A housing construction kit that includes at least one plug device and/or one fuse. The kit contains a housing base body with numerous installation openings and numerous installation plates. A first coding means is formed on each opening and a second coding means is formed on each plate. Every first coding means of an opening has a unique first coding and every second coding means of a plate has a unique second coding. Every second coding means of a plate is designed to be complementary to at most one first coding means of an opening and every second coding means of a plate is designed to be complementary to a first coding means of another opening as every second coding means of a plate, which is designed to be suitable for assembly of at least one plug device.