Building Sofa is a further development of Sami Kallio's acoustic armchair of the same name. The sofa is buildable with parts locked with a top screw. Building is fully upholstered and reduces noise both in the room and for the person sitting on the sofa. The unique construction with buildable elements with a molded frame means that the Building has a softly rounded back. The sofa is available as 2 and 3 seater.