How much does insulation cost in Rohnert Park, CA?

For most single-family homes in Rohnert Park, an attic insulation upgrade runs between $1,500 and $4,500, depending on attic size and the type of material used. Spray foam projects typically cost more. Labor costs in Sonoma County run slightly above the national average. Get two or three written quotes from licensed contractors to understand what is fair for your specific home.

What types of insulation are best for Northern California homes?

Blown-in cellulose or fiberglass works well for attics in most Rohnert Park homes. Closed-cell spray foam is the best choice for crawl spaces and anywhere moisture is a concern, because it resists dampness rather than absorbing it. Your contractor should recommend the right material based on the specific area being treated and the condition of what is already there.

How long does an insulation project take in Rohnert Park?

Most attic insulation jobs take one day. Larger projects that include walls, a crawl space, and an attic may take two days. Spray foam jobs require you to stay out of the home for about 24 hours after installation while the foam cures and off-gasses. Your contractor will give you a specific timeline when they assess your home.

Is Custom Rohnert Park Insulation licensed and insured in California?

Yes. Custom Rohnert Park Insulation holds a valid California contractor license issued by the California Contractors State License Board and carries full liability insurance. You can verify any contractor license at no cost on the CSLB website at cslb.ca.gov. Always confirm licensing before hiring any insulation contractor in the state.

Do I need a permit to add insulation to my home?

A standalone attic insulation upgrade often does not require a permit in Rohnert Park. However, if the work is part of a larger renovation or involves changes to the home's structure, a permit may be required under California energy code. A reputable contractor will confirm the permit situation with the city before starting work and will handle the application if one is needed.

Does insulation come with a warranty?

Most insulation materials carry manufacturer warranties, and reputable contractors stand behind their installation work. Blown-in and spray foam insulation, when properly installed and kept dry, can last the life of the home. Ask your contractor for a written warranty covering both the materials and the labor before the job begins.

What is the difference between open-cell and closed-cell spray foam?

Open-cell foam is softer and lighter, making it a good fit for interior walls and attics where sound dampening is a priority. Closed-cell foam is denser and creates a stronger moisture barrier, so it is the preferred choice for crawl spaces, garages, and any area that sees dampness. Closed-cell also has a higher R-value per inch, meaning better insulation in a thinner layer.

My Rohnert Park home was built in the 1960s. Is it a good candidate for insulation upgrades?

Yes - older homes like those built during Rohnert Park's original development are among the best candidates for insulation work. Homes from that era were built before modern energy standards existed, so many have little or no insulation in the walls and minimal coverage in the attic. Spray foam and blown-in insulation can both be applied without major demolition, and the improvement in comfort and energy costs is usually noticeable right away.

Custom Rohnert Park Insulation - insulation contractor in Rohnert Park, CA

Expert Insulation Contractor in Rohnert Park CA - Lower Bills, Lasting Comfort

Custom Rohnert Park Insulation installs spray foam, blown-in, attic, crawl space, and wall insulation for homeowners across Sonoma County. We seal the gaps that make your home uncomfortable and your energy bills high.

(707) 210-9475 Get a Free Estimate

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Insulation Contractor Services in Rohnert Park, CA

Custom Rohnert Park Insulation is a locally owned insulation contractor serving Rohnert Park, CA and surrounding Sonoma County communities. We offer 16 insulation and air-sealing services to help homeowners cut energy costs, improve comfort, and protect their homes from moisture. Whether your house was built in the 1960s or the 2000s, we can assess what it needs and get the job done right.

Spray foam insulation

High energy bills? Spray foam seals gaps and insulates in one step, cutting heat loss for good.

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Attic insulation

Hot upstairs rooms and high PG&E bills often trace back to a thin or missing attic insulation layer.

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Blown-in insulation

Blown-in loose fill fills every corner of your attic quickly, lowering cooling costs by next season.

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Home insulation

Whole-home insulation upgrades tackle the walls, attic, and crawl space - everywhere your heat escapes.

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Insulation removal

Old or wet insulation harms air quality and energy efficiency - safe removal is the right first step.

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Crawl space insulation

Cold floors and moisture under your home are signs the crawl space needs proper insulation now.

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Wall insulation

Drafty rooms and cold walls in winter mean your exterior walls are losing heat every day.

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Air sealing services

Insulation works far better when air leaks around fixtures and pipes are sealed first.

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Basement insulation

An uninsulated basement drags down your whole home's temperature and raises heating bills.

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Closed-cell foam insulation

Closed-cell foam creates a dense, moisture-resistant barrier ideal for crawl spaces and garages.

