ADUs

ADU Permits in Contra Costa County: A Plain-English Guide

California ADU laws have changed dramatically. Here's what's allowed in 2026 — and how to actually build one.

April 30, 2026 · ADUs

California ADU laws have changed dramatically. Here's what's allowed in 2026 — and how to actually build one.

Every Bay Area home is different, and so is every project. Our team has spent the last three decades building, remodeling, and refining homes across Contra Costa County, and the lessons we share on this blog come straight from the job site — not a stock template.

What goes into a project like this

A great remodel is part design, part planning, and part execution. We start with a free on-site consultation, build a clear and itemized scope, pull every required permit, and assign one project manager who stays with you from demolition to final walkthrough.

Why homeowners choose UCI

We're family-owned, third-generation, and fully in-house. That means no surprise subs, no surprise costs, and no surprise schedules — just craftsmanship you can trust, backed by 30+ years of work in your neighborhood.

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Family-owned, 3rd-generation craftsmanship — backed by 30+ years of work across Contra Costa County and the SF Bay Area.