ADU Rules: Green Valley vs Oro Valley
How do adu rules rules compare between Green Valley, AZ and Oro Valley, AZ?
Green Valley has fewer restrictions than Oro Valley.
Green Valley, AZ
Pima County
Pima County allows accessory dwelling units (ADUs or guest houses) in certain residential zones subject to zoning code requirements. ADUs must be subordinate to the primary dwelling, meet setback and height limits, and comply with building code. ADUs built after September 14, 2024 and used as STRs require owner occupancy on the property.
View full Green Valley rules →Oro Valley, AZ
Pima County
ADUs (casitas, guest houses) permitted in certain zones, limited to 1,000 sq ft or 50 percent of primary dwelling. Owner occupancy required. Cannot be sold separately.
View full Oro Valley rules →Key Facts Comparison
| Fact | Green Valley | Oro Valley |
|---|---|---|
| Zones | CR-3, CR-5, SR, SH, GR-1 | - |
| Size Limit | Typically 50% of primary dwelling | - |
| Building Permit | Required from Development Services | - |
| STR Rule | Post-Sep 2024 ADUs: owner must reside on property | - |
| Parking | 1 additional off-street space | 1 additional off-street space |
| Max Size | - | 50% of primary or 1,000 sq ft (lesser) |
| Owner Occupancy | - | Required in primary or ADU |
| Separate Sale | - | Not permitted |
Highlighted rows indicate differences between cities.
Green Valley FAQ
Can I build a guest house on my property?
Yes, in most residential zones on larger lots (CR-3 and above). The ADU must be subordinate to the primary dwelling, meet setback requirements, and have a building permit from Pima County Development Services.
Can I rent my ADU as a short-term rental?
ADUs with certificates of occupancy issued after September 14, 2024 may only be used as STRs if the property owner lives on the property. ADUs built before that date are not subject to this restriction.
Oro Valley FAQ
Can I build a casita in my Oro Valley backyard?
Possibly. ADUs are permitted in certain residential zones subject to size limits, setback requirements, and owner-occupancy requirements. A building permit is required and your lot must have sufficient area.
Can I rent out my ADU as a short-term rental?
Short-term rental use of ADUs is subject to both the Town's short-term rental regulations and Arizona state law. Check with the Community and Economic Development Department for current restrictions in your zoning district.
Can my HOA block ADU construction?
HOA CC&Rs may impose additional restrictions beyond Town zoning. However, Arizona state law limits some HOA restrictions, particularly regarding solar installations under ARS 33-1816.
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