Gilbert ADU Zoning Rules & Permit Guide

ADU Regulations in Gilbert, Arizona

Updated September 29, 2026

One of Arizona's fastest-growing suburbs in Maricopa County, Gilbert permits ADUs through local ordinance. Arizona has no statewide ADU mandate, so Gilbert's zoning code is the final authority on accessory units.

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

Additional Local Requirements for Gilbert

• 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 Gilbert

Can I build an ADU in Gilbert?

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 Gilbert?

ADUs in Gilbert 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 Gilbert planning department before designing your project.

What are the setback requirements for an ADU in Gilbert?

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