3 Best Insulation Services in St. Louis (2026)

Ranked by real Google ratings and review volume · How we chose

By Brad Smith, Home Services Expert · ✓ Updated November 2026 · 6 min read

We compared 11 insulation services in St. Louis on Google Maps · 3 listed · How we rank

A second floor that bakes in summer and an attic nobody wants to climb into are the usual reasons people call for insulation. The insulation services in St. Louis on this page hold more than 670 Google reviews between them, all rated 4.9 or higher, and more than 490 of those belong to a single company.

Short answer: Koala Insulation of St. Louis carries a 4.9 rating from more than 490 Google reviews, the most on this page. West County Insulation holds a 5.0 from more than 150 reviews, and Good Attic of Saint Louis a 5.0 from more than 20. No prices are published here.

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Attic insulation specialists compared

#	Business	Rating	Reviews	Best for
1	Koala Insulation of St. Louis	4.9 ★	499	Spray foam and blown-in attics	View ›
2	West County Insulation	5.0 ★	157	Full attic redo with air sealing	View ›
3	Good Attic of Saint Louis	5.0 ★	23	Removal, air sealing and storage platforms	View ›

3 Best Insulation Services in St. Louis (2026)

Insulation companies, one by one

#1 Overall🕑 Open 5 days/wk↩ Responds to reviews

Koala Insulation of St. Louis

4.9499 Google reviews

Koala Insulation of St. Louis is a local location of the Koala Insulation franchise, with an office on S Towne Square in the Affton area. Google lists it as an insulation contractor, and also under waterproofing, building restoration and debris removal. Reviewers describe attic jobs in both closed-cell spray foam and blown-in insulation.

What people praise

One reviewer says they requested a quote, got a visit the next day and had blown-in insulation installed the same week
Crews are described as on time, efficient and careful with the property while they work
A reviewer says the spray foam crew protected everything and shared tips on parts of the project they planned to do themselves
One customer says they had a project other companies called impossible and Koala took it on

Reputation scorecardrank in St. Louis

Rating4.9 / 5

Review volume499 · 95th

Confidencehigh

Recency2 weeks ago

Info completenesssite · phone · hours

Rating breakdown95% 5-star

✓ VerifiedSource: Google

Our take: The largest review base on this page and a company reviewers use for both spray foam and blown-in work. A reasonable first quote if you're not sure which type of insulation your attic needs.

Website Book now +1314-279-5064 Directions

11139 S Towne Square, St. Louis, MO 63123

#2🕑 Open 7 days↩ Responds to reviews

West County Insulation

5.0157 Google reviews

West County Insulation is an insulation contractor with an office on Hanley Industrial Ct in the Brentwood area. Reviewers describe full attic jobs: clearing out old insulation, sealing air leaks, adding baffles, spray foam and blown-in material, and repairing rodent damage. One customer used it for cellulose batts and blown-in insulation in a historic home after water and mold damage.

What people praise

Reviewers describe being given an honest opinion on what they needed, without pressure
Customers mention before-and-after photos and a thoroughly cleaned worksite
One reviewer says the crew sealed leaks, re-insulated the attic and ran new exhaust vents toward the ridge vent
A customer says the team worked them in a week earlier than scheduled

Reputation scorecardrank in St. Louis

Rating5 / 5

Review volume157 · 86th

Confidencemoderate

Recency8 weeks ago

Info completenesssite · phone · hours

Rating breakdown98% 5-star

✓ VerifiedSource: Google

Our take: A strong fit for attics that need more than a top-up, such as leaks, old material or damage to clear out first. Reviewers consistently describe clear quotes and tidy crews.

Website Book now +1314-866-4208 Directions

516 Hanley Industrial Ct #5, St. Louis, MO 63144

#3🕑 Open 7 days

Good Attic of Saint Louis

5.023 Google reviews

Good Attic of Saint Louis is an attic insulation company on S Big Bend Blvd in Richmond Heights. Its website lists attic insulation, insulation removal, attic pest remediation, attic fans and attic air sealing, with a free attic assessment. Reviewers describe removing old attic insulation, installing new material and, in one case, building a storage platform over the top.

What people praise

Reviewers call the estimates honest and say the crew did the work the estimate described
One reviewer says the company handled a difficult insulation removal in an attic of a 1930s house
A customer says the crew built a platform over the new insulation to add storage space
Crews are described as polite and as leaving the garage and worksite clean

Reputation scorecardrank in St. Louis

Rating5 / 5

Review volume23 · 68th

Confidenceearly

Recency3 weeks ago

Info completenesssite · phone · hours

Rating breakdown100% 5-star

✓ VerifiedSource: Google

Our take: A good fit if your attic needs old insulation removed before new material goes in. A perfect rating rests on a smaller review base, so read a few reviews before booking.

Website Book now +1314-931-2620 Directions

1608 S Big Bend Blvd, Richmond Heights, MO 63117

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How the scores work

Rating is each company’s live Google star average. Review volume is how many customers have rated it. Confidence weighs the rating by that volume, so a 4.9 from hundreds of people carries more weight than a 5.0 from a couple of dozen. Recency reflects how recently customers are still leaving reviews.

What drives insulation pricing in St. Louis

No prices are published here. An insulation quote tends to move with the size of the attic, the material (spray foam, blown-in and batts are priced differently), whether old insulation has to be removed first, and extras such as air sealing, baffles or pest cleanup.

Where these insulation companies are based

Koala Insulation of St. Louis has an office in the Affton area, West County Insulation is in the Brentwood area, and Good Attic of Saint Louis is in Richmond Heights. Looking for insulation near me? Each card lists a phone number so you can ask whether they cover your address.

What to ask an insulation contractor before the attic work

Which material do you recommend for my attic (spray foam, blown-in or batts), and why?
Does the quote include removing the old insulation?
Will you seal air leaks and add baffles before the new insulation goes in?
How do you protect the house and the garage while you work?
Will you send photos of the attic before and after?

Frequently asked questions

Which types of attic insulation do St. Louis installers use?

Reviewers describe closed-cell spray foam and blown-in insulation at Koala, spray foam, blown-in material and cellulose batts at West County Insulation, and removal plus new insulation at Good Attic.

Can an insulation company in St. Louis remove old attic insulation first?

Reviewers describe West County Insulation and Good Attic clearing out old attic material before new insulation went in, and Good Attic’s site lists insulation removal as a service.

Do any of these companies handle air sealing or pest damage?

West County Insulation reviewers describe sealing air leaks, foam sealing open gaps and repairing rodent damage. Good Attic’s site lists attic air sealing and attic pest remediation.

How quickly can a St. Louis attic insulation job be scheduled?

One Koala reviewer got a quote visit the next day and the work done the same week, and a West County Insulation customer was worked into the schedule a week early. Timing varies by season, so ask when you call.

Picking an attic insulation company

Koala Insulation of St. Louis has the largest review base on this page, West County Insulation stands out for full attic redo jobs, and Good Attic of Saint Louis for removal work. Get the material, the removal and any air sealing written into the quote before you book.

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