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][2]
Yes, you can build an ADU in Tucson. A detached ADU can be up to 1,000 sq ft under current Arizona and Tucson zoning rules.
| Allowed Zones | Residential zones permitting single-family dwellings (by-right under HB 2720) |
| 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 | Matches single-family height limit in the same zone (generally up to 25 ft) — Confirm with Tucson Planning & Development Services |
| Max Units | At least 1 attached + 1 detached per lot by-right; additional detached ADU on lots 1+ acre if one unit is restricted-affordable — Confirm exact count with Tucson Planning |
Setback Requirements [1][2]
Tucson requires a rear setback of about 5 ft for a detached ADU, and no additional parking is required. Owner-occupancy is not required — you can rent it out without living on the property.
| Rear Setback | 5 feet (limited to 5 ft from property line per HB 2720) |
| Side Setback | 5 feet (limited to 5 ft from property line per HB 2720) |
| Front Setback | Per zone front setback (ADUs permitted in front yards meeting the zone front setback) — Confirm with Tucson Planning |
| Parking Required | No additional parking required (effective Nov 21, 2024; ARS 9-461.18 / AZ HB 2720) |
| Owner Occupancy | Not required (HB 2720 prohibits owner-occupancy mandates for long-term rental) |
| Min Lot Size | 6,000 sq ft |
Permit Process & Fees
An ADU permit in Tucson typically costs $3,500-$5,500 and takes 90-120 days, through a ministerial, by-right review.
| Approval Process | Building permit (by-right permitted use; HB 2720 prohibits requiring a special/conditional use permit, variance, or public hearing) |
| 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 [3][4]
Building an ADU in Tucson typically costs $110,000-$220,000 ($145-$290 per sq ft); a garage conversion runs $55,000-$130,000.
| 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 [5][6]
A 2-bedroom ADU in Tucson rents for around $1,400-$1,900/mo, an estimated 6-8% annual return.
| 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
- Tucson Mayor & Council adopted HB 2720-compliant ADU amendments on Oct 22, 2024, effective Nov 21, 2024: increased ADUs allowed per lot, removed parking requirements, removed owner-occupancy, capped rear/side setbacks at 5 ft, and made ADUs a by-right permitted use
- Arizona HB 2720 (ARS 9-461.18, effective Jan 1, 2025): cities over 75,000 must allow attached + detached ADUs by-right
- Arizona HB 2928 (signed May 2025): extended ADU requirements to counties (compliance deadline Jan 1, 2026)
- Confirm current review status and any zone-specific limits with Tucson Planning & Development Services
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
ADU Builders in Tucson
Looking for an ADU builder in Tucson? ADU projects need a contractor experienced with local zoning, the permit process, and utility connections — not every general contractor has built one. We match Tucson homeowners with experienced local ADU contractors who provide free, no-obligation quotes. Getting at least three bids typically saves 20-40% on the same scope.
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- ARS 9-461.18 — Accessory dwelling units; regulation; applicability; definitions Government Data — Accessed 2026-06-28
- ADU Amendments: HB 2720 — Casitas in Tucson (City of Tucson PDSD) Planning Department — Accessed 2026-06-28
- Angi — 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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