Custom ADU Builders in Santa Clara & San Mateo Counties

High-quality ADU design & construction delivered with precision, transparency, and award-winning craftsmanship.

25+ Years of Construction Experience

Bringing Silicon Valley precision to every ADU build.

Full Design-Build Firm

Architecture, engineering, project management — all under one roof.

Permit & Compliance Experts

We navigate city requirements in Santa Clara & San Mateo for you.

Building an ADU is one of the smartest ways to increase property value, create additional living space, or generate long-term rental income.
At Dream Builders, we specialize in custom ADU design and construction for homeowners across Santa Clara County and San Mateo County. With over 25+ years of experience, our design-forward team delivers modern, functional ADUs built to California codes — with clear communication, detailed planning, and exceptional craftsmanship from start to finish.

Whether you’re planning a detached ADU, attached ADU, garage conversion, or multi-unit layout, we bring innovation and precision to every project.

ADU Construction Services We Offer

We handle your entire ADU project — concept to completion:

Why Homeowners Choose Dream Builders for ADUs

Transparent Pricing

Clear, itemized estimates with no hidden fees.

High-End Craftsmanship

Premium materials, sustainable building, and modern design principles.

Faster Turnaround Times

Efficient scheduling and expert project management keep your ADU on track.

Custom, Luxury Finishes

Tailored to your style — cabinetry, lighting, smart home, flooring & more.

What Homeowners Are Saying

Dream Builders

5.0

Based on 9 reviews

review us on

dor levy

02:52 10 Feb 26

We had a great experience working with Dream Builders. The team was professional, reliable, and delivered excellent quality work from start to finish. They built a beautiful master suite for us, including a walk-in shower, with great attention to detail. Communication was clear throughout the entire process, and the project was completed on time. Highly recommended for anyone looking for a trustworthy contractor in the Bay Area.

Tal Ohana

17:49 22 Jan 26

I would like to sincerely thank you for the incredible work you did on our kitchen. From the very first meeting to the final result, everything was handled with such professionalism, care, and attention to detail. The design, the quality of the materials, the precision in the execution, and the overall finish exceeded all of our expectations.

The kitchen turned out absolutely perfect — beautiful, functional, and exactly what we had envisioned, and even more. Every detail was thought through, and it truly shows in the final result. We are beyond happy and grateful for the dedication, patience, and effort you put into this project.

Thank you for turning our vision into reality and for creating a space we truly love and enjoy every single day. We highly recommend you to anyone looking for exceptional quality and outstanding service.

Gad Sj

21:38 14 Jan 26

My family and I needed additional space in our home due to a new baby on the way, so we decided to add an extra bedroom. We met with five different contractors to get quotes—two were very low, two were very high, and Dream Builders landed right in the middle, which gave us a great sense of balance and confidence.

From the start, Dream Builders committed to an expedited timeline, and they delivered. The project was completed about three weeks ahead of schedule. The crew worked efficiently, with multiple trades on-site at the same time, which really helped move the project along.

The final result was beautiful. We requested a smooth Level 5 finish (the highest level), and it turned out flawless. The white paint on the walls truly opened up the space, making it feel bright, clean, and spacious. The new en-suite bathroom exceeded our expectations.

Working with Dream Builders was a smooth and pleasant experience throughout the entire process. Communication was clear, professional, and reliable, which made the project feel stress-free from start to finish.

If you’re considering a contractor for an addition or remodel, we highly recommend Dream Builders.

Mario A

23:14 20 Oct 25

I can't say enough good things about Dream builders and Design Inc! Seven months ago, they completed an office build-out for me right in my backyard, and I am absolutely thrilled with the result. The Value quality of their work is exceptional, and the entire project was handled with Value professionalism from start to finish. I highly recommend them for any design and build needs!

Alexander Shavit

04:17 06 Sep 24

Top notch builder . They completed my custom project from A to Z and I didnt really have to lift a finger . My go to builder from now on.

Avi Gingold

15:21 23 Jan 24

Visited Dream Builders in Gilroy and was thoroughly impressed. Their display of modular homes, ADUs, and commercial buildings showcased the quality and attention to detail they put into their work. The commitment to eco-friendly practices was evident, aligning with California’s sustainability standards. The staff was welcoming and informative, providing valuable insights into their process. This visit has definitely put California Modulars at the top of my list for future modular construction needs.

Serving Homeowners Throughout:

Santa Clara County (San Jose, Santa Clara, Sunnyvale, Cupertino, Mountain View, Palo Alto, Milpitas, etc.)
San Mateo County (Redwood City, San Mateo, Daly City, Belmont, San Carlos, Menlo Park, South San Francisco, etc.)

Request a Free Consultation Today!

Ready to Build Your ADU?

Increase your home’s value and create functional, beautiful living space.

Custom ADU Builders in Santa Clara & San Mateo Counties

25+ Years of Construction Experience

Full Design-Build Firm

Permit & Compliance Experts

ADU Construction Services We Offer

Custom ADU Design & Architectural Planning

Detached ADUs (Backyard Units / DADUs)

Attached ADUs & Home Extensions

Garage Conversions

Basement ADUs & Lower-Level Apartments

Prefab / Modular ADU Integration

Full Permitting & Site Surveys

3D Renderings & Virtual Walkthroughs

Plumbing, Electrical & Structural Work

Smart Home & Energy-Efficient Integration