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Best Window Installers in St. Thomas, ON (2026)

70 window installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in St. Thomas: Brookstone Windows & Doors, CR Score 89/100; 4.7★ from 442 Google reviews; open 7 days a week.

  2. 2

    Best for emergencies (open 24/7): Accurate Window Cleaners, posts 24/7 hours; ranked #2 of 70.

  3. 7

    Most-reviewed: Heritage Renovations, 298 Google reviews at 4.4★, the most of 70 ranked after Brookstone Windows & Doors; ranked #7.

Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank

70 St. Thomas window installers are ranked here by CR Score, from 8 published factors. 8 are open 24/7, 29 open Saturdays and 12 open Sundays, based on posted hours. The median Google rating is 4.8★ across 70 rated businesses.

Most of this list also appears on the Window installers in London ranking. See Window installers in London

Top 10 window installers in St. Thomas at a glance

Top 10 window installers in St. Thomas at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Brookstone Windows & Doors894.7★ (442)London, 17 km awaySat · Sun · EveningsOverall
2Accurate Window Cleaners884.9★ (213)London, 26 km away24/7Emergencies
3Jacob's Crystal Clear Window Cleaning865.0★ (81)London, 23 km away24/7—
4Krystal Klear Windows835.0★ (88)Cambridge, 59 km away24/7—
5A1 Unique Installations824.7★ (54)St. ThomasSat—
6AllFix London Windows & Doors825.0★ (3)London, 17 km away24/7—
7Heritage Renovations824.4★ (298)London, 17 km awaySatMost reviews
8Douglas Window & Door Inc.814.9★ (271)London, 23 km away——
9Blake Exteriors Window and Door804.8★ (251)London, 25 km away——
10Banman Windows & Doors805.0★ (31)London, 23 km awaySat · Evenings—

The 70 best window installers in St. Thomas, ranked

Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.

Scores below: based on 6 of 8 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  1. Ranked #1 in St. Thomas

    #1 Brookstone Windows & Doors

    Based in London, 17 km away

    89/100CR Score

    Ranked #1 because of its Google rating and review volume: 4.7★ from 442 Google reviews, the most Google reviews on this list (442).

    • 4.7★ from 442 Google reviews
    Hours
    Mon–Thu 8 AM–8 PM · Fri 8 AM–4:30 PM · Sat 9 AM–6 PM · Sun 9 AM–5 PM
    Address
    45 Meg Dr, London, ON N6E 2V2
    View profile for Brookstone Windows & Doors(519) 400-7000

  5. #5 A1 Unique Installations

    Based in St. Thomas

    82/100CR Score

    Ranked #5 because of its Google rating and trade focus: 4.7★ from 54 Google reviews, listed on Google as “Window installation service”.

    • 4.7★ from 54 Google reviews
    Hours
    Mon–Fri 8 AM–5 PM · Sat 9 AM–12 PM · Sun closed
    Address
    16 Barrie Blvd #5, St Thomas, ON N5P 4B9
    View profile for A1 Unique Installations(519) 631-8183

  7. #7 Heritage Renovations

    Based in London, 17 km away

    82/100CR Score

    Ranked #7 because of its Google rating and trade focus: 4.4★ from 298 Google reviews, listed on Google as “Window installation service”.

    • 4.4★ from 298 Google reviews
    Hours
    Mon–Fri 9 AM–5 PM · Sat 10 AM–2 PM · Sun closed
    Address
    583 Exeter Rd, London, ON N6E 2Z2
    View profile for Heritage Renovations(519) 652-1575

  10. #10 Banman Windows & Doors

    Based in London, 23 km away

    80/100CR Score

    Ranked #10 because of its Google rating and trade focus: 5.0★ from 31 Google reviews, listed on Google as “Window installation service”.

    • 5.0★ from 31 Google reviews
    Hours
    Mon–Thu 9 AM–7 PM · Fri 9 AM–4 PM · Sat 10 AM–4 PM · Sun closed
    Address
    435 Springbank Dr, London, ON N6J 1H2
    View profile for Banman Windows & Doors(519) 902-9003

  13. #13 Glass Canada

    Based in London, 18 km away

    79/100CR Score

    Ranked #13 because of its Google rating and trade focus: 4.6★ from 206 Google reviews, listed on Google as “Window installation service”.

    • 4.6★ from 206 Google reviews
    Hours
    Mon–Fri 8 AM–4:30 PM · Sat–Sun closed
    Address
    330 Exeter Rd A, London, ON N6L 1A3
    View profile for Glass Canada(519) 642-4100

  20. #20 Aluminum Associates

    Based in London, 24 km away

    78/100CR Score

    Ranked #20 because of its Google rating and trade focus: 4.5★ from 169 Google reviews, listed on Google as “Window installation service”.

