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How to Install a Wall Mounted Sink

wall mount sink installed
by Badeloft | June 30, 2016

Wall mounted sinks lack the cabinetry of traditional vanity sinks, making installation a bit more challenging in that there’s little room for error and you can’t hide your mistakes. Because of the delicate nature of wall mounted sinks, make sure to enlist the help of a friend.

You’ll also need to gather the following before you begin:

  • Tools: Tape measure, utility knife, stud finder, drill, circular saw, drywall sander, putting knife, 10-inch drywall knife, hacksaw, level, adjustable wrench, large slip-joint pliers, and tubing cutter.
  • Supplies: 3-inch wood screws, drywall screws, lag screws and washers, joint compound, drywall tape, plumber’s putty, thread seal tape, silicone tub and tile caulk, 2 x 8 lumber, and drywall.
  • Hardware: Freestanding sink, bathroom faucet, chrome P-trap with flange, chromed (or metal-plated) water supply tube with matching compression fittings, pop-up drain kit, two chrome (or metal-plated) compression-fit water shutoff valves, and wall flanges.

Before You Begin the Wall Mount Sink Installation

You’ll need to measure and mark the plumbing carefully as there’s little room for error. Your hot and cold water supply lines will be exposed while the waste pipe and trap will be hidden within an opening on the back of the pedestal of the freestanding sink.

Preparing the Wall Mount

The basin sits on top of the brackets flush against the wall. The sink’s mounting bracket will need to be installed securely in the wall to support the basin. This typically requires cutting into the drywall.

Measure the wall from the floor to the sink’s mounting brackets and mark the wall. Use a stud finder to find the studs. If they studs are not ideally located, cut out a section of drywall and then install a piece of 2″ x 8″ lumber between the studs (cutting it to size). Repair the wall with a piece of new drywall cut to size and patch and finish the wall using a clean piece of drywall, drywall tape, putty, and paint.

Install the mounting hardware into your newly installed wall brace, making sure to double check the height and alignment of the freestanding sink.

Preparing the Plumbing

After turning off the main water supply, open a faucet in another room to relieve pressure. Place a bucket near the copper supply lines and use a tubing cutter to cut the hot and cold water supply lines about 2 inches from the wall.

Measure from the back of the sink’s mounting bracket to the center of the drain. You’ll need to line up the drain line in the wall with the chrome P-trap, making sure the P-trap’s vertical coupling is centered precisely at the same distance from the wall as the drain. Use the hacksaw to cut the PVC drain line at the point where the PVC shoulder and elbow meet.

Place the wall flange, a compression coupler, the metal cap of a chrome compression shutoff valve, and the end of the valve into position on one of the water shutoff valves. Adjust the metal cap so it meets the nipple. Use a wrench to tighten it. Push the wall flange into position and then do the same process with the other shutoff valve. At this point, you can turn the water to the house back on and make sure there are no water leaks.

Installing the Drain Kit

Depending on the sink’s design, you might need to install the drain kit into the sink basin before mounting the basin. Use plumber’s putty around the drain flange, firmly pressing it into position through the drain hole and securing the kit in position with the washers and coupler nut.

Attaching the Faucet

Install the faucet into the sink basin before mounting the basin. You’ll initially hand-tighten the mounting nuts, allowing you to adjust the faucet’s position before tightening it into place with a pair of slip-joint pliers. Later, you’ll attach the water supply tubes.

Mounting the Basin

Now that the drain kit and faucet are in place, it’s time to finish the plumbing and mount the basin onto the wall. The drain tailpiece will need to be attached to the drain nipple through the base. Your approach here may depend on the design of the small wall mounted sink. This is a good time to have a helper on hand to ensure that the sink doesn’t topple as you make these connections. Use your slip-joint pliers to tighten the joint.

Install the remaining portion of the P-trap to the drain’s tailpiece at the appropriate height. Start by test-fitting the elbow assembly and P-Trap Make sure to measure (and mark your measurements) from the bottom of the existing P-trap to ensure a proper fit once you slide the pedestal into place. Add plumber’s tape to the P-trap’s threads and make your connections. Tighten the nuts by hand, following with pliers.

Next, position the drain rod through the hole and connect it to the extension with the slip spring or screw provided with your kit. Use the lift rod to lift the sink’s stopper, adjusting as needed.

Securing the Wall Mounted Sink

The basics are now in place. You’ll need to carefully position the basin against the wall, securing the basin’s mounting bracket to the wall mount. Once secured to the wall, connect the P-trap halves and tighten with your pliers.

Slide the sink into place against the wall. Lift the sink slightly to secure the mounting bracket on the back of the sink to the wall mount. Connect the two halves of the P-trap and tighten the coupler with the slip-joint pliers. Use silicone caulk around the joints where the sink meets the wall.

Connecting the Water Supply Lines

Prepare the water inlet valve nipples by wrapping thread seal tape around them. Cut two chrome water supply tubes (one for hot water, one for cold) that are one inch longer than the distance from the water supply valves to the corresponding water inlet.

Place a coupler and ferrule to each end of each tube. Start by connecting one end to one of the water supply valves using an adjustable wrench. Carefully align the tube to the faucet inlet, bending it as needed, and connect it to the nipple of the faucet. Do the same for the other water supply line.

At this point, you may turn on the water supply inlets, one at a time, to test your faucets and drains. Remove the aerator and filter of the faucet as debris can be expected. Let the water run for about a minute on each water supply line. Turn off the faucet, replace the aerator and filter, and check for any leaks. Adjust as needed. View our guide on how to install a freestanding tub.

Watch Our Video on Installing a Wall-Mounted Sink:


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