Abstract: A method of forming a pre-fabricated, integrally molded shower pan unit in which tile is installed at a manufacturing facility before shipment to the location where the shower is to be built. A backing sheet of fiberglass is bonded to the back of a sheet of granite or marble which is turned over and the face of the sheet of stone is scored or cut to form a panel with rows and columns of tiles secured together by the backing. A drain opening is formed in the panel, the panel is secured by adhesive to the floor of the shower pan, a drain pipe is installed and grooves in the panel are grouted.