Spray foam insulation
Tired of rooms that never cool down in summer? Spray foam seals air leaks and insulates at the same time - something no other product does.
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Serving Hollister, CA and surrounding areas. (831) 271-0020
Hollister Insulation helps Hollister homeowners stop wasting money on heating and cooling. We seal air leaks and install insulation that actually works - so your home stays comfortable all year, not just when the weather cooperates.
Hollister Insulation is a full-service insulation contractor serving Hollister, CA and the surrounding region. We handle 16 services - from spray foam and attic insulation to crawl space vapor barriers and commercial projects. Most Hollister homes built before 2000 are under-insulated. That means high energy bills, rooms that never reach the right temperature, and moisture issues you might not even know are there yet. We find the problem and fix it with insulation that lasts.
Tired of rooms that never cool down in summer? Spray foam seals air leaks and insulates at the same time - something no other product does.
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Your attic is the biggest source of heat gain in summer. Proper attic insulation stops that heat before it reaches your living space.
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Blown-in insulation fills every corner and odd-shaped space that batts cannot reach, giving you more complete coverage with less disruption.
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Uncomfortable in summer and cold in winter? A whole-home insulation assessment finds and fixes the gaps driving your energy costs up.
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Old, damaged, or rodent-contaminated insulation works against you. We remove it safely before any new material goes in.
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Cold floors in winter and a musty smell from below are signs your crawl space is uninsulated. We fix that with a sealed, protected space.
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Drafts near outlets and thin exterior walls let outside air straight into your home. Wall insulation puts a stop to that.
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Air leaks are responsible for up to 40% of energy loss in most homes. We find and seal them before any insulation goes in.
Learn MoreReach out by phone or use the contact form on this page. We will ask a few quick questions about your home and what you want insulated. You will hear back within 1 business day - often the same day - to schedule a free on-site estimate at a time that works for you.
We come out to your home, walk through the spaces you want insulated, and measure what is there. We check for any issues - moisture, rodent damage, old insulation that needs to come out first - and give you a clear written quote. No pressure, no obligation.
Once you approve the estimate, we schedule the installation and show up on time with everything we need. After the work is done, we walk you through the finished result and make sure you are satisfied before we pack up. You keep the documentation for rebates or future home sales.
We carry full general liability insurance and hold a valid California contractor license. Every job - large or small - is covered. You can ask for proof of insurance before work begins, no questions asked.
We come to your home, measure the space, and give you a written quote before any work begins. There is no cost for the estimate and no pressure to commit on the spot.
We live and work in the same community as our customers. When you call, you reach our team - not a call center. Local knowledge of Hollister's housing stock and climate shapes how we approach every job.
Most projects can be scheduled within the same week you request an estimate. We respect your time - we show up when we say we will and finish within the timeframe we quoted.
Ready to get started? Request a free estimate or call us directly at (831) 271-0020.
"They came out the same week I called, found that half our attic insulation was compressed and useless, and had everything upgraded in one day. Our upstairs rooms were noticeably cooler by the end of that week - and this was right at the start of August."
Maria T., Hollister - Attic Insulation
"We had a musty smell coming from the crawl space for two summers. They diagnosed the moisture problem, installed spray foam along the walls, and added a vapor barrier. Six months later, the smell is gone and the floors are warmer in winter."
Kevin R., Gilroy - Crawl Space Insulation
"I was skeptical about the cost upfront, but they explained exactly what they were doing and why blown-in was the right call for our 1980s home. Our PG&E bill dropped the following month. I wish we had done this years ago."
Sandra M., Morgan Hill - Blown-In Insulation
We respond within 1 business day. Filling out this form is no-obligation - it just gives us enough information to prepare for your free on-site estimate. After you submit, someone from our office will call you to schedule a time that works for you.
(831) 271-0020Hollister Insulation is based in Hollister, CA and serves 12 cities across the Central Coast and inland valley - including Gilroy, Morgan Hill, Salinas, and Santa Cruz. We schedule most projects within the same week you reach out, and we cover all of San Benito County and its surrounding communities.
