303 window installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Thorold: Window Repair Guys, CR Score 62/100; 5.0★ from 617 Google reviews.
Best for emergencies (open 24/7): BM Windows and Doors, posts 24/7 hours; ranked #9 of 303.
Most-reviewed: Renewal By Andersen of Western New York, 1,066 Google reviews at 4.8★, the most of 303 ranked; ranked #7.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
303 Thorold window installers are ranked here by CR Score, from ten published factors. 37 are open 24/7, 166 open Saturdays and 92 open Sundays, based on posted hours. The median Google rating is 4.9★ across 303 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Window Repair Guys | 62 | 5.0★ (617) | St. Catharines, 10 km away | — | Overall |
| 2 | MasterShine Window & Eaves Cleaning Niagara | 61 | 5.0★ (243) | Thorold | Sat · Sun | — |
| 3 | Lows Glass, Mirror & Windows | 60 | 4.8★ (155) | St. Catharines, 4 km away | Sat | — |
| 4 | Myles Calvert & Son Windows and Doors | 60 | 5.0★ (105) | Norfolk County, 9 km away | Sat | — |
| 5 | Braymiller Builders of WNY Inc. | 60 | 4.9★ (1,065) | Hamburg, 53 km away | Sat | — |
| 6 | Complete Auto Glass Solutions | 60 | 5.0★ (197) | Niagara Falls, 6 km away | — | — |
| 7 | Renewal By Andersen of Western New York | 60 | 4.8★ (1,066) | Depew, 45 km away | Sat | Most reviews |
| 8 | Complete Auto Glass Solutions | 59 | 5.0★ (280) | Welland, 18 km away | — | — |
| 9 | BM Windows and Doors | 59 | 5.0★ (143) | Etobicoke, 57 km away | 24/7 | Emergencies |
| 10 | BlindsTech Shutters and Blinds | 59 | 5.0★ (37) | Niagara Falls, 7 km away | Sat · Sun | — |
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: 5.0★ from 617 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Thorold
Ranked #2 because of its Google rating and review volume: 5.0★ from 243 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Catharines, 4 km away
Ranked #3 because of its Google rating and trade focus: 4.8★ from 155 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Norfolk County, 9 km away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 105 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Hamburg, 53 km away
Ranked #5 because of its Google rating and review volume: 4.9★ from 1,065 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Niagara Falls, 6 km away
Ranked #6 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 Depew, 45 km away
Ranked #7 because of its Google rating and review volume: 4.8★ from 1,066 Google reviews, the most in Thorold.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Welland, 18 km away
Ranked #8 because of its Google rating and trade focus: 5.0★ from 280 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Etobicoke, 57 km away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 143 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Niagara Falls, 7 km away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 37 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Buffalo, 34 km away
Ranked #11 because of its Google rating and trade focus: 4.9★ from 53 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Catharines, 9 km away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 60 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Catharines, 7 km away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 65 Google reviews, listed on Google as “Gutter Cleaning Service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Buffalo, 45 km away
Ranked #14 because of its Google rating and trade focus: 4.5★ 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 Buffalo, 31 km away
Ranked #15 because of its Google rating and trade focus: 4.7★ from 318 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Catharines, 6 km away
Ranked #16 because of its Google rating and trade focus: 4.9★ from 52 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Buffalo, 52 km away
Ranked #17 because of its Google rating and trade focus: 4.9★ from 95 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Buffalo, 31 km away
Ranked #18 because of its Google rating and trade focus: 4.9★ from 468 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Welland, 14 km away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 64 Google reviews, listed on Google as “Siding contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Tonawanda, 30 km away
Ranked #20 because of its Google rating and trade focus: 4.2★ from 120 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Hamilton, 48 km away
Ranked #21 because of its Google rating and trade focus: 4.5★ from 378 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in St. Catharines, 9 km away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 30 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Niagara Falls, 8 km away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 79 Google reviews, listed on Google as “Window cleaning service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Welland, 18 km away
Ranked #24 because of its Google rating and trade focus: 4.9★ from 40 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. Catharines, 6 km away
Ranked #25 because of its Google rating and trade focus: 4.9★ from 69 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 303 ranked window installers here; the rest are on their profiles.
20 more window installers within 64 km that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| 4wards Exteriors Inc | 5.0★ (2) | 49 km |
| 4wards Exteriors Inc | Siding, Eavestrough & Roofing | Windows & Doors | 5.0★ (2) | 11 km |
| A 1 Siding & Windows Niagara Ltd. | In Thorold | |
| Albright Construction | 5.0★ (2) | 49 km |
| Bingley Windows Siding & Roofing | 3.0★ (2) | 13 km |
| Bucalu Windows & Doors Oakville | 5.0★ (2) | 54 km |
| Cowboy Construction LLC | 5.0★ (2) | 50 km |
| Devine's Complete Home Improvement | 3.0★ (2) | 31 km |
| Finkas Construction Services | 1.0★ (2) | 30 km |
| Four Seasons Sunrooms | 4.5★ (2) | 44 km |
| GMC Aluminum Products | 4.5★ (28) | In Thorold |
| Modern Windows | 3.0★ (2) | 6 km |
| PDQ Quality Home Improvements | 4.5★ (2) | 44 km |
| Pro Desk at RONA | 4.5★ (2) | 12 km |
| Pro Desk at RONA+ | 5.0★ (2) | 8 km |
| Professional Home Detailing | 4.7★ (101) | In Thorold |
| Remodel WNY | 5.0★ (2) | 41 km |
| Sleeth Siding and Windows | 5.0★ (2) | 36 km |
| true carpentry | In Thorold | |
| Valiant Renovators | 5.0★ (2) | 40 km |
US national ranges converted to CAD, not adjusted for Thorold. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Window replacement | CA$4,830 | CA$10,330 | CA$16,640 | Per project (several windows): typical range of customer-reported projects. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | October 2026 |
We scored 303 Thorold 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 Thorold 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 |