A partition wall includes two columns, which are elongated with respect to respective column axes. The columns are arranged to be spaced apart from one another in parallel. A plurality of bases is provided. A portion of the columns is associated with a respective single base, which is fastened at a lower end of the relevant column. All bases can be fastened to a common subsurface. A laminar separating element is fastened between two adjacent columns. The columns each include two separate half-columns which are elongated with respect to the associated column axis, and abut one another transversely to the respective column axis. The half-columns are directly fastened to the associated base. An associated laminar separating element is directly fastened to at least one half-column of a two-piece column. A corresponding base and a method for assembling the partition wall are disclosed.