Why remove top soil in building and construction?

Removing topsoil in building and construction is necessary to reach the solid subsoil layer that provides a stable foundation for structures. Topsoil is rich in organic matter and nutrients, making it unsuitable for load-bearing purposes. By removing the topsoil, engineers can ensure that the building's foundation is strong, stable, and less susceptible to settling or shifting over time. Additionally, removing topsoil allows for proper compaction of the subsoil, reducing the risk of structural damage in the future.