Popular Cities
2 of these contractors are based in Thornhill; the others serve Thornhill from towns including Richmond Hill, Etobicoke and Markham.
1 open 24/7 · 17 open weekends · 22 rated 4.5+ · 3 show a licence
Data verified October 19, 2026
The 24 contractors listed for Thornhill, ON handle in-season care along with openings and closings. Book the closing early. The weeks when the weather turns are the same weeks every pool owner is trying to get on the same schedule.
The 24 contractors on this page are rated from 3.8 to 5.0 across 1,626 reviews; 14 have 50 or more reviews and 22 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (93%), responsiveness (75%) and quality (74%). The topics that come up most in reviews of the contractors on this page are "price", "communication" and "knowledge". 1 is open around the clock; 17 are open on Saturdays and 6 on Sundays. The services the contractors on this page list most often on their websites are pool closing (2), pool opening (2) and pool renovations (2). 3 show a licence on their websites. Domain records put 13 websites of the contractors on this page at ten or more years old; the oldest dates from 1998. 1 offers emergency call-outs; 2 offer financing or payment plans; 6 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 contractors on this page; 21 publish a contact page; 17 list a public email and 3 take bookings online. We count these figures across the contractors on this page; hours and prices change, so confirm the details with the contractor before you book.
3 of the 24 listings on this page show a licence on their websites. Municipal business licensing and provincial trade tickets are separate things, and water treatment certificates come from industry bodies. Ask which the company holds, then confirm it with the issuer rather than taking the logo at face value.
