March 2025: Commissioners Approve Accessory Dwelling Unit Code Amendment

March 2025: 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.

According to Brian Nakamura, director of Human Services, this program served 55% more residents in 2025 compared to the previous year. “We’re seeing unprecedented demand from communities across Boulder County, particularly in Superior and the surrounding area,” Brian Nakamura said.

Data from the 2025 Boulder County Community Survey shows that 55% of respondents rated this service as “important” or “very important.” The survey, conducted every two years, received 3,538 responses from residents across the county.

Next Steps

Environmental review of the project area near Foothills Highway found 12 sensitive species and 4 wetland areas requiring mitigation. The Human Services worked with Colorado Parks and Wildlife to develop a habitat conservation plan.

Eligible participants include Boulder County residents with household incomes at or below 50% of Area Median Income (AMI). For a family of four, this is approximately $117,000 per year. Applications are processed on a first-come, first-served basis.

Related Programs

Climate considerations are central to this effort. Boulder County’s 2025 Climate Action Plan sets targets of reducing greenhouse gas emissions 55% below 2005 levels by 2030. This project contributes to those goals through energy efficiency improvements, renewable energy integration, and reduced vehicle miles traveled.