How do I Install a Sink?

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  • Written By: Nychole Price
  • Edited By: Bronwyn Harris
  • Last Modified Date: 07 October 2019
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Installing a sink is a pretty basic process, and can be performed by anyone with a basic knowledge of tools. A sink installation guide is usually included in the box and will provide you with any minor details that apply specifically to that sink. An over-mount sink is the most common kitchen and bathroom sink due to the fact that it is the easiest to install.

Before beginning to install a sink, you must first turn off the water supply. If you are replacing a sink, you will also need to remove the water supply lines and drain pipe. Remove the old sink and set it aside.

Before you install a sink, you need to determine where you want it. It should be centered with the overhead cabinets in order to keep the room balanced. The cabinet that the sink will be installed on must accommodate the size of the sink. Leave at least 1-1/2 inches (3.81 cm), but no more than 3 inches (7.62 cm), of countertop space in the front of the sink. If you are replacing an old sink and using the preexisting counter top you must verify that the faucet holes align with the new sink.


Begin the sink installation by outlining it on the countertop you wish to use. Place the sink upside down on the counter top or plywood base. Trace the sink with a carpenter's pencil. With a ruler, mark a second line 1/2 inch (1.27 cm) inside the first line. Repeat the process with the other three corners. The inside lines are where you will be cutting.

Drill holes in the four corners of the outline to introduce your saber saw and begin cutting. These holes also allow you to cut around the corners without bending the saw blade. Use the same drill to make holes for the water supply lines that connect to the faucet.

Clean the surfaces that contact the sink with denatured alcohol and a lint-free cloth. Before fastening the sink to the counter top, install a sink faucet and secure with latex caulk. Fasten the flexible water supply lines to the faucet's water supply tubes with pressure couplings and hand tighten. Outline the cutout with caulking.

Flip the sink upright and insert it into the cutout. Guide the flexible water supply lines through the previously drilled holes. Apply even pressure to the sink to be sure it is firmly fastened then wipe up any caulking that may have pushed out from under the sink. Install a sink drain with plumbers putty then secure and tighten the lock nut. Allow the putty to dry for 24 hours.

Connect the water supply lines to the home water supply using pressure couplings. Hand tighten first to verify that the connection is correct then tighten using a wrench. Install a sink drainpipe and S-trap to the bottom of the sink and the household drainpipe.

Turn on the water and verify that there are no leaks. If leaks are detected tighten the pressure couplings with a wrench. This is usually the source of all leaks.


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