Cost to build accessory dwelling unit — Berkeley, CA
Last updated: September 24, 2026
What affects the price
Building an ADU is a major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.
About this service
Building an ADU involves costs for permits, site prep, foundation, framing, plumbing, and electrical work. Prices fluctuate based on whether you choose a custom design or a pre-planned layout, as well as the complexity of connecting to existing city utilities. Exact pricing confirmed free on the call.
Frequently asked in Berkeley
What are the requirements for a backyard accessory dwelling unit in Berkeley?
Are there accessory dwelling unit permits required in Berkeley?
Where can I find an accessory dwelling unit contractor in Berkeley?
What are the options for accessory dwelling unit financing in Berkeley?
Where can I find accessory dwelling unit builders near me in Berkeley?
What is involved in accessory dwelling unit construction in Berkeley?
What are the local ADU options in Berkeley?
Also serving nearby: Richmond · Oakland · Daly City · Vallejo · Concord
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Berkeley — population 118,962; about 11,403 residents per square mile across 10.4 sq mi. ZIP codes covered include 94701, 94702, 94703, 94704, 94705, 94707, 94708, 94709.
Neighborhoods served in Berkeley: Elmwood, Gourmet Ghetto, North Berkeley, South Berkeley, West Berkeley — and every surrounding area.
Areas we serve
Browse by state, then city.