Understanding Denver’s ADU Zoning Laws with 303 Construction

Building an Accessory Dwelling Unit (ADU) in Denver is a great way to create rental income, add living space for family members, or increase property value. However, Denver has specific zoning laws and permit requirementsthat homeowners must follow. At 303 Construction, we help navigate the zoning, design, and approval process to ensure your ADU project complies with city regulations.

What is an ADU?

An Accessory Dwelling Unit (ADU) is a secondary, smaller housing unit located on the same lot as a primary residence. ADUs can be:

• Detached ADUs (DADUs) – A separate structure in the backyard.
• Attached ADUs (AADUs) – A unit connected to the main home.
• Basement ADUs – A converted basement apartment.
• Garage Conversions – Transforming an existing garage into a livable space.

Where Are ADUs Allowed in Denver?

• As of 2024, ADUs are permitted in many residential zones but require zoning verification.
• The City of Denver allows ADUs in specific single-family residential (SU) zones, including SU-A, SU-B, and SU-C.
• Some properties may need rezoning approval before ADU construction.

ADU Size & Height Restrictions

• The maximum ADU size depends on lot size and zoning but typically ranges from 650 to 1,000 square feet.
• Detached ADUs cannot exceed 24 feet in height.

Parking & Utility Requirements

• Off-street parking may be required, depending on location.
• ADUs must have separate utility connections or shared access with the main home.

How 303 Construction Simplifies the ADU Process

• Zoning & permit consultation to ensure compliance.
• Custom ADU design to maximize space and efficiency.
• Seamless project management from start to finish.

Need help with zoning approvals and ADU construction in Denver? Contact 303 Construction today!