62/100CR Score
Ranked #1 because of its Google rating and trade focus: 4.9★ from 171 Google reviews, listed on Google as “Swimming pool repair service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Best Pool Builders in Markham, ON (2026)
338 pool builders ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Markham: Diver Dave Pool Leak Detection, CR Score 62/100; 4.9★ from 171 Google reviews.
- 10
Best for emergencies (open 24/7): OnParLandscaping Ltd. | Landscape Designers and Contractors, posts 24/7 hours; ranked #10 of 338.
- 18
Most-reviewed: International Pool & Spa Centres, 650 Google reviews at 4.6★, the most of 338 ranked; ranked #18.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
338 Markham pool builders are ranked here by CR Score, from ten published factors. 29 are open 24/7, 215 open Saturdays and 104 open Sundays, based on posted hours. The median Google rating is 4.8★ across 338 rated businesses.
Top 10 pool builders in Markham at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Diver Dave Pool Leak Detection | 62 | 4.9★ (171) | Milton, 4 km away | — | Overall |
| 2 | PlasterRock Pools - Concrete Pool Surface Experts | 61 | 5.0★ (95) | Richmond Hill, 18 km away | Sat · Sun · Evenings | — |
| 3 | Swim Clean Pool Service Inc | 61 | 4.9★ (181) | Vaughan, 16 km away | Sat · Evenings | — |
| 4 | WEST COVE POOLS | 60 | 4.9★ (373) | Oshawa, 30 km away | Sat | — |
| 5 | Premier Pool Group | 60 | 4.9★ (229) | Mississauga, 42 km away | Sat · Sun · Evenings | — |
| 6 | Seaway Pools & Hot Tubs | 60 | 4.3★ (120) | Markham | Sat · Sun | — |
| 7 | Lakeshore Pools and Hot Tubs | 60 | 4.9★ (280) | Mississauga, 42 km away | Sat · Sun | — |
| 8 | Blue Planet Pool | 60 | 4.8★ (62) | Richmond Hill, 14 km away | Sat · Sun · Evenings | — |
| 9 | MW Contracting Corp | 59 | 4.9★ (52) | Markham | Sat · Evenings | — |
| 10 | OnParLandscaping Ltd. | Landscape Designers and Contractors | 59 | 4.9★ (59) | Etobicoke, 36 km away | 24/7 | Emergencies |
The 338 best pool builders in Markham, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Based in Richmond Hill, 18 km away
61/100CR ScoreRanked #2 because of its Google rating and trade focus: 5.0★ from 95 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Vaughan, 16 km away
61/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.9★ from 181 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa, 30 km away
60/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.9★ from 373 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Mississauga, 42 km away
60/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.9★ from 229 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Markham
60/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.3★ from 120 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Mississauga, 42 km away
60/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.9★ from 280 Google reviews, listed on Google as “Swimming pool repair service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Richmond Hill, 14 km away
60/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.8★ from 62 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Markham
59/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.9★ from 52 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Etobicoke, 36 km away
59/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.9★ from 59 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Toronto, 64 km away
59/100CR ScoreRanked #11 because of its Google rating and trade focus: 5.0★ from 150 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ajax, 20 km away
59/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.6★ from 105 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Markham
59/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.3★ from 213 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#14 AquaCare Pools
Based in Markham
59/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 10 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Richmond Hill, 5 km away
59/100CR ScoreRanked #15 because of its Google rating and trade focus: 5.0★ from 45 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Markham
59/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.5★ from 115 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#17 Easy pools
Based in Vaughan, 17 km away
59/100CR ScoreRanked #17 because of its Google rating and trade focus: 5.0★ from 39 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Barrie, 61 km away
59/100CR ScoreRanked #18 because of its Google rating and review volume: 4.6★ from 650 Google reviews, the most in Markham.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pickering, 13 km away
59/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.9★ from 172 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Oshawa, 29 km away
59/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.2★ from 407 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Scarborough, 13 km away
59/100CR ScoreRanked #21 because of its Google rating and trade focus: 4.9★ from 77 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#22 FIVE STAR POOLS
Based in Markham
59/100CR ScoreRanked #22 because of its Google rating and trade focus: 4.9★ from 30 Google reviews, listed on Google as “Swimming pool repair service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Oshawa, 32 km away
58/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.8★ from 190 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Toronto, 14 km away
58/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.7★ from 119 Google reviews, listed on Google as “Swimming pool contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#25 Pool Gurus
Based in Markham
58/100CR ScoreRanked #25 because of its Google rating and trade focus: 5.0★ from 32 Google reviews, listed on Google as “Swimming pool repair service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Pool builders ranked #26 to #50
#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 338 ranked pool builders here; the rest are on their profiles.
