Home Additions & ADUs
East Bay & Beyond
Home additions and ADUs, from feasibility and permits through construction. Based in Brentwood and serving a 60-mile radius across Contra Costa, Alameda, San Joaquin, Solano and Napa counties.
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.
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
Where we offer home additions & adus
Frequently asked questions
Are ADUs legal in the East Bay?
Yes — ADUs are legal in the East Bay. California law requires cities to allow ADUs on most residential lots, and the East Bay 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.
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