Reconstruction of buildings is a complex of organizational and construction works, construction installation works, including a rather wide range of possible measures – modernization, demolition, outbuilding and additional structures of the several floors. The reconstruction is performed, if some improvements in living are necessary, as well as increase of efficiency of functioning, increasing of the volume of a building and for other purposes. It is also required when the loads on building are increasing temporary or permanently, underground facilities and buried structures are developing, as well as in the event of deterioration of structure or changes in the state of ground.

During the reconstruction it is possible to make changes in the functionality of the building, in quantity and quality of the indoor premises, to increase the total area of ​​the building and to develop the underground space.