Home Additions & ADUs
in Clayton, CA

AZ Elevated Builders provides home additions & adus in Clayton. We're a family-run, CA-licensed contractor based in Brentwood. Contact us for a free on-site estimate.

Who offers home additions & adus in Clayton, CA?

AZ Elevated Builders provides home additions & adus in Clayton, California. We are a family-run, licensed and insured general contractor based in Brentwood, serving Clayton 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 Clayton

Our Clayton services include kitchen remodeling, outdoor living and exterior updates.

The local housing includes 1970s–90s custom and semi-custom homes on generous lots. Newer lots can be compact and may require HOA architectural review alongside city permits. We consider both during design.

We serve Clayton, including Oakhurst, Peacock Creek, Regency Woods and downtown Clayton. Project planning here accounts for Mt. Diablo foothill slopes and wildland-urban interface fire requirements. We assess foundations, drainage and space on the lot when planning an addition or detached unit.

Permits and inspections in Clayton

Permits for work in Clayton go through the City of Clayton Building 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

For your Clayton project, we provide a free estimate and a written scope before work begins. You'll have one point of contact throughout the job and a written warranty of up to five years. Hablamos español.

Frequently asked questions

Are ADUs legal in Clayton?

Yes — ADUs are legal in Clayton. California law requires cities to allow ADUs on most residential lots, and Clayton 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.