Garage conversion rules in Centennial, CO — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Centennial permits garage conversions as a form of ADU under its 2024 ADU ordinance and Colorado HB 24-1152. Conversions require building permits and must meet residential code including 7'6" ceiling height. Under state law, cities should not require replacement parking for garage-to-ADU conversions.
Centennial allows garage conversions as a type of accessory dwelling unit under its 2024 ADU ordinance and Colorado HB 24-1152. Conversions require a building permit and must meet residential building code standards including minimum 7-foot 6-inch ceiling height, proper insulation, HVAC, egress windows, and fire separation from the main dwelling. Under state ADU guidance, municipalities should not require replacement parking when a garage conversion eliminates off-street parking. The converted space should have a separate entrance, preferably on the side or rear of the property. Ceiling height is a common challenge in garages with drop beams or HVAC ducts. HOA approval may be required in covenant-controlled communities.
Conversion without permit: building code violation. Occupying non-code-compliant space: safety violation with potential red-tag.
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Side-by-side rule comparisons with other cities in Arapahoe County.
See how other cities in Arapahoe County handle garage conversions.
See how Centennial's garage conversions rules stack up against other locations.
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