How to Replace a Bathtub Faucet

Learn the simple steps necessary to replace a bathtub faucet.

Middle faucet handle being turned in bathtub

The Spruce / Kevin Norris

Project Overview
  • Working Time: 30 mins - 2 hrs
  • Total Time: 1 - 3 hrs
  • Skill Level: Intermediate
  • Estimated Cost: $200

One of the more daunting tasks for inexperienced DIYers is attempting to figure out how to replace the handles and faucet in the bathtub. The key is learning how to remove the handles and faucet properly. Once you have accomplished this part of the task, reinstalling the new handles and faucet is relatively easy. You won't even need to change the process, regardless of whether you have a single-handle setup or a multi-handle setup. Just repeat the steps to remove the second handle without an issue.

Begin by turning off the water to the home and draining the plumbing lines. The basic process from this point consists of removing the existing handles, stems, and spout, then reinstalling a new spout, stems, and handles before testing the new setup. Follow these straightforward steps to learn how to replace a bathtub faucet.

Before You Begin

It's essential that you inspect the existing bathtub faucet and handles in order to find a replacement faucet set that will fit the current plumbing. Typically, this will also require measuring the pipe that the spout fits onto so that you can get a faucet spout that isn't too long or too short. If you are unsure about choosing new replacement parts, consider removing the old parts and taking them with you to a local hardware store so that you can compare the existing fixtures with the replacement fixtures. Alternatively, you can simply ask a store associate to help you find the correct parts. If you want all your fixtures to match, then it's a good idea to find a bathtub faucet kit that comes with handles, stems, and a replacement spout, instead of opting for individually sold products.

Tip

If your bathtub faucet requires replacement, consider replacing the showerbody all together: It can be challenging to find parts to specifically suit the prior installation, and if pieces don't come out easily, you may risk damaging the pipes in trying to remove them.

What You'll Need

Equipment / Tools

  • Cloth or towel
  • Flathead or Phillips screwdriver
  • Pass-through socket wrench
  • Hex key
  • Pipe wrench
  • Tape measure
  • Caulk gun

Materials

  • Bathtub faucet
  • Bathtub handles
  • Caulk
  • Plumbers tape
  • Plumbers grease

Instructions

Materials and tools to replace a bathtub faucet

The Spruce / Kevin Norris

  1. Turn off the Main Building Shut off Valve

    In order to perform almost any plumbing repair in the home, you will need to turn off the water to prevent leaks, flooding, and blow-offs while you work. Locate the main building shut-off valve, which is typically found in the basement or the mechanical room.

    Turn off the water and open the faucet on the laundry sink or a basement bathroom sink in order to drain most of the water out of the system. It's also recommended to turn on the sink faucet and bathtub faucet to drain any water that is trapped in these pipes.

    Water turned off by turning lever on main shutoff valve

    The Spruce / Kevin Norris

  2. Lay a Towel or Drop Cloth in the Bottom of the Tub

    When replacing the bathtub faucet, you will need to remove and handle one or more screws. By placing a towel or drop cloth in the bottom of the tub, you can prevent these small fittings from accidentally falling into the drain. It's also a good idea to have a safe location outside of the tub where the fittings can be kept until they are needed for reinstallation.

    White towel laid on bottom of bathtub

    The Spruce / Kevin Norris

  3. Remove the Handle Index from the Stem

    Start the process of replacing the faucet by using a flathead screwdriver to pry the index off of the handle stem. The index is the small plastic or metal circle that sits in the center of the handle to prevent access to the fastener. If you carefully pry up on each side of the index, you can remove it from each handle without chipping or cracking. However, if you put too much force into your attempt you can break the index, though this may not matter if your new faucet replacement kit comes with a new handle and index.

    If your bathtub faucet has more than one handle, then repeat the process to remove the index from the second handle. This should leave the fastener exposed so that the entire handle can be taken off.

    Index pried off handle stem with flathead screwdriver

    The Spruce / Kevin Norris

  4. Loosen the Handle Fastener to Remove the Handle

    Use a flathead or Phillips screwdriver to loosen the screw that was underneath the index. If it seems seized, don't keep trying to turn it with the screwdriver, as this will likely strip the screw. Instead, treat the screw with a lubricating solution, like WD40.

    Turn the screw counterclockwise until it can be completely removed, then set the screw aside in a safe place until it's needed for reinstallation. The handle should now slide off of the stem without much effort. If you have a second handle, repeat the process to remove the screw and handle.

