After removing your shower head and handle, cover your shower floor with newspaper. Take your hammer and chisel and start from the bottom corner. Gently place the chisel on the side of tile and use your hammer to push the tile out. Start gently. As you move on, you may have to use some real elbow grease to get these tiles out. Once all tile has been removed, chisel off any remaining mortar as well.
Tear out the existing piping (Photos 5 and 6). Then frame the 2×6 walls that will contain the new plumbing and the opposite end of the shower base (Photos 8, 9 and 14). It’s easiest to nail the bottom plate to the floor and the top plate to the ceiling, then fill in the studs one at a time by toenailing them in at the top and bottom. Stack the studs directly in front of the old ones wherever possible. Space the studs in the center of the shower about 12 in. apart to leave room for the shower valve and showerhead. The studs behind the toilet should be spaced exactly 19-3/4 in. apart for securing this toilet chair carrier (Photos 8 and 15).

If your room is wider than the shower base, fur in the walls as needed to butt against the ends of the shower base (see Photo 14). Our bathroom is 6 ft. wide, so we added a floor-to-ceiling 2×6 wall at the showerhead end and a shorter 2×6 wall at the opposite end. We made that wall only 43 in. above the floor so we could use the top of the wall to hold shampoo and other shower supplies. The shower base usually comes with a special 2-in. drain fitting that you connect to the drain line (Fig. B).

Tile the walls first, then the floor. When tiling around the window, keep the tile about 1/8 in. away from the glass block. Tile the floor, starting by carefully snapping center lines to lay out border strips and field tile. Work from those lines to get evenly spaced tiles throughout the floor. Grout the walls and floors but caulk the inside corners between floors and walls and where walls meet.
Unlike clunky over-the-showerhead organizers, a recessed cubby in a tub or shower surround gives shampoo and soap a permanent home and doesn't take up stall space. Size it to minimize tile cuts, and line the bottom with a leftover piece of stone or solid-surface countertop, not tile, so that you won't have to scrape away scum from grout lines. If you have kids, add an extra cubby around knee height so that they can suds up on their own.
Interior bathroom demolition costs $1,000 to $2,300. Prices can go higher if you’re removing and moving walls to create a different footprint. For the experienced DIYer, this is a good place to save money by doing it yourself or assisting the contractor. However, demo can get expensive quickly if you take out a load bearing wall, cut electrical lines or break a water pipe. Avoid the risk by hiring a pro.