What Cupertino Homeowners Say About Topside Attic Insulation Cupertino
Reviews matter because they’re the only thing left after we drive away. We’ve been insulating and sealing homes in Cupertino since 2016, and every one of those 9,000-plus jobs closed with a Documented Photo Record and a written warranty. The feedback we get isn’t about being friendly, though our crews are. It’s about whether the upstairs bedroom finally stays cool in August, whether the PG&E bill actually dropped, whether the blower-door number proved the house was tighter than when we found it. Here’s what homeowners in Cupertino neighborhoods are saying.
Recent Reviews
“We live in a 1962 ranch in Rancho Rinconada with original fiberglass batts that had settled to about two inches. Wes walked the attic with me and pointed out every top plate gap and the recessed can lights that were basically open to the roof. His crew air-sealed everything first, then blew in GreenFiber to R-49. The blower-door test started at 3,800 CFM50 and finished at 1,900. Our August PG&E bill was $187 instead of $312. That’s a real number.”
Heather S., Rancho Rinconada, Cupertino
“I got three estimates for spray foam in our crawl space under the Monta Vista addition. Two contractors wanted to start the next day without a written scope. Wes gave me a flat price on paper, Haven Standard Clause 1, with the warranty spelled out before I signed. The crew encapsulated the space with a vapor barrier, sealed the rim joists with Demilec open-cell, and left me 47 photos of before, during, and after. No surprises.”
Jason S., Monta Vista, Cupertino
“Our 1974 tri-level near Stevens Creek had rodent damage in the attic and compressed insulation over the master bedroom that wasn’t doing anything. I called Topside after finding chewed wires and a nest in one corner. They cleaned the space, rodent-proofed with steel mesh at all penetration points, removed the contaminated batts, and installed new Owens Corning blown-in. The written price was $4,200 and the final invoice was $4,200. They even found a disconnected bathroom vent dumping moist air into the attic that three previous contractors missed.”
Keisha I., Near Stevens Creek, Cupertino
“We bought a Eichler in Fairgrove with the original radiant barrier foil that had torn and oxidized. Wes explained why the existing barrier was actually reflecting heat back into the house in summer, and why a new properly installed barrier with proper air gap would work differently. His team installed a new OSI radiant barrier system, sealed the tongue-and-groove ceiling penetrations, and dropped the attic temperature from 142 degrees to 94 degrees on a 102-degree day in Cupertino. He texted me the thermal camera images.”
Heather B., Fairgrove, Cupertino
“I needed wall insulation for a garage conversion in Oak Valley without tearing down drywall. Wes recommended dense-pack cellulose through drilled access holes, and he showed me a job photo from a similar Cupertino build from 2019 so I could see the finished repair patches. The crew completed it in one day, matched the orange peel texture, and the sound transmission dropped noticeably. My tenant stopped complaining about the freeway noise from 280.”
Jason S., Oak Valley, Cupertino
“After a bad experience with a contractor who blew insulation directly over unsealed can lights, I called Topside for a second opinion. Wes found hot spots with his thermal camera where air was leaking around the fixtures and creating condensation stains on the drywall below. His crew pulled the new insulation back, properly sealed every penetration with fire-rated foam and metal covers, then reinstalled. The 365-Day Done Right Promise wasn’t just words. He came back himself at month four to verify no new stains appeared.”
Heather S., Rancho Rinconada, Cupertino
Why Customers Trust Us
Every review above points to the same thing: documentation beats promises. The Haven Standard requires a written price before any work starts, a written warranty before anyone lifts a tool, and a Documented Photo Record when the crew leaves. On air-sealing jobs, we publish before-and-after blower-door numbers so you can verify the result in a single figure, not take our word for it.
We’re independently owned and operated under The Haven Standard since 2016. Our technicians are background-checked and uniformed. Calls are answered by a live person, 24/7, at (831) 217-8521. No voicemail loops. No callback windows measured in business days.
We source materials from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber. No proprietary lock-in means we specify what’s right for your Cupertino home’s specific condition, not what we’re obligated to sell.
The 365-Day Done Right Promise covers all completed work. If it’s not done right, we make it right. And we bring a Free Second Opinion on any written estimate. Bring us a competing quote and we’ll read it with you, line by line.
Most attic insulation and air-sealing jobs in Cupertino run between $2,800 and $6,400 depending on square footage, existing conditions, and whether we’re addressing a single zone or the full envelope. Crawl space encapsulation typically ranges from $3,200 to $7,800. Spray foam applications vary more widely based on thickness and accessibility. We’ll give you a flat, written price before any work starts. Always.
Call (831) 217-8521 to schedule an evaluation or bring us your existing estimate for a second opinion. Estimates are free. The written price you receive is the price you’ll pay.
Written by Wes Okafor, Owner at Topside Attic Insulation Cupertino, serving Cupertino since 2016.