279 siding contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Alton: Westside Construction, CR Score 59/100; 4.8★ from 175 Google reviews; open 24/7.
Best for emergencies (open 24/7): Cardinal Contractors, posts 24/7 hours; ranked #4 of 279.
Most-reviewed: Window World of St. Louis, 919 Google reviews at 4.6★, the most of 279 ranked; ranked #35.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
279 Alton siding contractors are ranked here by CR Score, from ten published factors. 49 are open 24/7, 148 open Saturdays and 73 open Sundays, based on posted hours. The median Google rating is 4.8★ across 279 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Westside Construction | 59 | 4.8★ (175) | St. Louis, 18 mi away | 24/7 | Overall |
| 2 | Advocate Construction | 58 | 4.8★ (833) | St. Louis, 18 mi away | — | — |
| 3 | SunSent Roofing | 56 | 4.7★ (57) | Saint Charles, 20 mi away | Sat · Sun · Evenings | — |
| 4 | Cardinal Contractors | 56 | 4.8★ (634) | Saint Peters, 22 mi away | 24/7 | Emergencies |
| 5 | Total Roofing | 55 | 5.0★ (198) | St. Louis, 21 mi away | 24/7 | — |
| 6 | Accredited Roofing | 55 | 4.9★ (298) | Fairview Heights, 23 mi away | 24/7 | — |
| 7 | Bone Dry Roofing | 55 | 4.7★ (575) | Saint Peters, 25 mi away | 24/7 | — |
| 8 | John Beal Roofing | 55 | 4.5★ (466) | Maryland Heights, 19 mi away | 24/7 | — |
| 9 | Storm Guard Roofing & Construction of SW St. Louis | 55 | 4.9★ (393) | Murphy, 31 mi away | 24/7 | — |
| 10 | Exterior Siding Solutions, LLC | 54 | 4.8★ (66) | Ballwin, 28 mi away | Sat | — |
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: 4.8★ from 175 Google reviews, listed on Google as “Siding contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Louis, 18 mi away
Ranked #2 because of its Google rating and trade focus: 4.8★ from 833 Google reviews, listed on Google as “Siding contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Charles, 20 mi away
Ranked #3 because of its Google rating and trade focus: 4.7★ from 57 Google reviews, listed on Google as “Siding contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 22 mi away
Ranked #4 because of its Google rating and review volume: 4.8★ from 634 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Louis, 21 mi away
Ranked #5 because of its Google rating and review volume: 5.0★ from 198 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Fairview Heights, 23 mi away
Ranked #6 because of its Google rating and review volume: 4.9★ from 298 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 25 mi away
Ranked #7 because of its Google rating and review volume: 4.7★ from 575 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Maryland Heights, 19 mi away
Ranked #8 because of its Google rating and review volume: 4.5★ from 466 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Murphy, 31 mi away
Ranked #9 because of its Google rating and review volume: 4.9★ from 393 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ballwin, 28 mi away
Ranked #10 because of its Google rating and trade focus: 4.8★ from 66 Google reviews, listed on Google as “Siding contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Charles, 18 mi away
Ranked #11 because of its Google rating and trade focus: 4.6★ from 140 Google reviews, listed on Google as “Siding contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in East Alton, 7 mi away
Ranked #12 because of its Google rating and trade focus: 3.9★ from 32 Google reviews, listed on Google as “Siding contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Staunton, 10 mi away
Ranked #13 because of its Google rating and review volume: 5.0★ from 54 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Louis, 19 mi away
Ranked #14 because of its Google rating and review volume: 4.7★ from 554 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Weldon Spring, 29 mi away
Ranked #15 because of its Google rating and review volume: 4.8★ from 368 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Louis, 25 mi away
Ranked #16 because of its Google rating and review volume: 4.8★ from 251 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Louis, 27 mi away
Ranked #17 because of its Google rating and trade focus: 4.9★ from 128 Google reviews, listed on Google as “Siding contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Creve Coeur, 20 mi away
Ranked #18 because of its Google rating and trade focus: 4.8★ from 76 Google reviews, listed on Google as “Siding contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Charles, 17 mi away
Ranked #19 because of its Google rating and review volume: 4.7★ from 132 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 27 mi away
Ranked #20 because of its Google rating and review volume: 4.8★ from 222 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Kirkwood, 25 mi away
Ranked #21 because of its Google rating and trade focus: 4.7★ from 43 Google reviews, listed on Google as “Siding contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Barnhart, 25 mi away
Ranked #22 because of its Google rating and trade focus: 4.9★ from 37 Google reviews, listed on Google as “Siding contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 21 mi away
Ranked #23 because of its Google rating and trade focus: 4.6★ from 11 Google reviews, listed on Google as “Siding contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Lake Saint Louis, 25 mi away
Ranked #24 because of its Google rating and trade focus: 4.8★ from 13 Google reviews, listed on Google as “Siding contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in O'Fallon, 29 mi away
Ranked #25 because of its Google rating and review volume: 4.8★ from 215 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 279 ranked siding contractors here; the rest are on their profiles.
20 more siding contractors within 40 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 |
|---|---|---|
| Alton Seamless Gutters & Home improvement | 5.0★ (2) | In Alton |
| Boss Hog Custom Homes, LLC | 1.0★ (2) | 22 mi |
| Buckingham Exteriors, Roofing & Siding, Inc. | 4.5★ (2) | 20 mi |
| Cardinal Window Manufacturing | 3.0★ (2) | 16 mi |
| Colonial Exteriors Inc | 5.0★ (2) | 23 mi |
| Decks & More Construction | 3.0★ (2) | 10 mi |
| Drywall Division | 5.0★ (2) | 23 mi |
| Ferguson Roofing | 5.0★ (2) | 24 mi |
| Galve Development Group | 5.0★ (2) | 23 mi |
| Haislip Siding and Roofing | 5.0★ (2) | 20 mi |
| Hoggatt Construction Co | 3.7★ (3) | In Alton |
| Mosby Building Arts - Kirkwood Studio | 5.0★ (2) | 25 mi |
| Moyer Contracting Company, Home Building, Home Improvements, & Remodeling | 5.0★ (1) | In Alton |
| Nolan's Contracting | 5.0★ (2) | 8 mi |
| RTW Contracting Inc | 3.5★ (2) | 25 mi |
| Sears Heating and Air Conditioning | 2.0★ (2) | 20 mi |
| USA Building Systems LLC | 3.0★ (2) | 20 mi |
| We Show Up Services | 5.0★ (2) | 17 mi |
| Wilson Siding Inc | 3.0★ (2) | 27 mi |
| Window King Siding & Windows LLC | 5.0★ (2) | 19 mi |
Typical prices in USD, adjusted for Illinois with a published regional index. Each row names its basis and month.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Siding replacement | $5,930 | $12,360 | $18,900 | Per house: typical range of customer-reported projects. US national range × 1.07 East North Central factor (2025 Cost vs. Value Report) | October 2026 |
We scored 279 Alton siding 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 Alton 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 |