ADU Permits: Chandler vs Phoenix
How do adu permits rules compare between Chandler, AZ and Phoenix, AZ?
Chandler has fewer restrictions than Phoenix.
Chandler, AZ
Maricopa County
Chandler permits accessory dwelling units by-right under Arizona Revised Statutes section 9-461.18, enacted by HB 2720 in 2024 and effective for cities over 75,000 population on or before January 1, 2025. Chandler's Land Use and Zoning Code (City Code Chapter 35) was amended in late 2024 to comply. Single-family lots may have one detached and one attached ADU; lots over one acre may add a third detached ADU.
View full Chandler rules →Phoenix, AZ
Maricopa County
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.
View full Phoenix rules →Key Facts Comparison
| Fact | Chandler | Phoenix |
|---|---|---|
| State Mandate | Ariz. Rev. Stat. 9-461.18 (HB 2720) | - |
| City Code | Chandler Code Chapter 35 (amended 2024) | Phoenix PZC Section 608 |
| Units Allowed | 1 detached + 1 attached (3 if 1+ acre) | - |
| Permit Authority | Chandler Development Services | - |
| Building Code | 2024 IRC / IFGC as adopted | - |
| By-Right Standard | Yes on single-family lots | - |
| State Law | - | AZ HB 2928 (2025) |
| Max Size | - | 75% primary or 1,000 sq ft |
| Review Type | - | Ministerial (no hearing) |
| Review Time | - | 10-20 business days |
Highlighted rows indicate differences between cities.
Chandler FAQ
Can I build an ADU in Chandler by-right?
Yes. Under Arizona HB 2720 (Ariz. Rev. Stat. 9-461.18), Chandler must allow one detached and one attached ADU by-right on every single-family lot. Lots over one acre may add a third detached unit. Building, plumbing, and electrical permits through Chandler Development Services are still required.
How long does ADU permitting take in Chandler?
Plan review for a standard residential ADU runs approximately two to six weeks at Chandler Development Services, depending on plan completeness and current workload. Construction inspections occur at standard milestones before final certificate of occupancy is issued.
Phoenix FAQ
Do I need a permit for a Phoenix ADU?
Yes. All ADUs require building permits through Phoenix Planning and Development under PZC Section 608. Under HB 2928, review is ministerial (over-the-counter) without public hearings, but full structural and trade permits are required.
How big can my Phoenix ADU be?
Under Arizona HB 2928, ADUs are limited to 75 percent of the primary dwelling size or 1,000 square feet, whichever is less. Phoenix cannot impose a smaller maximum size than state law.
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