Despite safety regulations, the execution of construction projects has irreparable risks, including physical accidents and financial crashes for human resources and the project. These events adversely affect the balance of cost, time, and quality of projects. Therefore, a safety management system can play an effective role in improving the project management process. This research aims to identify and evaluate the most important levels and safety criteria in construction projects, evaluate and develop a safety management maturity model in workshops based on a case study, statistical analysis of the data obtained from the questionnaire, and the combined multi-criteria decision-making method. It is based on combining Analytical Hierarchy Process, Technique for Order Preference by Similarity to Ideal Solution, and Decision-Making Trial and Evaluation Laboratory methods. Based on the study results, twelve important safety criteria were identified and ranked according to the performed weighting. Then among the three study projects, one was selected as the project closest to the ideal solution. In the end, the most effective criteria were identified according to prioritization in the four main pillars of the project. Components of using the integrated system of project safety documentation and records by different stakeholders with scores of 15.39 and 17.9579, using optimal methodologies and processes based on UpToDate procedures with a score of 11.1443, and determining goals, procedures, strategies, and project safety requirements and communicating its documents with stakeholders with a score of 6.6906 were recognized as the most important components in the pillars of leadership and management of the project organization, key personnel and project staff, project partners and stakeholders, and policies and strategies, respectively.