Project Guide

How to Install a Dishwasher

Prep the Dishwasher for Installation
A person handling a dishwasher before installation
  • When installing a dishwasher, first read the manufacturer’s instructions for the location of the power supply and drainage lines.
  • Remove the bottom access panel to find the power cord connection, inlet solenoid valve and drain outlet.
  • Measure and mark the location to cut a 1 ½-inch hole in the wall of the cabinet. 
  • Slide the dishwasher into place and verify the location.
  • Slide the dishwasher out and set aside to make room for more work beneath the cabinet.
Cut the Hole for the Supply and Discharge
A water supply hose feeding from a hole in the wall

Cut a hole in the cabinet wall with a power drill and hole saw.

Connect the Lines
A person connecting electric wires
  • Run the drain tubing, supply line and power cord.
  • Slide the dishwasher into place and level by adjusting the threaded feet.
  • Tighten the locknuts on the feet.
  • Install the compression elbow on the dishwasher solenoid.
  • Bend the supply line so it lines up with the elbow.
  • Slide the compression nut over the tubing and then place the compression ring over the end.
  • Connect the tubing to the solenoid using an adjustable wrench.
  • Install a tee on the hot water supply.
  • Measure and cut tubing to the tee.
  • Connect the compression fittings.
  • Turn on the water supply, inspect for leaks and tighten the connections.
Install the Drain Line
A person tightening plumbing fixtures under a sink
  • Replace the regular sink drain tailpiece with one that has a side inlet.
  • Connect the drain line to the dishwasher outlet using the hose clamps.
  • Measure the hose and cut it to length so it connects to the inlet with another hose clamp.
Connect the Power
The rear exterior of a dishwasher
  • To complete your dishwasher install, match the wires by connecting white to white, black to black, and green to the ground screw.
  • If the colors differ, read the manufacturer’s instructions for connecting the wires.
  • Connect the wires with wire nuts.
  • Plug the supply cord into an electrical outlet installed under the sink cabinet.

Consider the following when shopping for new appliances:

  • 3-prong plugs are used for homes build before the year 2000. 
  • 4-prong plugs are used for homes built after the year 2000. 

When you add professional installation to your new appliance purchase from The Home Depot, a compatible cord is required. The delivery agent carries both types of cords to make sure your home is covered.

When you purchase a new appliance from The Home Depot without professional installation, a 4-prong cord is sent by default. If your home is equipped with a 3-prong outlet, you will need to purchase a 3-prong cord or connector adapter separately. 

Now that you've learned how to install a dishwasher, you may be interested in hiring a professional. For information on the cost of installing a dishwasher through The Home Depot, please see our Appliance Delivery and Installation Services page.