ADU BUILDER IN SAN JOSE
ADU Builder San Jose
San Jose's leading ADU builder — hundreds of units completed across the city's diverse neighborhoods.
Get a Free QuoteADU Construction in San Jose
As the Bay Area's largest city, San Jose offers tremendous ADU opportunities across its many neighborhoods. 9Builders has built more ADUs in San Jose than any other market, giving us unmatched knowledge of local codes, lot types, and design possibilities.
Citywide Coverage
From Willow Glen to Evergreen, Almaden to Berryessa — we build ADUs in every San Jose neighborhood.
Pre-Approved Plans
Access to San Jose's pre-approved ADU designs for faster permitting and lower design costs.
Diverse ADU Types
Detached units, garage conversions, attached additions, and two-story builds for every lot and budget.
Rapid Permitting
Strong relationships with San Jose's planning department for efficient, hassle-free approvals.
San Jose's Most Trusted ADU Builder
San Jose's ADU-friendly policies and growing housing demand make this the perfect time to build. Our deep knowledge of the city's regulations, neighborhoods, and construction standards means your project will be done right — on time and on budget.
Our ADU Builder Services in San Jose
Full-service ADU construction tailored to your lot, budget, and timeline.
Proven Experience
More ADU projects completed in San Jose than any other Bay Area builder.
Pre-Approved Options
City-vetted plans that skip design review and fast-track your permit.
Competitive Pricing
Volume experience and supplier relationships that keep your costs down.
Why San Jose Homeowners Choose 9Builders
San Jose homeowners choose 9Builders because no other builder knows this city's ADU landscape better.
Hundreds of Projects
A proven track record across San Jose's most popular neighborhoods.
City Relationships
Established rapport with San Jose planning and building departments.
Best Value
Competitive pricing backed by efficient processes and strong material partnerships.
Our ADU Builder Process in San Jose
From your first call to project completion, here's how we deliver exceptional results for San Jose homeowners.
Free Consultation
We visit your San Jose property, discuss your vision, assess feasibility, and provide a preliminary scope of work and cost estimate — all at no charge.
Design & Planning
Our team creates detailed plans tailored to your property, San Jose's building codes, and your budget. We handle all engineering and architectural drawings.
Permits & Approvals
We submit all permit applications, manage plan reviews, and coordinate with San Jose's building department until every approval is secured.
Construction & Completion
Our licensed crew builds to the highest standards, with regular progress updates. We handle all inspections and deliver a final walkthrough before handing you the keys.
Areas We Serve
We serve homeowners across the Bay Area. Click your city to learn more.
ADU Builder Alamo
Upscale properties and spacious lots make Alamo ideal for premium ADU construction and guest house builds.
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ADU Builder Bay Area
Region-wide coverage across 15+ cities with deep knowledge of each municipality's unique ADU regulations.
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ADU Builder Belmont
Hillside expertise and custom engineering for Belmont's sloped lots and scenic residential neighborhoods.
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ADU Builder Campbell
Space-smart ADU designs for Campbell's walkable neighborhoods and charming downtown community.
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ADU Builder Cupertino
Tech-forward ADUs with smart home features, energy efficiency, and modern aesthetics for Cupertino homeowners.
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ADU Builder Fremont
Versatile ADU solutions across Fremont's diverse neighborhoods, from Niles to Mission San Jose.
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ADU Builder Los Altos
Luxury craftsmanship and premium finishes that match Los Altos' distinguished residential character.
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ADU Builder Los Gatos
Elegant ADU designs that honor Los Gatos' historic charm, hillside terrain, and architectural heritage.
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ADU Builder Milpitas
Affordable, high-quality ADUs positioned to capture strong rental demand near tech employers and BART.
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ADU Builder Mountain View
Modern, sustainable ADU construction for Mountain View's innovation-driven community and strong rental market.
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ADU Builder Palo Alto
Design-review-ready ADUs built to Palo Alto's exacting standards with premium materials and green building practices.
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ADU Builder San Jose
The Bay Area's largest ADU market — hundreds of projects completed across San Jose's diverse neighborhoods.
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ADU Builder Santa Clara
Central Silicon Valley location means strong rental demand and excellent returns on your ADU investment.
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ADU Builder Saratoga
Estate-quality ADU construction with landscape preservation and luxury finishes for Saratoga's prestigious properties.
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ADU Builder Sunnyvale
Efficient, modern ADUs designed to attract tech professionals and maximize rental income in Sunnyvale's hot market.
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What Our Customers Say
Our clients are at the heart of everything we do at 9Builders, and their feedback reflects our dedication to quality and service. From beautiful remodels to innovative new builds, hear how we've transformed their spaces and exceeded their expectations.
Tommy, Yuna, and their entire team were amazing from start to finish. We hired them for a big project that included foundation work, a structural retrofit, replacing the PGE main service line, and installing a new 200-amp panel. It was a pretty major job, and honestly, we couldn't have asked for a better crew to handle it. Everyone was professional, polite, and knew exactly what they were doing. They showed up on time, cleaned up every day, and were super respectful of our space.
I hired 9Builders to work on my backyard and they did an amazing job. They built a nice structure that looks really great and added so much to my yard. The team was friendly and kept everything clean while they worked. The work was done quick and looked really good. Now they're working on the front of my house to add an extension, and I'm impressed how fast they worked. They finished the foundation in just two days...
9Builders transformed our kitchen into a beautiful, functional space. They listened to our ideas, offered great suggestions, and delivered high-quality work. The team was professional and respectful throughout.