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
When you DO need a permit
Additions require permits in Denver, CO.
Estimated fee: $400 – $1,200
Typical timeline: About 4 weeks
Source: Denver Building and Fire Code (2021 I-Codes with amendments)
Large additions require comprehensive permitting in Denver, CO.
Estimated fee: $800 – $4,000
Typical timeline: About 6 weeks
Source: Denver Building and Fire Code (2021 I-Codes with amendments)
Multi-story additions require comprehensive permitting in Denver, CO.
Estimated fee: $1,000 – $5,000
Typical timeline: About 6 weeks
Source: Denver Building and Fire Code (2021 I-Codes with amendments)
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.
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Frequently Asked Questions
Estimated permit fees for Room Addition projects in Denver, CO range from $400 – $1,200. 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.
Learn More About Room Addition Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read Room Addition Guide →