Top 9 ADU Construction Companies in Cupertino, CA
Compare the most trusted accessory dwelling unit contractors in Cupertino to find the right fit for you
Cupertino sits at the center of Santa Clara County, bordered by Silicon Valley’s most expensive zip codes and one of the tightest housing markets in the country.
With rental demand consistently high and property values that reward smart investment, accessory dwelling units have become one of the most practical ways to expand living space or generate income without leaving your lot. Whether you’re planning a backyard cottage for a family member, a rentable in-law suite, or a garage conversion, finding a builder who genuinely knows Cupertino’s permitting process and zoning requirements makes a substantial difference in how quickly and cleanly your project gets done.
1. MA Legacy Remodeling
MA Legacy Remodeling, operating as MA Legacy ADU Construction & Remodeling, is the top recommendation on this list for Cupertino homeowners. We are a locally rooted team that specializes in ADU construction and home additions across Cupertino and the surrounding Silicon Valley area, and we bring hands-on knowledge of the city’s permit requirements, zoning regulations, and site-specific constraints to every project we take on.
We handle attached ADUs, detached ADUs, and garage conversions, managing each phase from initial design through final city inspection. Our design-build structure means the same team that plans your unit is the same team that builds it, which eliminates the back-and-forth that comes with hiring an architect and a contractor separately.
What sets us apart in this market is our focus on larger-scale residential work. We take on the scope that many generalists avoid, and we bring the experience to match. Cupertino homeowners looking for a builder who treats their ADU as a serious construction project, not an afterthought, will find a strong match with our team.
Reviews title
S
Name
L
Name
View our ADU work and get the conversation started today, call us at (408) 545-8413 or contact us here.
2. Acton ADU
Acton ADU out of Campbell has been building ADUs in the Bay Area for over 35 years, with Cupertino explicitly listed as one of their service cities. Founded by Stan Acton, the company focuses entirely on ADU work, offering end-to-end service from feasibility review and design through permitting and construction. Their pre-approved floor plans and curated finish packages help streamline decisions, though they are also set up for more custom builds.
Acton has developed a strong reputation for navigating the more restrictive permitting environments in the area, including cities like Cupertino, Los Altos, and Saratoga. Their model lineup spans studio to two-bedroom units, all site-built to California residential standards.
name
review
name
3. Greenberg Construction
Based in Palo Alto, Greenberg Construction is a licensed design-build firm (CA License #996834) with Cupertino explicitly in their service area. They handle custom homes, home additions, and ADU construction across the Bay Area, operating with in-house architecture, permitting, and construction teams. CEO Maor Greenberg built the company on a full-service model, meaning clients work with one team from concept to completion rather than coordinating between separate architects and contractors.
They carry an Inc. 5000 designation, eight Best of Houzz Service awards, and a BuildZoom score in the top 1% of California contractors. The team builds detached and attached ADUs and is well-versed in Santa Clara County’s requirements.
name
review
name
4. Ingenuity Construction Group
Ingenuity Construction Group is a Bay Area firm owner-operated by Edgar Fernandes with over 20 years serving the Cupertino area. They offer a broad range of residential construction services, with ADU construction as a clearly defined offering that includes design, permitting, and full build. Their team references specific knowledge of Cupertino’s building codes and has established relationships with local subcontractors and permit officials.
The company builds attached, detached, and garage conversion ADUs, working through a structured process from initial consultation to final walkthrough. They serve Santa Clara, San Mateo, and Alameda counties.
name
review
name
5. Fields Remodeling
Fields Remodeling serves Cupertino, CA and focuses on ADU design-build work, covering attached ADUs, detached units, garage conversions, junior ADUs, and interior conversion projects. They position themselves as a permitting-and-compliance specialist, with their team navigating Cupertino’s zoning ordinances on the client’s behalf.
The company starts each project with a structural review, produces layouts tailored to both the homeowner’s needs and the site’s constraints, and manages code compliance through completion.
name
review
name
6. Wise Builders
Wise Builders is a Cupertino-area contractor with a dedicated ADU service page for the city and a focus on the full design-build cycle. They assign a project manager to every ADU job, keeping that person as the homeowner’s primary contact from permitting through final walkthrough. Their most common project type in Cupertino is garage conversion ADUs, which they cite as the most cost-efficient route for most lots.
The team is listed on Yelp’s top ADU contractors near Cupertino with a 5-star profile and positive reviewer comments.
name
review
name
7. ELS Home Builders
ELS Home Builders (elshomebuilders.com) explicitly lists Cupertino as one of their service cities alongside San Jose, Saratoga, Los Gatos, Mountain View, and others across the South Bay. The company specializes in custom ADU design-build and takes pride in treating ADUs as full living spaces rather than utilitarian add-ons.
Their process runs from initial consultation through architectural design, permits, and construction, with material purchasing done at direct cost, which they pass along to the client. They cover detached backyard ADUs, attached ADUs, and in-law suites for both multigenerational living and rental purposes.
name
review
name
8. Done Right Builders and Remodeling
Done Right Builders and Remodeling is a Cupertino-based general contractor with a specific ADU construction offering that includes garage conversions and full custom ADU builds. They describe deep familiarity with Cupertino’s building codes and permit process, and their team handles everything from architectural plans and structural drawings to city inspections.
Their broader service list also includes kitchen and bathroom remodeling, which means they can fold complementary upgrades into an ADU project if needed. ADU consultation and permitting are included in their service model.
name
review
name
9. DreamHome Remodeling
DreamHome Remodeling serves the Cupertino market with a dedicated ADU program covering design, permitting, and construction. The company references Cupertino’s architectural styles and building codes directly, noting their team’s experience with the city’s specific compliance requirements. They build custom ADUs for in-law suites, rental units, home offices, and guest accommodations.
Their process moves from initial design consultation through permit acquisition and construction, with quality checks built into each phase. Cupertino homeowners can reach them for a consultation directly through their website at dream-home-remodeling.com.
name
review
name
Ready to Start Your ADU Project in Cupertino?
Visit our ADU Construction page to review their work and learn more about what they build. When you’re ready to talk through your project, call us at (408) 545-8413 or reach out through our contact us page. We’re glad to help.
City blurb