Adu building — 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 taking a project from initial design through site preparation, framing, and final inspections. You need this service when you are ready to expand your property’s utility. Costs depend on whether you are building a custom structure or converting existing space, as well as local permit fees. Exact pricing confirmed free on the call.
Frequently asked in Berkeley
What does 'affordable accessory dwelling unit' mean in Berkeley?
What does 'accessory dwelling unit' mean?
An 'accessory dwelling unit' (ADU) is a secondary housing unit on a single-family residential lot. It's an independent living space, separate from the main house. ADUs can be attached or detached and offer flexibility for family, guests, or rental income. Berkeley has specific regulations governing their size and placement. We help you navigate these rules.
What are the permit cost considerations for an accessory dwelling unit in Berkeley?
What are the rules for accessory dwelling unit rental in Berkeley?
What types of accessory dwelling unit homes can be built in Berkeley?
What is the best accessory dwelling unit for my needs?
What are prefabricated accessory dwelling units?
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: Gourmet Ghetto, North Berkeley, South Berkeley, West Berkeley, Elmwood — and every surrounding area.
Areas we serve
Browse by state, then city.