Best Commercial & Office Cleaning in Markham, ON
15 companies listed · 12 in Markham · 4 open 24/7 · 9 open weekends · 11 rated 4.5+
Data verified October 18, 2026
Mona Cleaning
Lowfare Commercial Maintenance
Zusashi Maintenance Company
Associated Pro Cleaning
The Cleaning Company
Listed for businesses in and around Markham, ON, these 15 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.

Area overview: Markham, ON
12 of the 15 companies we list are based in Markham; the other 3 serve Markham from Richmond Hill (14 km) and Scarborough (15 km). The companies on this page are rated from 3.9 to 5.0 across 335 reviews; 4 have 50 or more reviews and 11 are rated 4.5 or higher. 4 are open around the clock; 9 are open on Saturdays and 7 on Sundays. 1 shows a licence on its website and 1 lists staff certifications (IICRC). 4 have ten or more years of experience, the longest 24 years. 4 offer emergency call-outs; 5 give free estimates; 2 are family- or locally-owned and 2 list coupons or special offers. We have a website on file for 13 of the companies on this page; 11 publish a contact page; 11 list a public email and 3 take bookings online. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
Does a contractor need an address in Markham?
An address in Markham is given by 12 of the 15 commercial cleaning companies here; the others come from other towns within 15 km. For nightly work, the supervisor's drive matters more than the office address, since a site that is an hour from the nearest manager gets inspected less often.