Douglas County, CO Accessory Structures: Garage Conversions (2026)
Garage conversion rules in Douglas County, CO, sometimes called garage-to-ADU or accessory living unit conversions, govern permits, ceiling height, egress, and parking replacement.
Key Facts
- Building permit
- Required for conversion
- Off-street parking
- 2 spaces per dwelling kept
- Separate unit
- Treated as an ADU
- Building code
- 2021 IRC applies
- Governing section
- DCZR Section 711 parking
Summary
Douglas County has no garage-conversion-specific ordinance, but converting a garage to habitable or separate living space requires a building permit, must meet the building code, and must keep the required off-street parking. A separate living unit is treated as an ADU and must meet ADU rules.
The minimum off-street parking spaces required: 2 spaces per dwelling. Unlicensed, operable vehicles parked outside shall be concealed by a solid fence, berm, vegetative barrier, or a combination thereof. Inoperable vehicles are prohibited.
Full Breakdown
There is no standalone garage-conversion rule in the Zoning Resolution. Adding habitable space triggers a building permit and 2021 IRC compliance for insulation, egress, and ceiling height. Critically, Section 711 requires a minimum of two off-street parking spaces per dwelling, so a conversion that removes garage parking must replace it on site. If the converted space becomes an independent unit with sleeping, cooking, and sanitation, it is an accessory dwelling unit and must satisfy the ADU standards (one per lot; lot-size minimums for a detached unit). Incorporated towns apply their own municipal codes.
Violations & Fines
An unpermitted conversion or loss of required parking is a code violation subject to permit penalties, correction orders, and possible removal of the improvements.
Frequently Asked Questions
Can I turn my garage into a rental apartment?
Do I lose my required parking if I convert the garage?
Sources & Official References
Other rules in Douglas County
Compare Douglas County to another location·View the Colorado accessory structures overview
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