Get In Touch With our Colorado ADU Experts
Have questions about building an ADU in Colorado? Whether you’re navigating local zoning laws, evaluating your lot’s eligibility, or comparing detached, attached, or conversion options, our team is here to guide you every step of the way. Contact us today to schedule your free consultation and discover what’s possible for your property.
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FAQs
Common Questions About ADUs
What is the difference between a tiny home and an ADU?
In Colorado, the difference comes down to permanence and the building code. An ADU (Accessory Dwelling Unit) is a permanent structure built on a foundation that complies with the International Residential Code (IRC). A “tiny home” is often built on wheels; under Colorado law, those are typically classified as RVs and face stricter “length of stay” limits in cities like Denver or Boulder. For a tiny home to be considered a legal ADU in Colorado, it generally must be removed from its wheels and attached to a permanent foundation.
Can I put an ADU on my property in Colorado?
Almost certainly yes if you live in an urban or suburban “subject jurisdiction.” Thanks to Colorado’s HB24-1152, most cities along the Front Range are now required to allow at least one ADU on any lot with a single-family home. Furthermore, the law now prevents many HOAs from flat-out banning ADUs, though they can still enforce “reasonable” design standards.
Do I need to live on the property?
How to build an ADU in Colorado?
The process has been streamlined by new state mandates:
Zoning Check: Verify your local setbacks—state law now protects your right to build units between 500–750 sq. ft. in most areas.
Administrative Approval: Most Colorado cities must now use a “by-right” approval process, meaning no public hearings or neighbor notifications are required.
Utility Planning: You’ll need to coordinate with providers like Denver Water or Colorado Springs Utilities regarding “tap fees” and connection points.
Construction: We handle the build, ensuring your ADU is insulated for Colorado winters and meets all local fire and safety codes.
How much does an ADU cost to build?
In Colorado, custom ADU construction typically ranges from $160,000 to $350,000+. Factors unique to our state—such as the need for deep footings due to the frost line and the high cost of local “tap fees” for water and sewer—contribute to the total. Garage conversions remain the most affordable entry point, starting around $80,000–$120,000.
Can I build an ADU on any property?
Most single-family lots in California are eligible. We’ll evaluate your property’s zoning, setbacks, and utility access during your free consultation.
Is it cheaper to build an ADU or buy a prefab ADU?
Prefab is often cheaper for the structure itself, but the total project cost can be similar to a site-built unit. While a factory-built “modular” unit can save 10–15% on labor and protect materials from Colorado’s unpredictable weather, you still have to pay for the foundation, utility trenching, and crane rental. Many Colorado homeowners choose site-built ADUs because they are easier to customize to match the “Mountain Modern” or “Denver Square” aesthetic of the main house.