183 window installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in O'Fallon: Window Nation, CR Score 65/100; 4.8★ from 1,310 Google reviews; open 24/7.
Best for emergencies (open 24/7): Cardinal Contractors, posts 24/7 hours; ranked #10 of 183.
Most-reviewed: Renewal by Andersen, 1,985 Google reviews at 4.7★, the most of 183 ranked; ranked #6.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
183 O'Fallon window installers are ranked here by CR Score, from ten published factors. 15 are open 24/7, 77 open Saturdays and 29 open Sundays, based on posted hours. The median Google rating is 4.8★ across 183 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Window Nation | 65 | 4.8★ (1,310) | Bridgeton, 15 mi away | 24/7 | Overall |
| 2 | Mad City Windows & Baths of St. Louis | 62 | 4.7★ (853) | Bridgeton, 11 mi away | Sat · Sun · Evenings | — |
| 3 | Universal Windows Direct of St Louis | 61 | 4.7★ (554) | St. Louis, 16 mi away | Sat · Sun · Evenings | — |
| 4 | Stratum Structural Systems | 60 | 4.9★ (324) | Chesterfield, 11 mi away | Sat | — |
| 5 | Midtown Home Improvements | 60 | 4.1★ (1,651) | Wentzville, 8 mi away | Sat · Sun · Evenings | — |
| 6 | Renewal by Andersen | 60 | 4.7★ (1,985) | Bridgeton, 13 mi away | — | Most reviews |
| 7 | Window World of St. Louis | 60 | 4.6★ (919) | Saint Peters, 13 mi away | Sat | — |
| 8 | Zen Windows of St. Louis | 59 | 5.0★ (197) | Ballwin, 14 mi away | Sat · Evenings | — |
| 9 | Window Depot USA of St. Louis (XteriorPRO) | 59 | 5.0★ (222) | Saint Peters, 5 mi away | — | — |
| 10 | Cardinal Contractors | 58 | 4.8★ (634) | Saint Peters, 6 mi away | 24/7 | Emergencies |
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 1,310 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Bridgeton, 11 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 8 of 10 factors; credentials and recency not yet collected.
Based in St. Louis, 16 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 8 of 10 factors; credentials and recency not yet collected.
Based in Chesterfield, 11 mi away
Ranked #4 because of its Google rating and trade focus: 4.9★ from 324 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Wentzville, 8 mi away
Ranked #5 because of its Google rating and trade focus: 4.1★ from 1,651 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Bridgeton, 13 mi away
Ranked #6 because of its Google rating and review volume: 4.7★ from 1,985 Google reviews, the most in O'Fallon.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 13 mi away
Ranked #7 because of its Google rating and trade focus: 4.6★ from 919 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ballwin, 14 mi away
Ranked #8 because of its Google rating and trade focus: 5.0★ from 197 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 5 mi away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 222 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 6 mi away
Ranked #10 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 Wentzville, 6 mi away
Ranked #11 because of its Google rating and trade focus: 4.9★ from 184 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Maryland Heights, 17 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 333 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Louis, 23 mi away
Ranked #13 because of its Google rating and trade focus: 4.7★ from 1,253 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Weldon Spring, 7 mi away
Ranked #14 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 O'Fallon
Ranked #15 because of its Google rating and trade focus: 4.6★ from 148 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 2 mi away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 21 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 6 mi away
Ranked #17 because of its Google rating and trade focus: 4.6★ from 208 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Peters, 13 mi away
Ranked #18 because of its Google rating and trade focus: 4.9★ from 177 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Hazelwood, 17 mi away
