The implementation of an Occupational Safety and Health Management System (SMK3) is a crucial aspect in creating a safe, orderly, and productive working environment within the construction sector, which is known for its high level of risk. This study was conducted on the KAI Hotel Boutique construction project with the aim of evaluating the extent to which the K3 system has been implemented in accordance with applicable standards. The research employed a descriptive quantitative approach, distributing questionnaires to workers and project management staff, complemented by an analysis of internal audit results. The assessment focused on five key elements: K3 policy, planning, implementation and operation, evaluation, and management review. The data analysis revealed that the level of success in implementing SMK3 reached 86.27%, which falls into the high achievement category according to regulatory provisions. This indicates that the K3 system has been effectively implemented, although several aspects still require improvement, such as suboptimal emergency response training, limited certified first aid (P3K) and fire extinguisher (APAR) personnel, and incomplete risk documentation. Moreover, the dissemination of emergency response structures and the conduct of toolbox meetings need to be strengthened to ensure that all workers share a common understanding of safety procedures. With this achievement, the contribution of this research to the construction industry is to provide empirical evidence that consistent SMK3 implementation can enhance workplace safety, reduce accident potential, reinforce compliance with safety standards, and support project productivity and sustainability. The findings also emphasize that strengthening aspects of training, documentation, and internal communication will be key to establishing a sustainable safety culture within the construction industry.