The EBSKA House is characterized by his modular structure, pre fabrication and efficiency energy. It is a rigorous and simultaneously flexible building in his composition due to the work of reflection invested on prefabricated modules that can be formed and incorporated by users request.The building remains formed by a modular composition where every user can choose the number of modules of the housing or office, depending on the necessary spaces and the use that the client wants to give (familiar, second housing, work, etc.).The project is based on a set of modules that allow to mount and to dismantle easily the house in such a way that choosing different modules, by request of the user, different models of housings might be formed, taking advantage of every space, combining day and night spaces with work spaces. The first variable that determines the configuration of the housing is the number of users.