Tucson allows ADUs in select residential zones with restrictive setback requirements and smaller size limits. The city is moderately ADU-friendly but requires careful site analysis to verify zone compatibility.
Zoning & Size Requirements
| Allowed Zones | Limited to select residential zones |
| Max Size (Detached) | 750 sq ft |
| Max Size (Attached) | 600 sq ft |
| Max Size (JADU) | Not allowed |
| Max Height | 30 feet |
| Max Units | 1 ADU per lot |
Setback Requirements
| Rear Setback | 20 feet |
| Side Setback | 5 feet |
| Front Setback | 25 feet |
| Parking Required | 2 spaces per lot |
| Owner Occupancy | May be required in some zones |
| Min Lot Size | 6,000 sq ft |
Permit Process & Fees
| Approval Process | Conditional use permit required |
| Review Timeline | 90-120 days |
| Permit Fees | $3,500-$5,500 |
| Impact Fees | $1,200-$2,000 |
| Plan Check | 4-6 weeks |
| Pre-Approved Plans | Not available |
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Construction Costs
| Average Build Cost | $110,000-$220,000 |
| Cost per Sq Ft | $145-$290 |
| Garage Conversion | $55,000-$130,000 |
| Prefab ADU (Installed) | $80,000-$180,000 (installed) |
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Compare ADU Financing Options →Rental Income Potential
| Avg Rent (1 Bedroom) | $1,100-$1,500/mo |
| Avg Rent (2 Bedroom) | $1,400-$1,900/mo |
| Short-Term Rental | Not permitted |
| Est. Annual ROI | 6-8% annual return |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half. Compare top prefab manufacturers.
Compare Prefab ADUs →Recent Law Changes
What's Changed Recently
- 2024: Expanded ADU allowance in select neighborhoods
- 2023: Streamlined conditional use permit process
- 2024: Added ADU provisions in infill zones
- 2023: Reduced conditional use permit timeline
Tips for Building an ADU in Tucson
- Conditional use permit requirement adds 90+ day timeline
- Many zones don't allow ADUs; verify compatibility early
- University of Arizona presence supports long-term rental demand
- Lower property costs than Phoenix; good ROI if approval obtained
Frequently Asked Questions
Can I build an ADU in Tucson?
Yes. ADUs are allowed in Limited to select residential zones in Tucson. The maximum size for a detached ADU is 750 sq ft. No owner-occupancy is required.
How much does an ADU cost in Tucson?
ADU construction in Tucson typically costs $110,000-$220,000. Garage conversions run $55,000-$130,000, and prefab ADUs cost $80,000-$180,000 (installed).
How much can I rent an ADU for in Tucson?
Average ADU rents in Tucson are $1,100-$1,500/mo for a 1-bedroom and $1,400-$1,900/mo for a 2-bedroom unit.
Do I need parking for an ADU in Tucson?
2 spaces per lot. Check with Tucson planning department for the latest Arizona ADU parking rules, as many states have relaxed requirements in recent years.
How long does it take to get an ADU permit in Tucson?
The permit review timeline in Tucson is 90-120 days. Fees range from $3,500-$5,500.
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