Commissioners Approve Accessory Dwelling Unit Code Amendment — Follow-Up Report

Commissioners Approve Accessory Dwelling Unit Code Amendment — Follow-Up Report

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.

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 1888 county employees across 44 departments and offices.

Residents in the Superior area should note that service boundaries may differ from city limits. For properties in unincorporated Boulder County, contact Assessor’s Office at (303) 441-8056 to verify eligibility and requirements.

Next Steps

The project includes improvements along Left Hand Canyon Drive between Superior and the intersection with SH-119 Diagonal Highway. Construction is scheduled to begin in June 2026 with completion expected within 8 months.

The Board of County Commissioners will review progress on this initiative at their June 13 business meeting. Agenda items and supporting documents are posted on the Boulder County website 72 hours before each meeting.