37 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Alton: West County Insulation, CR Score 86/100; 5.0★ from 129 Google reviews; open 24/7.
Best for emergencies (open 24/7): Air Comfort Service, Inc., posts 24/7 hours; ranked #2 of 37.
Most-reviewed: Moxie Pest Control, 3,165 Google reviews at 4.6★, the most of 37 ranked; ranked #15.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
37 Alton insulation contractors are ranked here by CR Score, from 8 published factors. 8 are open 24/7, 16 open Saturdays and 12 open Sundays, based on posted hours. The median Google rating is 4.8★ across 37 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | West County Insulation | 86 | 5.0★ (129) | St. Louis, 20 mi away | 24/7 | Overall |
| 2 | Air Comfort Service, Inc. | 85 | 4.9★ (2,041) | Hazelwood, 14 mi away | 24/7 | Emergencies |
| 3 | Air Comfort Service Inc. | 83 | 5.0★ (1,159) | Saint Peters, 24 mi away | 24/7 | — |
| 4 | Mid States Spray Foam | 82 | 5.0★ (10) | Godfrey, 3 mi away | Sat · Sun · Evenings | — |
| 5 | Gateway RetroFoam LLC | 82 | 4.9★ (86) | Warrenton, 17 mi away | — | — |
| 6 | Veteran's Pride Wildlife Control | 79 | 5.0★ (3) | Berkeley, 22 mi away | 24/7 | — |
| 7 | Bug Out | 79 | 4.9★ (87) | St. Louis, 18 mi away | 24/7 | — |
| 8 | Bone Dry Roofing | 79 | 4.7★ (575) | Saint Peters, 25 mi away | 24/7 | — |
| 9 | Buckingham Pest Control | 79 | 5.0★ (937) | Saint Peters, 22 mi away | — | — |
| 10 | Better Home Insulation | 78 | 4.9★ (160) | Chesterfield, 24 mi away | Sun · Evenings | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and availability: 5.0★ from 129 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Hazelwood, 14 mi away
Ranked #2 because of its Google rating and availability: 4.9★ from 2,041 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Saint Peters, 24 mi away
Ranked #3 because of its Google rating and availability: 5.0★ from 1,159 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Godfrey, 3 mi away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 10 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Warrenton, 17 mi away
Ranked #5 because of its Google rating and trade focus: 4.9★ from 86 Google reviews, listed on Google as “Insulation contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Berkeley, 22 mi away
Ranked #6 because of its Google rating and availability: 5.0★ from 3 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Louis, 18 mi away
Ranked #7 because of its Google rating and availability: 4.9★ from 87 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Saint Peters, 25 mi away
Ranked #8 because of its Google rating and availability: 4.7★ from 575 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Saint Peters, 22 mi away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 937 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Chesterfield, 24 mi away
Ranked #10 because of its Google rating and trade focus: 4.9★ from 160 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Bridgeton, 16 mi away
Ranked #11 because of its Google rating and trade focus: 4.9★ from 528 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in East Saint Louis, 14 mi away
Ranked #12 because of its Google rating and review volume: 4.9★ from 1,175 Google reviews, 1,175 Google reviews.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in East Alton, 7 mi away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 52 Google reviews, listed on Google as “HVAC contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in East Alton, 6 mi away
Ranked #14 because of its Google rating and trade focus: 4.1★ from 8 Google reviews, listed on Google as “Insulation contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Bridgeton, 16 mi away
Ranked #15 because of its Google rating and review volume: 4.6★ from 3,165 Google reviews, the most Google reviews on this list (3,165).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Collinsville, 18 mi away
Ranked #16 because of its Google rating and trade focus: 4.8★ from 36 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Louis, 18 mi away
Ranked #17 because of its Google rating and availability: 4.9★ from 72 Google reviews, open 7 days a week.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Maryville, 17 mi away
Ranked #18 because of its Google rating and availability: 4.6★ from 38 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Louis, 24 mi away
Ranked #19 because of its Google rating and availability: 4.7★ from 34 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Louis, 20 mi away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Saint Peters, 22 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 8 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Troy, 19 mi away
Ranked #22 because of its Google rating and trade focus: 4.8★ from 24 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Saint Charles, 18 mi away
Ranked #23 because of its Google rating and trade focus: 4.7★ from 14 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Maryland Heights, 18 mi away
Ranked #24 because of its Google rating and trade focus: 4.3★ from 21 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Maryland Heights, 19 mi away
Ranked #25 because of its Google rating and trade focus: 4.2★ from 10 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
#1 to #25 are shown in full above. Here are #26 to #37, in CR Score order; each links to its profile.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Thermal Concepts Home Products | 70 | 3.9★ (20) | 18 mi |
| 27 | Henges Insulation | 69 | 4.2★ (9) | 18 mi |
| 28 | John Bender Inc. | 69 | 4.7★ (3) | 16 mi |
| 29 | Bi-State Insulation, Inc. | 68 | 5.0★ (3) | 22 mi |
| 30 | ShowMe Roofing & Exteriors | 68 | 4.8★ (19) | 20 mi |
| 31 | Bay Insulation of Missouri | 68 | 3.9★ (13) | 22 mi |
| 32 | Gateway Home Services | 66 | 4.8★ (131) | 25 mi |
| 33 | St. Louis Ceiling Installers LLC | 64 | 4.9★ (16) | 20 mi |
| 34 | St Charles Painting & Remodeling | 64 | 4.9★ (16) | 23 mi |
| 35 | All Star & Roofing | 62 | 4.3★ (6) | 20 mi |
| 36 | BROCK INDUSTRIAL | 62 | 3.9★ (10) | 20 mi |
| 37 | Clayton Restoration Company | 60 | 2.3★ (3) | 23 mi |
20 more insulation contractors within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| AbsoSeal Injection | 4.5★ (2) | 21 mi |
| Acme Fire Proofing & Installation | 5.0★ (1) | 18 mi |
| ATW Contracting | 4.9★ (11) | In Alton |
| Bay Insulation of Missouri Inc | 5.0★ (1) | 19 mi |
| Crown Insulation LLC | 18 mi | |
| D&L Painting and Drywall | 2.0★ (1) | 16 mi |
| Dardenne Insulation Solutions | 1.0★ (1) | 14 mi |
| Diversified Painting & Contracting, LLC | 16 mi | |
| Gene's Appliance AC & Heating | 4.9★ (207) | In Alton |
| Gonz Insulation | 5.0★ (2) | 22 mi |
| Greenmark Home Performance, LLC | 1.0★ (1) | 23 mi |
| Industrial Construction And Engineering | 1.0★ (1) | 24 mi |
| Insulation Masters, Inc. | 17 mi | |
| KB Insulation and Drywall, LLC | 17 mi | |
| M.I.S Insulation | 17 mi | |
| Manchesters Insulation Solutions | 9 mi | |
| Paragon Pipecoverers, Inc. Mechanical Insulation Contractor | 5.0★ (1) | 18 mi |
| Sidney Insulation Inc | 5.0★ (1) | 19 mi |
| St. Louis Insulation Pros | 18 mi | |
| Sundermeyer Ltd. | 5.0★ (2) | 16 mi |
National price ranges in USD, not adjusted for Alton. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Attic insulation | $1,700 | $2,100 | $2,500 | Per attic: typical range of customer-reported jobs (about $1 to $3 per sq ft). US national range | October 2026 |
We scored 37 Alton insulation contractors on 8 factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. Unknown factors are left out of the score, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Alton data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |