Colorado ADU Laws & Permit Guide (2026)
Colorado passed statewide ADU legislation in 2024, requiring most municipalities to allow ADUs. Denver has an established ADU program with dedicated permitting resources.
Colorado ADU At a Glance
Permit Timeline
90–150 days
Average Build Cost
$130,000 – $280,000
Maximum Size
Varies by city (Denver: up to 1,000 sq ft detached)
Owner-Occupancy Required
Not required under HB 1152 (2024)
Impact Fees
Varies by city
Setbacks
Varies; Denver requires 5 ft rear setback
Recent Law Changes in Colorado
Required most Colorado municipalities to allow at least one ADU on single-family lots and prohibited owner-occupancy requirements.
ADU Financial Returns in Colorado
💰 Rental Income Potential
ADU rental income in Colorado varies by location, size, and market conditions. Research comparable rentals in your area to estimate realistic monthly income.
View Complete Rental Income Guide →📊 Calculate Your ROI
Use our free calculator to analyze your ADU investment potential. Input your Colorado project costs and estimated rental income.
Use Free ROI Calculator →📈 Investment Considerations for Colorado
Factors That Increase ADU Value:
- • Separate entrance and utilities
- • Proximity to transit and job centers
- • Two bedrooms vs. studio layout
- • Dedicated parking space
- • Private outdoor area
Colorado-Specific Advantages:
- • Growing ADU acceptance
- • Estimated construction cost: $130,000 – $280,000
- • Typical timeline: 90–150 days
- • Max ADU size: Varies by city (Denver: up to 1,000 sq ft detached)
Find ADU Contractors in Colorado
Browse vetted builders, architects, permit expediters, and ADU lenders serving Colorado homeowners.
Browse Colorado Contractors →Frequently Asked Questions — ADUs in Colorado
Does Colorado require cities to allow ADUs?
Yes. HB 1152 (2024) requires most Colorado municipalities to allow ADUs on single-family lots and prohibits local owner-occupancy requirements.
How much does it cost to build an ADU in Colorado?
Colorado ADU costs typically range from $130,000 to $280,000 for a detached unit. Denver tends to run on the higher end. The state's ADU Finance Program offers low-interest loans for income-eligible homeowners.
Sources
Disclaimer: The information on this page is provided for general informational purposes only and does not constitute legal, financial, or construction advice. ADU regulations change frequently — always verify current rules with your local planning department and consult a licensed professional before making decisions. ADUHomeResource.com is not liable for any errors, omissions, or outcomes resulting from use of this information.