How to Enlarge a Hole in Quartz Countertop

Gather the Proper Tools

You will need a few specialty tools to enlarge the hole properly:

  • Diamond-grit hole saw – Use one specifically designed for stone to cut a clean edge without chipping. A tungsten carbide grit edged hole saw also works.
  • Masking tape – To help reduce vibration and chip-out when cutting.
  • Electric drill – Preferably a variable speed drill to control RPMs.
  • Eye protection – Safety glasses to prevent eye injury from debris.
  • Ear protection – To reduce noise from drilling.
  • Dust mask – To avoid breathing in quartz dust particles.
  • Shop vacuum – To contain and collect quartz dust as you drill.

Prepare the Countertop Surface

Proper preparation of the quartz surface will help ensure clean cuts:

  • Clear countertop around the existing hole so you have room to work.
  • Cover surrounding area with painter’s tape to reduce vibration.
  • Mark the new larger hole size using a pencil. Make concentric circles working out from existing hole.
  • Make sure quartz surface is clean and dry. Wipe with denatured alcohol to remove any grease or dirt.

Drill the New Hole Size

Go slowly and be cautious when using the hole saw on the quartz:

  • Set the variable speed drill to the lowest RPM setting, around 600-800rpm. High speeds can crack quartz.
  • Position hole saw inside pencil line marking new hole size.
  • Begin drilling slowly with light pressure. Let the diamond grit do the work, no need to push hard.
  • Drill partially through thickness of countertop, then flip over and complete hole from underside. This helps prevent chip-out.
  • Use shop vac near bit to contain dust. Pause periodically to empty vacuum.
  • Work cautiously around edges of existing hole to avoid cracking.
  • Once complete, smooth any rough edges with 100 grit sandpaper.

Clean Up and Finish the Hole Edge

Proper cleanup and finishing ensures a professional enlarge hole in quartz countertop result:

  • Remove all masking tape from countertop surface.
  • Wipe away any quartz dust using a soft cloth and denatured alcohol.
  • Carefully scrape away any remaining pencil marks using a plastic scraper.
  • Use 100-220 grit sandpaper to lightly finish and smooth cut edges of hole.
  • Finish with a polish using 00 grade steel wool to create smooth cut edges.
  • Examine hole for any cracks or chips. Fill small chips with clear epoxy adhesive.
  • Clean countertop one final time and install sink/faucet into newly enlarged hole.

By following these steps, you can successfully make a clean, polished enlarge hole in your quartz countertop. Always work slowly and cautiously when drilling to avoid cracking this durable but sensitive material. The right tools, technique, and patience will provide professional looking results.

Frequently Asked Questions About Enlarging a Hole in Quartz Countertop

Can I enlarge a hole in quartz countertop myself or do I need a professional?

With the right tools and precautions, it is possible for a home DIYer to enlarge a hole in a quartz countertop. Go slowly, use a diamond-grit hole saw, and follow proper techniques to reduce the risk of cracking the quartz. Professionals have specialized tools and experience working with quartz, but with caution and patience, an enlarged hole can be done as a DIY project.

What is the best drill bit to use to enlarge a hole in a quartz countertop?

A diamond-grit hole saw designed specifically for stone cutting is ideal to enlarge a hole cleanly in a quartz countertop. Diamond grit blades will grind through the quartz much better than standard twist drill bits. Tungsten carbide grit hole saws also work well. Avoid cracking by running the drill at low speeds of 600-800rpm.

Can I use a jigsaw or angle grinder instead of a drill to cut a bigger hole in quartz?

It is not recommended to use a jigsaw, angle grinder, or similar abrasive cutting tools to enlarge holes in quartz countertops. The fast, vibrating motions of these tools often result in cracking and chipping of the quartz material. A diamond hole saw bit used with a drill provides the best control and cleanest cuts.

How can I prevent chipping when enlarging a hole in quartz?

Work slowly and cautiously to avoid chip-out when enlarging the hole. Tape around the hole to reduce vibration. Mark drill lines with light pencil markings. Let the diamond grit of the hole saw do the cutting using minimal pressure. Drill partially through from each side to prevent blow-out. Keep the quartz dust cleaned up during cutting. Finish edges smoothly with sandpaper and polish with steel wool.

Is there an easy way to smooth the cut edges of an enlarged hole in a quartz countertop?

Use 100-220 grit sandpaper after cutting to lightly finish and smooth the enlarged hole’s edges. Follow up with 000 grade steel wool and apply light polishing motions to create a smooth, professional cut around the quartz hole. Avoid using aggressive pressure which could chip the edges. Work patiently to polish for best results.


Enlarging an existing hole in quartz countertops is possible with the right preparation and tools. By using a diamond-grit hole saw, drilling slowly at low RPMs, controlling vibration, and finishing the cut smoothly, holes can be enlarged cleanly. Quartz does require extra care when drilling to prevent cracking, but taking precautions yields professional looking results. With caution and the proper technique, even first-timers can achieve an expertly enlarged hole in quartz countertops.