Adu construction — 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
This is the active process of turning your plans into a finished, livable space. It includes site excavation, plumbing, electrical work, and interior build-out. You need professional construction services to ensure the work is safe, up to code, and properly permitted. Costs vary based on labor rates, material quality, and the specific requirements of your site foundation. Exact pricing confirmed free on the call.
Frequently asked in Boulder
What's the process for an ADU unit in Boulder?
Are prefab ADUs a good option for Boulder?
What does accessory dwelling unit construction involve in Boulder?
Can I get an ADU quote for Boulder?
What is an emergency ADU in Boulder?
What does 'accessory dwelling unit' mean in Boulder?
In Boulder, an accessory dwelling unit (ADU) is a secondary housing unit on a single-family lot. It's a smaller, independent living space that can be attached to or detached from the main house. ADUs are designed to provide additional housing options for family or renters and add value to your property.
Do I need an ADU permit in Boulder?
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: Newlands, Mapleton Hill, Chautauqua, Whittier, Gunbarrel — and every surrounding area.
Areas we serve
Browse by state, then city.