul 1, 2025

Signed into law

Signed by Governor

executive

Jun 27, 2025

Upper · Passed

PASSED

upper

Jun 26, 2025

Lower · Passed

DPA

lower

Jun 26, 2025

Lower · Passed

PASSED

lower

Mar 26, 2025

Lower · Passed

lower

Mar 13, 2025

Upper · Passed

PASSED

upper

Mar 6, 2025

Upper · Passed

DPA

upper

Feb 20, 2025

Upper · Passed

upper

1 primary · 0 co-sponsors