Mesa ADU Zoning Rules & Permit Guide

ADU Regulations in Mesa, Arizona

Updated September 29, 2026

Arizona's third-largest city in Maricopa County, Mesa permits ADUs through its zoning ordinance. The state's hot desert climate influences design requirements, and local code governs all ADU approvals.

Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Mesa as of 2026. Regulations are governed by local zoning ordinances, as Arizona has no statewide ADU mandate.

Additional Local Requirements for Mesa

• ADU allowed in residential zones per local ordinance
• Minimum 200 sq ft
• Building permit required
• ⚠️ AZ has NO statewide ADU law — city code governs

Frequently Asked Questions About ADUs in Mesa

Can I build an ADU in Mesa?

This Arizona city permits ADUs under local ordinance. Confirm your zone's eligibility with the planning department first.

What is the maximum ADU size allowed in Mesa?

ADUs in Mesa can be up to 1,000 square feet, subject to the property's zoning and lot coverage limits. Always confirm the exact allowed size with the Mesa planning department before designing your project.

What are the setback requirements for an ADU in Mesa?

ADUs in Mesa generally require setbacks of 5 ft rear, 5 ft side. Arizona has no statewide ADU mandate — the exact setback figures come from Mesa's own zoning code, so confirm them with the city planning department before you design.