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Open-cell foam insulation

Open-cell foam is a cost-effective option for interior walls and attics, with great sound dampening.

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Commercial insulation

High heating and cooling costs in your building often come down to missing or aging insulation.

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Crawl space vapor barrier

A vapor barrier stops ground moisture from working its way into your crawl space and home.

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Vapor barrier installation

Proper vapor barriers protect your floors, framing, and air quality from hidden moisture damage.

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Attic air sealing

Sealing attic gaps is the fastest way to reduce heat loss before adding new insulation material.

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Retrofit insulation

Retrofit insulation upgrades bring older homes up to modern comfort without a full renovation.

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How It Works

Call or request a free estimate

Reach out by phone or through our contact form. We respond within 1 business day. Tell us a little about your home and the problem you are dealing with - high bills, drafty rooms, a damp crawl space - and we will schedule a free on-site assessment at a time that works for you.

We assess your home and explain the options

One of our team members visits your home and takes a look at the areas that need attention. We check insulation levels, look for air leaks, and assess any moisture conditions. After the walk-through, we explain what we found and provide a written estimate with clear pricing - no vague quotes, no pressure.

We do the work and you notice the difference

Once you approve the estimate, we schedule the installation and get it done. Most jobs are finished in a single day. We clean up when we leave and walk you through the completed work. Most homeowners notice a difference in comfort and energy use within the first heating or cooling cycle after the job.

Why Homeowners in Rohnert Park Choose Us

Licensed in California, Insured for Every Job

We hold a valid California contractor license issued by the CSLB and carry full liability insurance on every project. You can verify our license at cslb.ca.gov before you hire us.

Free On-Site Estimates, No Obligation

We visit your home, assess the insulation, and give you a written quote - at no cost. You decide whether to move forward. No pressure, no upselling, no bait-and-switch pricing.

Based in Rohnert Park Since 2015

We have been insulating homes in Rohnert Park and Sonoma County since 2015. We know the local housing stock, the climate quirks, and the permit process - so jobs go smoothly from start to finish.

Satisfaction Guaranteed - We Stand Behind Our Work

Every installation comes with a workmanship guarantee. If something is not right after the job is done, we come back and make it right. Our reputation in Sonoma County depends on it.

Ready to get started? Call (707) 210-9475 or request a free estimate online.

What Our Customers Say

They blew in new insulation in my attic last spring, and the upstairs bedrooms were noticeably cooler that summer. My PG&E bill dropped about $40 a month starting in June. The crew was done in half a day and left the hallway cleaner than they found it.

Karen M., Santa Rosa - Attic insulation

I had a musty smell coming from under my house for years. They installed a vapor barrier and sealed the crawl space, and that smell is completely gone. The floors feel warmer too. Wish I had done it sooner.

David R., Petaluma - Crawl space vapor barrier

We got spray foam installed in the walls of our 1970s ranch home. The house holds temperature so much better now. They walked me through everything before and after, and the price matched the written estimate exactly.

Linda T., Cotati - Spray foam insulation

Get a Free Insulation Estimate - Fast and Easy

We respond within 1 business day. There is no obligation to move forward after you submit - just fill out the form and someone from our office will call to schedule a free on-site estimate at your home.

(707) 210-9475

Insulation Contractor Near You in Sonoma County

Custom Rohnert Park Insulation serves Rohnert Park, CA and 11 surrounding cities and communities across Sonoma County and northern Marin County, including Santa Rosa, Petaluma, Cotati, and Novato. We cover all 12 service areas and can usually schedule a free on-site estimate within the same week you call.

Rohnert Park, CA Cotati, CA Santa Rosa, CA Petaluma, CA Sebastopol, CA Windsor, CA Sonoma, CA Novato, CA Healdsburg, CA Kenilworth, CA Cloverdale, CA Napa, CA

Insulation Facts Every Rohnert Park Homeowner Should Know

Why do upstairs rooms get so hot in Rohnert Park summers?

Heat builds up in an under-insulated attic and radiates straight down into your living space. Rohnert Park temperatures regularly climb into the 90s from June through September, making attic insulation one of the most impactful upgrades a homeowner here can make.

Does a 1960s or 1970s home need a full insulation replacement?

Not necessarily a full replacement - but those homes were built to much lower standards than today. Most need attic top-ups and air sealing at a minimum. A free assessment tells you exactly what is there and what it would take to reach current comfort and efficiency levels.

How does coastal moisture affect insulation in Sonoma County homes?

Marine air pushes through the Petaluma Gap corridor and can elevate humidity in crawl spaces and attics. Fiberglass batts absorb that moisture and lose effectiveness. Closed-cell foam and vapor barriers are specifically designed to resist it. The U.S. Department of Energy recommends choosing moisture-resistant materials in damp climates - see energy.gov/energysaver/insulation for details.

