Flair Cleaners
“I'm leaving this review because they are a neighbourhood small business and, in my opinion, deserve the recognition for being such a valuable addition to this neighbourhood!”
Best Commercial & Office Cleaning in Thornhill, ON
24 companies listed · 4 in Thornhill · 14 open 24/7 · 19 open weekends · all 24 rated 4.5+
Data verified October 19, 2026
M.C. Janitorial Systems
“The company has excellent quality service and offers the best rates for cleaning services 👌 …”
Silo Clean International Inc
Quality Housekeeping Toronto
“One of Maria's greatest qualities is flexibility in adapting to our timetable.”
99 Nice House Cleaning Services Toronto
“Pays very close attention to details.”
A&R Home Cleaning
“They were friendly and courteous and did an amazing job cleaning our house and making it look great as we were listing the house for sale.”
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.
Area overview: Thornhill, ON
4 of the 24 companies we list are based in Thornhill; the other 20 serve Thornhill from towns including Toronto, Mississauga and Markham. The companies on this page are rated from 4.5 to 5.0 across 4,125 reviews; 18 have 50 or more reviews. When customers rate these companies on specific qualities, they most often praise professionalism (85%), quality (83%) and responsiveness (67%). The topics that come up most in reviews of the companies on this page are "price", "communication" and "efficient". 14 are open around the clock; 19 are open on Saturdays and 15 on Sundays. The services the companies on this page list most often on their websites are commercial cleaning (3), maid services (2) and window cleaning (2). 1 shows a licence on its website and 1 lists staff certifications (IICRC). 7 have ten or more years of experience, the longest 28 years. 14 offer emergency call-outs; 14 give free estimates; 4 are family- or locally-owned and 3 list coupons or special offers. We have a website on file for all 24 of the companies on this page; 21 publish a contact page; 22 list a public email and 8 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.
Do any of these companies clean around the clock?
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.
Dhyana Cleaning
“I have been using Dhyana cleaning for monthly cleaning for the past few months and have been happy with the quality of their cleaning service, and impressed by their responsiveness and flexibility for last minute scheduling adjustments.”
Tidy Titans
“I had hired them for a deep clean of my home and could not recommend highly enough.”
The Fresh Cleaning
“Very very good and great cleaning”
Facility Plus
“I'm a contractor for Facility Plus and they are exactly the type of company I like doing business with, professional, organized, and quality work.”
Longividade Cleaning Services Inc.
“Longividade Cleaning Services spoke with us on the phone at noon and had a crew on site within a few hours.”
Eh! Maids
“They sent 2 ladies who cleaned my place thoroughly.”
Toronto Home Cleaners
“I appreciate the extra effort in making this turn out to be a great experience.”
Eco Scrubbed Residential and Commercial Cleaners Markham
“Renata and Andriena did such a fabulous job and they had to clean teenage girls rooms (that's a feat in itself).”
Pamir Carpet Cleaning
“Pamir carpet cleaning what a wonderful job u all guys magnificent i would recommend to everyone good service great thanks a million”
Arelli Office Cleaning & Commercial Cleaning Services
“I recently used Arelli's carpet cleaning services and was blown away by the results.”
Toronto Shine Cleaning
“The helper was very calm, patient and knew how to get things done.”
Seeyonclean East End (Gta)
“Adhi and team did an amazing job on the move out cleaning.”
Now It's Clean
“We hired 2 cleaners for a 4 hour deep clean; they did a great job on the kitchen and bathrooms, and arrived on time.”
Palmiye Upholstery & Carpet Cleaning
“Very good company for cleaning carpets and couches, I would reccomend them without any hesitation, best service in the city.”
Elite Housekeeping
“Worth the money you spend , as a single lady she cleaned the whole unit 👍👏👌 …”
Whiterose Janitorial Services Ltd.
“She is an admirable person in what she does, she is able to resolve our needs in a timely manner and many times she anticipates them and resolves them; That way she maintains control and balance of the work.”
New Century Maids
“From start to finish everything was handled with professionalism and pride.”
Prolific Cleaning
“Walls, baseboards, windows ,appliances etc everything was neatly cleaned.”
Why these companies made our list
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