⚡ Quick Answer for Denver
ADUs — garage conversions, backyard cottages, in-law suites — always require permits. Many states have streamlined the process. Denver offers online permit applications for residential projects. Colorado's altitude and climate mean snow load and energy code requirements apply. Denver has seen rapid population growth, creating higher building department demand and sometimes longer processing times.
$1,200Fee (Low End)
$5,000Fee (High End)
$2,500Typical Fee
VariesProcessing Time
Denver Building Department
When Is a ADU Permit Required in Denver?
A permit is typically required when:
- Converting a garage to living space
- Building a detached backyard cottage
- Adding a basement apartment
- Any separate dwelling unit on your property
When Is a Permit NOT Required?
- There are no exemptions for ADUs — all habitable units require permits
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ADU Permit Costs in Denver
| Cost Factor | Details for Denver |
|---|
| Typical permit fee range | $1,200–$5,000 |
| Most common fee | $2,500 |
| Cost tier | Near national average |
| Additional permits | Electrical, plumbing, or mechanical permits may be required separately |
| Plan review fee | May be charged separately for complex projects |
Contact Denver Community Planning and Development directly for current, exact fee schedules.
How to Get a ADU Permit in Denver
- Check requirements — Visit Denver Community Planning and Development to confirm current requirements for your specific project.
- Prepare documents — Gather site plans, project drawings, and any required documentation.
- Submit your application — Most Denver permits can be submitted online through the city portal.
- Pay the permit fee — Expect to pay $1,200–$5,000 for a typical adu permit in Denver.
- Schedule inspections — Your permit will specify required inspection stages. Call to schedule after each phase.
- Get final approval — After all inspections pass, your work is on the official record and compliant.
Frequently Asked Questions
Do I need a adu permit in Denver, CO?
ADUs — garage conversions, backyard cottages, in-law suites — always require permits. Many states have streamlined the process. In Denver: Denver offers online permit applications for residential projects. Colorado's altitude and climate mean snow load and energy code requirements apply. Denver has seen rapid population growth, creating higher building department demand and sometimes longer processing times.
How much does a adu permit cost in Denver?
ADU permit fees in Denver typically range from $1,200–$5,000, with most projects around $2,500. Contact Denver Community Planning and Development directly for exact current fees, as they can change year to year.
How do I apply for a adu permit in Denver?
Apply through Denver Community Planning and Development at https://www.denvergov.org/Government/Agencies-Departments-Offices/Building-and-Fire-Life-Safety. Most projects can be submitted online. You'll need project plans or drawings, property information, and payment for the permit fee.
What happens if I build without a permit in Denver?
Building without a required permit in Denver can result in fines, stop-work orders, required demolition, and complications when selling your home. Always verify requirements before starting any project.
Other Cities Near Denver
Compare adu permit requirements in nearby cities:
Aurora · Colorado Springs
Other Permit Types in Denver
Need a different permit in Denver?
Shed Permit · Deck Permit · Fence Permit · Roof Permit · HVAC Permit · Electrical Permit · Plumbing Permit · Addition Permit
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Licensed local contractors know your city's permit requirements and handle the paperwork for you. Get free quotes in minutes.
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