Phoenix processes ADU permits through Planning and Development under PZC Section 608 (Casita Ordinance) and 2024 Phoenix ADU updates. Arizona HB 2928 (effective 2025) preempts local restrictions in cities over 75,000 residents, requiring ministerial approval for ADUs meeting state standards.
Phoenix Zoning Ordinance Section 608 governs ADUs (casitas) in single-family zones. Arizona House Bill 2928 (signed 2024, effective 2025) significantly expanded ADU rights statewide, preempting local restrictions in cities over 75,000 population. Under HB 2928, Phoenix must allow at least one ADU per single-family lot, require ministerial (over-the-counter) review without discretionary hearings, and cannot require additional parking. Phoenix applications file through the Planning and Development Department online portal (PHX At Your Service). Required: site plan, floor plans, structural calculations, energy compliance, and utility connection plans. Maximum ADU size under HB 2928: 75 percent of primary dwelling or 1,000 sq ft, whichever is less. Setbacks must match the primary structure zone. Plan review takes 10-20 business days for residential ADUs.
Building an ADU without permit results in stop-work orders, double permit fees, and civil penalties up to $2,500 per violation under PZC enforcement. Continued violations face daily fines and potential criminal misdemeanor charges. Liens may be filed on the property.
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