64/100CR Score
Ranked #1 because of its Google rating and review volume: 4.4★ from 133 Google reviews, the most in Cornwall.
Based on 8 of 10 factors; credentials and recency not yet collected.
Best Pool Builders in Cornwall, ON (2026)
12 pool builders ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Cornwall: St. Lawrence Pools, Hot Tubs, Outdoor Furniture + Grills, CR Score 64/100; 4.4★ from 133 Google reviews; open 7 days a week.
- 2
Best for emergencies (open 24/7): 360 Pool Care, posts 24/7 hours; ranked #2 of 12.
- 7
Most-reviewed: Capital City Pool Services, 70 Google reviews at 4.7★, the most of 12 ranked after St. Lawrence Pools, Hot Tubs, Outdoor Furniture + Grills; ranked #7.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
12 Cornwall pool builders are ranked here by CR Score, from ten published factors. 1 is open 24/7, 7 open Saturdays and 3 open Sundays, based on posted hours. The median Google rating is 4.5★ across 12 rated businesses.
Top 10 pool builders in Cornwall at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | St. Lawrence Pools, Hot Tubs, Outdoor Furniture + Grills | 64 | 4.4★ (133) | Cornwall | Sat · Sun | Overall |
| 2 | 360 Pool Care | 62 | 4.7★ (26) | Cornwall | 24/7 | Emergencies |
| 3 | Piscines Campbell Pools | 60 | 4.6★ (47) | Cornwall | Sat | — |
| 4 | SummerHaven | 56 | 4.5★ (53) | Potsdam, 39 km away | Sat | — |
| 5 | Perma Pools | 56 | 4.5★ (32) | Ottawa, 50 km away | Sat · Sun · Evenings | — |
| 6 | Seaway Pools & Patios | 56 | 4.5★ (19) | Cornwall | — | — |
| 7 | Capital City Pool Services | 54 | 4.7★ (70) | Clarence-Rockland, 59 km away | — | Most reviews |
| 8 | Piscines Campbell Pools | 53 | 4.9★ (20) | Clarence-Rockland, 61 km away | — | — |
| 9 | Pro Pool | 52 | 4.4★ (7) | Malone, 41 km away | — | — |
| 10 | Shank Pools | 51 | 4.6★ (20) | Ottawa, 51 km away | — | — |
The 12 best pool builders in Cornwall, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Cornwall
62/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.7★ from 26 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Cornwall
60/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.6★ from 47 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#4 SummerHaven
Based in Potsdam, 39 km away
56/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.5★ from 53 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#5 Perma Pools
Based in Ottawa, 50 km away
56/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.5★ from 32 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Cornwall
56/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.5★ from 19 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Clarence-Rockland, 59 km away
54/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.7★ from 70 Google reviews, listed on Google as “Swimming pool repair service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Clarence-Rockland, 61 km away
53/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.9★ from 20 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
#9 Pro Pool
Based in Malone, 41 km away
52/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.4★ from 7 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
#10 Shank Pools
Based in Ottawa, 51 km away
51/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.6★ from 20 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ogdensburg, 61 km away
50/100CR ScoreRanked #11 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Swimming pool repair service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Massena, 17 km away
48/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.4★ from 10 Google reviews, listed on Google as “Landscaper”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Also serving Cornwall
4 more pool builders 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 |
|---|---|---|
| Gauthier Pool Services | 5.0★ (2) | 53 km |
| Lauzon Pools | 5.0★ (1) | In Cornwall |
| Master Pool Builders | 5.0★ (1) | 51 km |
| MCI Pools | 61 km |
How we ranked Cornwall pool builders
We scored 12 Cornwall pool builders 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 November 3, 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 Cornwall 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 |
Pool builders in Cornwall: frequently asked questions
Who is the best pool builder in Cornwall?
By CR Score, the highest-ranked pool builder in Cornwall, ON is St. Lawrence Pools, Hot Tubs, Outdoor Furniture + Grills with a CR Score of 64/100. It has 4.4★ from 133 Google reviews. It is open 7 days a week. 360 Pool Care (#2) and Piscines Campbell Pools (#3) follow. We ranked 12 pool builders on ten factors, last updated November 3, 2026.
How many pool builders are there in Cornwall?
ContractorsRanked ranks 12 pool builders serving Cornwall, ON. 4 of them are based in Cornwall; the rest serve it from nearby towns. Another 4 within 64 km are listed but not ranked yet. Counts are as of November 2026.
Which pool builders in Cornwall are open 24/7?
1 ranked pool builder in Cornwall posts 24/7 hours. The highest-ranked is 360 Pool Care (#2). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which pool builders in Cornwall work on weekends?
7 of 12 ranked pool builders post Saturday hours and 3 post Sunday hours. The highest-ranked open Saturdays are St. Lawrence Pools, Hot Tubs, Outdoor Furniture + Grills (#1), 360 Pool Care (#2) and Piscines Campbell Pools (#3). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Cornwall pool builders have?
The median Google rating among 12 rated pool builders in Cornwall is 4.5★, with a median of 23 reviews. St. Lawrence Pools, Hot Tubs, Outdoor Furniture + Grills has the most, 133 reviews, and ranks #1. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ContractorsRanked rank pool builders?
Each pool builder gets a 0–100 CR Score from ten published factors, led by reputation (25%), credentials (15%), review volume (10%) and trade focus (10%). A business with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Do pool builders outside Cornwall count in this ranking?
Yes, if they are within 64 km of the Cornwall city centre, our service radius for pool builders. 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.
Can pool builders pay to rank higher on ContractorsRanked?
No. The CR Score never reads payment status, and this ranking has 0 paid placements. Up to 3 Featured businesses may appear above the list, labelled Featured and showing their honest rank.
Update log for Cornwall
- November 2026: CR Scores recalculated for 12 pool builders serving Cornwall.
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