Expanding homes for San Jose families.

Wise Builders is a family-owned general contractor crafting seamless room additions and ADUs across San Jose. We handle design, permits, and construction under one roof.

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250+
Projects Completed
4.9
Avg Google Rating
15+
Years Serving San Jose
Licensed
& Insured

More space, one tight crew.

Two-story rear addition blending perfectly with existing San Jose craftsman home
Home Additions
We pour new slabs, match existing rooflines, and integrate seamless HVAC runs so the new square footage feels like it was always there.
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New master bedroom addition framed and sheathed on suburban lot
Room Additions
Need a fourth bedroom or a sun-drenched office? We frame with 2x6 studs, add dual-pane Milgard windows, and tie into existing electrical without a single sub-panel.
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Detached backyard ADU with modern siding and full kitchen visible through sliding door
ADU Construction
From 400-sq-ft studio to 1,200-sq-ft two-bed, we navigate San Jose’s ADU ordinance, pull permits in-house, and deliver move-in-ready units in 90 days.
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Completed kitchen remodel featuring quartz island and matte-black fixtures
Kitchen Remodeling
We relocate gas lines, install soft-close cabinetry, and tile backsplashes down to the 1/16th inch so your new kitchen is both chef-grade and family-proof.
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Converted garage turned bright guest suite with wide plank flooring
Garage Conversions
Transform underused garages into rentable studios or playrooms with proper insulation, egress windows, and dedicated mini-split systems.
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Pop-top second story framed above original single-story ranch home
Pop-Top Second Stories
Add an entire level without expanding the footprint. We engineer new shear walls, install seismic hold-downs, and keep you living downstairs during construction.
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Simple process, no surprises.

01
Free Consultation
We come to you, learn your goals, and answer every question. No pressure, no sales pitch.
02
Detailed Quote
A written scope of work with line-item pricing. You know exactly what you are paying for before we start.
03
We Build It
Our own crew on site, daily updates, and a clean worksite every evening. No subcontractor surprises.
04
Final Walkthrough
We walk every room with you before calling it done. You sign off, we consider it a success.

What San Jose homeowners say.

"Wise Builders turned our cramped three-bed into a five-bed with a flawless master suite. They handled the permits and kept dust out of our living areas the whole time."

Lisa M.
Room Addition

"Our 580-sq-ft backyard ADU rents for $2,800 a month. The team poured the slab, ran sewer, and passed city inspections faster than any contractor we’ve used."

Ravi P.
ADU Construction

"The kitchen reno added an island, double oven, and walk-in pantry without moving a single exterior wall. Feels like a showroom but still ours."

Natalie T.
Kitchen Remodel
Get in Touch

Start your expansion today.

Call (408) 650-2432 or fill out the form for a free design consultation—responses within 24 hours.

San Jose, CA — serving the surrounding area
Mon-Sat, 8am-6pm