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24 companies listed · 4 in Thornhill · 2 open 24/7 · 17 open weekends · 19 rated 4.5+
Data verified October 18, 2026
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.
4 of the 24 companies we list are based in Thornhill; the other 20 serve Thornhill from towns including Markham, Toronto and Aurora. The companies on this page are rated from 4.1 to 5.0 across 1,662 reviews; 15 have 50 or more reviews and 19 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (95%), quality (79%) and responsiveness (77%). The topics that come up most in reviews of the companies on this page are "price", "estimates" and "efficient". 2 are open around the clock; 17 are open on Saturdays and 9 on Sundays. Domain records put 16 websites of the companies on this page at ten or more years old; the oldest dates from 1997. 2 offer emergency call-outs; 2 offer financing or payment plans; 11 give free estimates; 2 are 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; 22 publish a contact page; 20 list a public email and 1 takes 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.
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.
