Spray Foam Insulation & Concrete Lifting
Residential and commercial spray foam, plus polyurethane concrete lifting, across the South Bay.
D One Builders provides spray foam insulation and concrete lifting throughout Gilroy, Morgan Hill, San Jose, San Martin and Hollister. It is the same crew and the same equipment that has been doing this work in the South Bay for years — now under one roof with the rest of what we build.
Residential Insulation
Spray foam gives a home a continuous barrier against the elements and holds indoor temperatures steady through the year. By sealing the leaks and drafts that batt insulation never touches, it lowers energy bills and improves the air quality inside the house at the same time.
What you get: lower energy costs · better indoor air quality · improved moisture and mould resistance · a house that is simply more comfortable to be in.
Most of the comfort problem in an older home is air movement, not insufficient thickness. That is why sealing changes how a house feels in a way that adding another layer of batt does not.
Commercial Insulation
Commercial buildings have a different problem: operating cost, and keeping conditions tolerable for staff and customers. Whether it is a small office suite or a large industrial building, spray foam delivers thermal performance and noise reduction in one application.
What you get: significant energy savings · improved soundproofing · better building durability · real control over indoor climate.
This pairs naturally with our commercial construction and tenant improvement work — insulating during a build-out is far cheaper than coming back afterwards.
Concrete Lifting
Sunken concrete does not have to mean demolition. Using polyurethane foam injection, we lift and stabilise settled slabs quickly and at a fraction of the cost of tearing out and repouring — driveways, walkways, patios, garage floors and any other surface that has dropped over time.
Why it beats replacement: quick and minimally invasive · far cheaper than a new pour · extends the life of the concrete you already have · the surface is usable again almost immediately.
The honest caveat: lifting fixes settlement. If a slab has structurally failed, or the soil underneath is still moving, we will tell you that up front rather than lift it once and watch it drop again.
Where We Work
Gilroy, Morgan Hill, San Jose, San Martin, Hollister, Los Gatos and San Benito County. Insulation is also part of most of our custom home, addition and ADU projects.
Common questions
What does spray foam insulation cost?
Spray foam is priced by board foot (one square foot at one inch thick). Open-cell typically runs $0.45 to $0.75 per board foot and closed-cell $1.00 to $1.50, so an attic or crawlspace retrofit commonly lands between $2,500 and $8,000 depending on area and depth. Retrofits cost more than new construction because the cavity has to be opened and prepped first.
What is the difference between open-cell and closed-cell foam?
Open-cell is lighter, softer and cheaper, and it is an excellent air seal and sound dampener — good for interior walls and attics. Closed-cell is denser, delivers a higher R-value per inch, resists moisture and adds real structural rigidity, which makes it the right call for crawlspaces, rim joists, exterior applications and anywhere moisture is a concern.
Does spray foam actually lower energy bills?
Yes, mainly because it seals air leaks rather than simply resisting heat transfer. Most of the comfort problem in an older South Bay home is drafts and unsealed penetrations, not insufficient batt thickness. Sealing those is what changes how the house feels and what the HVAC has to do.
What is polyurethane concrete lifting?
It lifts and stabilises sunken concrete by injecting expanding polyurethane foam through small ports drilled in the slab. The foam fills the voids underneath and raises the slab back to level. It is faster and considerably cheaper than tearing out and repouring, and the surface can be used again almost immediately.
What kind of concrete can be lifted?
Driveways, walkways, patios, garage and shop floors, pool decks and steps — anything that has settled rather than structurally failed. If a slab is badly cracked or the underlying soil problem is ongoing, lifting is a bandage and we will say so rather than take the job twice.
Do you serve commercial properties?
Yes. Commercial insulation work is tailored to reducing operating cost and improving conditions for staff and customers, and it delivers meaningful sound reduction as well as thermal performance. We handle everything from small office suites to industrial buildings across the South Bay.
Talk to a Licensed Builder
No pressure and no sales pitch — just a straight answer on what your project takes and what it costs. D One Builders, CSLB #1028049.
Request a Free EstimateOr call 831-318-5896