ADU (Accessory Dwelling Unit) Permit in Denver (2026)

Can I build an ADU in Denver?

Yes. Colorado HB 24-1175 (2024) requires Denver to allow at least one ADU per single-family lot by-right. Denver had an ADU ordinance in place before state law and has continued to expand ADU allowances. You can build a detached ADU up to 1,000 sqft in most single-family zones. No owner-occupancy requirement. Building permit from Denver CPD required. Colorado does not have the California JADU concept.

What is Colorado HB 24-1175 and how does it affect Denver?

Colorado HB 24-1175 (effective August 7, 2024) requires all Colorado municipalities with population over 1,000 to allow at least one ADU per single-family residential lot by-right. It removes minimum lot size requirements targeting ADU prohibition, limits parking requirements for ADUs, and creates state enforcement. For Denver, it reinforces and expands existing ADU allowances that were already in place through the city's own ordinance.

Do I need a permit for a home business in Denver?

Yes. A Denver Business License and Home Occupation Permit (approximately $50) are required to operate a business from your Denver home. You may have up to 2 customer visits per day, no non-resident employees, and no external evidence of business. The Colorado Cottage Food Act allows home-based food production (baked goods, jams, etc.) with CDPHE registration and no revenue cap. Note Denver's altitude (5,280 ft) can affect some food production processes.

Can I do short-term rentals on Airbnb in Denver?

Yes, with a Denver Short-Term Rental License ($100/year). The property must be your primary residence. Airbnb automatically collects and remits Denver and Colorado lodging taxes (approximately 10.75% combined). Display your license number on your listing. Operating without a license carries fines of up to $999 per violation. Only one STR license per person — Denver enforces this strictly.

What are the setbacks in Denver's U-SU-A zone?

In Denver's U-SU-A zone (Urban Single-Unit A, one of the most common single-family zones), the front setback is 20 feet, side setbacks are 5 feet on each side, and the rear setback is 20 feet. Maximum lot coverage is 45% and maximum height is 35 feet (3 stories). Use Denver's online zoning map or contact Denver CPD to confirm your specific parcel's zone designation and applicable standards.

Is solar required on new homes in Denver?

No. Colorado does not have a statewide new-construction solar mandate like California. Solar is strongly encouraged — Denver's 300+ annual sunny days create excellent solar production, and Xcel Energy offers net metering. The federal Investment Tax Credit (ITC) provides a 30% credit. Colorado also has a state income tax credit for residential solar. Denver's Green Building Ordinance applies to large commercial/multifamily buildings over 25,000 sqft but not single-family homes.

How do I look up the zoning for my Denver property?

Use Denver's online zoning map at https://www.denvergov.org/Government/Agencies-Departments-Offices/Community-Planning-and-Development/Denver-Zoning-Code/Zoning-Map. Enter your address to find your Denver Zoning Code zone designation. You can also contact Denver CPD Development Services at (720) 865-2705 or visit the Webb Municipal Building at 201 W. Colfax Ave, Denver. The Denver interactive zoning map shows zone districts, overlay zones, floodplains, and historic districts.