How to Install a Dishwasher Under Quartz Countertop

Installing a dishwasher under a quartz countertop requires careful planning and execution to ensure a seamless look and proper functionality. Quartz is an extremely durable material, but it does require special care during certain installation procedures. With some handy tips and the right tools, installing a dishwasher under quartz can be a straightforward process.

Choose the Right Dishwasher

Not all dishwashers are created equal when it comes to installing under quartz. You’ll want to select a dishwasher that has an adjustable/folding upper rack. This allows the rack to fold back out of the way so you can slide the dishwasher into the opening underneath the countertop. Standard dishwashers with a fixed upper rack will be very difficult, if not impossible, to install.

You’ll also want a dishwasher with an electronic control panel on the top front edge, rather than mechanical push buttons on the face frame. This allows the dishwasher to slide flush underneath the countertop overhang.

Finally, pay attention to the height dimensions. Choose a dishwasher that will fit properly into your cabinet space underneath the counter.

Prep the Countertop Installation Area

Installing the quartz countertop is generally done before installing the dishwasher, so you’ll need to prep the space under where the dishwasher will go.

  • Mark the area under the sink where the dishwasher will be located. Make sure to account for the dishwasher width and cabinet clearances.
  • Cut out a hole in the sub-counter substrate to allow space for the dishwasher to slide into place after the countertop is installed.
  • Install any wiring, plumbing, drain lines before installing the quartz.

Create a Smooth Finished Edge

The front edge of the countertop where it meets the dishwasher must be finished with a smooth polished look. This is because the dishwasher face frame will be exposed underneath the countertop overhang. Any rough or unfinished edges will be clearly visible.

Use a high-quality router and specialty bits to get a flawless smoothed edge. Take your time with this step to avoid any imperfections.

Allow Space for Cutouts

Quartz countertops are custom cut with any openings or cutouts needed for the sink and faucet.

Be sure to also account for the control panel of the dishwasher when cutting the quartz. The control panel housing will need to poke up through a cutout hole in the countertop. This allows access to the controls while keeping the dishwasher hidden underneath.

Carefully measure and cut the hole so the control panel fits flush and tight.

Test Fit the Dishwasher

Before permanently installing the dishwasher, do a test fit. Turn off power to the electrical and water lines. Carefully slide the dishwasher into place under the countertop opening.

Verify that:

  • The dishwasher clears the side cabinets and has proper clearance above for the countertop.
  • The control panel fits correctly in the cutout hole.
  • Doors and racks can open without interference.

Make any needed adjustments before proceeding.

Fasten the Dishwasher Securely

Use mounting brackets screwed into the underside of the countertop to hold the dishwasher tightly in place. This prevents any shifting or movement which could damage the quartz.

You can also attach the sides of the dishwasher frame to the cabinet face frames for added stability.

Use vibration damping materials between the dishwasher and cabinetry to minimize noise.

Connect Water, Power, and Drain Lines

With the dishwasher firmly installed, you can now hook up the water inlet, drain line, and electrical power.

  • For the water line, use a flexible stainless steel braided hose. Securely tighten all compression fittings.
  • Connect the drain hose to the sink drain pipe per manufacturer instructions.
  • Connect power through an electrical junction box, securing all connections.

Finally, slide the dishwasher out just enough to attach the faceplate panels. Then carefully push back into place, power it up, and test operation.

Tips for a Seamless Look

  • Apply silicone caulk around the control panel cutout to create a watertight seal against the quartz.
  • Use white plastic trim molding around the bottom dishwasher opening to match the face frame on white dishwashers.
  • Adjust the dishwasher rack height so the upper rack doesn’t bump against the countertop.
  • Use a heat shield film on the underside of the quartz to protect from the heat of the dishwasher.

With attention to detail during installation, you can have a perfectly integrated dishwasher that seamlessly blends with the beautiful quartz countertop.

Frequently Asked Questions

What type of dishwasher should I use under a quartz countertop?

Look for a dishwasher with an adjustable upper rack that folds down, electronic controls on the top front edge, proper height dimensions, and a stainless steel tub. This allows for easier installation under the countertop.

How do I cut the hole for the dishwasher control panel?

Very carefully measure and cut the hole according to the dimensions in the dishwasher installation manual. Use a jigsaw with a quartz specialty blade. Cut slowly and keep the hole edges smooth.

Should I attach the dishwasher to the countertop or cabinets?

It’s best to attach the dishwasher brackets securely to the underside of the countertop. Also attach the sides to the cabinet face frames. This keeps the dishwasher firmly in place.

What can I do if there is a gap between the dishwasher and countertop?

You can install trim molding around the edges to cover any small gaps. Silicone caulk can also fill small gaps for a watertight seal. Make sure the dishwasher height is adjusted properly.

How do I protect the quartz from dishwasher heat?

Apply a heat shield film or thermal insulation material to the underside of the quartz around the dishwasher. This prevents heat damage to the quartz surface.


Installing a dishwasher underneath a quartz countertop is easy when you choose the right dishwasher, allow for proper cutouts, create finished edges, securely attach the dishwasher, and carefully seal around openings. Paying close attention to the details will ensure your dishwasher blends seamlessly with the beautiful quartz countertop. With some patience and handy DIY skills, you can have an integrated modern kitchen design.