A garage conversion is usually the lowest-cost path to an ADU in Denver — $70,000-$160,000, versus $140,000-$280,000 for a new detached build — because the shell already exists.
Garage Conversion Cost in Denver
Converting an existing garage in Denver runs $70,000-$160,000. That's well under the $140,000-$280,000 typical cost of a ground-up detached ADU, because you're reusing the foundation, walls, and roof. The biggest variables are whether the slab and framing are sound, what utility/electrical upgrades are needed, and your finish level. Permit fees add $500-$5,000 building permit + $2,055-$3,030 Denver Water SDC; total permit/utility typically $7K-$13K. A converted unit rents for about $1,400-$1,900/mo (1BR) in Denver.
The Denver Garage Conversion Permit Process
A garage-to-ADU conversion in Denver needs building permits even if the exterior is unchanged. Approval process: Administrative (by-right) approval — no public hearing The review timeline is 4-7 months realistic from application to issued permit (zoning + building review), with plan check: Several weeks to a few months depending on backlog. Pre-approved plans: Pre-approved/standard plan options available.
- Confirm eligibility — ADUs are allowed in All zones that allow a single-family dwelling (citywide as of CB24-1303, effective Dec 16, 2024).
- Prepare conversion plans — layout, egress windows, insulation, ventilation, smoke/CO detectors, plus a kitchen and bathroom.
- Submit for plan check — Several weeks to a few months depending on backlog.
- Pull permits and build — fees run $500-$5,000 building permit + $2,055-$3,030 Denver Water SDC; total permit/utility typically $7K-$13K; then framing, electrical, plumbing, and final inspection.
Parking Rules for a Garage Conversion
Not required (no parking minimum for ADUs per HB24-1152 / CB24-1303) Garage conversions sometimes trigger different parking rules than new detached ADUs, so confirm replacement-parking requirements with Denver before you start. Owner-occupancy is not required, so you can rent the converted unit out.
The JADU Option for an Attached Garage
If your garage is attached to the house, you can convert it into a junior ADU (JADU) — capped at Confirm with Denver CPD (Denver regulates ADUs, not a separate JADU category) and built within the existing walls. JADUs are cheaper and faster to permit than a full ADU, though they may share sanitation with the main home. A full ADU gives you more size and a separate unit; a JADU is the budget route.
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Denver Garage Conversion FAQ
How much does a garage conversion cost in Denver?
Do I need a permit to convert a garage in Denver?
Do I have to replace the parking if I convert my garage in Denver?
How long does a garage conversion take in Denver?
Can I convert an attached garage into a JADU in Denver?
Compare your options: see the full Denver ADU rules, estimate your build with the Denver ADU cost calculator, or read the general garage conversion guide.