PRE-APPROVED ADU PLANS IN SAN JOSE
San Jose Pre-Approved ADU Designs
City-vetted plans that let you skip the lengthy review cycle and move straight into construction.
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Fast-Track Your Backyard Build
Adding an Accessory Dwelling Unit (ADU) to your San Jose property can boost your home's value, provide extra rental income, or create a dedicated space for family. But navigating the city's planning and permitting process can be daunting.
That's where San Jose's pre-approved ADU designs come in — standardized, city-vetted plans that let you skip the lengthy review cycle and move straight into construction.
Start Your ProjectWhat Makes a Plan "Pre-Approved"?
A pre-approved ADU design is a set of architectural drawings, engineering details, and site plans already stamped by the City of San Jose for zoning and building compliance.
Meet Zoning Requirements
All dimensions, setbacks, and parking considerations have been checked against San Jose's ADU rules.
Comply with Building Codes
Structural, electrical, plumbing, and energy-efficiency specs are fully documented and approved.
Include Standard Details
Foundation plans, framing schedules, and finish specifications are ready to hand to your builder on day one.
Your ADU, Your Way
San Jose's pre-approved ADU program puts homeowners in the driver's seat. Skip the months of back-and-forth with planners and start building sooner — with city-vetted designs that are ready to go from day one.
Benefits of Choosing Pre-Approved Designs
Pre-approved plans remove the guesswork from your ADU project, saving you time, money, and headaches at every stage.
Faster Permitting
By eliminating the design review step, you can shave weeks off your permit timeline.
Lower Design Costs
No need to pay for a fully custom architectural service — plans are offered at a fixed, budget-friendly rate.
Predictable Construction
With finalized drawings in hand, contractors can provide accurate bids and schedules.
Flexibility
Many pre-approved plans allow minor customizations — such as shifting a window or swapping finishes — without triggering a full review.
Popular Pre-Approved ADU Styles
From compact studio suites to two-story backyard homes, San Jose's pre-approved catalog offers layouts for every lot size and lifestyle.
Studio Suite (400–600 sq ft)
Open living, kitchenette, bathroom — perfect for a rental studio or guest suite.
One-Bedroom Cottage (600–800 sq ft)
Separate bedroom, full kitchen, living area — ideal for long-term tenants or in-laws.
Garage Conversion Kit
Adapt your existing garage into a modern ADU with minimal new construction.
Two-Story Backyard Home (800–1,000 sq ft)
Maximizes usable square footage on smaller lots while maintaining a compact footprint.
How to Get Started
Five simple steps from choosing your plan to breaking ground on your new ADU.
Site Evaluation
Confirm that your lot, setbacks, and utilities fit the chosen plan.
Plan Selection
Browse our gallery or work with a drafting partner to pick the best layout.
Minor Modifications (Optional)
Tweak finishes, window locations, or interior layouts within the plan's allowable scope.
Permit Submission
Submit the pre-approved plans directly to the City of San Jose — no design review required.
Construction
Break ground sooner and enjoy your new ADU faster.
Why Work with a Drafting Expert?
Even with pre-approved plans, you'll want a drafting professional to:
Verify site-specific conditions (easements, slopes, tree setbacks)
Coordinate utility hookups and off-site improvements
Prepare a permit-ready set of documents for your contractor
Guide you through any minor plan adjustments
ADU Construction FAQs: What You Need to Know
Some videos showcasing our recent work.
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.