The invention relates to a laminated composite structural element with facing and resin-based subjacent support. It is characterised by the combination, from the facing to the backing : a) a facing 1 composed of matching assembled elements; b) a joint 2 for connecting and sealing the facing elements 1; c) a first reinforced-resin layer 3; d) a cellular rigid layer 4; e) a second reinforced-resin layer 5, and, on the edges, a means 6, 7 for aligning two continuous elements. Application to furniture (movable property) and to real estate (immovable property).