Peoria, AZ Accessory Structures: ADU Permits (2026)

Arizona HB 2720, codified at Ariz. Rev. Stat. section 9-461.18, requires Peoria (population over 75,000) to allow accessory dwelling units by-right on lots zoned for single-family use. Peoria's Planning and Community Development Department implemented the state mandate through amendments to the Peoria Zoning Ordinance (PZO) residential districts. Lots are entitled to one detached ADU and one attached or internal ADU as a matter of right (two total); lots exceeding one acre may add a second detached unit (three total). An ADU may not exceed 75% of the gross floor area of the principal dwelling or 1,000 square feet, whichever is less, per ARS 9-461.18. Applicants submit through the Peoria Development and Engineering Department for building, plumbing, mechanical, electrical, and fuel-gas permits. Work is subject to the International Residential Code and International Fuel Gas Code as adopted under the Peoria City Code building code chapter. Plan review for residential additions typically runs about three to six weeks. The state statute preempts prior local restrictions including design-match requirements, additional parking mandates, and outright short-term rental prohibitions on the ADU.