International Pool & Spa Centers Thornhill
“Spencer helped me out and I really appreciated the sincerity and honesty.”
Best Swimming Pool Builders near Thornhill, ON
3 of these companies are based in Thornhill; the others serve Thornhill from towns including North York, Markham and Mississauga.
17 open weekends · all 24 rated 4.5+ · 1 shows a licence
Data verified October 18, 2026
Ontario Pool Service
“I highly recommend Ontario Pool Service for anyone wanting a beautiful pool makeover.”
Robcon Pools
“If you thinking of hiring a pool company I strongly recommend Robcon.”
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People For Pools
“We have been using People for Pools for three years now and they are very reliable and knowledgeable.”
Olympic Pool Services
“Very impressed with their communication and clean work.”
MW Contracting Corp
“His service is improving every year and he is very prompt to respond”
The 24 companies listed for Thornhill, ON build new pools. The construction window is short in this climate, so ask early where you would sit in the schedule and which stages would run into fall if the start date slips by a few weeks.
Area overview: Thornhill, ON
The 24 companies on this page are rated from 4.5 to 5.0 across 2,379 reviews; 19 have 50 or more reviews. When customers rate these companies on specific qualities, they most often praise professionalism (98%), quality (76%) and responsiveness (75%). The topics that come up most in reviews of the companies on this page are "price", "communication" and "knowledge". 17 are open on Saturdays and 5 on Sundays. The services the companies on this page list most often on their websites are pool renovation (3), pool closing (2), pool construction (2) and pool opening (2). 1 shows a licence on its website. Domain records put 13 websites of the companies on this page at ten or more years old; the oldest dates from 1997. 1 offers financing or payment plans; 12 give free estimates; 1 is family- or locally-owned and 1 lists coupons or special offers. We have a website on file for all 24 of the companies on this page; 23 publish a contact page; 22 list a public email and 4 take bookings online. We count these figures across the companies on this page; hours and prices change, so confirm the details with the company before you book.
What can a builder's own website tell me?
All 24 listings here link to a website. Look for completed projects in this climate, the shell types they build, and whether the work is done by their own crews. Galleries are curated, so ask to see a pool that has been through several winters instead of one finished in the summer.
Swim Clean Pool Service Inc
“He recommends what the best is for you and your pool, he gets the job done professionally and effectively and he is the man of his words.”
Ace Pools
“I called Ace Pools and staff there listened to my concern, although they are very busy during this time of the season , they do their best to schedule us in , job was done efficiently and all debris removed.”
Kenneth Morgan Pools & Landscaping
“The transformation of my outdoor space is nothing short of amazing - the interlocking pavers and landscaping have added beauty, functionality, and value to my property.”
Mayascapes Pools
“If anyone is intimidated with the upkeep of a pool, or need anything pool related, they are the ones to contact!”
Blue Planet Pool
“They transformed it into a safe and non-slippery zone, making it a pleasant and secure experience to walk on.”
Tecum Pools and Spa Ltd.
“! i look forward to spring opening with you and your charges are reasonable especially for a senior like me”
YR Pools and Construction
“I called Judy in service department for closing my pool and she was very kind and helpful,she sent the gentleman name's( Jason ) with his crew and they are professional and friendly”
Plasterrock Pools
“When they started the pool, the onsite team worked so great together and did an amazing job.”
Bancheri Bros. Interlocking and Paving Corp.
“Charlie was always responsive and always made sure the project went smooth.”
Paradise Views Landscaping
“The responsiveness he demonstrated during the emergency repair/replacement of my 9-foot backyard fence after a windstorm was truly appreciated.”
Canadian Poolscapes
“Had to relocate my pool equipment and these guys did the job well and on time.”
Precision Landscaping
“They came highly recommended by friends, and provided a concrete pool, outdoor kitchen, and cabana, thus providing the perfect landscape design to complete our backyard oasis!”
Leisure Pools
“Art and the company as a whole stood by their work and were responsive to questions I had years after installation.”
M.E. Contracting
“After deliberating about what I wanted, I was finally scheduled to begin mid July and 4 days later I had a new retaining wall against my driveway and a new cobblestone backyard patio.”
Bremner Pool and Spa
“The pool was leaking water and Bremner Pool quickly identified the cause by running a sound diagnosis.”
Pool Craft
“Poolcraft did an amazing job building our pool and making our backyard our oasis!”
Summertime Pool Services
“I have recommended Summertime to other friends for a liner and winter cover and they are also very happy with Vern and his Team”
Poolmaster Canada Inc
“I feel like the team has become part of my family, and I'll always have a soft spot in my heart for everyone here!”
Why these companies made our list
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