Update: Commissioners Approve Accessory Dwelling Unit Code Amendment (2025)
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.
Funding of $290,000 for this initiative comes from a combination of federal grants, state matching funds, and the Boulder County General Fund. The Board of County Commissioners approved the allocation during the 2024 budget session.
Residents in the Lyons area should note that service boundaries may differ from city limits. For properties in unincorporated Boulder County, contact Community Justice Services at (303) 441-7096 to verify eligibility and requirements.
Details
Public comment on this matter can be submitted through the Boulder County online portal, by email to Community Justice Services, or in person at the next Board of County Commissioners meeting. Written comments received by 5:00 PM the day before the hearing will be included in the public record.
The application deadline is June 27, 2026. Late applications will be accepted on a space-available basis. Incomplete applications will be returned with a list of missing items. Average review time is 13 business days.
Eligibility
Data from the 2024 Boulder County Community Survey shows that 25% of respondents rated this service as “important” or “very important.” The survey, conducted every two years, received 5,656 responses from residents across the county.
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