Spray Foam Insulation in St. Louis, MO

Find top-rated spray foam contractors and save up to 35% on energy bills

Compare 4 verified spray foam insulation contractors serving St. Louis, Missouri, backed by 638 customer reviews averaging 4.8★. Whether you're insulating a new build, retrofitting an existing home, or upgrading attic and crawl-space insulation, these pre-screened St. Louis contractors handle both open-cell and closed-cell spray foam. Homeowners here typically cut energy bills by around 35% — get free quotes and read verified reviews below.

💰 Estimated Energy Savings in St. Louis

35%
Average Energy Savings
Typical range: 30% - 40%
$1,596
Estimated Annual Savings
Based on $380/month average energy cost
4 years
Average Payback Period
Return on investment timeline

Note: Actual savings vary based on home size, current insulation, energy rates, and climate conditions. These estimates are based on Department of Energy data for Cold.

Verified Contractors in St. Louis

5⭐
152 Google reviews

Recent Reviews:

W H★★★★★a week ago

My crew did an amazing job today removing old insulation from my attic and replacing it with all new blown-in in insulation. They were very courteous they explained every move they draped off doorway so that no dust would get into my house. They removed all the debris and cleaned up impeccably afterwards. I would recommend them 100%

Josh Haffner★★★★★a week ago

These guys were straightforward with fair pricing. They provide pictures of the work and pictures of any issues they see during the quoting process. They did a good job, kept the house clean, and when the crew came out to perform part of the job they reassessed that part of the job was unnecessary which saved me several hundred dollars. Professional and knowledgeable crew. Would recommend to others.

Julie Rivinus★★★★★2 months ago

I highly recommend West County Insulation. From the moment Sean came to my house for the estimate, I knew they were different. He spent so long in my attic I worried that something had happened to him! However, he was taking photos and measurements and doing a thorough analysis of the work that had to be done! Then we sat down and he went over everything. What an amazing thing that was after initial visits from two previous dud companies. One company just left and then I never heard from them again! West County Insulation cleaned out the old, repaired gables and holes, cleaned the area with disinfectant and THEN blew in new insulation. And when the tech found that my air return was split open, he took care of it without notable added expenses. I think they are a company that is a rare mix of quality and integrity. And yes, in case you are wondering, they are very affordable as well! Please call them!

5⭐
2 Google reviews

Recent Reviews:

Corey Cox★★★★★2 years ago

I would just like to highly recommend Oscar and Aaron for all your installation and weatherazation needs. They arrived on time and never stopped working. They installed installation throughout the whole house. And did so much more. I would highly recommend Aaron and Oscar. My wife and I are very pleased with there work. They were very informative about everything they did. I would like to personally thank Affordable Comfort and team for providing excellent service Thank you so much you all were greatly appreciated. THUMBS UP!!!!!!

Tara DeniCe★★★★★2 years ago

Claude White★3 months ago

This place should get no stars I had this company come in my home to do work one of the workers was in my room for 2 days dealing it up he moved my bed a saw I had money under there and took it now I have to call the police to get this situated there trying to say that they didn’t take it but your was the only one in my room please be careful who you let in your house have anyone else had something like this happen

4.9⭐
460 Google reviews

Recent Reviews:

Tina Wright★★★★★2 weeks ago

I was greatly satisfied with the services rendered by KOALA. Their employees demonstrated good teamwork and time management. They arrived on time and came well prepared. Each employee was very professional (very polite). All of the work was completed to my expectations - including their good housekeeping skills. All debris was removed inside and out. Surprisingly, the price was very affordable. Moreover, the smiles and gentlemen-like behavior was greatly appreciated.

Tim Wolfe★★★★★2 weeks ago

Very knowledgeable all the way from sales to installation. We had a solar fan installed and immediately made a positive impact on how much we ran the air conditioner. I wish I had known about this years ago. Thank you to everyone at Koala.

Tim McGue★★★★★a month ago

Got us filled up to R49 and some insulation rolls. Ryan and team kept me well updated during the process of blowing in the insulation. They took lots of pictures of the attic. I was really happy and would recommend. We had a delay in the initial quote which they said was a new system, but once we got on track everything was great.

4.5⭐
24 Google reviews

Recent Reviews:

S E★★★★★9 months ago

Great company to do business with. We have used them twice on two residential units. One was for blown in insualtion, the other was spray foam. The crew arrived early, told us how long it would take, and got to work. They were efficient and cleaned up with no mess and completed the job quickly . Definitely recommend them for any insulation projects.

D. Williamson★★★★★a year ago

From the sales rep, Steve, the office staff to Tommy and Jared who blew the fiberglass insulation in to bring the attic to R49 the whole experience was positive. Great communication from a professional efficiently run company. Never called anybody else as it was a fair price with a reputable contractor (also recommended by roofer). Very pleased with the installers. They answered my questions, were on time and friendly. Highly recommend based on my experience. Thank You!

