As a self-employed tradesperson, your safety duties shift depending on what hat you are wearing. On your own job you may be the constructor (in some provinces the prime contractor) carrying overall responsibility for the whole site; on a larger project you are an employer and a supervisor for your own crew; and you are always a worker yourself. The law stacks these duties, it does not let you pick one. Get them straight, because a charge can name you in any of these roles, and the way you stay out of trouble is the same in every province: due diligence.
Constructor and prime contractor: who runs the site
On a construction project, one party carries top-level responsibility for health and safety across the whole site. In Ontario that party is the constructor; in BC, Alberta and several others it is the prime contractor. This is usually the general contractor, but on a small job it can be the homeowner's chosen lead trade, or you, if you are the only contractor on site. The constructor or prime contractor must coordinate the safety of every employer and worker on the project, make sure the Act and regulations are followed, and on larger or longer projects file a notice of project with the regulator before work starts. If you take a job as the sole or lead contractor, assume you are carrying this duty unless someone else is clearly designated in writing.
Employer duties
The moment you have a worker, you are an employer, and the core employer duties are consistent across provinces even where the section numbers differ:
- Take every reasonable precaution in the circumstances for the protection of workers. This is the "general duty" clause and it is broad on purpose.
- Provide equipment, materials and protective devices, and keep them in good condition.
- Instruct, inform and supervise workers so they can work safely.
- Appoint competent persons as supervisors.
- Prepare and review a written health and safety policy, and establish a Joint Health and Safety Committee or representative once you reach the worker threshold.
Supervisor duties
A supervisor, which on a small crew is usually you, must:
- Ensure workers comply with the Act and regulations.
- Ensure required protective devices and clothing are actually worn.
- Advise workers of any potential or actual danger.
- Take every precaution reasonable in the circumstances to protect them.
The "competent person" is a legal term
Every provincial Act defines a competent person, and the substance is the same. A competent person is qualified by knowledge, training and experience to organise the work, is familiar with the Act and regulations, and is aware of any actual or potential danger on site. The point that catches contractors out: it is not simply your most experienced hand. If you appoint someone as supervisor who does not actually know the regulations, that appointment is itself a violation, separate from whether anyone gets hurt. You must be able to show the training and knowledge, not just the years on the tools.
Quebec is different
In Quebec the framework runs through the CNESST and the Safety Code for the construction industry, and construction supervision and certification sit inside the R-20 regime. ASP Construction safety training is mandatory for construction workers. The duties resemble the rest of Canada, but the certificates, the cards and the language are Quebec-specific, so do not assume an Ontario or Alberta program satisfies a Quebec site.
The due-diligence defence
Due diligence is the single most important concept for a contractor to understand, because it is your defence if something goes wrong. To rely on it, you must show that you took every reasonable precaution to prevent the harm before it happened, not after. In practice that means: written safe-work procedures, documented training, recorded toolbox talks, inspections with dated records, the right equipment supplied and maintained, and proof you enforced the rules (including disciplining workers who broke them). The defence is built in advance, in your paperwork and your habits, not improvised at the inquiry.
Two hard limits to know. First, due diligence is a defence to provincial OHS charges, but it is not a defence to a Criminal Code charge of criminal negligence under the Westray law (see Incident Reporting and Penalties). Second, a Certificate of Recognition (COR) or strong safety program is good evidence of due diligence but is not conclusive on its own.
Common mistakes
- Not knowing you are the constructor. On a job where you are the only contractor, you likely carry the top-level site duty, ready or not.
- Appointing a "supervisor" who does not know the regs. Competence is a legal test; the appointment fails without it.
- Treating safety paperwork as box-ticking. Those dated records are precisely what builds the due-diligence defence.
- Assuming due diligence covers a criminal charge. It does not reach criminal negligence.
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