ADU rules in Phoenix, AZ — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Phoenix allows up to 2 ADUs per property (one attached, one detached) under Arizona HB 2720 (2024, effective January 2025). A third detached unit is permitted on lots of 1+ acre if one is designated affordable. Each ADU cannot exceed 75% of the main house floor area. On lots up to 10,000 sq ft, ADUs are capped at 1,000 sq ft; larger lots allow up to 3,000 sq ft or 10% of net lot area. Setbacks cannot exceed 5 feet. No additional parking required.
Arizona HB 2720 transformed ADU rules across the state effective January 2025. Phoenix cannot require owner-occupancy. ADUs must meet building code standards. The city has specific ADU guidelines published through the Development Services Department including a Beginner's Guide to ADUs. Contact Phoenix Public Works / 311 at 3-1-1 or (602) 262-6251 for specific enforcement information, to report violations, or to request a permit. Municipal code sections and fine schedules are available through the Phoenix City Code.
Specific penalty amounts for this ordinance are not published in a publicly accessible fine schedule. Contact Phoenix code enforcement directly for current fines, enforcement procedures, and hearing options.
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Side-by-side rule comparisons with other cities in Maricopa County.
See how other cities in Maricopa County handle adu rules.
See how Phoenix's adu rules rules stack up against other locations.
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