Currently, more and more investments are carried out in areas with difficult ground conditions, where in addition there may be a high level of groundwater. Therefore, it is necessary to use technologies which ensure the safety of the building in the exploitation phase by, among others, ensuring appropriate leak-tightness of its underground part. The article focuses on presenting the application of watertight concrete system (WCS), also known as "white tub" technology, which is an effective way to protect the underground part of the building against the destructive effects of water. The aim of this paper is to present and analyze selected methods of securing the underground parts of erected buildings using the "white tub" technology. In this paper, the authors analyze and select the solution using a multi-criteria analysis. The presented method will be used on a selected object.