DIY Bathroom Sink Faucet Replacement

diy faucet replacement imageWhether your sink’s faucet is malfunctioning or it just looks outdated, replacing it can be a quick way to upgrade the overall look and function of your bathroom. This easy process can be done in about an hour and it doesn’t require any specialized plumbing knowledge or equipment. As with any DIY plumbing project, if you run into questions or issues that you don’t feel comfortable handling on your own, give us a call and we’ll happily come out and help finish the job.


  1. Measure the spread between your current faucet’s handles. Typically, bathroom faucets come in either a 4” or an 8” spread. When shopping, you’ll want to make sure to choose a faucet with the same spread.
  2. Once you’re ready to install your new faucet, reach underneath the sink and carefully turn off the shut-off valves using two hands. Turn the faucet on to verify the shut-off valve is in the off position. If water still comes out, the shut-off valve may be broken, and you will need to hire a professional plumber to replace it before continuing.
  3. Use a wrench to carefully disconnect the shut-off valve from the supply line coming from the wall. Use a small bucket to catch the water remaining in the supply line.
  4. Disconnect the supply line from the faucet.
  5. Disconnect the old faucet from the sink top. Some faucets will have a nut on each side, and some will have a bracket in the middle.
  6. Remove the connection to the pop-up drain.
  7. Clear any debris from around the sink top and make sure the area is clean.
  8. Line up the new faucet with the corresponding holes in the sink, and secure the faucet with the brackets and/or hardware that were included with it, making sure not to over-tighten the bolts or nuts. It can be helpful to have a second person present to hold the faucet in place. This will ensure it’s straight.
  9. If your new faucet has supply lines on it, you can skip this step. If it does not, you will need to attach new supply lines. We recommend using a basin wrench due to the tight space.
  10. Connect the supply lines to the shut-off valves underneath the sink.
  11. Place a bucket under the P-trap, then loosen the nut on the lowest side just enough to allow the water to drain from the trap. Once drained, loosen both nuts all the way, remove the trap, and pour out any remaining water.
  12. Remove the pop-up drain by loosening the nut on the bottom, then pushing up and loosening the stopper inside the sink. In some cases, your pop-up drain may disconnect from the bottom, in which case you can pull it up through the top.
  13. Clear any debris from the drain area to prepare to install the new pop-up drain.
  14. Place a ring of plumber’s putty around the area where the drain assembly meets the sink. Use Teflon Tape and thread sealant on any threads.
  15. Depending on the manufacturer’s instructions, tighten the assembly included with your pop-up drain and install the new P-trap. Remember not to over-tighten. Connect the pop-drain.
  16. Slowly turn the water back on and check for leaks. If there are no obvious leaks, proceed to fill the sink several times with hot water and drain completely to ensure there are no drainage leaks.