What are the site supervisor responsibilities? In the end, the site supervisor is always responsible for the health and safety of everyone working on a construction site. In addition to training pupils to work as Site Supervisors, the College of Contract Management's diploma program allows students to pursue the CIOB Level 4 Diploma in Site Management. Furthermore, the curriculum will cover the responsibilities of a Site Supervisor, important health and safety information for protecting coworkers, and essential communication skills.