Abstract Currently there is no approach which would help to comprehensively ensure occupational safety. Many scientists perform researches and calculations, create new methods related to safety and health, but most of them analyze separate aspects of safety in the field of construction. The authors of this paper present a new complex view on ensuring occupational safety and health during construction. The selection of safety solutions is performed based on complex evaluation of structure, technology and safety. In their previous works, the authors offered a new method for multiple attribute decision synthesis, SyMAD-3, which helps to choose an effective construction project alternative from multiple alternatives by assessing various construction, technological and occupational safety solutions, based on a set of quantitative attributes. However, the integration of these solutions may cause doubts, since decision making in construction is always associated with uncertainty. The investment projects in construction are characterized by the large accuracy variation (from 15 to 50%) of some attribute values. Although the SyMAD-3 method is mathematically grounded, it does not answer the question if the error of attribute values impacts the final decision and if this decision can be reliably assessed. In the present paper, the authors supplement the SyMAD-3 method with decision sensitivity analysis (SyMAD-3 with SA) to improve the reliability of the SyMAD-3 method and assess the reliability of the obtained decision. The SyMAD-3 with SA method allows us to choose an effective alternative of a construction project by assessing three stages of construction, based on a set of attributes given the error of their values, and determine the reliability of the final decision. The proposed method is implemented in a software package created by the authors with the aim of analyzing decisions and performing experimental calculations in the field of construction.