This guide ranks five of the most established commercial cleaners in the province and backs each one with verified data.

Top 5 at a Glance

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

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

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).

Commercial property damage in Ontario does not wait for business hours. A burst pipe at 3 a.m., a fire mid-shift, or a sudden flood after a storm can shut a business down in minutes. The companies below are the top commercial restoration providers operating across Ontario in 2026, covering water damage, fire and smoke damage, mould remediation, biohazard cleanup, and emergency response for commercial and industrial properties.

The Top 5 Commercial Restoration Companies in Ontario

1. Impact Restore: Best for fast emergency response and insurance documentation

Impact Restore has built its reputation on three things property managers and insurance adjusters consistently call out: fast on-site response, IICRC-certified crews, and the kind of insurance documentation that gets claims paid without weeks of back-and-forth. Their teams work across the full range of commercial restoration disciplines, from water damage and fire damage to mould remediation and biohazard cleanup, with crews trained to work around active business operations so clients can keep doors open during recovery wherever possible.

Who they serve

Commercial and industrial clients across Ontario, including office buildings, warehouses, factories, retail centres, healthcare facilities, manufacturing plants, educational facilities, hotels, restaurants, and public infrastructure.

Commercial restoration services offered

• Commercial water damage restoration and flood cleanup
• Commercial fire and smoke damage restoration
• Commercial mould remediation and mould removal
• Biohazard cleanup and trauma scene cleanup
• Hazardous material abatement, including asbestos and lead
• Storm damage cleanup and emergency board-up services
• Post-construction cleaning for commercial properties

Geographic coverage

Province-wide. Impact Restore handles commercial restoration projects anywhere in Ontario, with the densest crew and equipment footprint in the Greater Toronto Area for fastest response in the region. For larger projects outside the GTA, they deploy teams across the province as needed.

Why they took the top spot

Speed and documentation are the two factors that most often determine whether a commercial loss becomes a smooth claim or a months-long battle. Impact Restore has built its operations around both: a 2-hour on-site response target, IICRC-certified technicians at every level, and a standard documentation package that includes moisture readings, drying logs, before-and-after photos, and detailed scope of work formatted the way commercial insurance adjusters want to see it. For facility managers who have been burned before by slow crews or thin paperwork, that combination is the differentiator.

Key credentials: All technicians IICRC-certified in commercial water damage restoration; 2-hour on-site response target; 24/7 emergency response line; full insurance documentation including moisture readings, drying logs, before-and-after photos, and detailed scope of work for adjusters.

Learn more: impactrestore.ca

2. First Onsite: Best for multi-site portfolios and large-loss reconstruction

First Onsite is Canadian-owned, headquartered in Mississauga, and operates more than 100 branches across Canada and the US with over 2,500 employees. The company is a wholly-owned subsidiary of FirstService Corporation. In Ontario, they have built out a continuous footprint from Ottawa to Windsor along the Highway 401 corridor, including new branches in Peterborough and Pickering opened in 2024, plus a long-standing presence in St. Catharines serving the Niagara region.

Commercial restoration services offered

• Emergency response planning and pre-loss preparation
• Commercial water damage restoration and flood mitigation
• Commercial fire and smoke damage restoration
• Mould remediation and indoor air quality services
• Storm and wind damage restoration
• Full-scale commercial reconstruction services

Geographic coverage

Ottawa to Windsor along the Highway 401 corridor, plus Niagara, the Kawarthas, and Durham region.

Why they made the list

If you operate multiple Ontario commercial locations, or your loss event is catastrophic enough to require surge crews from multiple branches, First Onsite has the scale almost no one else in Canada can match. They also handle full reconstruction services in-house, which compresses claim timelines because you avoid the handoff between mitigation and a separate general contractor.

3. ServiceMaster Restore: Best for coverage across smaller Ontario markets

ServiceMaster Restore operates one of the largest restoration networks in North America through a franchise model. In Ontario, that means local franchises in the GTA, Niagara region, Eastern Ontario, Southwestern Ontario, and most mid-sized markets. ServiceMaster Restore of Niagara, for example, serves Welland, St. Catharines, Niagara Falls, Fort Erie, Port Colborne, Thorold, Pelham, and the rest of the peninsula 24 hours a day, year-round.

Commercial restoration services offered

• Commercial water damage restoration and basement flood cleanup
• Commercial fire damage and smoke damage restoration
• Mould inspection, removal, and remediation
• Asbestos abatement
• Biohazard and trauma cleanup
• Odour control and air quality restoration
• Catastrophe response with network surge capacity

Why they made the list

The franchise model means you get a local crew that knows the area, backed by a network deep enough to handle multi-site losses or major catastrophic events. For property managers with locations spread across mid-sized Ontario cities, the geographic reach and consistent operating standards are hard to beat.

