Insulation Company in Hillsborough, CA
Insulation work in Hillsborough looks nothing like insulation work in the flatlands below. The homes are older, larger, and built with plaster-over-lath walls that were never insulated at construction. Add the marine fog that sits on the upper hillsides, and you get a combination that demands more from an insulation contractor than most Bay Area cities. We’re Woolsey Attic Insulation, and we handle the two jobs Hillsborough homeowners call us about most: attic insulation and spray foam insulation. If you’re in Hillsborough and want a written price before anyone touches your walls, call (325) 240-5411.
Why Hillsborough Homes Are Different
Hillsborough’s housing stock is dominated by custom estate homes built between roughly 1910 and 1960, most ranging from 4,000 to over 15,000 square feet. Mediterranean, Spanish Colonial Revival, Tudor Revival, and early ranch styles are the norm. Almost all of them share one trait: plaster-over-lath walls with zero original insulation. There was no insulation requirement when these homes went up, and the builders never added it. That matters because retrofitting these homes is not a drill-and-fill job. Coffered ceilings, original wood paneling, and ornate plasterwork sit behind those walls. Standard blown-in techniques can destroy them. Every Hillsborough insulation project has to be planned around preserving what is already there.
The climate adds another layer. Upper Hillsborough sits squarely in the marine fog layer that rolls in from the Pacific. The result is persistent cool dampness, especially in crawl spaces and along rim joists. Moisture management matters as much as thermal performance here. Closed-cell spray foam in crawl spaces and proper vapor control are not optional upgrades; they are often the difference between a fix that lasts and one that rots out from underneath.
Our Main Hillsborough Services
These are the two services Hillsborough homeowners call Woolsey about most. Each has its own dedicated Hillsborough page with local pricing and the full rundown.
Attic Insulation in Hillsborough
Attic work in Hillsborough usually starts with a problem: uneven room temperatures, high heating bills, or the cold drafts that come off the hillside. In these older estates, the attic is often the single biggest thermal leak in the house. Blown-in fiberglass or cellulose works well here, but the installation has to be done carefully around existing electrical, recessed fixtures, and the original framing that makes these homes worth preserving. We also see a lot of older homes with compressed or settled insulation that once worked but no longer does. See the full breakdown at Attic Insulation in Hillsborough.
Spray Foam Insulation in Hillsborough
Spray foam is the tool of choice for Hillsborough’s crawl spaces and rim joists, where fog-driven condensation has been working on the framing for decades. Closed-cell foam seals gaps airtight and stops moisture from reaching the wood. In upper Hillsborough specifically, we routinely find rotted rim joists and failed sub-floor insulation from years of fog exposure. The fix usually bundles moisture remediation with the insulation work before any material goes in. Learn what that involves at Spray Foam Insulation in Hillsborough.
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 Hillsborough
We work with Owens Corning, Johns Manville, Knauf, and Rockwool, among others. The material we recommend depends on your home, not on what happens to be stocked on the truck. Parts and material for Hillsborough jobs are staged locally, which keeps turnaround tight. See the full list at our brands.
Pricing for Insulation Company in Hillsborough, CA
| Service | Typical range in Hillsborough |
|---|---|
| Attic air sealing and insulation | $1,800 – $4,500 |
| Blown-in attic insulation | $1,500 – $3,800 |
| Attic insulation removal | $1,200 – $2,800 |
| Spray foam attic insulation | $3,500 – $9,000 |
| Crawl space spray foam | $2,800 – $7,500 |
| Rim joist spray foam | $1,400 – $3,200 |
| Spray foam insulation removal | $2,000 – $5,000 |
| Whole-home air sealing | $2,500 – $6,000 |
Hillsborough pricing runs higher than neighboring flatland cities because the homes are larger and the access is harder. Steep lots, finished attics, and preservation-sensitive wall work all add labor. That is why we give a written price before any work starts, with no door-step surprises.
Neighborhoods We Serve in Hillsborough
Hillsborough is small enough that no neighborhood is more than a few minutes from anywhere else in town, but the terrain changes a lot depending on where you are. Upper hillside streets get more fog; lower streets sit drier but still deal with the marine air. We serve the entire town, including:
- Trousdale
- Carolands
- Lakeview
- Burlingame Hills border streets
- Uplands
For most Hillsborough homes, we can schedule a visit within the week and often same-day for emergencies.
Service Area – Cities Near Hillsborough
Hillsborough is our focus, but we also serve homeowners across the wider Bay Area and beyond. If you’re in one of these nearby cities, the same written-price guarantee and 365-day Done Right Promise apply: Los Angeles, CA, San Diego, CA, San Jose, CA, and San Francisco, CA. Dispatch and scheduling are coordinated from the brand’s San Francisco Bay Area office, with crews serving Hillsborough locally.
Serving Hillsborough, CA - Our Local Coverage Area
We’re based in the Hillsborough 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 Hillsborough
Most Hillsborough calls get a visit within the same week, and emergencies can often be scheduled same-day. Our phones are answered by a live person 24 hours a day, 7 days a week, so you always know exactly when someone is coming.
It depends on the scope. Hillsborough’s all-residential character and architectural review process mean certain exterior or structural work faces more scrutiny than in surrounding San Mateo County cities. Insulation-only work inside existing walls or attics typically does not trigger review, but we always check before starting.
Yes. Fog-driven condensation around crawl space rim joists and sub-floor areas is the most common Hillsborough-specific issue we see. We bundle moisture remediation into the insulation quote when we find rot or failed material, so the price you approve is the price that gets the job done properly.
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 30-60 min.
- 4You approve before work beginsNothing starts until you say go.
What Hillsborough Customers Say
"Insulation job was done well. Scheduling took a little longer than I'd have liked, they were booked out a couple weeks. But once they came it was quick and the house is cozier."
- Felicia Grant"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"Drafty old house that never felt comfortable. After the attic and some air sealing it's a different place. On time, clean, and the quote didn't change. Wish I'd done it years ago."
- Dmitri Kozlov