7 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Warrenton: Gateway RetroFoam LLC, CR Score 64/100; 4.9★ from 86 Google reviews.
Best for emergencies (open 24/7): iFOAM Insulation of O'Fallon, posts 24/7 hours; ranked #2 of 7.
Most-reviewed: Addict Insulation, LLC, 159 Google reviews at 4.6★, the most of 7 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
7 Warrenton insulation contractors are ranked here by CR Score, from ten published factors. 2 are open 24/7, 3 open Saturdays and 3 open Sundays, based on posted hours. The median Google rating is 4.8★ across 7 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Gateway RetroFoam LLC | 64 | 4.9★ (86) | Warrenton | — | Overall |
| 2 | iFOAM Insulation of O'Fallon | 62 | 5.0★ (113) | O'Fallon, 23 mi away | 24/7 | Emergencies |
| 3 | Addict Insulation, LLC | 59 | 4.6★ (159) | Saint Peters, 25 mi away | Sat · Sun · Evenings | Most reviews |
| 4 | Insulation Pros | 57 | 4.5★ (24) | Warrenton | — | — |
| 5 | Capital Foam Systems | 55 | 4.8★ (69) | O'Fallon, 24 mi away | — | — |
| 6 | West County Insulation | 53 | 5.0★ (5) | O'Fallon, 24 mi away | 24/7 | — |
| 7 | Thermaltech, Inc. | 48 | 2.3★ (3) | Washington, 19 mi away | — | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and trade focus: 4.9★ from 86 Google reviews, listed on Google as “Insulation contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in O'Fallon, 23 mi away
Ranked #2 because of its Google rating and trade focus: 5.0★ from 113 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 25 mi away
Ranked #3 because of its Google rating and review volume: 4.6★ from 159 Google reviews, the most in Warrenton.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Warrenton
Ranked #4 because of its Google rating and trade focus: 4.5★ from 24 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in O'Fallon, 24 mi away
Ranked #5 because of its Google rating and trade focus: 4.8★ from 69 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in O'Fallon, 24 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Washington, 19 mi away
Ranked #7 because of its Google rating and trade focus: 2.3★ from 3 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
National price ranges in USD, not adjusted for Warrenton. 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 7 Warrenton insulation contractors on ten 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. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, 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 Warrenton data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |