Labour-only contractors are additional employees who can be brought onto the site if you are short staffed or need extra temporary workers to finish a job. They are not guaranteed work and aren’t employed on a project basis. They are still subject to the same health and safety regulations as a sub-contractor. Labour-only workers will use a contractors’ tools and materials and will work under the supervision of a contractor. Sub-contractors will work on a project and will work independently; they will also invoice for payment.