Room Addition Permit Requirements in Denver, CO
Denver uses Denver Building and Fire Code (based on 2021 I-Codes with amendments). High altitude (5,280 ft) affects HVAC sizing. 30 psf ground snow load. Radon-resistant construction required. Green Building Ordinance for large buildings. ADUs allowed citywide. Email: development.services@denvergov.org
By Joey, Founder · Last verified May 15, 2026 · How we research →
When you need a Addition permit in Denver
Additions require permits.
Large additions require comprehensive permitting.
Multi-story additions require comprehensive permitting.
Room Addition Permit Costs: Denver vs. Nearby
Denver's fees are right in line with the Colorado average, $400 – $5,000 versus $460 – $2,310 statewide.
| City | Estimated Fee |
|---|---|
| Denver | $400 – $5,000 |
| Colorado Springs | $300 – $5,000 |
| Aurora | $360 – $4,500 |
| Fort Collins | $300 – $5,000 |
Fees shown are estimates based on local building code data. Actual fees may vary based on project scope and valuation. See all Denver permit costs →
Real Room Addition Permit Data for Denver
From our own dataset of permits filed in Denver over the last 3 years.
Most-active contractor: Home Owner with 118 permits filed.
These figures reflect actual permits issued in Denver, not state averages or estimates. Your project may differ based on scope, valuation, and the specific work proposed.
Who's pulled permits near you in Denver?
We track 29,365 real permit records from Denver. Check what's been filed at any address, useful for buyers vetting a listing or neighbors curious about ongoing work.
Zoning & HOA Considerations
Room additions typically require zoning review for setbacks, height limits, and lot coverage. Your addition must comply with your zoning district's building envelope requirements.
If you live in an HOA community: room additions almost always require HOA architectural review approval. HOAs may restrict the size, style, materials, and exterior appearance of additions to maintain neighborhood consistency.
Estimated Project Timeline in Denver
Here's a typical timeline for a room addition project in Denver, CO:
Timeline is based on Denver's typical about 6 weeks permit processing time. Actual timelines vary by project complexity, completeness of application, and current department workload.
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Frequently Asked Questions
Estimated permit fees for Room Addition projects in Denver, CO range from $400 – $5,000. Fees vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller Room Addition projects may be exempt from permit requirements, while larger ones typically require a permit. Use our free lookup tool to check your specific situation.
Working without a required permit in Denver can result in fines, stop-work orders, being required to remove completed work, and complications when selling your home. It's always best to check first.
Typical approval time for Room Addition permits in Denver is about 4 weeks. More complex projects may take longer if plan review is required.
If you live in an HOA community, you may need architectural review approval in addition to a building permit. HOA rules and city building codes are separate, you may need to satisfy both. Review your CC&Rs and submit to your HOA's architectural review committee before starting work.
Learn More About Room Addition Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read Room Addition Guide →