    • 4.5★ from 169 Google reviews
    Hours
    Mon–Fri 8 AM–5 PM · Sat–Sun closed
    Address
    1801 Trafalgar St, London, ON N5W 1X7
    View profile for Aluminum Associates(519) 453-6400

  22. #22 Homecastle

    Based in London, 26 km away

    77/100CR Score

    Ranked #22 because of its Google rating and trade focus: 4.2★ from 39 Google reviews, listed on Google as “Window installation service”.

    • 4.2★ from 39 Google reviews
    Hours
    Mon–Fri 8 AM–5:30 PM · Sat 10 AM–2 PM · Sun closed
    Address
    535 First St, London, ON N5V 1Z3
    View profile for Homecastle(519) 659-3550

  25. #25 Direct Impact Auto Glass

    Based in London, 20 km away

    77/100CR Score

    Ranked #25 because of its Google rating and trade focus: 4.2★ from 54 Google reviews, listed on Google as “Window installation service”.

    • 4.2★ from 54 Google reviews
    Hours
    Mon–Fri 8 AM–5 PM · Sat 8 AM–12 PM · Sun closed
    Address
    located within Storage Mart, 1020 Wonderland Rd S #2246, London, ON N6K 3S4
    View profile for Direct Impact Auto Glass(226) 271-7394

How much do window installers cost in St. Thomas?

US national ranges converted to CAD, not adjusted for St. Thomas. Each row names its basis and the month we checked it.

How much do window installers cost in St. Thomas?
JobLowTypicalHighBasisChecked
Window replacementCA$4,830CA$10,330CA$16,640Per 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

How we ranked St. Thomas window installers

We scored 70 St. Thomas 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.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed fromIn St. Thomas data
Reputation35%Bayesian-adjusted Google star ratingMeasured
Credentials15%Active state license 0.6, bond 0.2, workers’ comp 0.2Not yet collected
Review volume10%log10(reviews + 1) against the list maximumMeasured
Recency10%Share of reviews from the last 12 monthsNot yet collected
Availability10%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%Google main category 1.0, business name 0.7, additional category 0.5Measured
Proximity5%1.0 when based in the city, falling to 0 at the trade’s radiusMeasured
Completeness5%Website, photos, description, hours, claimed profile (0.2 each)Measured

Window installers in St. Thomas: frequently asked questions

Who is the best window installer in St. Thomas?

By CR Score, the highest-ranked window installer in St. Thomas, ON is Brookstone Windows & Doors with a CR Score of 89/100. It has 4.7★ from 442 Google reviews. It is open 7 days a week. Accurate Window Cleaners (#2) and Jacob's Crystal Clear Window Cleaning (#3) follow. We ranked 70 window installers on 8 factors, last updated October 22, 2026.

How many window installers are there in St. Thomas?

ContractorsRanked ranks 70 window installers serving St. Thomas, ON. 1 of them is based in St. Thomas; the rest serve it from nearby towns. Counts are as of October 2026.

Which window installers in St. Thomas are open 24/7?

8 ranked window installers in St. Thomas post 24/7 hours. The highest-ranked are Accurate Window Cleaners (#2), Jacob's Crystal Clear Window Cleaning (#3) and Krystal Klear Windows (#4). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which window installers in St. Thomas work on weekends?

29 of 70 ranked window installers post Saturday hours and 12 post Sunday hours. The highest-ranked open Saturdays are Brookstone Windows & Doors (#1), Accurate Window Cleaners (#2) and Jacob's Crystal Clear Window Cleaning (#3). Posted hours are office hours; crews may book weekend jobs separately.

How much does window replacement cost in St. Thomas?

Window replacement typically costs CA$4,830 to CA$16,640, with CA$10,330 typical (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)). This is a national range, not adjusted for St. Thomas. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do St. Thomas window installers have?

The median Google rating among 70 rated window installers in St. Thomas is 4.8★, with a median of 29 reviews. Brookstone Windows & Doors has the most, 442 reviews, and ranks #1. We adjust ratings for review count, so a few five-star reviews cannot top the list.

How does ContractorsRanked rank window installers?

Each window installer gets a 0–100 CR Score from 8 published factors, led by reputation (35%), credentials (15%), review volume (10%) and recency (10%). Factors we cannot measure are left out, not scored as zero. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.

Do window installers outside St. Thomas count in this ranking?

Yes, if they are within 64 km of the St. Thomas city centre, our service radius for window installers. Each listing shows where the business is based and how far away it is. Proximity is 5% of the CR Score, so a nearby business gets a small edge.

Update log for St. Thomas

  1. October 2026: CR Scores recalculated for 70 window installers serving St. Thomas.

More window installers and St. Thomas pages

Other trades in St. Thomas