Garage conversion rules in Boulder County, CO — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Converting a garage into living space, or into an accessory dwelling, requires a building permit and must comply with the Boulder County Land Use Code. A detached garage designed with habitable space (such as a second-floor unit) is treated as an accessory dwelling and counts toward the parcel's Residential Floor
There is no separate 'garage conversion' section in the Land Use Code; a conversion is regulated as either added Residential Floor Area or a new accessory dwelling. The BCLUC expressly treats a detached garage designed with habitable space (for example, living quarters on the second floor) as an Accessory Dwelling Unit that must meet the county's residential building and floodplain standards. Converting an attached or detached garage to a bedroom, office, or apartment therefore requires a building permit, may require added onsite wastewater capacity (CDPHE Reg 43), and must stay within the parcel's maximum Residential Floor Area. In floodplain areas, converted space below the flood protection elevation faces additional restrictions.
Occupying a converted garage as living space without permits is a zoning and building code violation; the county may order the space returned to non-habitable use or bring enforcement and fines under Article 4-1300.
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