Home Additions & ADUs
in Walnut Creek, CA

We offer home additions & adus in Walnut Creek, Contra Costa County. Our family-run crew is based in Brentwood, with 15+ years of experience in each trade.

Who offers home additions & adus in Walnut Creek, CA?

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

We provide remodeling, concrete and finish work for Walnut Creek homes.

The local housing includes 1950s–70s ranches, mid-century customs and newer downtown infill. 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 Walnut Creek, including Rossmoor, Northgate, Walnut Heights and Downtown Walnut Creek. We also cover neighboring Saranap. These unincorporated areas handle permits through Contra Costa County. Project planning here accounts for valley floor and oak-covered hillside lots with mature tree protection rules. We assess foundations, drainage and space on the lot when planning an addition or detached unit.

Permits and inspections in Walnut Creek

Permits for work in Walnut Creek go through the City of Walnut Creek 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

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

Frequently asked questions

Are ADUs legal in Walnut Creek?

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