Ranked #19 because of its Google rating and trade focus: 4.8★ from 76 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ballwin, 23 mi away
Ranked #20 because of its Google rating and trade focus: 4.3★ from 523 Google reviews, listed on Google as “Window installation service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in St. Louis, 27 mi away
Ranked #21 because of its Google rating and trade focus: 4.4★ from 204 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ballwin, 18 mi away
Ranked #22 because of its Google rating and review volume: 5.0★ from 1,075 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saint Charles, 8 mi away
Ranked #23 because of its Google rating and trade focus: 4.7★ from 107 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Murphy, 25 mi away
Ranked #24 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 Saint Charles, 11 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 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 183 ranked window installers here; the rest are on their profiles.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Building Envelope Experts | 55 | 5.0★ (130) | 23 mi |
| 27 | Masonry & Glass Systems Inc | 55 | 4.8★ (91) | 13 mi |
| 28 | All-Type Window and Door llc | 55 | 4.8★ (16) | 9 mi |
| 29 | STL Windows Direct | 55 | 4.8★ (104) | 17 mi |
| 30 | Norm's Bargain Barn | 55 | 4.8★ (72) | 25 mi |
| 31 | Wagner Garage Door | 54 | 4.5★ (15) | 7 mi |
| 32 | Salem Developments | 54 | 4.9★ (65) | 27 mi |
| 33 | Lyons Glass Company | 54 | 4.8★ (90) | 28 mi |
| 34 | Freedom Midwest Windows and Siding, LLC | 54 | 5.0★ (83) | 23 mi |
| 35 | Promax Contracting | 54 | 5.0★ (14) | 11 mi |
| 36 | H & H Glass Works | 54 | 4.7★ (29) | 7 mi |
| 37 | Sears Window Replacement | 54 | 3.6★ (45) | 15 mi |
| 38 | Window-Brite | 54 | 4.8★ (94) | 10 mi |
| 39 | J & J Siding & Window Sales | 54 | 4.6★ (45) | 11 mi |
| 40 | Siding Express | 54 | 4.8★ (36) | 12 mi |
| 41 | A Pane In The Glass | 54 | 4.5★ (34) | 7 mi |
| 42 | Mighty Dog Roofing | 53 | 4.8★ (86) | 6 mi |
| 43 | Arch City Window | 53 | 4.6★ (61) | 16 mi |
| 44 | Next Door & Window | 53 | 5.0★ (12) | 13 mi |
| 45 | Chris window repair | 53 | 5.0★ (20) | 10 mi |
| 46 | Apple Roofing | 53 | 4.4★ (56) | 4 mi |
| 47 | Berry Door & Window | 53 | 3.9★ (49) | 10 mi |
| 48 | Screen Doc | 53 | 5.0★ (19) | 9 mi |
| 49 | Family First Contracting | 53 | 4.1★ (22) | 23 mi |
| 50 | Maris Home Improvements | 53 | 4.8★ (271) | 11 mi |
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 |
|---|---|---|
| Allstar Glass Co. | 4.0★ (2) | 24 mi |
| Cardinal Window Manufacturing | 3.0★ (2) | 15 mi |
| Columbia Meadows by The Kemp Homes Co. | 4.2★ (6) | In O'Fallon |
| Eagle Eye Exteriors | 5.0★ (1) | In O'Fallon |
| Ferguson Roofing | 5.0★ (2) | 6 mi |
| Floyd Renovations | 5.0★ (2) | 6 mi |
| HBP Painting Contractors | 5.0★ (165) | In O'Fallon |
| Jess' Residential Roofing | 4.7★ (36) | In O'Fallon |
| K&D Countertops | 5.0★ (158) | In O'Fallon |
| Mosby Building Arts - Kirkwood Studio | 5.0★ (2) | 22 mi |
| Orf Exteriors | 5.0★ (7) | In O'Fallon |
| Precision Plumbing Solutions | 4.7★ (1,253) | In O'Fallon |
| Replacement Windows & Doors by Tim | 3.5★ (2) | 19 mi |
| Roden's Landscaping | 4.6★ (7) | In O'Fallon |
| Sears Heating and Air Conditioning | 2.0★ (2) | 16 mi |
| Steve Thomas Custom Homes | 5.0★ (1) | In O'Fallon |
| USA Building Systems LLC | 3.0★ (2) | 18 mi |
| Weather Tight Exterior Specialists | 5.0★ (2) | 24 mi |
| Window King Siding & Windows LLC | 5.0★ (2) | 23 mi |
| Window Worx Replacement | 5.0★ (2) | 9 mi |
Typical prices in USD, adjusted for Missouri with a published regional index. Each row names its basis and month.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Window replacement | $3,550 | $7,580 | $12,220 | Per project (several windows): typical range of customer-reported projects. US national range × 1.03 West North Central factor (2025 Cost vs. Value Report) | October 2026 |
We scored 183 O'Fallon window installers 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 O'Fallon 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 |