The BK12 Two Seat Sofa requires a small amount of assembly. The elements that make up the BK12 consist of a backrest, seat, cross strut and two armrests. Assembly is a straightforward process, using an Allen key and nineteen screws (of three lengths) to fix the elements together. Constructing Carl Hansen's BK12 Patio Bench/Sofa will require two people as it weighs approximately 31kg (similar to a large dog).