Need more space without moving? We build home additions that fit your lot, your budget, and your family's needs.
Growing families in Almaden Valley and Willow Glen often run out of room fast. A new baby, aging parents moving in, or a work-from-home setup can push a house past its limits. Expansive clay soil in south San Jose and the foothills means additions need solid foundation work, not shortcuts. We've seen homeowners try to add a second story without checking the existing foundation first. That's a costly mistake to fix later[1]. Waiting usually means higher material costs and longer permit delays. San Jose's Building Division has gotten stricter over the years, so getting it right the first time saves months.
Extra bedrooms or a bigger living space built onto your existing home. We match the roofline and siding so it looks original.
Adding a floor above your current home. These need a careful foundation check first, especially on older Willow Glen lots.
Backyard units for rental income or family. San Jose's ADU Ready program can speed up your approval.
A larger bedroom with its own bathroom, built as a wing off your main house. Popular in Almaden Valley remodels.
Light-filled spaces that open up your main living area. We handle the framing, windows, and tie-in roofing.
Turning unused garage space into living area, or expanding it outward for more room.
An addition left half-finished is a nightmare for any household. We coordinate framing, electrical, plumbing, and finish work under one roof so your project doesn't stall. Fast, organized crews mean less time living in a construction zone.
Call us for a free consultation on your home addition. We'll walk your property and give you a straight answer on scope and timeline.
We keep the process straightforward from the first call to final walkthrough.
We visit your property and talk through what you need. We sketch out options that fit your lot and budget.
We handle the San Jose Building Division paperwork for you. This step moves faster when plans are done right the first time.
Our crew builds on schedule with one contact managing every trade. We walk the finished space with you before calling it done.
Addition costs depend on square footage, foundation work, and whether plumbing or electrical needs to be extended. Older homes in Willow Glen and Naglee Park sometimes need extra foundation prep. Clay soil affects the final number. Second story additions cost more than single-level additions because of structural requirements. We give you a written quote before work starts, and we don't add surprise fees once the job is underway.
I rarely leave reviews, but the team at Zubr Construction did such an amazing job that I couldn't not write one.
They replaced all of our old carpet with stunning new laminate floors and painted the interior walls. The transformation is incredible! Their craftsmanship and attention to detail were top-notch, and they left the house spotless.
If you need flooring or painting, stop looking and call these guys. Highly recommended!
We had our full bathroom and powder room renovated, and two months later, I still love the result every single time I walk in.
The main bathroom was a complete gut job, including repairing walls damaged from old leaks. We went through a couple of unexpected hustles, but it was resolved and the timing re-negotiated. The team handled every challenge smoothly, they swapped out the old valve and managed to squeeze a pretty large bathtub through a tight entryway without a scratch.
The tilework around the tub and on the floor looks amazing. Our new vanity turned out to be a bit longer than expected, but they got it fitted into the space perfectly. They also installed new toilets, towel bars, and backlit mirrors in both rooms.
I’d definitely hire them again!
Here are answers to what San Jose homeowners ask us most.
Most additions run between $40,000 and $250,000 depending on size and scope. Second story work costs more due to structural needs. We give you a written estimate after our free consultation.
A single-room addition usually takes two to four months. Second story additions and ADUs can take four to eight months, including permit time. San Jose permit processing slows down in December and January, so timing matters.
Additions involve structural work, electrical, and permits, so hiring a licensed contractor is the safer route. A mistake in foundation or framing can cost far more to fix later. We handle every trade so nothing falls through the cracks.
In most San Jose neighborhoods, adding on costs less than buying a bigger home. You also keep your current location, schools, and neighbors. Many Almaden Valley and Willow Glen families choose this route for that reason.
Yes, any addition over a small size needs a permit from the San Jose Building Division. We handle the submission and inspections for you. Skipping this step can cause problems when you sell your home later.
Cramped bedrooms, a lack of storage, or a growing family are common signs. Working from a kitchen table instead of an office is another one we hear a lot. If you're tripping over each other daily, it's time to talk options.
Not always. Older homes, especially Eichler-style and post-and-beam construction, need a foundation review first. We check your home's structure before recommending a second story. Some lots work better for a ground-level addition instead.
