The layout of the premises of the house should also be determined at the stage of laying the foundation, otherwise the redevelopment will require quite serious investments or it will be impossible at all. First of all, it should be taken into account hygienic norms that require that there are 25 cubic meters of air per person. In other words, at the height of the ceiling 3 meters, the area per person should be 9 square meters. Further, when planning, it is necessary to take into account several factors. For example, the number of future residents.