ADU Contractor in Willow Glen, San Jose
Detached ADUs and garage conversions for Willow Glen's craftsman bungalows and walkable, tree-lined streets.
ADU Contractor San Jose·1600 Component Dr, San Jose, CA 95131
Serving Willow Glen & the streets around Lincoln Avenue.
Licensed & Insured
Full liability & workers' comp coverage
Free Consultation
No-obligation on-site estimates
Design & Permitting
San Jose Municipal Code 20.30.150 compliant
Full-Service Build
Design, permits & construction, start to finish
Our ADU Services in San Jose
Full-service ADU design, permitting, and construction for homeowners across San Jose and Santa Clara County.
Detached ADU Construction
New backyard ADU / granny flat construction, up to approximately 1,200 sq ft, built to San Jose ADU standards
Garage Conversion ADU
Convert an existing garage into a fully permitted living unit — ministerial approval, typical ~60-day review
Attached ADU
An addition attached to your main home, designed to match the existing structure and roofline
Junior ADU (JADU)
Up to 500 sq ft within the existing footprint of your home — an efficient, lower-cost path to added living space
ADU Design & Permitting
Architectural plans, San Jose Municipal Code 20.30.150 compliance, pre-approved ADU plans program, and full permit handling
Granny Flat / In-Law Suite
Multigenerational living units designed for comfort, privacy, and long-term flexibility
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. We handle plan submittal and permit approval.
Construction
Our experienced crew handles the build — foundation, framing, utilities, and finishes — cleanly and on schedule, keeping you updated at every stage.
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
$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.
Willow Glen & Every Area We Cover
ADU Contractor San Jose serves Willow Glen and every city and neighborhood across San Jose & Santa Clara County. 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 — serving Willow Glen
ADU Construction in Willow Glen, San Jose
Willow Glen's tree-lined streets and early-1900s craftsman bungalows make it one of San Jose's most desirable — and most tightly regulated — neighborhoods for new construction. Many lots here are generous by San Jose standards, with detached garages and deep backyards that are well suited to a detached ADU or a garage conversion, but the neighborhood's historic character means design details matter: rooflines, siding, and setbacks that read as an addition to the property rather than a mismatched box.
We've built ADU projects throughout Willow Glen that respect the bungalow aesthetic while meeting San Jose's ministerial ADU approval standards — matching trim, paint, and roof pitch to the main house so the finished unit looks like it belongs. Whether you're converting an existing detached garage or building new in the backyard, we handle design, permitting under Municipal Code 20.30.150, and construction. Text us for a free on-site consultation in Willow Glen.
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
Consultations