190 window installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Alton: Window Nation, CR Score 92/100; 4.8★ from 1,310 Google reviews; open 24/7.
Best for emergencies (open 24/7): Cardinal Contractors, posts 24/7 hours; ranked #4 of 190.
Most-reviewed: Renewal by Andersen, 1,985 Google reviews at 4.7★, the most of 190 ranked; ranked #12.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
190 Alton window installers are ranked here by CR Score, from 8 published factors. 15 are open 24/7, 81 open Saturdays and 29 open Sundays, based on posted hours. The median Google rating is 4.7★ across 190 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Window Nation | 92 | 4.8★ (1,310) | Bridgeton, 16 mi away | 24/7 | Overall |
| 2 | Mad City Windows & Baths of St. Louis | 87 | 4.7★ (853) | Bridgeton, 18 mi away | Sat · Sun · Evenings | — |
| 3 | Universal Windows Direct of St Louis | 86 | 4.7★ (554) | St. Louis, 19 mi away | Sat · Sun · Evenings | — |
| 4 | Cardinal Contractors | 83 | 4.8★ (634) | Saint Peters, 22 mi away | 24/7 | Emergencies |
| 5 | Star Auto Glass, Inc. | 83 | 4.4★ (204) | St. Louis, 13 mi away | Sat · Sun | — |
| 6 | Lyons Glass Company | 82 | 4.8★ (90) | Alton | Sat | — |
| 7 | Accredited Roofing | 82 | 4.9★ (298) | Fairview Heights, 23 mi away | 24/7 | — |
| 8 | Window World of St. Louis | 82 | 4.6★ (919) | Saint Peters, 18 mi away | Sat | — |
| 9 | Storm Guard Roofing & Construction of SW St. Louis | 82 | 4.9★ (393) | Murphy, 31 mi away | 24/7 | — |
| 10 | Stratum Structural Systems | 82 | 4.9★ (324) | Chesterfield, 28 mi away | Sat | — |
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: 4.8★ from 1,310 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Bridgeton, 18 mi away
Ranked #2 because of its Google rating and trade focus: 4.7★ from 853 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Louis, 19 mi away
Ranked #3 because of its Google rating and trade focus: 4.7★ from 554 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Saint Peters, 22 mi away
Ranked #4 because of its Google rating and availability: 4.8★ from 634 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Louis, 13 mi away
Ranked #5 because of its Google rating and trade focus: 4.4★ from 204 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Alton
Ranked #6 because of its Google rating and trade focus: 4.8★ from 90 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Fairview Heights, 23 mi away
Ranked #7 because of its Google rating and availability: 4.9★ from 298 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Saint Peters, 18 mi away
Ranked #8 because of its Google rating and trade focus: 4.6★ from 919 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Murphy, 31 mi away
Ranked #9 because of its Google rating and availability: 4.9★ from 393 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Chesterfield, 28 mi away
Ranked #10 because of its Google rating and trade focus: 4.9★ from 324 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Ballwin, 29 mi away
Ranked #11 because of its Google rating and trade focus: 5.0★ from 197 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Bridgeton, 17 mi away
Ranked #12 because of its Google rating and review volume: 4.7★ from 1,985 Google reviews, the most Google reviews on this list (1,985).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Weldon Spring, 29 mi away
Ranked #13 because of its Google rating and availability: 4.8★ from 368 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Affton, 17 mi away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 21 Google reviews, listed on Google as “Window installation service”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Hazelwood, 14 mi away
Ranked #15 because of its Google rating and trade focus: 4.8★ from 76 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Ballwin, 27 mi away
Ranked #16 because of its Google rating and trade focus: 4.3★ from 523 Google reviews, listed on Google as “Window installation service”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Maryland Heights, 18 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 333 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in East Saint Louis, 17 mi away
Ranked #18 because of its Google rating and trade focus: 4.9★ from 65 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Wentzville, 36 mi away
Ranked #19 because of its Google rating and trade focus: 4.1★ from 1,651 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Louis, 22 mi away
Ranked #20 because of its Google rating and trade focus: 4.7★ from 1,253 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Saint Peters, 10 mi away
Ranked #21 because of its Google rating and trade focus: 4.1★ from 22 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Saint Peters, 26 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 222 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Saint Peters, 17 mi away
Ranked #23 because of its Google rating and trade focus: 4.9★ from 177 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Murphy, 30 mi away
Ranked #24 because of its Google rating and trade focus: 4.8★ from 72 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Saint Charles, 17 mi away
Ranked #25 because of its Google rating and trade focus: 4.5★ from 38 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 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 190 ranked window installers here; the rest are on their profiles.
20 more window installers 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 |
|---|---|---|
| A Josh of ALL Trades | 4.6★ (23) | In Alton |
| Allstar Glass Co. | 4.0★ (2) | 30 mi |
| Alton Garage Door Repair | 5.0★ (22) | In Alton |
| Cardinal Plumbing Co. | 4.9★ (462) | In Alton |
| Cardinal Window Manufacturing | 3.0★ (2) | 16 mi |
| Color Concepts Painting Inc. | 5.0★ (58) | In Alton |
| Edwardsville Window Cleaning & Power Washing | 5.0★ (1) | 13 mi |
| Ferguson Roofing | 5.0★ (2) | 24 mi |
| Floyd Renovations | 5.0★ (2) | 26 mi |
| Massa Exteriors | 5.0★ (2) | 40 mi |
| Mosby Building Arts - Kirkwood Studio | 5.0★ (2) | 25 mi |
| Moyer Contracting Company, Home Building, Home Improvements, & Remodeling | 5.0★ (1) | In Alton |
| Replacement Windows & Doors by Tim | 3.5★ (2) | 14 mi |
| Sears Heating and Air Conditioning | 2.0★ (2) | 20 mi |
| Tom Abert Windows & Siding | 5.0★ (1) | 10 mi |
| Tycon Builders LLC | 4.2★ (18) | In Alton |
| Unitherm Window Sales | 3.0★ (2) | 17 mi |
| USA Building Systems LLC | 3.0★ (2) | 20 mi |
| Window King Siding & Windows LLC | 5.0★ (2) | 19 mi |
| Window Worx Replacement | 5.0★ (2) | 22 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 |
|---|---|---|---|---|---|
| Window replacement | $3,430 | $7,340 | $11,830 | Per project (several windows): typical range of customer-reported projects. US national range × 1.00 East North Central factor (2025 Cost vs. Value Report) | October 2026 |
We scored 190 Alton window installers 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 |