How to Replace a Kitchen or Bathroom Faucet

Co-authored by Patrick Johns

Last Updated: December 11, 2022 References Approved

Is it time for an update for your faucet? If it's just dripping, you can usually just replace a washer or other seal. Don't worry if you need to replace the whole thing though. The procedure is pretty straightforward, especially if you have the right tools.

Steps

1
Inspect your sink. Check to see how many openings there are and how far apart they are. You may have to look underneath to be sure. For bathroom faucets, in particular, the two handles may be joined with the spout to become a single unit or they may be spread apart from it. You will need this information to choose the correct replacement.^{[1]
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2
Obtain a replacement faucet. You'll probably be using this faucet for a long time, so it's worth investing in a good-quality faucet.^{[2]
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- It's possible to spend anywhere from about $20 to $500 and above on a faucet. Read reviews and decide for yourself how much of what you are paying is for quality and how much is for designer names/styling and fancy features.
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3
Review the instructions that come with the faucet. They can range from detailed and helpful to minimal and frustrating. When in doubt, defer to the manufacturer's instructions rather than those you find elsewhere.
4
Consider buying a basin wrench for under $20. It's a tool designed to reach way up behind your sink and remove the two big nuts on each side of the faucet that hold the faucet tight against the sink. If you can't loosen the nuts by hand or with the tools you have on hand, a basin wrench will make the job easier.
- You will also need a crescent wrench to disconnect the supply line from the shut-off valve part.
5
Remove everything from under the sink and store it well out of your way.^{[3]
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6
Get plenty of light under your sink so you can see what you are doing up there. Arrange any portable lamp or use a drop light if you have one.^{[4]
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7
Turn off the water to the faucet. Under the sink, you will see two supply lines coming out of the wall and going up to your faucet. There should be a valve on each one, one for hot and one for cold. Turn both of these valves off by twisting them clockwise as though they were faucets.
8
Loosen the tube nut that's just above the valve on each tube and lift the tubes out of the valves. Water will come out of each tube now as they drain back from the faucet so you'll need a towel to soak up this water.^{[5]
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- It's a good idea to replace the supply lines when you replace the faucet, if they are old, especially if they were the flexible sort. If you have solid tubing, it isn't generally necessary unless it doesn't reach the new faucet. If you're not replacing the supply lines, you may only have to disconnect them at the top. A braided, stainless steel reinforced supply line will virtually eliminate the possibility of flooding from the line bursting.
9
Remove the large nuts that hold the faucet in place. This is where you'll want to use a basin wrench if you have one. You may have one, two, or even three nuts. Your sink may look different because they may be hard plastic, brass, or silver-colored metal. This may be the hardest part of the job, since the threads are often quite long and they may be corroded or have a lot of hard water buildup, so that the nuts are difficult to turn. Hang in there! It gets easier from here.
10
Lift the old faucet up, tubes and all, right out of the sink.
11
Now, examine the tubes carefully. If they are damaged in any way, take one with you to the store where you bought the wrench and buy two, new, gray plastic tubes the same length. They come with new nuts and end fittings.
12
Before installing your new faucet, give the sink a good cleaning where the old faucet was mounted. You may have to scrape and scour to remove hard water deposits, although depending on the new faucet, some of the area may be covered. Try vinegar or an acid cleaner to help dissolve hard water deposits.
13
Check your new faucet base and see if they include a soft plastic gasket. You need something like this to seal around the base to keep water from getting under it. If not, buy some plumbers' putty. It's gray in color and is something like chewing gum. Stick a bead of it around the base before you mount the new faucet. When you tighten down those two big nuts, it will squeeze a little of this putty out but it's easy to clean up with rubbing alcohol.^{[6]
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14
Attach the new tubes to the new faucet before you install it in the sink.^{[7]
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15
Assemble the new faucet. Sometimes there is a separate flange or plate that slips over the bottom. If you want this flange installed, or if there are any additional hoses to assemble, do so now.
16
Slip the new faucet through the hole(s) in the sink.
17
Tighten the new nut(s) from below the sink, but stop when you get close.^{[8]
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18
Before you get those two big nuts tight, take a look at your new faucet, see if it is straight or angled one way or the other, then finish tightening up the nuts.
19
Insert the tubes into the valves under the sink and tighten up the tube nuts.
20
Turn on the water and check for any leak. Wait for ten minutes and check for leaks again. If everything seems fine, you're done; if not, tighten the fittings a little more and check for leaks again.^{[9]
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Community Q&A

Question

Can I convert my copper pipes to PVC pipes?

DonazP

Community Answer

Yes. There are transitional fittings that you can purchase at a local hardware store. You will need a copper to PVC adapter that connects to the copper piping. From that fitting, you can then install your PVC pipe and fittings.
Question

How do I get a faucet to come out of a wall?

DonazP

Community Answer

Purchase a faucet that is designed for in-wall use.
Question

How do I replace the inside part of a faucet?

Community Answer

It depends on the type of faucet you have. If you know the manufacturer, you can search for directions online. Otherwise, you can ask help from a plumber or handyman.

Warnings

Depending on the age of the building and the water pH levels, the water pipes in the wall can be corroded, thin and therefore very weak and easily damaged. Be prepared for this by knowing where the main shut-off valve is before you start.

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Sometimes the old shutoff valves under the sink are so corroded or gummed up with deposits that they no longer work or they leak. If you encounter this, you will have to shut off all water at the main shutoff and replace them. If you are doing so, it is well worth the money to spend an extra couple dollars for a ball valve. Not only are they easier to use, requiring only a quarter turn to turn on and off, but they are far less likely to cause problems down the line when you really need the valve to work. Also, if space is tight under the sink, you can get ball valves with outlets that come out at different angles.

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Wear safety glasses. Even if it's fairly unlikely that much of anything will fly off, it will protect your eyes from dropped objects and any loose debris that chips off and falls.

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