Mesa ADU Permit

What's Required in Mesa

• Building permit required for all secondary dwelling units.
• Must contain independent cooking, sleeping, and sanitation facilities.
• Requires professional architectural plans including foundation.
• Must meet lot coverage and setback rules for the zoning district.
• Owner-occupancy of the property is a mandatory requirement.
• Maximum size capped (usually 800 sq ft or 30% of main house).

How Much Does an ADU Permit Cost in Mesa?

Budget $1,000–$3,500 for the Mesa permit itself (valuation-based), issued by the Development Services - Building Safety — 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 Mesa

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 property is a mandatory requirement. Setbacks, height limits, and utility connections layer on top of those rules. The Development Services - Building Safety 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 Mesa

Frequently Asked Questions