Abstract: A sofa or similar seating with backrests, armrests or additional fixtures that can be positioned as desired relative to the seating, while providing a platform-like basic structure that accommodates the upholstery so as to form the seat surface, with which backrests and/or armrests and/or additional fixtures are connected through a U-shaped element that is preferably of metal tubing, the free ends of this element being connected with the backrests, armrests or additional fixtures and the U-shaped element is of a curved shape as viewed from the side, this forming contact points for the element on the floor, with the end of the element that is bent upwards resting on the underside of the base plate of the sofa so as to form a backing therefor.