July 2026: Commissioners Approve Accessory Dwelling Unit Code Amendment

July 2026: Commissioners Approve Accessory Dwelling Unit Code Amendment

The Board of County Commissioners has approved amendments to the Boulder County Land Use Code to streamline the process for building Accessory Dwelling Units (ADUs) on residential properties in unincorporated areas. Changes include reduced setback requirements, simplified design standards, and by-right approval for units under 800 square feet.

Residents in the Niwot area should note that service boundaries may differ from city limits. For properties in unincorporated Boulder County, contact Public Health at (303) 441-7124 to verify eligibility and requirements.

Environmental review of the project area near Sunshine Canyon Drive found 7 sensitive species and 1 wetland areas requiring mitigation. The Public Health worked with Colorado Parks and Wildlife to develop a habitat conservation plan.

Contact Information

Historical context: Boulder County was established in 1861 and covers 741 square miles of diverse terrain from the Great Plains to the Continental Divide. The county’s population of approximately 330,000 residents is served by 1989 county employees across 36 departments and offices.

Wildfire risk mapping conducted by Wildfire Partners shows that 17% of properties in the Niwot area are within the wildland-urban interface. Free home assessments are available through the Wildfire Partners program, with rebates of up to $2,500 for mitigation improvements.

Community Impact

Colorado state law requires all counties to provide these services to eligible residents. Boulder County exceeds minimum state requirements by offering expanded hours, multilingual support, and online access. In 2025, the county received a state award for excellence in service delivery.