A multi-piece shower enclosure includes a base section, a plurality of vertically extending sidewalls and a flange extending horizontally outward along a top portion of sidewalls. A back wall section is removably attachable to the base section, the back wall section having a ledge provided on the bottom portion of the back wall section. One or more side wall panels are removably attachable to the back wall section. A plurality of pins is used for securing the back wall section to the base section and the side wall panels to the back wall section. Each of the pins has a lower rivet portion and an upper threaded portion separated by a central portion. Each of the pins is insertable into a corresponding opening provided on the ledge of the back wall section or a side of the back wall portion adjoining each of the side wall panels.