Insulation Company in San Jose, CA
Woolsey Insulation is an attic and spray foam insulation company serving San Jose homeowners, and we start every job the same way: a written price before any work begins. San Jose’s inland heat, dry summers, and thousands of 1950s-1970s ranch homes mean insulation here is less about brutal winters and more about keeping cool air in and solar heat out. If your attic insulation has settled or your walls were never insulated at all, call (669) 333-3579 and we’ll give you an honest number before we touch anything.
Why San Jose Homes Are Different
San Jose sits inland from the coast, which means our summers run hotter than San Francisco’s or Santa Cruz’s. Homes in neighborhoods like Willow Glen, Cambrian, and the Rose Garden were mostly built in the post-war boom, and many still have their original rock wool insulation, settled to a fraction of its original R-value. Insulation in San Jose is primarily about cooling: cutting the air conditioning load during heat waves and managing solar heat gain through attic spaces. Eichler-style homes and low-slope ranch roofs add their own challenge, because roof pitch limits how much space is available in the attic and often changes how we approach the work. Older stucco-over-wood-frame houses frequently have empty wall cavities, and retrofitting those requires drilling and blowing insulation in from the exterior, with care around older wiring. Mild winters mean heating matters too, but it’s the summer cooling season that drives most of our San Jose calls.
Our Main San Jose Services
Two services make up most of what we do for San Jose homeowners, and each has its own page with local pricing and job details.
Attic Insulation in San Jose
Attic insulation is the most common job we do in San Jose, and it almost always starts with a settled insulation problem. In Willow Glen, Cambrian, and surrounding neighborhoods, homes built in the 1950s and 1960s often have rock wool that has broken down and settled over decades, leaving the attic with far less R-value than it started with. Adding blown-in cellulose, typically GreenFiber, over the settled mass is one of the most cost-effective comfort upgrades you can make in this climate. Full details on pricing, what to expect, and how the job runs are on our Attic Insulation in San Jose page.
Spray Foam Insulation in San Jose
Spray foam insulation, a two-part liquid that expands on contact and seals gaps airtight, is a natural fit for San Jose’s warm climate. It performs well in low-slope and flat-roof homes where traditional insulation doesn’t leave much room to work. We install open-cell and closed-cell foam, often with Demilec or Icynene products, and we’ll tell you honestly which one makes sense for your home rather than pushing whichever product happens to be on the truck. Details and San Jose pricing are on our Spray Foam Insulation in San Jose page.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in San Jose
We work with eight leading insulation brands, including Owens Corning, Johns Manville, Knauf, and Rockwool, so the material recommendation fits your home rather than our inventory. We also carry Demilec spray foams and GreenFiber blown-in cellulose. Parts and materials are stocked locally, so most San Jose jobs don’t wait on shipping. See our brands for the full list.
Pricing for Insulation Company in San Jose, CA
| Service | Typical range in San Jose |
|---|---|
| Attic insulation (basic blow-in, up to 1,200 sq ft) | $1,650 – $2,450 |
| Attic insulation (larger home, 1,200 – 2,500 sq ft) | $2,300 – $3,900 |
| Attic insulation removal | $1,000 – $2,000 |
| Attic air sealing | $750 – $1,400 |
| Spray foam (open-cell, up to 500 sq ft) | $1,400 – $2,200 |
| Spray foam (closed-cell, up to 500 sq ft) | $2,000 – $3,200 |
| Wall insulation (drill-and-fill retrofit) | $1,800 – $3,500 |
| Radiant barrier installation | $1,200 – $2,000 |
Two things push San Jose prices toward the higher end: older homes with unusual framing or tight attics, and jobs that require insulation removal first. Whatever your job involves, you get a written price before any work starts, guaranteed, every time.
Neighborhoods We Serve in San Jose
We work across the entire San Jose area, including these neighborhoods and many others not listed:
- Willow Glen
- Cambrian
- Rose Garden
- Almaden Valley
- Berryessa
We typically schedule San Jose insulation jobs within a few days, and emergency calls are answered by a live person 24/7.
Service Area – Cities Near San Jose
In addition to San Jose, we cover several nearby cities in Santa Clara County. You’ll find our service area includes Santa Clara, CA, Sunnyvale, CA, Campbell, CA, and Cupertino, CA. If you’re not sure whether we cover your address, call and ask, and a real person will answer.
Serving San Jose, CA - Our Local Coverage Area
We’re based in the San Jose area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Insulation Company in San Jose
Most San Jose insulation jobs are scheduled within a few days. We keep the phone answered by a live person 24 hours a day, so when you call, you get a straight answer about availability, not a voicemail maze. Call (669) 333-3579 and we’ll tell you exactly what to expect.
Most attic insulation and air sealing work doesn’t require a permit in San Jose, but wall insulation retrofits sometimes do, and we’ll tell you before any work starts. We’re licensed and insured, and if a permit is needed, we’ll handle the process and make sure the job is done right.
We serve the entire San Jose area, including Willow Glen, Cambrian, Rose Garden, Almaden Valley, Berryessa, and surrounding neighborhoods. If you’re outside the city, check our nearby city pages or just call (669) 333-3579 and we’ll confirm coverage on the spot.
What happens when you call
- 1A real person answersNo phone trees - talk to a local insulation pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3A background-checked tech heads outLicensed & insured, typically within 1-hour.
- 4You approve before work beginsNothing starts until you say go.
What San Jose Customers Say
"The guy didn't try to sell me on foaming the whole house. He said the attic was where I'd actually feel it and left it at that. Honest, and he was right, our bills dropped."
- Angela Ruiz"Upstairs was always ten degrees hotter than downstairs in summer. They added attic insulation and the difference is night and day. Written price up front, no add ons at the end."
- Edith Marlowe"Spray foam in the crawlspace and new attic insulation. They wrote up the whole price and the two jobs came in exactly as quoted. Floors upstairs aren't freezing in the morning anymore."
- Nathan Pruitt