This project aims to show the electrical installation of a building destined for apart-hotel. To do this, the methods used have been several, from the application of all the regulations related to this aspect, as well as the general regulations of electrical projects, from where I have been able to obtain references of models of other similar buildings and after apply it to this case. The power consumed by the whole building has been analyzed, in order to know how the installation should be and which size should have. Although there are points where the engineer decides how to install, the regulations have been followed up and not exceed the minimum so as not to increase unnecessary costs. Due to the fact that it is a large project, it must be understood that some aspects are not developed since it is a decision of the owner, but some installations have been left as a prevision for the possible installation of other elements in the future.