Fix a Leaky Shower or Bathtub Faucet: A Step-by-Step DIY Guide

Updated at: 03/02/2025

A leaky faucet, whether in your shower or bathtub, is more than just an annoying drip; it's a significant waste of water and can lead to costly repairs down the line. That persistent drip, drip, drip not only adds up on your water bill but can also contribute to water damage in your bathroom, potentially causing mold growth and structural issues. Ignoring a leaky faucet is a false economy; fixing it promptly is a simple, cost-effective solution that protects your home and your wallet. Furthermore, tackling this common plumbing issue yourself can be surprisingly easy and rewarding.

This satisfying DIY project is achievable even for those with limited plumbing experience. This guide provides a clear, comprehensive, and step-by-step approach to fixing your leaky shower or bathtub faucet, empowering you to tackle this common household problem with confidence. Let's get started with the first step in our journey to a drip-free, water-efficient bathroom!

Preparation and Safety Guidelines

Tools Needed
  • Phillips screwdriver
  • Needle nose pliers
  • Allen wrench
  • Channel locks
  • Waterproof grease
Safety Guidelines
  • Always turn off the water supply to the faucet before beginning any repairs. This is crucial to prevent flooding and injury.
  • Use appropriate safety glasses and gloves to protect yourself from sharp objects, hot water, and potentially harmful chemicals.
  • If you are unsure about any step of the repair process, consult a qualified plumber. Attempting a repair beyond your skill level can cause further damage or injury.

Step-by-Step Instructions

  1. Prepare for Repair

    • Turn off the water supply.
    Turn off the water supply.
    Prepare for Repair

  2. Remove the Handle Assembly

    • Remove the handle by unscrewing the screw underneath using an Allen wrench.
    • Remove the Phillips screw in the middle of the faucet.
    • Remove the white plastic piece that prevents the handle from turning. It's two pieces; remove both.
    • Pull out the metal sleeve.
    Pull out the metal sleeve.Pull out the metal sleeve.Pull out the metal sleeve.Pull out the metal sleeve.
    Remove the Handle Assembly

  3. Access the Cartridge

    • Remove the trim piece to access the retaining clip on the shower cartridge.
    Remove the trim piece to access the retaining clip on the shower cartridge.
    Access the Cartridge

  4. Remove the Old Cartridge

    • Remove the retaining clip using needle-nose pliers.
    • Pull out the old shower cartridge. Use channel locks if necessary, but be gentle to avoid damaging pipes.
    Pull out the old shower cartridge. Use channel locks if necessary, but be gentle to avoid damaging pipes.Pull out the old shower cartridge. Use channel locks if necessary, but be gentle to avoid damaging pipes.
    Remove the Old Cartridge

  5. Prepare the New Cartridge

    • Lubricate the rubber parts of the new cartridge with waterproof grease.
    Lubricate the rubber parts of the new cartridge with waterproof grease.
    Prepare the New Cartridge

  6. Install the New Cartridge

    • Insert the new cartridge, ensuring the 'H' (hot) and 'C' (cold) markings are correctly oriented.
    • Reinstall the retaining clip.
    Reinstall the retaining clip.Reinstall the retaining clip.
    Install the New Cartridge

  7. Reassemble the Faucet

    • Reinstall the trim plate, metal sleeve, and white plastic pieces.
    • Attach the handle and screw it into place.
    Attach the handle and screw it into place.Attach the handle and screw it into place.
    Reassemble the Faucet

  8. Test the Repair

    • Turn the water back on and check for leaks.
    Turn the water back on and check for leaks.
    Test the Repair

Read more: Fixing a Leaky Toilet Tank: A Step-by-Step Guide

Tips

  • Always turn off the water supply before starting.
  • Close the drain valve or use a towel to catch any dropped screws.
  • Use waterproof grease (silicone-based) on the rubber parts of the new cartridge for longevity and easier installation.
  • Don't use petroleum-based lubricants, as they can damage the rubber seals.
  • Be gentle when removing the cartridge to avoid damaging the pipes.

Common Mistakes to Avoid

1. Over-tightening parts

Reason: Applying excessive force can strip threads or crack components, leading to further leaks or breakage.
Solution: Tighten parts only until snug; use adjustable wrenches to avoid over-tightening.

2. Ignoring worn-out O-rings and washers

Reason: These small components are crucial for creating a watertight seal; neglecting their replacement leads to persistent leaks.
Solution: Replace all O-rings and washers with new ones specifically designed for your faucet type.

FAQs

What tools do I need to fix a leaky faucet?
You'll typically need a flathead screwdriver, a Phillips head screwdriver, adjustable pliers, channel-lock pliers (or similar), plumber's putty, Teflon tape, and possibly a basin wrench depending on your faucet's design. It's also a good idea to have a bucket or towels handy to catch any water.