A building element is provided which comprises a panel of non-metallic material having a pair of flat and parallel faces, namely a top face and a bottom face, and a plurality of lateral faces extending between the flat and parallel faces, at least one beam of metallic material, having a pair of opposed faces, namely a proximal face and a distal face, and a plurality of connection elements of metallic material that rigidly connect the at least one beam to the panel. Each beam is arranged along a respective lateral face of the panel with the proximal face in contact with the lateral face. Each connection element is a plate element comprising a first portion, which is inserted into a respective seat provided on a respective lateral face of the panel and is fixed therein by an adhesive, and a second portion which protrudes from said respective lateral face.