Disconnect the trap from the tub, remove any clips, fasteners or screws that hold the tub to the wall, and demolish the old cast iron tub with a sledgehammer. Remove the sink and toilet. Turn off the electricity at the main panel and remove light fixtures. Cap the wires with wire connectors. Then rip out the wall finishes and surfaces clean down to the studs and pull out any insulation. If your ceiling is in good shape, use a utility knife to cut the drywall along the edges so the wall materials will separate cleanly from the ceiling.

You’ll spend $3,000 to $8,000 on the typical remodel. Anywhere from 40 to 65 percent of a bath upgrade cost comes from labor. However, doing any project yourself means no insurance and added fees if something goes wrong. Hire a professional for any work you’re not comfortable doing, such as the plumbing and electrical. Consider the pros and cons of DIY vs professional bathroom remodeling.
An upscale bathroom remodel may include structural changes like expanding or adjusting the layout. Finishes include things like large ceramic floor tile, heated floors, high-end faucets, new lighting, and stone countertops with double sinks. Showers may have frameless glass doors, rain shower fixtures, shower niches and tiled shower walls. Freestanding tubs are also found in this type of bathroom remodel.
Turn off the main water supply to the house, and in a convenient location, cut the hot and cold water supply pipes for the bathroom. Also cut out and remove all the existing water lines and fittings in the bathroom. Finally, cut out and remove the vent section leading to the sink and the main stack 5 in. below the vent tee. Stuff rags into open drain lines to keep sewer gas out of the house. 
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