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Serving Windsor, CA and surrounding areas. (707) 687-4753
Serving Windsor and Sonoma County since 2020. We install spray foam, attic, blown-in, crawl space, and 12 other insulation services - all with permits pulled and inspections passed.
Windsor Insulation is a full-service insulation contractor based in Windsor, CA, offering 16 insulation services to homeowners and businesses across Sonoma County. Whether your home is losing heat through the attic, pulling in cold air from a crawl space, or letting wildfire smoke seep through gaps in the walls - we have a solution. We serve 12 cities and communities in the area, handle permits, and show you the finished work before we leave.
Rooms too hot in summer, too cold in winter? Spray foam seals gaps and insulates in one step for lasting comfort.
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Attic heat radiating into your living space? Proper attic insulation keeps temperatures stable and energy bills lower.
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Old batt insulation settling and leaving gaps? Blown-in material fills every corner without tearing out walls.
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Whole-home comfort starts with the right insulation in every wall, floor, and ceiling - not just the attic.
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Damaged, wet, or pest-contaminated insulation? We remove it cleanly before new material goes in.
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Cold floors in winter and high humidity? Crawl space insulation stops heat loss and moisture problems at the source.
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Drafty walls making certain rooms uncomfortable year-round? Wall insulation fills the gaps that drive up heating bills.
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Insulation alone will not stop air leaks. Air sealing closes the gaps before insulation goes in for real results.
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Uninsulated basement walls and rim joists let cold air pour in. Basement insulation stops heat loss where it starts.
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Need both insulation and a moisture barrier? Closed-cell foam delivers the highest performance in crawl spaces and exterior walls.
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Looking for effective air sealing and sound dampening at a lower cost? Open-cell foam fills attics and interior walls well.
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Commercial buildings with high ceilings and large spaces need insulation solutions built for those demands.
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Moisture rising from bare soil damages floors and framing. A vapor barrier is the first line of defense.
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Condensation and humidity in walls and crawl spaces causes long-term damage. A properly installed vapor barrier stops it.
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Sealing attic bypasses before insulating makes every dollar of insulation work harder and deliver better results.
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Older Windsor homes were built to lower standards. Retrofit insulation brings them up to modern efficiency without major renovation.
Learn MoreThree straightforward steps from your first call to a finished, inspected job.
Reach out by phone or through our contact form. We will ask a few basic questions about your home and what you have noticed - cold floors, high bills, drafty rooms. We schedule a free on-site estimate and respond within 1 business day.
We come to your home, look at the attic, crawl space, or walls in question, and measure what is already there. We check for moisture or pest issues that need to be addressed first. You get a written estimate that explains exactly what we recommend, what it costs, and why.
We handle permits, show up on the scheduled day, and complete the job correctly. Before we leave, we walk you through the finished work and hand you documentation of the installation. If an inspection is required, we coordinate it and let you know when it is passed.
We hold a current California contractor license and carry full liability insurance on every project. That means if something unexpected happens during the job, you are protected - and when it comes time to sell, your insulation work has proper documentation behind it.
We are a local crew, not a franchise or out-of-area company. We have been serving Windsor and Sonoma County since 2020, and we know the homes, the climate, and the building requirements here. We are also the people you can call back if something comes up after the job is done.
Every estimate starts with a visit to your home - no phone quotes based on square footage alone. We look at what is actually there, explain what we find, and give you a written number. You decide whether to move forward, and there is no pressure either way.
When you reach out, someone from our office follows up within 1 business day. For most projects, we can get on the schedule within the same week. We know that comfort problems and high energy bills do not wait, so we do not make you wait either.
Ready to talk through your home? Call us at (707) 687-4753 or send us a message.
"We had spray foam done in the crawl space and attic last spring. The floors stopped feeling cold that same winter - my kids actually noticed before I said anything. The crew showed up on time, cleaned up completely, and walked us through everything at the end."
- Maria T., Santa Rosa - Spray foam insulation
"I was skeptical that blown-in insulation would make that big a difference, but our upstairs rooms are genuinely cooler this summer. The estimate visit was thorough - they measured what was up there and explained exactly why it was not enough for Windsor summers."
- Kevin R., Healdsburg - Blown-in insulation
"Had the attic air-sealed and re-insulated after we noticed smoke smell inside during the fires last fall. The process was smooth, they handled the permit, and the inspector signed off without any issues. Worth every dollar."
