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The article gives the characteristics of the ferrous metallurgy enterprises with a very high density of placement. As part of such enterprises, there is a large number of multipurpose buildings and structures with complicated space-planning and design solutions and the same time these areas are saturated by underground and transport communications. During the reconstruction of these facilities, the large volumes of works are provided including earthworks, making massive foundations under equipment, reinforcement of reinforced concrete and metal constructions, dismantling and assembling of technological and electrical equipment, special construction works. Performing of reconstructive works requires coordination of their solutions with service departments of the enterprises. In particular, for major industries there were highlighted features that must be considered when drafting and coordinating solutions. The biggest difficulty is mounting of various technological and electrical equipment, devices and means of automation (ranged from heavy equipment to the finest contemporary domain of electronic systems of management of production processes). When this enlarger assembly of heavy equipment is carried out in extremely camped in size sights in the vicinity of the existing slag removers for casting iron, the installation and commissioning of automation tools are manufactured with running technological equipment with its short-term halt or without any. Solution of these problems requires careful shaping options for the organization of construction and installation works on the basis of focused iterating through possible reconstruction methods, priority reconstruction of technological processing shops, the sequence of execution of works, taking into account the technologically possible combination of them. The authors propose the formula for the calculation of the overall duration of the reconstruction project including the duration of the preparatory and main periods, taking into account before stopping period, stopping and after stopping periods. The article highlights the features of realization of solutions for the main period of reconstruction of the enterprises and make suggestions on implementation of works and replacement of equipment for agglomeration shops, coke oven batteries, steelmaking shops, rolling shops and blast furnaces. The article also focuses on the ways of safety production work during the reconstruction of the ferrous metallurgy enterprises.