Install a Prefab ShowerThe biggest problem with a single piece shower unit is that it probably won't fit through the doorway. So whether you are installing a new shower to add value as part of a remodel or replacing an old shower, you will most likely use a kit. These shower kits come in a variety of styles, colors and designs. They come in as few as two pieces or as many as seven depending on your requirements and budget.A shower base can be purchased that has the drain opening in the center or one of the sides depending upon your Plumbing location. You may have to install a cement shower base before you can install the shower drain pan. Once the shower pan has been installed, it's time to assemble the walls. Holes have to be cut into one panel for the faucet and showerhead. Measure the distance from the floor and the corner to the plumbing fixture. Transfer this data to the panel and cut the appropriate size hole. Attach the panels to the wall with adhesive. Draw a bead down each edge and make a big "X" in the middle of the panel. Press it firmly against the wall. Do this for each panel. Seal every joint with silicone caulk. Attach the metal runners for your glass panels and door. Install the glass side panels and seal the around the panel edges. Install the door. Connect your plumbing fixtures.