ADU Contractor San Jose
Detached ADUs, garage conversions, attached ADUs, JADUs, design & permitting, and granny flats — built on years of working these San Jose neighborhoods and the planning desks that review them.
ADU Contractor San Jose·1600 Component Dr, San Jose, CA 95131
Licensed & Insured
Full liability & workers' comp coverage
Free Consultation
No-obligation on-site estimates
Design & Permitting
San Jose Municipal Code 20.30.150 compliant, filed by a team the planning desk knows
Full-Service Build
Design, permits & construction, start to finish
Our ADU Services in San Jose
Full-service ADU design, permitting, and construction, built on years of working the same San Jose neighborhoods and the planning and inspection offices that review them.
Detached ADU Construction
New backyard ADU / granny flat construction, up to approximately 1,200 sq ft, designed to clear San Jose plan check the way local reviewers expect to see it
Garage Conversion ADU
Convert an existing garage into a fully permitted living unit — ministerial approval, typical ~60-day review, tracked personally with the same San Jose inspectors we work with every week
Attached ADU
An addition attached to your main home, designed to match the existing structure and roofline, and scoped against the setback rules of your specific San Jose neighborhood
Junior ADU (JADU)
Up to 500 sq ft within the existing footprint of your home — an efficient, lower-cost path to added living space, filed the way San Jose plan check prefers to see JADU submittals
ADU Design & Permitting
Architectural plans and San Jose Municipal Code 20.30.150 compliance, handled by a team that has walked this exact permit desk for years and knows what gets a plan set approved on the first pass
Granny Flat / In-Law Suite
Multigenerational living units designed for comfort, privacy, and long-term flexibility, shaped by what we have seen work in San Jose neighborhoods for years
Not sure which ADU type fits your lot? Text us for a free consultation.
How It Works
From first idea to a finished, permitted ADU — our simple four-step process.
Reach Out
Text us for a free, no-obligation consultation. Tell us about your property, your goals, and your budget.
Design & Permitting
We visit your property, assess the lot, and design an ADU plan that fits your site and San Jose Municipal Code 20.30.150 — then submit it through the same planning desk relationships we've built over years of local projects.
Construction
Our experienced crew handles the build — foundation, framing, utilities, and finishes — and schedules inspections directly with the San Jose inspectors who cover your neighborhood.
Move In
Final inspection, walkthrough, and handoff — your new ADU, JADU, or in-law suite is ready for family or tenants.
ADU Investment Guide
Every project is different — these are typical San Jose ranges to help you plan. Your exact price comes with a free, itemized estimate.
Junior ADU (JADU)
Within your home's existing footprint
From $60,000
- Free on-site consultation
- Up to 500 sq ft, built within your home
- Design & San Jose permit handling
- Efficient kitchenette & living area layout
- Typically the fastest ADU path
Garage Conversion ADU
Most popular — fast ministerial approval through the desk we know well
$80,000 – $150,000
- Custom design plan for your garage
- San Jose Municipal Code 20.30.150 compliance
- Ministerial approval, ~60-day review
- Full utility & finish upgrade
- Project management start to finish
Detached / Attached ADU
New backyard unit or home addition
$150,000 – $400,000
- Custom architectural design
- Up to ~1,200 sq ft detached ADUs
- Attached additions matched to your home
- Full permitting & construction management
- Granny flat / in-law suite layouts available
Prices vary with size, site conditions, utility connections, and finish level. Design and permitting fees are typically $1,000–$5,000 on top of construction. Contact us for an exact quote — consultations are always free.
Recent ADU Projects in San Jose
A look at real ADU project types from our San Jose team.
Service Areas We Cover
We've built ADUs across these San Jose neighborhoods for years and know the specific planning contacts each one runs through. Explore the interactive map or pick your area below.
Areas We Serve
Serving San Jose and Santa Clara County. Don't see your area listed? Text us — we most likely cover it.
Where to Find Us
ADU Contractor San Jose · 1600 Component Dr, San Jose, CA 95131
Deep Roots in San Jose Neighborhoods
ADU Contractor San Jose has spent years building ADUs in the same San Jose neighborhoods — craftsman bungalows in Willow Glen, hillside lots in Almaden Valley, established streets in Rose Garden and Cambrian Park — which means we already know how each area's lot patterns and setback quirks affect a design before we draw the first line.
That local history matters most at the permit counter. Detached backyard ADUs, garage conversions, attached additions, Junior ADUs (JADUs), and granny flats or in-law suites all move through San Jose Municipal Code 20.30.150 review, and having worked with the same planning and inspection staff on past neighborhood projects tends to smooth out the process rather than starting from zero each time.
As a licensed and insured California general contractor, we put that local relationship to work for you — realistic timelines, permit-savvy design, and a team that already knows the office reviewing your file. Every project starts with a free on-site consultation. Text us to get started.
Frequently Asked Questions
Everything you need to know about building an ADU in San Jose.
Costs vary widely with size and scope. A garage conversion ADU typically runs $80,000–$150,000, an attached ADU addition $150,000–$300,000, and a new detached ADU $250,000–$400,000. Design and permitting fees are typically $1,000–$5,000 on top of construction. We give you a clear, itemized estimate after a free on-site consultation — text us to get started.
Get Your Free Consultation
Ready to add an ADU, garage conversion, or in-law suite? Text us for a free, no-obligation consultation and estimate anywhere in San Jose & Santa Clara County.
Licensed
& Insured
Free
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