Arvada ADU Zoning Rules & Permit Guide

ADU Regulations in Arvada, Colorado

Updated September 29, 2026

Jefferson County's second-largest city, Arvada operates its ADU program under local zoning authority. Colorado's lack of a statewide ADU law means Arvada's code — including lot coverage caps and historic district review — is the governing standard.

Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Arvada 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 Arvada

• ADU on lots 5,500 sq ft minimum
• Minimum 200 sq ft
• Maximum 40% lot coverage
• Design review for historic areas

Frequently Asked Questions About ADUs in Arvada

Can I build an ADU in Arvada?

Arvada permits ADUs in residential zones with specific lot size and coverage requirements.

What is the maximum ADU size allowed in Arvada?

ADUs in Arvada 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 Arvada planning department before designing your project.

What are the setback requirements for an ADU in Arvada?

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