What Hayward Homeowners Say About Walt’s Insulation
Reviews are how we earn our keep around here. We don’t buy them, we don’t script them, and we sure don’t hide from them. Every review below came from a real homeowner in Hayward or a neighboring community who let us into their attic or crawl space and then took the time to write about what happened. Walt Brenner started this company in 2000 with a simple idea: do the job right, stand behind it forever, and answer the phone when it rings. The reviews keep rolling in because that idea still works. Here’s what people are actually saying.
Recent Reviews
“Our 1963 ranch in the Burbank neighborhood had maybe three inches of old, settled fiberglass up in the attic. The crew from Walt’s blew in Owens Corning loose-fill to R-38, air sealed every penetration they could reach, and the difference was immediate. Upstairs bedrooms stayed comfortable for the first summer we’ve lived here. They found a bathroom exhaust vent that was dumping moist air straight into the attic. Fixed it same day.”
Karen C. – Burbank, Hayward
“I called at 11:30 at night because I thought I heard something in the attic and I was worried it had gotten into the insulation. A real person answered on the second ring. No phone tree, no ‘press 2 for service.’ They had a technician out two days later who confirmed it was a squirrel, removed the contaminated insulation, sanitized the area, and rodent-proofed the entry points. Then they blew in fresh Johns Manville fiberglass. The technician showed me photos of everything before and after.”
Danika H. – Glen Eden, Hayward
“We got three estimates for crawl space encapsulation. Walt’s wasn’t the cheapest and wasn’t the most expensive. What sold me was Walt himself walking the crawl space with me, pointing out exactly where moisture was getting in and explaining the vapor barrier system step by step. No jargon, no scare tactics. The crew installed a 12-mil vapor barrier, sealed the foundation vents, and added a dehumidifier. Our floors stopped feeling cold and the musty smell was gone within a week. The Done Right Promise actually means something to these people.”
Emily S. – Fairview, Hayward
“Our energy bills were creeping up every year and the house never felt warm enough in winter. Walt’s did a home energy audit and found that our walls had almost no insulation left. They drilled and filled with dense-pack Rockwool, which honestly I’d never heard of, but they explained why it works for older homes like ours. The technicians were in uniform, background-checked, and they cleaned up so thoroughly you’d never know they were here. Except for the heating bill that dropped 28% compared to last January.”
Carmen M. – Longwood, Hayward
“The previous owner had done some DIY spray foam work in the attic that was a genuine mess. Walt’s removed all of it, corrected the ventilation issues, and re-insulated with Icynene open-cell foam. They showed me their license number, their address, a real contract with a real warranty. The Done Right Promise is lifetime workmanship. Not five years, not ten. Lifetime. When a company writes that down and puts it in front of you, that means something. I recommended them to my sister in Castro Valley last month.”
Karen C. – Mt. Eden, Hayward
“We needed attic cleaning and rodent proofing after discovering rats had been nesting in the blown-in insulation for who knows how long. Walt’s team removed everything, fogged the space, sealed every entry point with steel mesh and foam, and then blew in new GreenFiber cellulose. They gave me before and after photos I could actually zoom in on. The price was the price, no surprise charges at the end. And the senior discount was applied automatically, which I appreciated more than I can say.”
Danika H. – Hayward Highlands, Hayward
Why Customers Trust Us
Those reviews don’t happen by accident. They happen because we answer our phones with a live person, 24 hours a day, every single day. Not a voicemail system, not a national answering service. A real person who works for Walt’s Insulation and can actually help you. They happen because every technician who steps onto your property is background-checked and wears a uniform so you know exactly who’s in your home. They happen because we install materials from manufacturers we know and trust: Owens Corning, Rockwool, Icynene, Johns Manville, CertainTeed, Demilec, Knauf, and GreenFiber. And they happen because Walt Brenner’s name is on the side of the truck. Not a franchise. Not an 800 number. A real person with a real address and a real license number in Hayward, operating since 2000. Every job is backed by the Done Right Promise: if it’s not done right, we make it right. No fine print, no runaround. If you’re thinking about insulation work, call us at (510) 871-9022 and talk to a person. Tell them Walt sent you.
Written by Walt Brenner, Owner at Walt’s Insulation, serving Hayward and the surrounding communities since 2000.