
How Much Does It Cost to Build an ADU in California?
ADU in California costs roughly $120,000 to $450,000+. See what drives the price, permit fees, and how to compare contractor bids.
Heads up: Oliebids is a new platform. We're building our network of homeowners and contractors, so some listings shown are samples until real jobs go live in your area.
Launch updates, contractor playbooks, and homeowner guides from the team.

ADU in California costs roughly $120,000 to $450,000+. See what drives the price, permit fees, and how to compare contractor bids.

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