Lowe's Home Improvement

How to Install a Kitchen Sink

Learn to install a new kitchen sink with our easy-to-follow video and guide. In just a few steps, you can breathe new life into your kitchen.

Prepare for the New Kitchen Sink

Before you begin this project, read the manufacturer’s instructions and follow all local building codes. If you're not comfortable installing a kitchen sink or related components (faucets and garbage disposers), Lowe's can do it for you.

Select the appropriate type of replacement sink. Single- and double-bowl drop-in sinks can be installed into most countertop surfaces. Undermount sinks install beneath the counter and should only be used with solid-surface and natural or engineered stone countertops.

These instructions are for installing a drop-in sink.

Step 1

measure the old sink for an exact replacement

Measure your existing sink. If your new sink has different dimensions and drain location(s) than the unit it will replace, you may need to modify the countertop opening and / or plumbing.

Good to Know

For best results, make a drawing of your old sink with all measurements including distances from the sink wall to the drain center to use as a shopping aid and reference. Or you can remove your old sink, take it to Lowe's, and ask a Lowe's associate to help you select a replacement unit.

Caution

Wear safety glasses when working under the sink or cutting pipe and other materials.

Step 2

Decide if you will also replace the faucet or install additional components such as a sprayer, soap dispenser, on-demand hot water tap or filtered water tap.

Standard sinks have 1, 2, 3 or 4 holes on the rear lip for a faucet and additional components.

Installation of a new faucet and other components is easier if it is done when you are installing a new sink, since you can easily access the hardware with the sink out of the countertop.

Remove the Old Sink

Before you begin, snap a picture of your plumbing configuration. This serves as a handy reference if you're having trouble reassembling the plumbing later.

Step 1

water valve in "off" position

Turn off both the hot and cold water supply lines. The shutoff valves typically are in the cabinet below the sink or in the basement. If you cannot find them, turn off the main water line to the house.

Step 2

faucet in "on" position to take pressure off supply line

Turn on the faucet to relieve water pressure in the lines.

Step 3

disconnecting sink supply lines with a wrench

Use adjustable wrenches to disconnect the water supply lines to the faucet. Have a small bucket ready to catch any water left in the supply lines and drainpipes as they are removed.

Good to Know

Leave the faucet attached to the sink. You can remove both the sink and the faucet as one unit.

Step 4

P-trap loosened and disconnected from drain line

If you have a garbage disposer, turn off the circuit, then unplug it. Use pliers to disconnect the drainpipe and P-trap from the sink drain. Keep a bucket or pan underneath the drain to catch excess water.

Step 5

disconnecting dishwasher drain line from old sink

Then remove the dishwasher drain line.

Step 6

removing disposer from old sink

Remove the disposer following the manufacturer's instructions.

  • If you don’t have your disposer instructions, check the manufacturer’s website.
  • Have a bucket ready to catch any water.
  • Most disposers loosen at the mounting bracket connection to the sink drain and twist off.

Step 7

loosening clips underneath sink with a screwdriver

Locate the metal clips under the counter around the sink's perimeter. Loosen them with a screwdriver, open-end wrench or socket wrench and swing them toward the sink bowl.

Step 8

cutting caulk around sink lip with a utility knife

Cut the caulk around the sink with a utility knife.

Step 9

man pulling old sink away from the countertop

Push the unit from underneath and lift the old sink away.

Step 10

putty knife scraping away leftover grime, caulk and putty from sink opening

Use a putty knife to remove grime, caulk and old plumber's putty from the countertop. Likewise, clean any components you will re-install.

Install the New Sink

Step 1

man lowering new sink into countertop for test fit

Set the new sink in the countertop hole to verify that it fits. If necessary, modify the countertop opening using a jigsaw, router or tile cutter.

If your new sink has larger dimensions than the current countertop opening, turn the sink upside-down where you want it on the countertop. Trace the outline and create a new cutout with a jigsaw.

Step 2

shot of clips on underside of new kitchen sink

Remove the sink from the countertop hole to attach the clips, turned inward toward the sink bowl.

Step 3

affixing new faucet to the new sink

Install the faucet and additional components.

Step 4

rim of new strainer covered with plumber's putty

Apply a small bead of plumber's putty around the drain strainer and install the strainer, pressing firmly against the putty.

Step 5

Tilt the sink to its side to place and secure rubber gaskets and threaded flange to the underside of the sink drain. Repeat this for additional drains without disposers.

Step 6

towel wiping away excess putty from the new strainer

Remove excess putty with a soft towel.

Step 7

attaching disposer bracket to bottom of new sink opening

If you have a garbage disposer, use a screwdriver to install the mounting bracket to the bottom of the sink following the manufacturer's instructions.

Step 8

bead of sealant being applied to underside of the new sink basin

Apply a bead of silicone sealant to the edge of the basin.

Step 9

lowering sink and aligning with countertop hole

Lower the sink into the countertop opening, aligning squarely.

Step 10

clips secured in their outward position

From below the sink, rotate the metal attachment clips outward and tighten the nuts or screws.

Step 11

water supply connected with wrench tightening

Attach the supply lines to the water connections of the faucet and the supply pipes. Tighten the connections, taking care not to strip the threads or overtighten.

Step 12

screwdriver tightening the clamp that holds the discharge pipe in place

If you have a garbage disposer, install the unit following the manufacturer's instructions. Insert the discharge pipe and tighten the clamp.

Step 13

attaching dishwasher drain to new disposer

Reinstall the dishwasher drain.

Step 14

tightenting p-trap on drain configuration

Connect the disposer discharge pipe to the sink drain pipe and reattach the P-trap.

Step 15

kit containing alternate pipe lengths and flexible extensions

If your old drainpipes don’t line up to your new sink, you can make some simple adjustments.

If a pipe is too long (such as the tailpiece from the drain on the main sink):

  • Measure the length needed.
  • Add a little extra to the measured length to ensure a tight connection.
  • Wearing safety glasses, cut the pipe with a hacksaw.
  • Place a washer on the pipe, then slide a slip nut onto the pipe over the washer.
  • If you need a slip nut for the other end of the pipe, slide the slip nut onto the pipe facing the appropriate direction. Then, add a washer.
  • Hold the pipe in place and screw the slip nut(s) to the appropriate fittings.


If a pipe is too short:

  • Determine the length needed.
  • Add a little extra to the measured length to ensure a tight connection.
  • Purchase a longer pipe. Be sure the new pipe is the correct diameter.
  • If the pipe is longer than needed, cut it with a hacksaw. Wear safety glasses when cutting.
  • Place a washer on the pipe, then slide the slip nut onto the pipe over the washer.
  • If you need a slip nut for the other end of the pipe, slide the slip nut onto the pipe facing the appropriate direction. Then add a washer.
  • Hold the pipe in place and screw the slip nut(s) to the appropriate fittings.


If you need to make a bend (such as to a wall outlet):

  • First, try rotating the P-trap, outlet tee or any other pipes to line up appropriately.
  • If that’s not possible, use a flexible extension pipe to make the connection. Just bend the pipe to the desired position, and use rubber washers and slip nuts to attach it to the other plumbing.

Step 16

applying sealant to outer edge of sink with a caulk gun

Apply a small bead of sealant to the perimeter of the sink.

Step 17

checking for leaks with a clean, dry hand on the plumbing connections

Reconnect the power to the disposer. Turn the water on and check for leaks.