4. WINMAR: Best for insurance-driven projects with full reconstruction

WINMAR is a Canadian-owned national restoration network with IICRC-certified locations across Ontario. The brand has been operating for decades and is well-known to insurance adjusters, which matters more than people expect when you are trying to move a complex commercial claim forward.

Commercial restoration services offered

• Commercial water damage and flood damage restoration
• Fire and smoke damage restoration
• Mould inspection and removal
• Deep cleaning and biohazard remediation
• General contracting for renovation, reconstruction, and new construction

Why they made the list

WINMAR’s single-vendor model, where the same firm handles mitigation, restoration, and full reconstruction, eliminates the handoff problem that often stretches commercial insurance claims by weeks. For insurance-driven projects, the established adjuster relationships also help.

5. Independent IICRC-Certified Operators: Best for smaller commercial losses

Outside the franchise networks and national brands, Ontario is well served by independent restoration contractors who hold IICRC certification but operate without national branding. These firms can offer competitive pricing and more direct communication with the project lead, particularly on smaller commercial losses where a large national company may deprioritize the job.

The trade-off

You get more personal attention and often better pricing, but you lose the overnight surge capacity of a national network during a large or multi-property loss. For routine commercial water damage or smaller fire restoration projects under, say, $50,000 in damage, independents are often the smart choice.

What to verify before hiring an independent commercial restoration company

• Active IICRC certification for the specific service required (S500 water damage, S520 mould remediation, S700 fire and smoke)
• Commercial general liability insurance with limits adequate for your property value
• WSIB coverage for all crew members
• References from comparable commercial properties in your sector
• Willingness to provide structured insurance documentation, including moisture logs and a detailed scope of work

Ontario commercial restoration companies compared at a glance

Types of commercial restoration services in Ontario

Commercial restoration is not one service. It is a cluster of related disciplines, each with its own equipment, training requirements, and IICRC standards. Understanding what you actually need helps you pick the right Ontario commercial restoration company for the job.

Commercial water damage restoration

The most common type of commercial restoration work in Ontario. Sources include burst pipes, frozen pipe failures, sprinkler system activation, sewer backup, roof leaks, HVAC line failures, and overland flooding. The IICRC S500 standard governs the process, which involves rapid water extraction, structural drying using commercial-grade dehumidifiers and air movers, moisture monitoring, and final clearance documentation.

Critical timeline: Mould can begin developing within 24 to 48 hours of water intrusion in a commercial property. Response speed is not optional.

Commercial fire and smoke damage restoration

Fire damage cleanup involves more than just removing burned material. Smoke and soot travel through HVAC systems and contaminate areas the flames never reached, including ductwork, electronics, ceiling tiles, and porous building materials. Professional commercial fire damage restoration includes soot removal, thermal fogging for odour control, HEPA air scrubbing, structural cleaning, and water damage mitigation from fire suppression systems.

Commercial mould remediation

Governed by the IICRC S520 standard, commercial mould remediation requires containment of the affected area to prevent cross-contamination, HEPA filtration, removal of affected porous materials, antimicrobial treatment, and post-remediation verification testing. Ontario commercial properties most vulnerable to mould include those with chronic moisture issues, older HVAC systems, or recent water damage that was not properly remediated.

Biohazard and trauma scene cleanup

Specialized cleanup services for blood, bodily fluids, hazardous chemical spills, sewage backup, and other biohazardous contamination. Required for healthcare facilities, manufacturing plants, retail locations, and occasionally office buildings. Demands specific PPE protocols, regulated waste disposal procedures, and discretion.

Storm and wind damage repair

Includes emergency board-up services, roof tarping, debris removal, water intrusion mitigation, and structural securing. Ontario commercial properties face elevated storm damage risk during ice storms, tornadoes, hurricane remnants, and severe summer thunderstorms. The March 2025 ice storm that hit parts of Ontario and Quebec caused an estimated $342 million in insured damage.

Hazardous material abatement

Older Ontario commercial buildings often contain asbestos in insulation, floor tiles, and ceiling materials, plus lead paint and other regulated hazardous materials. Abatement requires licensed contractors following provincial regulations under Ontario Regulation 278/05 for asbestos work.

Why IICRC certification matters for commercial restoration

The Institute of Inspection, Cleaning and Restoration Certification (IICRC), headquartered in Vancouver, sets the international standard for the restoration industry. IICRC standards are ANSI-accredited and used in 30 countries, with more than 4,600 certified firms and over 43,000 certified technicians worldwide.

