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24 companies listed ยท 6 in Thornhill ยท 14 open 24/7 ยท 21 open weekends ยท all 24 rated 4.5+
Data verified October 18, 2026
Listed for businesses in and around Thornhill, ON, these 24 companies hold commercial cleaning contracts. Ask each one for a site walk before it quotes, since square footage alone says nothing about the entrance matting, the washroom count or the winter mess that drives the real workload.
Of the 24 companies we list here, 6 are in Thornhill itself and 18 come from towns including Mississauga (3), North York (3) and Toronto (3). The companies on this page are rated from 4.5 to 5.0 across 3,565 reviews; 17 have 50 or more reviews. When customers rate these companies on specific qualities, they most often praise professionalism (85%), quality (81%) and responsiveness (70%). The topics that come up most in reviews of the companies on this page are "price" and "communication". 14 are open around the clock; 21 are open on Saturdays and 17 on Sundays. The services the companies on this page list most often on their websites are commercial cleaning (2), maid services (2) and window cleaning (2). 2 show a licence on their websites and 1 lists staff certifications (IICRC). 6 have ten or more years of experience, the longest 28 years. 14 offer emergency call-outs; 12 give free estimates; 5 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; 20 publish a contact page; 21 list a public email and 7 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.
Around-the-clock availability is stated by 14 of the 24 commercial cleaning companies here. In this trade that usually means an emergency call out for a flood, a burst pipe or a biohazard rather than a crew standing by, so ask what the after-hours number actually reaches.
