Multi-employer Worksites When more than one employer operates at a single site, OSHA considers it a multi-employer worksite. A construction site is an example of a multi-employer worksite with multiple contractors assigned the work, but not all at the same time. Employers at multi-employer worksites need to know their responsibilities, assigned roles, and accountability for employee health and safety. Note that a multi-employer worksite differs from a dual-employer worksite, where an employee has two employers at the same time. For example, a temporary agency employee that is assigned to another employer’s worksite. On multi-employer worksites, all of the employers must work together...