Tempe ADU Zoning Rules & Permit Guide

ADU Regulations in Tempe, Arizona

Updated September 29, 2026

Home to Arizona State University in Maricopa County, Tempe allows ADUs in residential zones under local ordinance. The high rental demand from students makes ADUs a popular option for property owners.

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

Additional Local Requirements for Tempe

• 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 Tempe

Can I build an ADU in Tempe?

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 Tempe?

ADUs in Tempe 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 Tempe planning department before designing your project.

What are the setback requirements for an ADU in Tempe?

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