Accessory dwelling unit builders — Boulder, CO
Last updated: September 24, 2026
What affects the price
Building an ADU involves variables that shift your total investment. The footprint size and complexity of the architectural design are primary factors. Are you planning a detached unit that requires new utility trenching, or is this a garage conversion that uses existing plumbing? Site accessibility, soil conditions, and your choice of finishes—like luxury flooring versus standard options—also play significant roles. Permitting fees vary widely depending on your local municipality and current zoning requirements. Exact pricing confirmed free on the call.
About this service
These are the professionals responsible for managing your project from start to finish. A good builder handles the trades, material orders, and inspections so you don't have to coordinate multiple contractors. Costs for these services typically fluctuate based on the size of the team and the complexity of the design. You need builders when you want an experienced partner to take your project from the initial concept to the final inspection. Exact pricing confirmed free on the call.
Frequently asked in Boulder
What is the process for accessory dwelling unit construction in Boulder?
What ADU services are available in Boulder?
What is ADU housing?
ADU housing refers to secondary, independent living units built on a single-family residential lot. These units are designed to be self-sufficient with their own kitchen, bathroom, and sleeping area. ADUs can be attached to the main house or be a separate structure. They provide flexible living solutions for homeowners. The pros can explain how they apply to your situation.
What's the process for ADU construction in Boulder?
How do I find an ADU builder in Boulder?
What ADU estimate can I get in Boulder?
What is an accessory dwelling unit (ADU)?
An accessory dwelling unit (ADU) is a secondary, independent living space on a single-family home lot. It has its own kitchen, bathroom, and sleeping area. ADUs can be attached to the main house or be a separate structure. They offer flexible living solutions for homeowners. The pros can explain how they apply to your situation.
Also serving nearby: Longmont · Westminster · Arvada · Thornton · Lakewood
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Boulder — population 105,898; about 3,937 residents per square mile across 26.9 sq mi. ZIP codes covered include 80301, 80302, 80303, 80304, 80305, 80306, 80307, 80308.
Neighborhoods served in Boulder: Downtown Boulder, University Hill, Newlands, Gunbarrel, Table Mesa — and every surrounding area.
Areas we serve
Browse by state, then city.