Cost to build accessory dwelling unit — Concord, CA
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
The expense of building an ADU varies based on site preparation, whether you need to run new sewer or electrical lines, and the level of interior customization you choose. Larger custom builds naturally require more materials and labor than simpler conversions. We provide exact pricing confirmed free on the call.
Frequently asked in Concord
What are the best ADU options for Concord homeowners?
Can I get an ADU permit in Concord easily?
What is the cost of an ADU in Concord?
What kind of ADU building services are available in Concord?
Are there ADU companies that serve Concord?
What are the rules for ADU construction in Concord?
What is considered the best ADU for property owners?
Also serving nearby: Antioch · Vallejo · Berkeley · Oakland · Richmond
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Concord — population 122,315; about 4,001 residents per square mile across 30.6 sq mi. ZIP codes covered include 94518, 94519, 94520, 94521, 94522, 94524, 94527, 94529.
Neighborhoods served in Concord: Downtown Concord, Willow Pass, Clayton Valley, Pleasant Hill border areas — and every surrounding area.
Areas we serve
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