Compare ADU zoning rules across 7 Arizona cities. Average ADU score: 6.0/10.
| City | Max Size | Setbacks | Permit Fees | Build Cost | 1BR Rent | Score |
|---|---|---|---|---|---|---|
| Chandler | 75% of the single-family dwelling's gross floor area (interior habitable area) or 1,000 sq ft, whichever is less | 5 feet minimum (uninhabitable space attached to an ADU, e.g. a garage, must meet full district setbacks) | Valuation-based per Chandler fee schedule using ICC Building Valuation Data (minimum permit fee $60); third-party guides estimate roughly 1.5-2% of construction value plus plan review — confirm exact amounts with Chandler Development Services | $125,000-$250,000 | $1,350-$1,700/mo | 6/10 |
| Gilbert | 75% of the primary residence's gross square footage (state law guarantees at least the lesser of 1,000 sq ft or 75%) | 5 feet maximum required (ARS 9-461.18 caps rear setbacks at 5 ft) | Building permit and plan review fees based on valuation — Confirm with Gilbert Development Services | $130,000-$260,000 | $1,500-$1,750/mo | 6/10 |
| Mesa | 75% of primary residence's interior habitable area or 1,000 sq ft, whichever is less | 5 feet minimum for new structures; existing-structure conversions require no additional setback | Valuation-based per Mesa's Schedule of Fees & Charges; no flat ADU fee published — confirm with Mesa Development Services | $120,000-$240,000 | $1,150-$1,450/mo | 7/10 |
| Phoenix | 1,000 sq ft on lots up to 10,000 sq ft (75% of primary dwelling, whichever is less); on lots over 10,000 sq ft, the lesser of 3,000 sq ft or 10% of net lot area | 5 feet (3 ft for some detached configurations per ZO 706; statute caps rear/side at 5 ft) | $2,500-$4,200 | $120,000-$240,000 | $1,250-$1,700/mo | 6/10 |
| Scottsdale | 1,000 sq ft or 75% of primary dwelling (whichever is less); 500 sq ft for second/third ADU | 5 feet (detached ADU may be as close as 5 ft to rear lot line) | $5,000-$8,000 | $140,000-$280,000 | $1,500-$2,000/mo | 5/10 |
| Tempe | 1,000 sq ft or 75% of the main dwelling's gross floor area, whichever is less | 5 feet minimum (all districts, unless the district allows less) | Building permit and plan review fees based on valuation — Confirm with Tempe Community Development | $120,000-$250,000 | $1,300-$1,700/mo | 7/10 |
| Tucson | 75% of primary dwelling, up to 1,000 sq ft (minimum 650 sq ft guaranteed) | 5 feet (limited to 5 ft from property line per HB 2720) | $3,500-$5,500 | $110,000-$220,000 | $1,100-$1,500/mo | 5/10 |
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