Aurora ADU Zoning Rules & Permit Guide

ADU Regulations in Aurora, Colorado

Updated September 29, 2026

Colorado's third-largest city, Aurora permits ADUs through its local zoning code. Colorado has no statewide ADU mandate, so Aurora's municipal code establishes all requirements including minimum lot sizes and design review standards.

Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Aurora as of 2026. Regulations are governed by local zoning ordinances, as Colorado has no statewide ADU mandate (HB 24-1152 addresses transit density).

Additional Local Requirements for Aurora

• ADU on lots 6,000 sq ft minimum
• Minimum 300 sq ft
• Design review for exterior changes
• Short-term rentals prohibited
• ⚠️ CO has NO statewide ADU mandate

Frequently Asked Questions About ADUs in Aurora

Can I build an ADU in Aurora?

Aurora allows ADUs in single-family zones. The city has specific design standards and a minimum lot size requirement.

What is the maximum ADU size allowed in Aurora?

ADUs in Aurora can be up to 1,200 square feet, subject to the property's zoning and lot coverage limits. Always confirm the exact allowed size with the Aurora planning department before designing your project.

What are the setback requirements for an ADU in Aurora?

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