How To Replace A Bathroom Faucet

Replacing a bathroom faucet that is leaky or outdated can be a very simple and inexpensive project if done correctly. It is a process that should take no less than one hour and can be done with just a bucket and a wrench or spanner.

However, if done incorrectly, it could and up wasting more time and money in the long run. This should not worry you though as this article will guide you on how to replace a bathroom faucet, which should be easy enough even for people who have never tackled any kind of plumbing project before.


Normally, there are 3 main types of faucets which you can find: the single hole, the 4-inch triple hole, and the 8-inch triple hole also you can identify if it’s touchless kitchen faucet. The single hole faucet has the center controller operating as the mixing valve and the spout.

In both the 4-inch and 8-inch triple faucet types, the center controller usually is just the spout and the mixing valves can be either 4 or 8 inches from the middle on each side.

The installation of the faucet can be done either to the sink or the countertop depending on your situation. Therefore, when replacing the faucet, you can simply change the faucet type that is being used and when using a new faucet instead, acquire one that matches the one that you already have.

How To Replace A Bathroom Faucet


Once you have identified and picked out the right faucet you intend to replace, put together all the things that you need and make sure that you double check everything is there in order to avoid any other unnecessary trips back to the store.

Ensure that you properly check the fittings located at the end of your new faucet against your water line extensions. You can also take this chance to substitute any flexible lines and choose a set that has a feature to shut off automatically in the event of a leak.

If the sink drain is also going to be replaced, ensure the setup of the P-trap closely just in case you require any new extensions or 0-rings.

Taking Out Old Faucet and Hardware Attached to It

When taking out an outdated or damaged faucet, begin by the right shower valve shutting off and then turn on the faucet so as to drain down any residual pressure.

Next, use a wrench or spanner to loosen the flexible extension and remove it from the faucet and then drain any remaining water into a bucket and then take out the line from the shut-off valve. Washers and nuts are typically the hardware used to secure a faucet and are located under the sink.

Make sure that you take out any and all hardware connected to the faucet and this also includes the bolt at the rod of the drain extension. After all the equipment attached to the faucet has been removed, you can now gently take out the faucet from the top.

Taking Out Old Faucet and Hardware Attached


Before you begin installing your new faucet, ensure that you refer to the installation manual that came with the faucet as most faucets tend to differ greatly depending on the manufacturer.

The installation process that is shown here is generally applicable to most of the faucets used today but may require some modification here and there depending on what setup you have.

In general, there will be a spout, countertop or sink, a gasket or a plumber’s putty, a nut for mounting, and a saddle or large washer. In this case, we will be using the example of a plumber’s putty.

If this is your first time hearing of a plumber’s putty, simply imagine working with gray modeling clay. Take out a small lump of the putty in your hand and then roll it to the front and back until a 1/4-inch diameter rope has been formed.

Apply the putty around the spout’s base area in order to prevent any water from splashing into the cabinet. Once this has been done properly, begin installing the spout and then make sure that the mounting night is properly tightened from below the sink using a wrench or spanner.

Assembling the Mixing Valves

If the faucet in use is the single hole type, you can skip this step. Start by assembling both the cold and hot mixing valves. In most cases, a nut and a washer will be used to tighten the valve while a C-clip and a large washer are used to hold the valve firmly at the top. If a plumber’s putty is being used, apply it to the top washer’s lower side part that has been sculpted.

Finally, make sure that the C-clip is installed properly and the nut has been tightened firmly from below the sink.

Assembling the Mixing Valves

Threading the Trim

The installation of the top trims of most faucet types is normally done by threading the trim to the mixing valve. Ensure that the handle is aligned well in off mode before you begin the trim threading process.

Next, ensure that the water lines are hooked from below the sink. If you are lucky, your faucet will include easy snap-end fittings that will allow you to do this easily. If it does not include snap-fittings and uses threaded NPT ones instead, make sure that a plumber’s tape is used on any connections that don’t require a gasket seal or rubber.

Finally, begin installing the extensions for the water line to the mixing valves and shut off.

Threading the Trim

Re-installing the Drain Rod

Lastly, you can now re-install the rod for draining and then tighten the clamping bolt. Ensure that all of the fittings are checked properly and then proceed to turn on the shut-off valves. Look around the entire installation for any leaks and if everything is in order, test the faucet installation for a few minutes.


While most faucets will last for quite a while before they require replacing, their design normally looks outdated after a few years. If you follow the above steps on how to replace a bathroom faucet, you’ll soon understand that replacing a bath faucet is a quick and very rewarding project when it’s done right.

Additionally, if you also decide to use a faucet that includes trims and mixing valves separately, you can easily replace or upgrade the faucet and avoid any extra work or waste.

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