51 window installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in South Portland: Portland Glass of Portland, CR Score 61/100; 4.7★ from 341 Google reviews; open Saturdays until 12 PM.
Best for emergencies (open 24/7): Maine Windows and Doors, posts 24/7 hours; ranked #5 of 51.
Most-reviewed: Renewal by Andersen Window Replacement, 1,057 Google reviews at 4.8★, the most of 51 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
51 South Portland window installers are ranked here by CR Score, from ten published factors. 4 are open 24/7, 30 open Saturdays and 12 open Sundays, based on posted hours. The median Google rating is 4.8★ across 51 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Portland Glass of Portland | 61 | 4.7★ (341) | Portland, 2 mi away | Sat | Overall |
| 2 | Renewal by Andersen Window Replacement | 60 | 4.8★ (1,057) | Saco, 13 mi away | — | Most reviews |
| 3 | Regal Replacement Windows | 60 | 4.9★ (40) | Portland, 4 mi away | Sat · Sun · Evenings | — |
| 4 | Portland Glass of Biddeford | 59 | 4.9★ (181) | Biddeford, 15 mi away | Sat | — |
| 5 | Maine Windows and Doors | 58 | 3.9★ (25) | Portland, 5 mi away | 24/7 | Emergencies |
| 6 | Portland Glass of Brunswick | 57 | 4.8★ (213) | Brunswick, 25 mi away | Sat | — |
| 7 | A Plus Windows | 57 | 5.0★ (169) | South Berwick, 26 mi away | 24/7 | — |
| 8 | Window World of Southern Maine | 57 | 4.4★ (123) | Westbrook, 6 mi away | Sat | — |
| 9 | A-BEST Window | 57 | 4.6★ (91) | South Portland | — | — |
| 10 | Portland Glass of Springvale & Sanford | 56 | 4.9★ (115) | Sanford, 30 mi away | Sat | — |
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: 4.7★ from 341 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saco, 13 mi away
Ranked #2 because of its Google rating and review volume: 4.8★ from 1,057 Google reviews, the most in South Portland.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Portland, 4 mi away
Ranked #3 because of its Google rating and trade focus: 4.9★ from 40 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Biddeford, 15 mi away
Ranked #4 because of its Google rating and trade focus: 4.9★ from 181 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Portland, 5 mi away
Ranked #5 because of its Google rating and trade focus: 3.9★ from 25 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Brunswick, 25 mi away
Ranked #6 because of its Google rating and trade focus: 4.8★ from 213 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in South Berwick, 26 mi away
Ranked #7 because of its Google rating and review volume: 5.0★ from 169 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Westbrook, 6 mi away
Ranked #8 because of its Google rating and trade focus: 4.4★ from 123 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in South Portland
Ranked #9 because of its Google rating and trade focus: 4.6★ from 91 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Sanford, 30 mi away
Ranked #10 because of its Google rating and trade focus: 4.9★ from 115 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in South Portland
Ranked #11 because of its Google rating and review volume: 4.9★ from 222 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Gorham, 20 mi away
Ranked #12 because of its Google rating and trade focus: 4.8★ from 145 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Lewiston, 31 mi away
Ranked #13 because of its Google rating and trade focus: 4.6★ from 134 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Buxton, 5 mi away
Ranked #14 because of its Google rating and trade focus: 4.6★ from 9 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Portland, 5 mi away
Ranked #15 because of its Google rating and review volume: 4.9★ from 69 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Portland, 6 mi away
Ranked #16 because of its Google rating and review volume: 4.7★ from 186 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Gorham, 8 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Buxton, 11 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 17 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Gorham, 14 mi away
Ranked #19 because of its Google rating and trade focus: 4.8★ from 22 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Portland, 5 mi away
Ranked #20 because of its Google rating and review volume: 4.8★ from 72 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Buxton, 7 mi away
Ranked #21 because of its Google rating and review volume: 5.0★ from 49 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Biddeford, 16 mi away
Ranked #22 because of its Google rating and trade focus: 3.7★ from 6 Google reviews, listed on Google as “Window installation service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Biddeford, 19 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Biddeford, 6 mi away
Ranked #24 because of its Google rating and trade focus: 3.4★ from 23 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Kennebunk, 31 mi away
Ranked #25 because of its Google rating and trade focus: 4.7★ from 53 Google reviews, listed on Google as “Window installation service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Typical prices in USD, adjusted for Maine with a published regional index. Each row names its basis and month.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Window replacement | $3,410 | $7,300 | $11,760 | Per project (several windows): typical range of customer-reported projects. US national range × 0.99 New England factor (2025 Cost vs. Value Report) | October 2026 |
We scored 51 South Portland 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 South Portland 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 |