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3 of these companies are based in Thornhill; the others serve Thornhill from towns including Toronto, Etobicoke and Mississauga.
5 open 24/7 · 15 open weekends · 23 rated 4.5+
Data verified October 18, 2026
Listed for homeowners in and around Thornhill, ON, these 24 companies clean windows. Spring fills up fast here, so ask which weeks are still open and whether taking down and washing storm windows and screens is part of the price or an extra.
The 24 companies on this page are rated from 4.4 to 5.0 across 3,012 reviews; 21 have 50 or more reviews and 23 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (91%), quality (85%) and responsiveness (71%). The topics that come up most in reviews of the companies on this page are "price", "communication" and "efficient". 5 are open around the clock; 15 are open on Saturdays and 14 on Sundays. The services the companies on this page list most often on their websites are commercial window cleaning (6), eavestrough cleaning (6), window cleaning (6), residential window cleaning (5) and power washing (4). Domain records put 2 websites of the companies on this page at ten or more years old; the oldest dates from 2004. 6 offer emergency call-outs; 17 give free estimates; 2 are family- or locally-owned and 4 list coupons or special offers. We have a website on file for 23 of the companies on this page; 18 publish a contact page; 21 list a public email and 5 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.
This page shows 24 listings for Thornhill. Because the work is sold as a repeat visit, ask each one which part of town it already covers and on what cycle. Slotting into an existing route usually costs less than a company driving out for a single house.
