Garage conversion rules in Arapahoe County, CO — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Garage conversions in unincorporated Arapahoe County require building permits and must comply with the Land Development Code. Converting a garage to an ADU is permitted under Section 3-3.2 D. Off-street parking requirements must still be met.
Converting a garage to living space in unincorporated Arapahoe County requires a building permit from the Building Division. If the conversion creates a separate dwelling unit, it must comply with ADU regulations in LDC Section 3-3.2 D, including owner-occupancy requirements and the prohibition on short-term rentals. Detached ADUs may be built above a detached garage, barn, or carriage house. The conversion must meet all applicable building codes including egress windows, fire separation, insulation, and electrical requirements. Converting a garage may affect the property's off-street parking compliance, as the LDC requires minimum parking spaces per dwelling unit. Contact the Zoning Division to verify compliance before proceeding.
Unpermitted conversions face stop-work orders and may require restoration to original use. ADU conversions violating occupancy rules face enforcement.
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See how Arapahoe County's garage conversions rules stack up against other locations.
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