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 [1]
| Allowed Zones | Limited to select residential zones |
| Max Size (Detached) | 75% of primary dwelling, up to 1,000 sq ft (minimum 650 sq ft guaranteed) |
| Max Size (Attached) | 75% of primary dwelling, up to 1,000 sq ft (minimum 650 sq ft guaranteed) |
| Max Size (JADU) | Not allowed |
| Max Height | 30 feet |
| Max Units | 2 per lot (3 on lots over 1 acre if at least one is affordable) |
Setback Requirements [1]
| Rear Setback | 20 feet |
| Side Setback | 5 feet |
| Front Setback | 25 feet |
| Parking Required | No parking required (effective November 2024, AZ HB 2720) |
| 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 [2][3]
| 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 |
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Rental Income Potential [4][5]
| 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 |
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Recent Law Changes
What's Changed Recently
- Phoenix expanded ADU-allowed zones to cover all single-family residential (2026)
- Scottsdale updated ADU design standards with modern architectural options
- Tucson ADU incentive program: Waived permits for units under 500 sq ft
- Arizona SB 1117 effects: State preemption of local ADU restrictions expanding
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
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- ADU Amendments: HB 2720 — City of Tucson Planning Department — Accessed 2026-02-25
- HomeAdvisor — ADU Construction Cost Data Market Data — Accessed 2026-02-24
- Angi — Local ADU Contractor Costs Market Data — Accessed 2026-02-24
- Zillow Rental Manager — Market Rent Data Market Data — Accessed 2026-02-24
- HUD Fair Market Rents Government Data — Accessed 2026-02-24
- Arizona ADU Legislation (SB 1132, 2023) Government Data — Accessed 2026-02-24
Frequently Asked Questions
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