San Jose Experts for Extra Space.

One-Up Builders & Remodeling is a family-owned general contractor in San Jose. We specialize in home additions, ADUs, and kitchen remodels that add real square footage and value.

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300+
Projects Completed
5
Avg Google Rating
15+
Years Serving San Jose
Licensed
& Insured
What We Do

Every trade, one trusted crew.

Two-story rear addition under construction in Willow Glen neighborhood
Home Additions
We pour new stem-wall foundations, match existing stucco and rooflines, and tie into San Jose sewer and gas mains. Engineered beams and seismic anchors keep every addition code-solid.
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Master suite addition framed with shear panels and dual-pane sliders
Room Additions
Need a home office or nursery? We frame insulated walls, install Milgard Quiet Line windows, and extend HVAC runs so the new room feels original.
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Detached 1-bedroom ADU with vertical cedar siding and solar roof
ADU Construction
From 400-sq-ft studios to 1,200-sq-ft two-bed units, we navigate San Jose's fast-track ADU permits, pre-wire for EV chargers, and build rent-ready in under 6 months.
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Modern white kitchen with waterfall quartz island and pendant lighting
Kitchen Remodeling
We strip to studs, relocate gas lines for island cooktops, install soft-close cabinets, and lay porcelain slabs that handle San Jose heat without cracking.
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Permit set rolled out on construction table marked City of San Jose
Permit Handling
Our in-house permit tech submits plans, schedules city inspections,, and keeps your project moving while you focus on tile choices.
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Designer showing 3D home addition render to homeowners on tablet
Design Consultation
Bring us your napkin sketch; we turn it into a 3D model and material list during a free two-hour visit.
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How We Work

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.
Reviews

What San Jose homeowners say.

"One-Up added a 600-square-foot master suite over our garage. They matched our 1978 roof tile perfectly and finished two weeks early."

Lisa T.
Master Suite Addition

"The new ADU rents for $2,800 a month. Permits were approved in 31 days because One-Up knew exactly what San Jose wanted."

Ravi P.
ADU Construction

"Our kitchen went from cramped galley to open chef's space with a 10-foot island. No change orders, just honest daily updates."

Maria G.
Kitchen Remodel
Get in Touch

Ready for more space?

Call (408) 634-3891 for a free in-home estimate. We respond within 24 hours.

(408) 634-3891
San Jose, CA — serving the surrounding area
Mon-Sat, 8am-6pm