The U.S. Department of Energy estimates that proper insulation and air sealing can cut heating and cooling costs by 10 to 20 percent annually.
An under-insulated attic acts like an oven above your ceiling. Hollister summers regularly hit the 90s, and heat builds up in that space all day, then radiates down even after sunset. Adding insulation and air sealing stops that heat at the source.
Air sealing closes the gaps around pipes, wires, and fixtures in your attic floor. Without it, conditioned air escapes through those openings no matter how thick your insulation is. Doing both together delivers far better results than insulation alone.
Open-cell foam is softer and better for interior walls and attics where sound dampening matters. Closed-cell foam is denser, resists moisture, and is the right call for crawl spaces and anywhere water intrusion is a concern.
Open your attic hatch and shine a flashlight in. If you can see the wooden floor joists clearly, your insulation is too thin. Homes built before 2000 in Hollister were often insulated to standards well below what is recommended today.
Yes. Small tremors common in San Benito County can dislodge blown-in insulation, open gaps in crawl spaces, and shift attic framing. If your home is older and has never had a post-earthquake inspection, damage is possible without any obvious signs inside.
Old insulation should be removed when it is contaminated by rodents, soaked by a roof leak, or so compressed it is no longer effective. Installing new insulation on top of a compromised layer wastes money - the old problem stays and your results suffer.
Hollister Insulation is a licensed and insured insulation contractor based in Hollister, CA, serving 12 cities across the Central Coast and San Joaquin Valley region since 2025.
We hold a valid California contractor license, issued by the California Contractors State License Board, which requires passing a trade exam, maintaining active insurance, and meeting state bonding requirements.
We offer 16 distinct insulation and air sealing services - from spray foam and blown-in to vapor barriers and commercial projects - across all 12 cities in our service area.
Want to learn more about who we are and how we work? Read our full About page.
If insulation is contaminated by rodents, soaked by water, or compressed below half its original thickness, it is not worth topping off. Replacing it gives you a clean, effective starting point.
If you have cold floors in winter, a musty smell from below, or a moisture reading above 50% in that space, yes. Crawl space insulation or a vapor barrier protects your floor joists and makes the whole house more comfortable.
PG&E has offered rebates for qualifying insulation upgrades in their service territory, which includes Hollister. Rebate amounts and eligibility change - ask your contractor and check the current PG&E program page before scheduling.
The Spray Polyurethane Foam Alliance (SPFA) publishes installation quality standards and homeowner guides for spray foam work. Ready to take the next step? Call us at (831) 271-0020 or request a free estimate online.
Hollister is the county seat of San Benito County, home to roughly 45,000 residents and situated in a valley surrounded by farmland and hills. Most people here own their homes - about 65 to 70 percent of occupied housing units are owner-occupied according to Census data - and they take upkeep seriously. The city is known nationally as the birthplace of American motorcycling, with the Hollister Independence Rally drawing riders every July.
The housing stock reflects the city's growth through the 1970s to 2000s, with older Craftsman homes near the historic downtown and newer subdivisions on the east and south sides. Many Hollister residents commute to Silicon Valley - about 60 to 80 miles away - and need contractors who can work around their schedules. The area also sits near active fault lines, and seasonal clay soils expand and contract with the rains, which creates ongoing maintenance needs for homes of all ages. Outdoor destinations like Hollister Hills State Vehicular Recreation Area draw residents and visitors year-round.
Hollister Insulation works on homes throughout Hollister - from the older wood-frame houses near downtown to the stucco-exterior homes in the newer eastern neighborhoods. We understand how this valley's hot, dry summers, wet winters, and seismic activity affect insulation performance, and we tailor our approach to what each home actually needs.
By appointment only, no walk-ins.
Hollister Insulation
321 5th St Unit 350
Hollister, CA 95023
Always open, 24/7.
Hollister homes lose thousands of dollars in energy every year through thin insulation and unsealed air leaks. Call us today and we will find where your home is losing energy and fix it.
