Contractor Safety Management in Ontario: What Every Business Owner Must Know
5 min read
Hiring contractors is a normal part of business in construction, manufacturing, and many other Ontario industries. But a common misconception is that once you hand a job to a contractor, responsibility for their workers' safety transfers to them. Under the Ontario Occupational Health and Safety Act, that's not how it works. Project owners, constructors, and host employers all retain duties when contractors work on their premises or project sites. Failing to manage contractor safety properly exposes your business to Ministry of Labour orders, serious liability, and — most importantly — preventable injuries. Here is what every Ontario business owner needs to understand.
- 1
As a project owner or constructor in Ontario, you remain responsible for ensuring all contractors and sub-contractors comply with the OHSA — even if you didn't directly hire them
- 2
Pre-qualify your contractors before they set foot on site: request proof of WSIB coverage, valid insurance certificates, and their written health and safety program
- 3
All contractors and their workers must receive a site-specific safety orientation before beginning work — this is not optional and must be documented with sign-off
- 4
Assign a designated supervisor or safety contact to oversee contractor activities on your site — contractors cannot self-supervise without accountability to the host employer
- 5
Include safety expectations in your contracts: scope of work, hazard reporting procedures, incident notification requirements, and consequences for non-compliance
- 6
Conduct regular site inspections that include contractor work areas — don't limit your internal audits to your own employees only
- 7
When multiple contractors work together on a project, clearly define who is responsible for coordinating safety where their work overlaps — undefined zones create hazard gaps
- 8
All contractor incidents on your site must be investigated and reported under the same standards as incidents involving your own workers
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