The reconstruction of large-block buildings of mass development is a strategic direction in solving urban planning problems of dilapidated housing, which will improve the comfort of living of residents of buildings and their energy efficiency, improve the architectural and aesthetic appearance, extend the life cycle of buildings, as well as increase the area for people to live. Reconstruction can be carried out by the addition of attic floors, which will increase the total living area of the house with a different layout and configuration of the premises. The reconstruction method using the combined load-bearing frame of the attic floor from rolled steel structures and lightweight thin-walled structures, according to technical and economic calculations, is the most effective and appropriate, as it allows due to the typical development of these objects, as well as the existing reserve of the bearing capacity of structures and building elements , including the bases and foundations, to implement this technology for the reconstruction of buildings, while significantly reducing investment, labor completed work and construction deadlines.