Permit Required? Required
Typical Fee Range $1,000–$4,000 Covers plan check, building permit, and proportional impact/utility fees.
Fee Method Valuation-based
Apply Online Apply at City of Phoenix Planning and Development Department →

What's Required in Phoenix

  • ADUs are allowed on single-family lots citywide (Coach houses or conversions).
  • Maximum size of 1,000 sq ft or 75% of the primary dwelling (whichever is less).
  • Must have independent kitchen, bathroom, and a separate entrance.
  • Must be located in the rear yard and maintain 3–5 foot setbacks from property lines.
  • Owner-occupancy is not required for the primary residence as of 2024/2026 rules.
  • Maximum height is generally limited to 15 feet for detached units.

How to Get a ADU Permit in Phoenix

1

Step 1: Check Lot Eligibility

Verify setbacks and density limits for your specific residential zone.

2

Step 2: Hire Architect

Prepare detailed structural, site, and MEP plans for review.

3

Step 3: Portal Submission

Submit the 'New Residential' application via PDD Online.

4

Step 4: Fee Payment

Pay the permit, plan check, and impact fees ($1,000+ typical).

5

Step 5: Full Inspection Series

Complete all sequence inspections (Foundation to Final).

Frequently Asked Questions

Yes, detached ADUs (up to 1,000 sq ft) are now permitted citywide.
Permit and review fees typically start around $1,000, not including utilities.
No, additional parking is generally not required for secondary dwelling units.