These are materials that have already been used but can be reused I.e,Second-hand, used.These can be various boards, windows, doors, bricks, old slate (asbestos cement), etc. The new and used building material is used in order to save money, in repair and construction work.

For example like this secondary crushed stone, made from construction waste (brick, concrete, asphalt) or when dismantling concrete structures, concrete is reused, that is, it is used concrete from which crushed stone is obtained. Such crushed stone is used in the manufacture of various mortars, for the construction of various embankments, it can also be used in the construction of country roads, etc. There are used reinforced concrete floor slabs for sale, they can also be reused for their intended purpose.

Auxiliary (utility) buildings – A knowhow of how they are built

Auxiliary (utility) buildings are often erected from used bricks on the site, for example, in some places a street toilet in present and that house made of used red solid bricks. From it, you can build partitions in the house, garden paths are laid out with it, you can lay out the walls of the cesspool.

Used slate (asbestos-cement) is used for its intended purpose, if it is wave slate, they cover the roofs of various sheds, garages, flat used slate can be used in the construction of various fences.

Used windows and doors, after restoration, are also used for their intended purpose.

Used wood is used for the construction of outbuildings, although used lining can also be used for finishing premises (residential) or walls in a bathhouse. From used wood, if it is a tree of valuable species, even furniture is made exclusive.

Reuse of building materials , products and structures formed after the demolition of buildings and structures, an urgent task, the solution of which will improve the ecological situation. The objectives of the study are to determine the reasons for the renovation of urban areas; the most effective technologies for the demolition of buildings with the reuse of the resulting materials, products and structures.

 Materials and methods- systematization, structural, comparative analysis, theoretical generalization of data obtained from a detailed analysis of literary and statistical sources, field surveys of objects are used. During field surveys, photofixation methods were used. Results, the causes and main directions of renovation of urban areas are analyzed.

The advantages and disadvantages of various types of demolition are shown in terms of their environmental friendliness and economic efficiency. The existing technologies for the demolition of buildings, the disposal of construction waste and the reuse of building materials that are formed during the application of innovative technologies for element-by- element demolition have been identified and systematized.