- Sandra L., Windsor - Attic air sealing
We respond within 1 business day. There is no obligation and no pressure - just a straightforward conversation about your home. After you submit the form, someone from our office will call to schedule your free on-site estimate.
(707) 687-4753Windsor Insulation is based in Windsor, CA and serves 12 communities across Sonoma County, including Santa Rosa, Healdsburg, Petaluma, and Sebastopol. In most cases, we can schedule your free on-site estimate within the same week you contact us.
If you open your attic hatch and can see the wooden framing beams above the insulation, you do not have enough. Properly insulated attics in California should have material deep enough to bury those beams completely. This is a quick visual check you can do yourself in under a minute.
Smoke enters through gaps around recessed lights, attic hatches, plumbing penetrations, and wall cavities - not just open windows. Air sealing those pathways before or alongside insulation is what actually keeps smoke out. Insulation alone does not stop air movement.
Open-cell foam is better for interior walls, attics, and sound dampening at a lower cost. Closed-cell is denser, provides a moisture barrier, and is the right choice for crawl spaces and exterior walls where water is a concern. The right answer depends on where the insulation is going.
Yes - if the existing insulation is dry, pest-free, and undamaged, blown-in material can go right on top of it. Removal is only necessary when the old material is wet, moldy, or contaminated. Knowing this upfront can save you a significant portion of the project cost.
Moisture rising from bare soil in a crawl space can cause floor joists to rot, mold to grow, and wood subfloors to warp over time. A vapor barrier is the first line of defense, but crawl space insulation paired with proper sealing addresses the root problem. The longer it waits, the more expensive the fix.
PG&E offers rebates for qualifying insulation upgrades, and a federal tax credit of up to 30 percent of project cost is available through 2032. The combination can meaningfully reduce your out-of-pocket expense. Review current rebate offerings at the PG&E website before scheduling work.
Windsor Insulation is a licensed and insured insulation contractor based in Windsor, CA, serving 12 communities across Sonoma County since 2020.
We hold a current California contractor license under the California Contractors State License Board, covering residential and commercial insulation work. Every project we take on is properly permitted and inspected according to California building requirements.
Since 2020, we have completed insulation projects across 16 service categories, from spray foam and attic blown-in to crawl space vapor barriers and commercial retrofit work. We are a local crew, which means we know Sonoma County homes, we know the climate, and we stand behind the work we do here.
Existing insulation can often be supplemented rather than replaced - if it is dry and pest-free. A contractor will measure the current depth and tell you how much more is needed to reach the recommended level for Windsor's climate.
Attics usually deliver the most visible comfort improvement, especially during summer heat. Crawl spaces matter most if you have cold floors or moisture concerns. An assessment helps prioritize based on where your home is losing the most energy.
Ask them to walk you through the finished work and show you depth measurements. California law requires contractors to leave a label in the attic documenting the installed R-value. If they skip that step, that is a red flag worth taking seriously.
For independent guidance on insulation standards and best practices, the U.S. Department of Energy Insulation Guide is a reliable starting point. When you are ready to talk through your specific home, call us at (707) 687-4753 or send us a message.
Windsor is one of Sonoma County's faster-growing towns, with a population that has climbed to roughly 28,000 residents. The town is centered around the Windsor Town Green, a planned public plaza that draws residents together for farmers markets, concerts, and community events throughout the year. It sits off Highway 101 about 8 miles north of Santa Rosa, which makes it close to everything but still feel like a real neighborhood.
Most Windsor homes were built between 1985 and 2010, which means a large share of the housing stock is now 20 to 35 years old. Those homes were built to the energy standards of their time, which are significantly lower than what California requires today. The area experiences hot, dry summers with temperatures regularly reaching the mid-90s and cool, wet winters - a two-season climate that puts real demands on insulation year-round. Sonoma County has also experienced major wildfire events in recent years, including the 2019 Kincade Fire, which prompted many Windsor homeowners to take air sealing and insulation seriously as a way to reduce smoke infiltration.
Whether your home is near Rodney Strong Vineyards off the highway or in a newer subdivision on the east side of town, we know Windsor's homes and we work here regularly. Median home values in Windsor sit around $600,000 to $650,000 according to U.S. Census data, which means your home is a major investment worth protecting with properly installed insulation done by a contractor who knows the local requirements.
By appointment only, no walk-ins.
Windsor Insulation
564 Park Glen Dr
Windsor, CA 95492
Always open, 24/7.
Call Windsor Insulation for a free on-site estimate and we will show you exactly where your home is losing energy and what it will take to fix it.