Tucson ADU Permit

What's Required in Tucson

• Building permit required for all secondary dwelling units.
• Must have full kitchen and bathroom facilities for habitation.
• Requires architectural plan set including foundation.
• Must meet lot coverage and setback rules for the zoning district.
• Owner-occupancy of the primary home is a mandatory requirement.
• Maximum size capped (usually 1,000 sq ft or 75% of main house).

How Much Does an ADU Permit Cost in Tucson?

Budget $1,000–$4,000 for the Tucson permit itself (valuation-based), issued by the Planning and Development Services Department — but treat that as the entry fee, not the total. ADUs are full dwelling units, so the permit stack usually includes building, electrical, plumbing, and mechanical trade permits, plus plan review. One local note: includes building, zoning, and utility capacity fees. Get an itemized fee estimate from the department before finalizing your budget; the spread between a simple conversion and a new detached build is wide.

ADU Size Limits and Zoning Rules in Tucson

Before drawing plans, check the two gates that sink most ADU projects: size and zoning. Size ceilings vary by lot and ADU type (attached, detached, or conversion), so confirm your specific configuration. Other recorded conditions: owner-occupancy of the primary home is a mandatory requirement. Setbacks, height limits, and utility connections layer on top of those rules. The Planning and Development Services Department can confirm what your specific lot allows — worth doing before you pay for architectural drawings rather than after.

How to Get a ADU Permit in Tucson

Frequently Asked Questions