The foundation soil is influenced by many factors that have an impact on the realization of building structures. A large group consists of exogenous factors. Exogenous factors are acting on the earth surface at any moment. The dynamic and strength effects of each individual exogenous factor differs in each location. Understanding the basic exogenous factors and their effects on building construction is essential in the realization of any construction. Exogenous processes determine the process of weathering, which are applied as erosion and abrasion. In addition, landslides, whose destructive power is determined by the speed of movement and real extension. Furthermore, the process of karstification causes the creation of cavities. They also included the collapsibility of soils who, like the previous factors, have a negative impact on construction. They occur mostly in mutual interaction, although individual exogenous processes are presented separately. The publication presents problems of exogenous factors, their effects on building construction and changes in physico-mechanical parameters. Good knowledge of the fundamental problems occurring in connection with exogenous factors allows us to ensure measure and expect a number of complications early.