ADU Rules: Green Valley vs Marana
How do adu rules rules compare between Green Valley, AZ and Marana, AZ?
Green Valley and Marana have similar restriction levels.
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 →Marana, AZ
Pima County
Marana adopted ADU regulations under HB 2720 (LDC §17-6-14). State law applies: max ADU size 75% of primary dwelling or 1,000 sq ft; side/rear setback minimum 5 feet; no parking required. ADUs on lots with new ADUs (post Sep 14, 2024) used as STRs require owner-occupancy.
View full Marana rules →Key Facts Comparison
| Fact | Green Valley | Marana |
|---|---|---|
| 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 | Not required |
| Max Size | - | 75% of primary or 1,000 sq ft |
| Setback | - | 5 feet side/rear minimum |
| STR + ADU | - | Owner-occupancy required (post Sep 14, 2024) |
| Code Section | - | Marana LDC §17-6-14 |
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.
Marana FAQ
Can I build an ADU on my property in Marana?
Marana adopted ADU regulations under HB 2720 (LDC §17-6-14). State law applies: max ADU size 75% of primary dwelling or 1,000 sq ft; side/rear setback minimum 5 feet; no parking required. ADUs on lots with new ADUs (post Sep 14, 2024) used as STRs require owner-occupancy.
What are the size limits for an accessory dwelling unit in Marana?
Max Size: 75% of primary or 1,000 sq ft. Setback: 5 feet side/rear minimum. Parking: Not required. STR + ADU: Owner-occupancy required (post Sep 14, 2024).
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