The paper considers the peculiarities of construction of special structures based on individual projects and requiring non-standard approaches to design and calculation due to unique loads and impacts on the structure. The author emphasizes the importance of transferring design to the field of virtual building information model (BIM) to ensure a high level of detail, accurate calculation of materials and works, as well as the possibility of making changes to the BIM model for further monitoring of the life cycle of the structure. It is noted that the use of BIM programs allows to effectively take into account all components of the structure and minimizes technical errors in the coordination of engineering networks with structural drawings. The purpose of this paper is to analyze the results of building design using computer-aided design (CAD) and building information modeling (BIM) systems. The work is aimed at studying the efficiency and accuracy of the design performed using CAD technologies and comparing it with the results obtained through the use of BIM modeling. Changes that occur to the building and are not foreseen in the original design can be incorporated into the model, which ensures that the information is upto-date and relevant throughout the entire life cycle of the building.