Accessory dwelling unit services — 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
Frequently asked in Boulder
What is the cost of an accessory dwelling unit in Boulder?
Who is an ADU builder in Boulder?
Are there homes with mother-in-law suites in Boulder?
What are the best accessory dwelling units in Boulder?
What is ADU construction like in Boulder?
What are detached accessory dwelling units in Boulder?
What are prefab ADUs 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: University Hill, Downtown Boulder, Newlands, Gunbarrel, Table Mesa — and every surrounding area.
Areas we serve
Browse by state, then city.