How to Replace a Bathroom Faucet: A Step-by-Step Installation Guide
Most bathroom faucet replacements are simple once you can reach the hardware under the sink. The parts that usually slow people down are old mounting nuts and shut-off valves that no longer close all the way. Check both before you start.
If the new faucet matches your sink, the basic job is the same: shut off the water, take out the old faucet, secure the new one, reconnect the supply lines, and look for leaks. Keep the installation sheet nearby. The mounting hardware and sealing instructions can differ from one faucet to the next.
Table of Contents
Check the fit before you start
Look at the sink before opening the new faucet. Count the mounting holes. If there are three, measure from the center of the left hole to the center of the right hole. That tells you whether you have a centerset or widespread layout.
If your sink already has a single mounting hole and the new faucet is designed for that setup, installation is often more straightforward because there are fewer mounting parts. Still, follow the installation instructions that come with your faucet and check that there is enough clearance under the vanity.
A single-hole faucet, centerset faucet, and widespread faucet do not mount the same way. Our Bathroom Faucet Hole Guide can help you identify the setup. If you are replacing a three-hole faucet, use our guide to centerset and widespread bathroom faucet replacement for the mounting details.
What to have on hand
- Adjustable wrench
- Basin wrench for mounting nuts in tight spots
- Small bucket and a few towels
- Flashlight or headlamp
- Cleaning cloth and a non-abrasive cleaner
- Plumber's putty or sealant, but only if the faucet instructions call for it
- Safety glasses if the underside of the sink is rusty or dusty
How to replace a bathroom faucet
1. Clear out the vanity and take a photo
Empty the cabinet so you can work without knocking things over. Set a bucket and towels below the valves. Then take a quick photo of the supply lines and any pop-up drain linkage. It can save you a little guesswork when it is time to reconnect everything.
2. Turn off the water and relieve the pressure
Under the sink, turn both angle stops clockwise. Open the faucet after that to empty the water left in the lines. Make sure both hot and cold water are off before you loosen a connection.
Do not force a stuck valve. If it will not close, continues to drip, or looks badly corroded, stop there. Repairing the valve is the first job. Disconnecting a faucet while water is still live can turn a small project into a wet cabinet and a bigger repair.
3. Remove the old faucet
Loosen the supply-line nuts with an adjustable wrench. Brace the angle stop with your other hand while you work so you do not twist an older valve or pipe. A small amount of water will drain from the lines, which is normal.
Next, find the mounting nuts directly below the faucet. A basin wrench is often the easiest way to reach them. Once the nuts and washers are off, lift the old faucet out from above. If it will not budge, old sealant or mineral buildup may be holding it in place. Work it gently from side to side rather than prying hard against the sink.
4. Clean the sink deck
Scrape away old putty, silicone, and mineral buildup around the faucet holes. Wipe the area clean and dry. The new gasket needs a flat surface to seal properly, and a clean sink deck also makes the finished installation look better.
5. Set and secure the new faucet
Follow the faucet instructions for the gasket, deck plate, or seal. Set the faucet in place, then step back and check that it is straight before tightening anything underneath. Install the washers and mounting nuts in the order shown in the instructions.
Start each nut by hand. Tighten until the faucet is stable and no longer swivels. There is no prize for making the nuts as tight as possible. Too much force can damage the mounting hardware, the sink, or the countertop.
6. Reconnect the supply lines
Connect hot to the left angle stop and cold to the right. Thread every nut by hand first. If a nut will not start smoothly, back it off and try again. That is usually a sign the threads are not lined up.
Once the nuts are seated, use the wrench for a small final turn. A connection should be snug, not forced. Over-tightening can damage a fitting and create the very leak you are trying to avoid.
7. Reconnect the pop-up drain if you are changing it
If you are also replacing the pop-up drain, assemble and adjust it before testing the faucet. Make sure the stopper opens and closes. Then fill the basin partway, pull the stopper, and watch the drain connections while the water runs out.
8. Turn the water back on and flush the faucet
Open the shut-off valves slowly. With the faucet still off, look under the sink for a minute. Then run cold water, hot water, and mixed water. Some faucets call for removing the aerator during the first flush. If yours does, reinstall it once the water runs clear.
Do this leak check before you reload the cabinet
- Feel around both supply connections while the faucet is off.
- Run cold water for a minute and check again.
- Run hot water for a minute and check again.
- Move the handle through its full range and look around the faucet base.
- If you worked on the drain, fill the basin and let it empty while you inspect underneath.
- Dry the connections with a towel, then look once more for a new drop of water.
Common bathroom faucet installation mistakes
Using putty when the faucet uses a gasket
Plumber's putty is not a universal step. Many faucets use a factory gasket, and some specify a particular sealant. Use the method in the installation sheet. Adding putty where it does not belong can keep the faucet from sitting flat.
Finding out too late that the shut-off valves do not work
Test the angle stops before you remove the old faucet. A valve that will not fully close needs attention before you disconnect the water line.
Cranking down on every nut
Most leaks come from a damaged seal, crossed threads, or a connection that is not seated correctly. More force does not fix those problems. Hand-tighten first, then use a wrench only for the final snug turn.
Putting everything back before testing
A connection can seem dry until water has been running for a few minutes. Test both temperatures and inspect the drain if you touched it. Keep the vanity empty until you know the area stays dry.
Frequently asked questions
How do you change a bathroom faucet step by step?
Make sure the new faucet fits the sink. Shut off the hot and cold water, disconnect and remove the old faucet, clean the sink deck, mount the new faucet, reconnect the supply lines, and test for leaks. If you are changing the drain too, test it by filling and emptying the basin.
What is the easiest bathroom faucet to install?
The easiest replacement is one that matches the holes already in the sink and leaves enough room under the vanity for the mounting hardware. A single-hole faucet can be a simple swap on a single-hole sink. The best choice still depends on your existing layout and the space around the valves.
Do you put plumber's putty under a bathroom faucet?
Use it only when the faucet instructions call for it. Some models use a gasket or an integrated seal instead. Using both when they are not recommended can make the faucet sit unevenly and leaves more cleanup later.
How long does it take to replace a bathroom faucet?
A simple swap often takes an hour or two, especially if this is your first time working under a sink. Set aside more time for corroded mounting nuts, stubborn shut-off valves, or a drain replacement.
How much does it cost to have a plumber replace a bathroom faucet?
Plumbing rates vary by location. The price also depends on whether the existing valves, pipes, and drain are in good shape. A straightforward faucet swap costs less than a visit that also requires valve or pipe repairs. Ask for a local estimate after explaining what needs to be replaced.
When should you call a plumber?
Call a plumber if you cannot shut off the water, find a damaged valve or pipe, cannot remove a badly corroded faucet, or still have a leak after checking the connections. It is better to fix those problems before water damages the vanity or wall.
Choose the replacement after you confirm the mounting setup
Once you know your sink-hole configuration and have measured the available space, browse our bathroom faucets to find a replacement for your vanity.