ADU Builders in Colorado
Colorado is the newest of the big ADU markets. HB24-1152 took effect in mid-2025 and requires Denver metro jurisdictions to allow one accessory unit per single-family lot through administrative approval, with HOAs no longer able to ban them outright, and the state added a grant program on top. Supply is still forming, so track records are shorter here and the firms that do specialize stand out clearly. Building also means snow loads, a season that closes early, and mountain lots a crane may struggle to reach. This page covers the Front Range and the resort counties, from Denver and Boulder to Fort Collins and Colorado Springs.
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Licensed general contractor specializing in site-built ADUs across the Western Slope with 10 standard models, transparent fixed pricing, and 90–115 day construction timelines.
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Colorado Springs design-build firm that specializes exclusively in accessory dwelling units, from detached backyard units to garage conversions and in-law suites, with a licensed architectural team and turnkey service.
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Denver-based design-build firm specializing in site-built ADUs with integrated architecture, interior design, permitting, and construction under one team.
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Family-owned Denver design-build firm specializing in full-home remodeling, custom builds, and accessory dwelling units across 19 metro communities, with all-five-star ratings across major platforms.
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Custom design-build ADUs across Northern Colorado and Southeast Wyoming, with expertise in passive house construction and sophisticated architectural details. No fixed models; each project is tailored to the site and homeowner vision.
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Denver-based design-build firm specializing in high-performance custom homes, ADUs, additions, and pop-top renovations with emphasis on energy-efficient construction and responsible material selection.
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Castle Rock design-build contractor operating for over 20 years, specializing in ADU construction including detached units, garage conversions, and attached suites across Douglas County with full design and permitting.
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Fruita-based design-build firm founded in 2003, combining architectural expertise with on-site construction to deliver energy-efficient custom homes and ADUs for the Grand Valley and surrounding communities.
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Revo Renovations' ADU-focused division specializing in site-built accessory dwelling units for Denver County homeowners, handling zoning, design, permits, and construction from start to finish.
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Durango-based builder founded by Colorado State University graduate Casey Lafferty, specializing in custom homes and ADUs with 15+ years of hands-on experience and a commitment to jobsite presence.
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Denver and Boulder design-build firm specializing in luxury home renovation, additions, and custom ADUs with integrated architecture, engineering, and construction.
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Stick-built ADU specialist founded by a Registered ADU Specialist, serving the Denver metro and Colorado Front Range with four pre-designed models ranging from studio to two-bedroom and custom design-build services.
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Colorado-based site-built contractor serving 12 locations including Colorado Springs, Monument, Castle Rock, and rural mountain areas, offering ADU construction alongside custom homes and major remodels with 10-plus years of experience.
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Denver-based turnkey ADU design-build firm offering in-house financing assistance, four-step construction process, and custom designs tailored to existing home architecture.
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Northern Colorado remodeling and construction firm specializing in ADU conversions and new builds over 25 years. Offers garage conversions, detached structures, and mother-in-law suites across a wide service area.
Frequently asked questions
What kind of ADU options are available in the Denver metro area?
You can find several design-build firms in the Denver area that handle everything from full-home remodeling and custom additions to specialized site-built accessory units. Some companies offer pre-designed models while others focus on luxury renovations and integrated architectural services.
Are there builders who specialize in energy-efficient or high-performance ADUs?
Yes, several Colorado builders focus on sustainability. You can choose from firms specializing in passive house construction, energy-efficient custom builds, or high-performance homes that emphasize responsible material selection.
Can I find a builder for a garage conversion or an attached suite?
Many design-build firms in Colorado specialize in various unit types including detached backyard units, garage conversions, and attached in-law suites. These professionals often manage the entire process from initial design through permitting and construction.
I live outside of Denver. Are there builders serving the Western Slope or Northern Colorado?
There are several options for homeowners outside the metro area. You can find specialists serving the Western Slope and Grand Valley, builders focused on Northern Colorado, and custom builders operating in the Durango area.
Do I have to deal with my HOA to build an ADU in Colorado?
Recent legislation like HB24-1152 has changed the landscape for Denver metro jurisdictions. The law now requires these areas to allow one accessory unit per single-family lot through administrative approval and prevents HOAs from banning them outright.