Studies concerning the ergonomics applied to the workstations of Penitentiary Agents (AP's) have been neglected throughout history since a greater focus is historically given to prison spaces designed for the use of inmates. The built environment and the workforce of correctional officers are the main elements that make up the security and proper operation of a prison unit. The APs operate, monitor, and control the penal built space, so they are essential for the functioning of the prison unit, while the environment – when adapted to the needs of the user – favors the conservation of their physical and mental health. As a place of study, the Prison of Agreste with the administration of Co-management between the Secretary of State for Resocialization and Social Inclusion (SERIS) and the company Reviver Administração Prisional Privada Ltda. (Reviver) in the state of Alagoas. This study focused on penitentiary agents, as they maintain internal control within the prison unit. This research is qualitative and applied in a case study, based on the Ergonomic Methodology for the Built Environment (MEAC) developed by Villarouco (2008). This methodology considers the physical, organizational, and cognitive aspects, seeking to adapt the environment to the users' needs. That said, the data obtained in the field indicated that there are ergonomic risks related to the physical, organizational, and cognitive aspects of the analyzed workstations about the work of the penitentiary agents of the evaluated prison unit. The study concludes with the formulation of recommendations to propose improvements in these places, to eliminate or reduce the impact of these risks on the lives of the evaluated users.