Number 1: Rockymtn Adus
on GoogleDenver
Rocky Mountain ADUs builds accessory dwelling units in the Denver area.
ADU builders in Denver
The 6 ADU builders from Google's results for Denver, Colorado, ordered by Google rating weighted by review count. No firm pays to be listed or ranked.
Last updated
- Garage conversion ADU
- $62,000 – $154,500existing structure
- Detached ADU
- $154,500 – $412,000new build, utilities
- Prefab ADU
- $123,500 – $309,000unit, foundation, install
- Denver vs US
- +3%around the US median
Licensing in Colorado. Colorado has no state license for general contractors or remodelers. Denver and most other cities license contractors locally.
Number 2: Denver Custom ADU
on GoogleWheat Ridge, CO
Denver Custom ADU builds accessory dwelling units in the Denver area from Wheat Ridge, Colorado.
(303) 806-0123 10790 W 50th Ave #600, Wheat Ridge, CO 80033
Number 3: Reid Building Group
on GoogleDenver, CO
Reid Building Group is a Denver design-build contractor that plans and constructs accessory dwelling units. Its process covers feasibility, zoning and property constraints, design, permitting, utility and plumbing planning and construction sequencing, for both new detached structures and conversions of existing space.
(303) 501-9233 1294 S Bannock St, Denver, CO 80223
Number 4: Little Home Builder
on GoogleLongmont, CO
Little Home Builder builds accessory dwelling units in the Denver area from Longmont, Colorado.
(720) 339-3509 12509 Lk Pt Ct, Longmont, CO 80504
Number 5: ADU 5280
on GoogleDenver, CO
ADU 5280, run by Revo Renovations, designs and builds backyard accessory dwelling units in Denver. The team also remodels kitchens, bathrooms, garages, basements and entire houses, and offers design-build services for new construction with architects, engineers and subcontractors.
(303) 653-7325 2135 S High St, Denver, CO 80210
Number 6: ADU Construction Aurora & Denver CO
Denver
AFL Colorado is a general contractor in Denver and Aurora that takes on home improvement work, including accessory dwelling unit construction.
What ADU builders charge in Denver
In Denver, a garage conversion ADU typically costs $62,000 – $154,500. Remodeling labor in Denver runs about 3% above the US median, which accounts for most of the difference from the same project elsewhere.
How to choose between them
- Check the license yourself. Where Colorado or Denver licenses this work, the licensing board's own lookup confirms a license number in a minute. Do it before you sign, not after.
- Get three bids on the same scope. Written down, split into labor, materials, allowances and anything structural. Most people compare a total against a total and end up choosing between two different projects.
- Ask what is not included. Permits, debris removal, fixture and finish allowances, and repairs after demolition are the four that turn a cheap bid into an average one.
- Never pay a large deposit up front. A deposit to order materials and hold a start date is normal. Half the total before anyone shows up is not.
How this list is ordered
These are the firms from Google's results for "adu builders denver", with directories, chains and suppliers removed. They are ordered by Google rating weighted by review count, and the ratings shown are Google's. No firm pays to be listed or ranked. The list was last updated in October 2026.
ADU builders in Denver: common questions
Can I build an ADU on my lot?
It depends on your city and state. California, Oregon and Washington have state laws that make ADUs allowed on most single-family lots. Elsewhere it is set by local zoning, so check lot size, setback and owner-occupancy rules with your city first.