Also serving Markham
20 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 |
|---|---|---|
| 4Most Energy | 4.9★ (143) | In Markham |
| Ace Pools | In Markham | |
| Andersons Gate Repairs Markham and Installation | 3.7★ (3) | In Markham |
| Bennett Pools | 5.0★ (2) | 19 km |
| Giancola Pools | 5.0★ (2) | 19 km |
| Lean On Me - We Fix Fences - Markham | 5.0★ (9) | In Markham |
| Loomis Landscaping | 5.0★ (6) | In Markham |
| Markham Plumbing | 5.0★ (15) | In Markham |
| Mr. Splash Plumbing of Markham | In Markham | |
| Plumber GTA Of Markham | In Markham | |
| Plumber Markham Express | 5.0★ (53) | In Markham |
| Plumber QuickFix Markham | Drains & Plumbing | 5.0★ (124) | In Markham |
| Pool Boys Build Renovate Service | In Markham | |
| Pool Pal | In Markham | |
| ProTimber Plumbing Markham | 5.0★ (26) | In Markham |
| Qortex Design & Build | 5.0★ (2) | In Markham |
| Rosehill Pools | 4.0★ (2) | In Markham |
| Runsview Landscaping | 5.0★ (26) | In Markham |
| Terrapave | 4.0★ (3) | In Markham |
| Unionville Pools Inc. | 1.0★ (1) | In Markham |
How we ranked Markham pool builders
We scored 338 Markham 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 Markham 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 Markham: frequently asked questions
Who is the best pool builder in Markham?
By CR Score, the highest-ranked pool builder in Markham, ON is Diver Dave Pool Leak Detection with a CR Score of 62/100. It has 4.9★ from 171 Google reviews. PlasterRock Pools - Concrete Pool Surface Experts (#2) and Swim Clean Pool Service Inc (#3) follow. We ranked 338 pool builders on ten factors, last updated November 3, 2026.
How many pool builders are there in Markham?
ContractorsRanked ranks 338 pool builders serving Markham, ON. 10 of them are based in Markham; the rest serve it from nearby towns. Another 20 within 64 km are listed but not ranked yet. Counts are as of November 2026.
Which pool builders in Markham are open 24/7?
29 ranked pool builders in Markham post 24/7 hours. The highest-ranked are OnParLandscaping Ltd. | Landscape Designers and Contractors (#10), Ontario Pool Services (#11) and AquaCare Pools (#14). Hours come from each business's Google listing as of November 2026, so call to confirm.
Which pool builders in Markham work on weekends?
215 of 338 ranked pool builders post Saturday hours and 104 post Sunday hours. The highest-ranked open Saturdays are PlasterRock Pools - Concrete Pool Surface Experts (#2), Swim Clean Pool Service Inc (#3) and WEST COVE POOLS (#4). Posted hours are office hours; crews may book weekend jobs separately.
What Google rating do Markham pool builders have?
The median Google rating among 338 rated pool builders in Markham is 4.8★, with a median of 26 reviews. International Pool & Spa Centres has the most, 650 reviews, and ranks #18. 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 Markham count in this ranking?
Yes, if they are within 64 km of the Markham 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 Markham
- November 2026: CR Scores recalculated for 338 pool builders serving Markham.
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