Home Additions & ADUs
in Antioch, CA

Planning home additions & adus in Antioch? AZ Elevated Builders offers free estimates with a written scope. Our work carries a written warranty of up to five years.

Who offers home additions & adus in Antioch, CA?

AZ Elevated Builders provides home additions & adus in Antioch, California. We are a family-run, licensed and insured general contractor based in Brentwood, serving Antioch and the surrounding Contra Costa County area. Estimates are free, every trade on our crew has 15+ years of experience, and all work carries a written warranty of up to five years. We speak English and Spanish. Call (925) 812-3150.

5.0 Google Reviews ·CA Licensed & Bonded ·Free Estimates ·Warranties up to 5 Years ·Financing Available ·Hablamos Español

Detached ADU guest house with pool at dusk

We design and build primary-suite additions, kitchen expansions, family rooms and second-story additions. Rooflines, windows and finishes are planned to work with the existing house.

An ADU can provide space for family or a rental unit. We handle feasibility, California's ADU requirements, local permitting and utilities through final inspection.

Planning your project in Antioch

We serve Antioch, from Rivertown to the neighborhoods around Lone Tree Way.

The local housing includes everything from pre-war Rivertown cottages to 1970s ranches and 2000s hillside tracts. Some post-war properties have space for an addition or ADU. We assess the lot and any existing garage during the feasibility review.

We serve Antioch, including Rivertown, Lone Tree Valley, Mira Vista Hills and Black Diamond. Project planning here accounts for a mix of river-flat lots downtown and clay hillsides to the south. We assess foundations, drainage and space on the lot when planning an addition or detached unit.

Permits and inspections in Antioch

Permits for work in Antioch go through the City of Antioch Building Inspection Division. Additions and ADUs are the most review-heavy work we do — setbacks, lot coverage, utilities and California's ADU rules all get checked before a shovel moves. We handle the permit application and coordinate inspections.

What's included

Room additions & home extensions
Primary suite & bath additions
Detached & attached ADUs
Garage conversions
Feasibility & permit management
Utility connections & upsizing
Full kitchens & baths in every unit
Finish levels matched to the main house

What to expect

Contact us to schedule a walkthrough in Antioch. We provide free estimates, a written schedule and a warranty of up to five years. Hablamos español.

Frequently asked questions

Are ADUs legal in Antioch?

Yes — ADUs are legal in Antioch. California law requires cities to allow ADUs on most residential lots, and Antioch processes them under those state rules. We confirm setbacks, size limits and utility requirements for your specific parcel during the free feasibility visit.

What does an ADU cost to build?

It varies with size, site and finish level — a garage conversion is a different project than a detached new build. We price it in a written scope after walking your property, and financing options are available.

How long does an addition take?

Design and permitting typically run 2–4 months depending on the city; construction runs 3–6 months for most additions and detached ADUs. We provide a written schedule and keep you updated weekly.