Ontario has thousands of cleaning providers, but only a handful operate at scale with a track record you can check.
This guide ranks five of the most established commercial cleaners in the province and backs each one with verified data.
| Market snapshot: Ontario’s janitorial services industry is worth about $3.0 billion a year across more than 14,000 businesses (IBISWorld, 2025). Choosing well matters. |
Top 5 at a Glance
| Company | Founded | Type | Ontario Coverage | Best For |
| Impact | 1954 | Family owned | GTA, Toronto to Ajax | GTA offices, medical, industrial |
| GDI | 1926 roots | Public (TSX: GDI) | Province wide, Toronto ops | Large institutions, airports, healthcare |
| Bee-Clean | 1967 | Family owned | SW Ontario, GTA, Ottawa | Government, multi site, institutional |
| JAN-PRO | 1995 (CA) | Franchise | Toronto, London, Hamilton, Durham | Small to mid offices, clinics, retail |
| Jani-King | 1969 | Franchise | GTA, Southern Ontario | Retail, restaurants, hospitality |
1. Impact Cleaning Services
Best overall for GTA businesses.
Impact started in Toronto in 1954, washing storefront windows for five cents each. Seven decades later it is still family owned and runs full janitorial, office, industrial, healthcare, and post-construction cleaning across the Greater Toronto Area.
Coverage spans Toronto, Mississauga, Brampton, Vaughan, Markham, Oakville, Burlington, Hamilton, and Oshawa. The company uses third-party certified, eco-responsible products and typically returns quotes within 24 hours.
Best for: GTA offices, medical, and industrial sites that want a long-established, locally accountable partner.
2. GDI Integrated Facility Services
Best for large, complex facilities.
GDI trades on the Toronto Stock Exchange under the symbol GDI and traces its roots to 1926. In 2024 it reported revenue of C$2.56 billion (GDI FY2024 results).
Beyond cleaning, GDI handles HVAC, mechanical, and electrical maintenance. That lets airports, hospitals, and office towers use one provider for both cleaning and building systems.
Best for: Large institutions and corporate portfolios that need cleaning plus building maintenance at scale.
3. Bee-Clean Building Maintenance
Best for province-wide coverage.
Founded in 1967 and still family owned, Bee-Clean is the largest Canadian-owned janitorial company, with more than 14,000 employees across 20-plus offices in Canada (company figures, 2022).
In Ontario it covers the southwest, the GTA, and Eastern Ontario. It has also held Canada’s Best Managed Companies status for several years running.
Best for: Government, institutional, and multi-site clients that want one national provider.
4. JAN-PRO
Best franchise option for smaller sites.
JAN-PRO was founded in 1991 by Canadian Jacques Lapointe and has operated in Canada since 1995, now with 29 local offices. Entrepreneur magazine has ranked it the number one commercial cleaning franchise for 15 years running.
Local Certified Business Owners deliver the work, with Ontario offices in Toronto, London, Hamilton, and Durham. Tools include EnviroShield electrostatic disinfection and a service guarantee.
Best for: Small and mid-sized offices, clinics, and retail that want a guaranteed, owner-operated service.
5. Jani-King
Best for retail, restaurants, and multi-location brands.
Founded in 1969 in Oklahoma City, Jani-King describes itself as the world’s largest commercial cleaning franchise.
Jani-King of Southern Ontario has served the GTA for more than 30 years, covering Mississauga, Markham, Brampton, Vaughan, Burlington, Hamilton, and Oshawa, with single-invoice billing across multiple sites.
Best for: Retail, restaurant, and hospitality operators running several GTA locations.
By the Numbers
| Company | Standout data point |
| Impact | More than 70 years in business, since 1954 |
| GDI | C$2.56 billion in 2024 revenue, listed on the TSX (GDI) |
| Bee-Clean | 14,000+ employees, the largest Canadian-owned janitorial firm |
| JAN-PRO | 29 Canadian offices, named #1 cleaning franchise 15 years running (Entrepreneur) |
| Jani-King | Founded in 1969, 30+ years serving Southern Ontario |
Sources: company websites; GDI Q4/FY2024 results (Mar 2025); Entrepreneur Franchise 500; Bee-Clean company statements (2022).
How to Choose: What to Check Before You Sign
| What to check | Why it matters |
| Coverage and capacity | Confirm they can reliably service all your sites, including peak hours. |
| Screening and insurance | Ask about background checks, WSIB coverage, and liability insurance. |
| Custom plan | The best providers tailor scope to your hours, industry, and facility. |
| Certifications and products | Look for green options and recognized standards such as CIMS. |
| Responsiveness | Check quote turnaround and how fast they fix a missed clean. |
Frequently Asked Questions
What is the largest commercial cleaning company in Canada?
Bee-Clean is the largest Canadian-owned janitorial company, with more than 14,000 employees. GDI is the largest publicly traded player, with C$2.56 billion in 2024 revenue.
How much does commercial cleaning cost in Ontario?
There is no fixed provincial rate. Pricing depends on facility size, cleaning frequency, and scope, so most providers offer a free on-site quote.
Do these companies serve the Greater Toronto Area?
Yes. All five operate across the GTA, and several also cover the rest of Ontario.
How big is Ontario’s cleaning industry?
Ontario’s janitorial services industry is worth about $3.0 billion a year and includes more than 14,000 businesses (IBISWorld, 2025).
The Bottom Line
Every company here has earned its place, and the right fit depends on your facility, location, and budget.
For GTA businesses that want a long-established, family-owned partner able to scale from one office to a full portfolio, Impact Cleaning Services is a strong first call. Quotes are usually returned within 24 hours at impact.ca.
Sources
IBISWorld, Janitorial Services in Canada and in Ontario (2025).
Impact Cleaning Services (impact.ca).
GDI Integrated Facility Services, Q4 and full-year 2024 results (March 2025); TSX: GDI.
Bee-Clean Building Maintenance (bee-clean.com); company statements, 2022.
JAN-PRO Canada (jan-pro.ca); Entrepreneur Franchise 500.
Jani-King (janiking.com and janikingso.com).
