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The use of modern computer technologies limits high practical and economic results in the construction of modern buildings and structures. This is due to the fact that modern software systems make it possible to predict with sufficient prospects the behavior of building structures under the influence of various factors, including under high-temperature conditions. In relation to the issue of heating steel building structures with fire protection and coatings intumescent under fire conditions, it should be noted that the process of heat and mass transfer in an intumescent coating is currently only partially studied. Objectives. The purpose of the study is the analysis of the application aspects of numerical modeling in the development of the project of fire protection steel constructions using modern software complexes and existing computational and analytical methods, and analyzing critical factors affecting the reliability of the results obtained. Methods. This study investigates the application aspects of numerical modeling in the development of a project for fire protection of steel building structures with intumescent coatings through analysis of existing experimental and theoretical research. Results and discussion. The results of the analysis of the existing experimental and theoretical studies in the field of the application of numerical modeling of heat transfer processes, including in the conditions of high-temperature exposure to fire, showed that the application of numerical modeling in the development of the project of fire protection steel building structures with intumescent coatings is associated with a complex and long process associated with validation Mathematical models of research objects are being developed. Conclusion. The current level of development of numerical modeling technology allows not only to supplement experimental studies, but also, if possible, to greatly reduce them.