The standards that matter for commercial property owners

• ANSI/IICRC S500: The standard for professional water damage restoration in residential, commercial, and institutional buildings.
• ANSI/IICRC S520: The standard for professional mould remediation.
• ANSI/IICRC S700: The standard for professional fire and smoke damage restoration.
• Commercial Drying Specialist (CDS): Specialized certification for commercial, industrial, and institutional water damage work.

If a commercial restoration company in Ontario cannot tell you which IICRC certifications its technicians hold, you have your answer. Move on.

Your 60-second commercial restoration vetting checklist

The worst time to interview a restoration company is at 2 a.m. with water pouring through your drop ceiling. Before you sign anything, verify these seven things:

• IICRC certification for the specific service required (water damage S500, mould S520, fire and smoke S700, applied structural drying)
• Commercial general liability insurance with policy limits adequate for your property value, ideally $5 million or more for substantial commercial work
• WSIB coverage for every crew member on site, with a current clearance certificate available on request
• References from comparable commercial properties in your sector, with permission to call them
• Structured insurance documentation as part of standard workflow: moisture logs, photo records, written scope of work, daily progress reports
• Response time guarantee in writing, ideally 2 hours or less for commercial emergencies
• Clear scope on reconstruction: do they handle rebuild in-house, or do they hand you off to a separate general contractor?

Frequently asked questions about commercial restoration in Ontario

How fast should a commercial restoration company respond to an emergency?

The current Ontario commercial restoration industry standard is a 2-hour on-site response target. Anything slower significantly increases the risk of secondary damage, particularly mould following water events. Top commercial restoration companies in the GTA guarantee 2 hours or less in writing.

What is the difference between mitigation and restoration?

Mitigation is the emergency phase: water extraction, drying, board-up, smoke containment. Its purpose is to stop the damage from getting worse. Restoration is the recovery phase: cleaning, deodorization, content restoration, and returning the property to pre-loss condition. Reconstruction is the rebuild phase: drywall, flooring, paint, and structural repairs. Some commercial restoration companies handle all three. Others stop at mitigation and hand you off to a general contractor.

How much does commercial water damage restoration cost in Ontario?

Costs vary widely based on the affected square footage, water category (clean, grey, or black water), materials involved, and drying complexity. A small commercial water damage event affecting 500 square feet of an office space might range from $3,000 to $10,000 for mitigation alone. Major commercial flood events involving large facilities can easily exceed $100,000 in mitigation, plus reconstruction. Commercial insurance typically covers the majority, subject to deductibles and policy limits.

Will my commercial insurance cover restoration services?

Most commercial property insurance policies in Ontario cover sudden and accidental water damage, fire damage, and smoke damage. Coverage for overland flooding, sewer backup, and earthquake typically requires specific endorsements. Mould coverage is often capped or excluded entirely. The Insurance Bureau of Canada publishes plain-language guides on commercial coverage. Review your policy with your broker before a loss occurs, not after.

Can a commercial restoration company work directly with my insurance adjuster?

Yes. Most major Ontario commercial restoration companies, including Impact Restore, First Onsite, ServiceMaster Restore, and WINMAR, regularly coordinate directly with commercial insurance adjusters and provide insurer-grade documentation as part of their standard workflow. This reduces back-and-forth and speeds up claim resolution.

What should I do immediately after discovering commercial water damage?

Stop the source of water if safely possible. Shut off electrical power to affected areas. Document the damage with photos and video before moving anything. Call your commercial restoration company first, then your insurance broker. Do not attempt DIY drying with consumer fans, as commercial properties require commercial-grade extraction and dehumidification to prevent mould.

How long does commercial restoration take?

A typical commercial water damage job, mitigation only, runs 3 to 7 days for drying. Add fire and smoke damage and you may be looking at 2 to 6 weeks for full restoration. Major commercial losses requiring reconstruction can extend to several months. Speed depends heavily on response time, the complexity of the damage, insurance approval timelines, and material availability.

Which commercial restoration company is best for Ontario businesses?

For fast emergency response, IICRC-certified crews, and insurance-grade documentation, Impact Restore is the team most facility managers in Ontario call first. For multi-site portfolios that need a national network presence, First Onsite’s scale is hard to match.

The bottom line

The five categories above cover the realistic options for Ontario commercial property owners, from commercial-only GTA specialists to national networks with reach across the province to local IICRC-certified independents. The best commercial restoration company for your business depends on your property type, your geographic footprint, and the kind of partner you want answering the phone when something goes wrong.

Pick one now. Get a walk-through of your property. Exchange contacts with the project manager. Save their emergency line in your phone next to your insurance broker. When a pipe lets go on