Design-build home additions in the Bay Area — one team from first sketch to final walkthrough.
New Bay Builders is a design-build remodeling firm (CSLB #1057737) serving Contra Costa, Alameda, and Marin counties since 2019. From room additions to second stories, our in-house team designs and builds new space that looks like it was always part of your home.
Every project starts with a free consultation and is documented in a detailed written scope — so you know exactly what’s included before we begin. And every addition we build is backed by our 1-Year Warranty.
Every addition is different. A typical scope with New Bay Builders may include:
Your exact scope is documented in a detailed written proposal before work begins — no surprises.
A clear path from first conversation to final walkthrough.
Tell us about the space you need in a free consultation.
We design the addition to match your home’s style.
You receive a detailed written scope and quote.
Our team builds your addition with permits handled.
We walk through every detail together before sign-off.
Addition projects across the Bay Area — including this second-story addition in Redwood City.
Yes. Every project starts with a free consultation — at your home or in our Alameda showroom at 2515 Santa Clara Ave, Suite 207 (by appointment).
Yes. You’ll receive a detailed written scope and quote so you know exactly what’s included before construction starts.
Yes. Every project is backed by our 1-Year Warranty.
Yes — financing is available. Ask us about options during your free consultation.
Proudly serving 44 cities across Contra Costa, Alameda & Marin counties — see our Areas We Serve.
