Home Additions & ADUs
in Berkeley, CA

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

Who offers home additions & adus in Berkeley, CA?

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

We offer remodeling services for Berkeley's older homes, with attention to existing materials and current code requirements.

The local housing includes brown-shingle and Craftsman homes, a great many built before 1930. For an addition to a historic home, we review the siding, window proportions and roof pitch to plan compatible details. We also check whether neighborhood design review applies.

We serve Berkeley, including Elmwood, North Berkeley, Claremont and Westbrae. Project planning here accounts for century-old framing, knob-and-tube remnants and strict local review. We assess foundations, drainage and space on the lot when planning an addition or detached unit.

Permits and inspections in Berkeley

Permits for work in Berkeley go through the City of Berkeley Permit Service Center. 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

We review your Berkeley project with you and prepare a written estimate. Financing is available, and our work carries a written warranty of up to five years. Hablamos español.

Frequently asked questions

Are ADUs legal in Berkeley?

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