Alexa Dickson★★★★★7 years ago

Thrilled with my service with insulation pros! The estimate came in quickly, the price was fair, the work was super professional. The workers did a great job, really quickly, and cleaned up after themselves. Couldn't be more happy or reccomend them highly enough!

Frequently Asked Questions — Spray Foam Insulation in St. Louis

These are the questions St. Louis homeowners ask most about spray foam cost, R-value, and open- vs. closed-cell foam — with context for local pricing and roughly 35% typical energy savings. Compare the 4 verified St. Louis contractors above for exact quotes.

How much can spray foam insulation save on heating and cooling bills in St. Louis?▼
Homeowners in mixed climates like St. Louis, MO typically see 20–30% reductions in total energy costs after spray foam installation. The savings come from both reduced heating in winter and reduced cooling in summer. The exact savings depend on your home's current insulation, size, and local energy rates, but most homeowners recoup the investment within 3–6 years.
Is spray foam better than fiberglass insulation for homes in St. Louis?▼
For most homes in St. Louis, MO, spray foam outperforms fiberglass significantly. Fiberglass batts insulate but do not air seal — meaning conditioned air still escapes through gaps. Spray foam both insulates and creates an airtight seal, addressing the root cause of energy loss. While spray foam costs more upfront, the performance difference in mixed climates makes it the better long-term investment for most homeowners.
Is spray foam insulation worth the cost?▼
For most homeowners, yes. Spray foam creates an air-tight seal that traditional insulation cannot match, reducing energy bills by 15–35% annually. It also adds structural rigidity, acts as a moisture and vapor barrier, reduces outside noise, and can increase home resale value. The higher upfront cost compared to fiberglass is typically recovered within 3–7 years. One important note: because spray foam creates a very tight building envelope, proper mechanical ventilation is important to maintain healthy indoor air quality and prevent interior moisture buildup. This is typically handled by an Energy Recovery Ventilator (ERV) — a system that brings fresh outside air in while pushing stale air out, recovering the energy from the outgoing air so you don't waste what you paid to heat or cool — or a Heat Recovery Ventilator (HRV), which works similarly but is optimized for cold climates. A qualified contractor will assess whether your home needs ventilation upgrades as part of the installation.
How much does spray foam insulation cost in St. Louis, MO?▼
In St. Louis, MO and the surrounding area, spray foam insulation typically costs $1.00–$3.00 per square foot installed, depending on the type and your home's specifics. Open-cell foam runs $0.44–$0.65 per board foot, while closed-cell foam costs $1.00–$2.00 per board foot. A typical 2,000 sq ft home attic in St. Louis costs $2,000–$6,000. Most St. Louis homeowners recoup this investment within 3–7 years through energy savings of 15–35% annually.
What is the difference between open-cell and closed-cell spray foam?▼
Open-cell spray foam is softer, less dense, and less expensive. It expands significantly and is ideal for interior walls, attics, and soundproofing. Closed-cell spray foam is denser, stronger, and provides a moisture barrier — making it better for exterior applications, crawl spaces, and areas prone to flooding or humidity. Closed-cell also has a higher R-value per inch (R-6 to R-7 vs R-3.5 to R-4 for open-cell). One key difference: open-cell foam allows some vapor movement, while closed-cell acts as a vapor barrier — an important consideration for your home's ventilation needs.
How long does spray foam insulation last?▼
Spray foam insulation is one of the most durable insulation options available, with a lifespan of 80+ years when properly installed. Unlike fiberglass batting which can sag and settle over time, spray foam maintains its shape and insulating properties indefinitely. It will typically outlast the building it is installed in.
How do I find a qualified spray foam insulation contractor in St. Louis, MO?▼
When searching for a spray foam contractor in St. Louis, MO, look for ones who are licensed, insured, and have verifiable reviews. Spray foam requires specialized equipment and training — improper installation can cause off-gassing, adhesion failure, or fire hazards. Ask for references, verify their insurance, and get at least 2–3 quotes. A qualified St. Louis contractor will also assess your home's ventilation needs — a tightly sealed spray foam installation requires adequate mechanical ventilation to prevent moisture and indoor air quality issues. FoamMatch pre-screens all listed contractors in St. Louis for licensing and insurance so you can compare verified professionals in your area.
How long does spray foam installation take?▼
Most residential spray foam jobs take 1–2 days depending on the size of the area. A standard attic takes 4–8 hours. After spraying, the foam cures within 24 hours, though most contractors recommend waiting 24–72 hours before occupying the space due to off-gassing during the curing process.
Does spray foam insulation need to be replaced?▼
No — spray foam insulation does not need to be replaced under normal circumstances. Unlike fiberglass insulation which degrades over time, spray foam maintains its R-value and air sealing properties for the life of the building. The only reasons to remove or replace spray foam are water damage, renovation work, or improper original installation.