Basement Finishing 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
When you DO need a permit
Finishing a basement requires permits in Denver, CO. Radon mitigation system required.
Estimated fee: $200 – $800
Typical timeline: About 3 weeks
Source: Denver Building and Fire Code (2021 I-Codes with amendments)
Adding a basement bathroom requires permits in Denver, CO.
Estimated fee: $300 – $1,200
Typical timeline: About 3 weeks
Source: Denver Building and Fire Code (2021 I-Codes with amendments)
Adding basement egress requires a permit in Denver, CO.
Estimated fee: $150 – $500
Typical timeline: About 2 weeks
Source: Denver Building and Fire Code (2021 I-Codes with amendments)
Adding a basement bedroom requires permits in Denver, CO.
Estimated fee: $250 – $900
Typical timeline: About 3 weeks
Source: Denver Building and Fire Code (2021 I-Codes with amendments)
Finished basements used as living space may trigger zoning occupancy requirements, especially if adding a bedroom or creating a separate dwelling unit.
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Frequently Asked Questions
Estimated permit fees for Basement Finishing projects in Denver, CO range from $200 – $800. Fees vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller Basement Finishing 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 Basement Finishing permits in Denver is About 3 weeks. More complex projects may take longer if plan review is required.
Learn More About Basement Finishing Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read Basement Finishing Guide →