Sources of ground movements, like tunneling, shrink-swell phenomenon of clay soils, mining subsidence, etc., may create a significant soil settlement. This can have an important impact on nearby buildings due to the deformation caused by the variation of the soil level. To simplify, design engineers may consider that the building totally follows the ground movement displacement. However, the building stiffness has an important role that has to be considered leading to reduce the deformation transmitted to the building. Considering its stiffness, the building response to the sources of ground movements may differ according the soil-structure interaction factors. Furthermore, the building deformation may be affected by various uncertain factors such as those related to the soil (mechanical properties, geology, etc.) and uncertainties related to the building (homogeneity of properties, variability of stiffness caused by the presence of openings, etc.). Buildings constructed on shallow foundations can be assimilated to elastic beams and thus, the beams response can be considered representative of the building response. The estimation of the beam equivalent stiffness is then an important challenge. It depends upon the uncertainties related to the building geometry, structural properties and presence of openings and windows. To investigate the effect of these uncertainties, three approaches can be used: numerical, analytical and experimental. The current project is based on a numerical approach developed on Plaxis where a beam model is used to study different shapes and typologies of buildings. After studying different types of buildings, diagrams will be presented to simplify the determination of the equivalent stiffness.