ADU Permits: Oro Valley vs Tucson
How do adu permits rules compare between Oro Valley, AZ and Tucson, AZ?
Oro Valley, AZ
Pima County
No data available yet for Oro Valley.
Tucson, AZ
Pima County
Tucson permits ADUs (casitas) under the Unified Development Code as amended November 21, 2024 to comply with Arizona HB 2720. Planning and Development Services Department (PDSD) issues permits ministerially in single-family zones without discretionary hearings. Maximum 75% of primary dwelling gross floor area or 1,000 sq ft, with a 650 sq ft floor regardless of primary size.
View full Tucson rules →Key Facts Comparison
| Fact | Oro Valley | Tucson |
|---|---|---|
| State Law | - | AZ HB 2720 (effective 2025) |
| City Code | - | Tucson UDC amended 11/21/2024 |
| Max Size | - | 75% primary or 1,000 sq ft |
| Min Floor | - | 650 sq ft any lot |
| Parking | - | Not required |
| Setbacks | - | 5 ft side and rear |
Highlighted rows indicate differences between cities.
Oro Valley FAQ
No FAQs available.
Tucson FAQ
Do I need a permit for a casita in Tucson?
Yes. All casitas require building permits through Tucson Planning and Development Services. Since the November 2024 UDC amendment, review is ministerial (no public hearing) for ADUs meeting state HB 2720 standards. Full structural, electrical, mechanical, and plumbing trade permits are required.
How many casitas can I build on my Tucson lot?
At least one ADU is permitted on every single-family lot. Up to two ADUs are allowed on lots with an existing single-family home. A third ADU is permitted on lots over one acre if one unit is deed-restricted as affordable to households at 80% of area median income.
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