92/100CR Score
Ranked #1 because of its Google rating and availability: 4.7★ from 21 Google reviews, open 24/7.
- 4.7★ from 21 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Best Window Installers in Great Falls, MT (2026)
5 window installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Great Falls: Derek Ferdinand Masonry, CR Score 92/100; 4.7★ from 21 Google reviews; open 24/7.
- 4
Most-reviewed: Irvin Built Construction, 41 Google reviews at 4.9★, the most of 5 ranked; ranked #4.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
5 Great Falls window installers are ranked here by CR Score, from 8 published factors. 1 is open 24/7, 1 open Saturdays and 1 open Sundays, based on posted hours. The median Google rating is 4.7★ across 5 rated businesses.
Top 5 window installers in Great Falls at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Derek Ferdinand Masonry | 92 | 4.7★ (21) | Great Falls | 24/7 | Overall |
| 2 | Anderson Glass Doors & Windows | 83 | 4.7★ (30) | Great Falls | — | — |
| 3 | Titan Glass | 80 | 5.0★ (10) | Great Falls | — | — |
| 4 | Irvin Built Construction | 78 | 4.9★ (41) | Great Falls | — | Most reviews |
| 5 | H J Gilchrist & Co | 70 | 3.9★ (7) | Great Falls | — | — |
The 5 best window installers in Great Falls, 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.
Based in Great Falls
83/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.7★ from 30 Google reviews, listed on Google as “Window installation service”.
- 4.7★ from 30 Google reviews
- Hours
- Mon–Fri 8 AM–4:30 PM · Sat–Sun closed
- Address
- 624 3rd St S, Great Falls, MT 59405
#3 Titan Glass
Based in Great Falls
80/100CR ScoreRanked #3 because of its Google rating and trade focus: 5.0★ from 10 Google reviews, listed on Google as “Window installation service”.
- 5.0★ from 10 Google reviews
- Hours
- Mon–Fri 8 AM–6 PM · Sat–Sun closed
- Address
- 1132 25th Ave NE unit 1, Black Eagle, MT 59414
Based in Great Falls
78/100CR ScoreRanked #4 because of its Google rating and review volume: 4.9★ from 41 Google reviews, the most Google reviews on this list (41).
- 4.9★ from 41 Google reviews
- Hours
- Mon–Fri 8 AM–6 PM · Sat–Sun closed
Based in Great Falls
70/100CR ScoreRanked #5 because of its Google rating and review volume: 3.9★ from 7 Google reviews, 7 Google reviews.
- 3.9★ from 7 Google reviews
- Hours
- Mon–Fri 8 AM–5 PM · Sat–Sun closed
- Address
- 2715 2nd Ave N, Great Falls, MT 59405
How much do window installers cost in Great Falls?
Typical prices in USD, adjusted for Montana with a published regional index. Each row names its basis and month.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Window replacement | $3,290 | $7,050 | $11,350 | Per project (several windows): typical range of customer-reported projects. US national range × 0.96 Mountain factor (2025 Cost vs. Value Report) | October 2026 |
How we ranked Great Falls window installers
We scored 5 Great Falls 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 Great Falls 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 |
Window installers in Great Falls: frequently asked questions
Who is the best window installer in Great Falls?
By CR Score, the highest-ranked window installer in Great Falls, MT is Derek Ferdinand Masonry with a CR Score of 92/100. It has 4.7★ from 21 Google reviews. It is open 24/7. Anderson Glass Doors & Windows (#2) and Titan Glass (#3) follow. We ranked 5 window installers on 8 factors, last updated October 22, 2026.
How many window installers are there in Great Falls?
ContractorsRanked ranks 5 window installers serving Great Falls, MT. 5 of them are based in Great Falls; the rest serve it from nearby towns. Counts are as of October 2026.
Which window installers in Great Falls are open 24/7?
1 ranked window installer in Great Falls posts 24/7 hours. The highest-ranked is Derek Ferdinand Masonry (#1). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which window installers in Great Falls work on weekends?
1 of 5 ranked window installers post Saturday hours and 1 post Sunday hours. The highest-ranked open Saturdays is Derek Ferdinand Masonry (#1). Posted hours are office hours; crews may book weekend jobs separately.
How much does window replacement cost in Great Falls?
Window replacement typically costs $3,290 to $11,350, with $7,050 typical (Per project (several windows): typical range of customer-reported projects. US national range × 0.96 Mountain factor (2025 Cost vs. Value Report)). The range is adjusted for Montana. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Great Falls window installers have?
The median Google rating among 5 rated window installers in Great Falls is 4.7★, with a median of 21 reviews. Irvin Built Construction has the most, 41 reviews, and ranks #4. 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 Great Falls count in this ranking?
Yes, if they are within 40 mi of the Great Falls city center, 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 Great Falls
- October 2026: CR Scores recalculated for 5 window installers serving Great Falls.
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