Can I Change Vanity Under Quartz Countertop?

Installing a new vanity under an existing quartz countertop can be done, but it requires some careful planning and precision work. Here is a comprehensive guide on how to change out a vanity while keeping the quartz countertop intact.

Steps for Changing a Vanity Under Quartz

Changing a vanity under quartz countertops involves the following key steps:

Prepare the Workspace

First, completely clear off the countertop and remove everything from under the sink and vanity. Take out all drawers, plumbing fixtures, and accessories. Protect the floor using a drop cloth in case tools or materials drop.

Disconnect Plumbing and Electricity

Turn off water supply lines and disconnect drain pipes under the sink. Also shut off power to any outlets or lighting attached to the vanity.

Detach Countertop

Unscrew caulk or adhesive between the backsplash/sidesplashes and wall. Use a putty knife. Carefully pry the countertop off the vanity using a pry bar. You may need to cut through caulk adhering it to the vanity.

Remove Old Vanity

Take off any mounting screws or nails securing the vanity to the wall. Slide out or lift off the old vanity cabinet. Remove any remaining adhesive or caulk remnants.

Install New Vanity

Slide the new vanity into place, aligning it properly under the countertop overhang. Shim the cabinet if needed to adjust the height. Attach securely to wall studs using screws.

Reinstall Countertop

Apply fresh caulk to the underside of the countertop perimeter. Carefully lower the countertop back down onto the new vanity. Press down firmly to adhere. Replace any backsplash pieces.

Reconnect Plumbing and Electricity

Hook up drain pipes and water supply lines. Make sure all connections are tight with no leaks. Turn water back on and test. Reconnect any wiring for lighting or outlets.

Add Finishing Touches

Drawers, doors, and other hardware can be reinstalled. Seal any gaps with caulk and repaint if needed. Add back sink, faucet, and accessories.

Tips for Changing a Vanity Under Quartz

  • Go slowly and carefully when prying the countertop loose to avoid cracking it.
  • Take detailed photos of plumbing and wiring connections before disconnecting.
  • Measure carefully to get new vanity aligned properly under overhang.
  • Get help lifting heavy countertops; don’t risk injury or damage.
  • Use shims to adjust if vanity doesn’t fit perfectly flush to wall.
  • Make sure new vanity is securely mounted into wall studs.
  • Use painters tape when caulking to get a clean line. Remove before it dries.
  • Get professional help if you don’t feel comfortable doing electrical or plumbing work.

FAQs About Changing Vanities Under Quartz

Can I install a new vanity that is a different width?

Yes, as long as the countertop overhang matches up correctly and any sidesplashes cover the edges properly. The depth can also be adjusted.

Do I need to take out the sink and faucet?

Generally, yes. Detaching from the countertop will allow it to come free more easily and avoid damage.

Do I need to cut the quartz countertop at all?

Usually not. Quartz is not typically cut or modified during a vanity replacement. Carefully lift it free intact.

Can I do this project myself or do I need a contractor?

An experienced DIYer can typically handle this job themselves. Professional help may be needed for the electrical or plumbing parts.

Will I need new caulk or adhesive?

It’s best to use fresh caulk and adhesive when re-installing the countertop to ensure a strong bond. 100% silicone caulk generally works best.


Changing a vanity while keeping the existing quartz countertop is definitely doable for many homeowners. Careful preparation and precision work is required to remove and reinstall the countertop without damaging it. Seeking professional assistance may be wise if you don’t feel comfortable doing all the steps alone. With some patience and the right techniques, you can give your bathroom a fresh new look with a vanity update under the existing quartz.