    Phillips screwdriver loosening screw inside index to remove handle

    The Spruce / Kevin Norris

  5. Unscrew the Stem From the Faucet

    After removing the handle, you should see a thin pipe that extends out from the wall. This is known as the stem, and it's responsible for controlling the faucet. The stem can be removed with a pass-through socket wrench that can extend over the stem and grip the hex nut. With the socket wrench in place, turn the nut counterclockwise to loosen the stem. Once the stem is loosened, simply grab it with your hand and pull it out of the wall. Repeat the process for each handle in the bathtub faucet setup, and put the old parts aside so that they can be used as a reference to purchase compatible replacement parts.

    Pass-through socket wrench loosening stem from faucet handle

    The Spruce / Kevin Norris

  6. Remove the Spout

    The spout on a bathtub faucet is either secured with a mounting screw that is usually located on the underside of the spout, or it is simply screwed onto the pipe. Check for a mounting screw and if there is one, then use a hex key or screwdriver to remove the screw and put it aside in a safe location for reinstallation. By pulling on the spout, it should slide right off the pipe without a problem.

    If the spout does not have a mounting screw, then you will need to wrap a cloth or towel around the spout to protect the metal before gripping it with a pipe wrench and turning the entire spout counterclockwise to remove it from the pipe. Once the spout is loosened, it should slide off, revealing the water pipe that was inside the spout.

    Bathtub spout twisted and removed from water pipe

    The Spruce / Kevin Norris

  7. Measure the Pipe and Purchase Replacement Parts

    To ensure that you get compatible parts for your current plumbing set, use a tape measure to measure the length of the pipe. You will need to get a replacement spout that is longer than the pipe. Use the old handles, stems, and spout as a reference when you head to your local hardware store to pick up replacement parts.

    Remember, if the shower has a multi-handle setup, you can't switch to a single-handle setup without a significant amount of replumbing, so it's best to invest in a similar set of handles, rather than picking up a replacement handle that won't work with the existing plumbing.

    Bathtub faucet pipe measured with measure tape

    The Spruce / Kevin Norris

  8. Screw in a New Stem

    With all of the new parts ready to go, you can begin to reinstall the new bathtub faucet. Start by feeding the threaded end of the stem into the hole where the old stems were previously installed. Turn the stem clockwise, tightening it by hand at first, then use a socket wrench to ensure that the connection is snug and secure. Just make sure that you don't overtighten the stem because this can cause damage to the pipes. If your bathtub has multiple handles, repeat the process with each handle to install the new stems.

    New faucet stem installed to water pipe

    The Spruce / Kevin Norris

  9. Install the New Handles

    The handle is easy enough to reinstall. Simply slide it over the new stem until the handle touches the wall. Once in place, use a flathead or Phillips screwdriver to secure the handle with the old screw that you removed or with a new screw if one came with your bathtub faucet replacement kit. The index cover should pop into place with a little push in order to protect the screw and finalize the look of the handle.

    If you have more than one handle in the bathtub, repeat the process with each handle. You may also want to use a caulk gun to caulk around the base of each handle for the purpose of preventing water from entering the walls.

    New faucet handles screwed on to stem

    The Spruce / Kevin Norris

  10. Install the New Spout

    Before installing the spout, use plumbers tape on the pipe's threading to help create a secure seal and prevent leaks. If the pipe doesn't have threads, then it may be beneficial to use plumbers grease on the pipe to help lubricate and protect the fitting.

    Slide the new spout over the pipe and secure the spout to the pipe with the mounting screw. If your spout doesn't have a mounting screw, then simply turn it clockwise to screw the entire spout onto the pipe. Wrap the spout in a cloth or towel to prevent accidentally scratching the new fixture, then finish tightening the spout with a pipe wrench. Just make sure that the spout is snug against the wall and that it is facing down.

    Use a caulk gun and caulk to seal the base of the spout in order to prevent water from entering the walls and causing water damage and mold growth.

    New bathtub faucet screwed on to water pipe

    The Spruce / Kevin Norris

  11. Turn on the Water and Test

    Turn on the water to the home and allow it to flow throughout the plumbing system. The water will initially push any air out of the pipes, so give it a few minutes before turning off the laundry sink or basement bathroom sink, then proceed to the bathtub.

    Check the bathtub faucet and handles for any leaks, then turn off the bathtub faucet and check again with the fixture under pressure. If all went as planned, you should have a new bathtub faucet and no leaks.

    Main shutoff valve lever turned to switch on water

    The Spruce / Kevin Norris