Arizona Zoning — Fast Growth, Fast Permits & ADU Expansion
Data version: Q2 2026 · Last updated 2026-05-13
TL;DR. Arizona is one of the fastest-growing states with the Phoenix metropolitan area consistently straining housing supply. The state has a pro-development regulatory environment with some of the fastest permitting in the country. Arizona HB 2720 (2025) requires ADUs statewide. Water supply is becoming the defining constraint for new development. Buildability™ analyzes all Arizona-specific factors.
Arizona HB 2720 ADU law
Arizona HB 2720 (effective 2025) requires all cities to allow up to 2 ADUs per single-family lot. Maximum size: 1,000 sq ft or 50% of primary dwelling area. Short-term rentals allowed in ADUs. No additional parking required. This state preemption overrides local restrictions across Phoenix, Scottsdale, Tucson, Mesa, and all Arizona municipalities.
Fastest major-city permitting
Arizona generally has business-friendly permitting faster than coastal states. Phoenix metro: 2-6 weeks for standard residential — among the fastest in any major U.S. city. Pre-approved plan sets available for even faster processing. Commercial: 4-12 weeks. No state income tax. Permit costs: $1,000-$5,000 for residential, significantly lower than California or New York.
Water supply constraints
Water is an increasingly important factor for Arizona development. New subdivisions in some areas require a 100-year assured water supply certification. Groundwater depletion in the West Valley has halted some subdivision approvals. Individual lots within existing subdivisions generally have water service. Buildability™ checks infrastructure readiness including water availability.
Major Arizona markets
Phoenix (1.6M, R1/R-3/C-2 zones, 2-4 week permits, village planning committees), Tucson (545K, ADU ordinances, university-area density), Mesa (510K, light rail TOD), Scottsdale (245K, strict design review, high-value residential), Chandler (280K, PAD zones, fast processing). Common AZ zones: R1, R-3, R-5, C-1, C-2, A-1.
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