Restoration is of particular importance. Restoration is a branch of architectural art that begins to revive the spaces based on the complete knowledge of the building. Many buildings are damaged by atmospheric factors, chemical attack, embedded metals, alkaline reaction, fire, overload, seismic forces, etc. and are destroyed after many years. Old buildings include ancient temples, historical buildings, heritage buildings and some residential, commercial and administrative buildings that need repairs. For this reason, the strength, durability and stability of those buildings must be regained. Therefore, the need to retrofit buildings is essential.

Structural rehabilitation includes updating or changing the foundation of the building and structure and changes in its use in accordance with the rules of building engineering and urban planning. In any case, it is clear that instead of demolishing and building a new building in the allocated space, it is cheaper to renovate the structure and improve the building.