Does insulation help keep wildfire smoke out of my home?

Yes - when paired with air sealing. Smoke enters homes through the same gaps that let conditioned air escape. Sealing attic penetrations, electrical fixtures, and wall gaps as part of an insulation job closes those pathways. After Sonoma County wildfire seasons, this has become a practical concern for many local homeowners.

Can I get a PG&E rebate for insulation upgrades in Rohnert Park?

Yes. Rohnert Park is in PG&E territory, and PG&E offers rebates for qualifying insulation upgrades. Federal tax credits under the Inflation Reduction Act also apply to many insulation improvements. Ask your contractor about both programs before you sign anything - the savings can meaningfully reduce your out-of-pocket cost.

What happens if old insulation gets wet or contains hazardous material?

Wet insulation compresses and loses R-value, and it can harbor mold. Insulation installed before the 1980s in some homes may contain materials no longer considered safe. A contractor should flag any concerns during the assessment. If removal is needed, it is handled before new material goes in.

About Custom Rohnert Park Insulation

Custom Rohnert Park Insulation is a licensed and insured insulation contractor based in Rohnert Park, CA, serving Sonoma County and 12 surrounding communities since 2015. We hold a valid contractor license issued by the California Contractors State License Board, which you can verify at cslb.ca.gov. Over the years we have completed insulation projects across all 16 service types we offer - from spray foam and blown-in attic insulation to crawl space vapor barriers and commercial work. We work on homes of every age, including the 1960s and 1970s ranch-style properties that make up a large part of Rohnert Park.

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Frequently Asked Questions

What to Know Before You Hire an Insulation Contractor

Three things to check before the work starts

Confirm the contractor holds a valid California CSLB license - look it up at cslb.ca.gov before signing anything.
Get a written estimate that spells out the material type, R-value target, area to be treated, and total price - no vague quotes.
Ask whether a permit is needed for your project before the work begins - your contractor should know the answer and handle the application if one is required.

When is air sealing as important as insulation itself?

When your home has gaps around light fixtures, pipes, or the attic hatch, heat bypasses the insulation entirely. Sealing those gaps first makes any insulation you add far more effective. The U.S. EPA recommends combining air sealing and insulation for the best energy results.

EPA indoor air quality guidance

What R-value does my attic need in Northern California?

For most Sonoma County homes, the recommended attic R-value falls in the R-38 to R-60 range, which means roughly 10 to 16 inches of depth depending on the material. Homes built before 1980 often fall well short of that. Your contractor should measure what is there and tell you exactly how far below the target your home sits.

How do I know if my crawl space insulation has failed?

Cold floors in winter, a musty smell in the morning, or visible condensation on pipes under the house are reliable signs. In Sonoma County homes, marine air and seasonal rain create real moisture risk in crawl spaces - especially those with original vapor barriers from the 1960s or earlier.

If you are not sure where to start, the best first step is a free on-site assessment. Call (707) 210-9475 and we will schedule a visit within the week.

Serving Rohnert Park and the Sonoma County Community

Rohnert Park is a planned community in Sonoma County, located along Highway 101 between Santa Rosa and Petaluma. The city of about 43,000 residents was developed rapidly starting in the late 1950s, and most of its single-family homes date from the 1960s through the early 1980s. That housing stock is now 40 to 65 years old - right at the age when original insulation starts failing and energy costs start climbing. You can read more about the city at Wikipedia and through the U.S. Census QuickFacts.

The city is home to Sonoma State University and the Green Music Center, one of the best-known performing arts venues in the North Bay. Newer residential neighborhoods like Vast Oak and Willowglen on the southeast side sit alongside the original ranch-style tracts that define most of the city. Both generations of housing face insulation challenges - older homes with inadequate original coverage, newer homes that sometimes need targeted air sealing and crawl space work.

We serve homeowners all across Rohnert Park - from the neighborhoods near Sonoma State to the areas out near Graton Resort. If your home is losing heat in winter, getting too hot in summer, or showing signs of moisture problems under the house, we can help. Call (707) 210-9475 to schedule a free estimate.

Office Location

By appointment only, no walk-ins.

Custom Rohnert Park Insulation

488 Anson Ave

Rohnert Park, CA 94928

(707) 210-9475 team@rohnertparkinsulation.com

Always open, 24/7.

Ready to Lower Your Energy Bills?

Call (707) 210-9475 or request a free on-site insulation estimate online. We serve Rohnert Park and 12 communities across Sonoma County.

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