Can I Drill a Hole in My Quartz Countertop?

Quartz countertops are durable and beautiful, but you may need to drill holes in them for various reasons. The good news is that quartz is a non-porous material that can be drilled into with the right tools and techniques. Here is a comprehensive guide on drilling holes in quartz countertops.

Introduction to Quartz Countertops

Quartz countertops, also known as engineered stone, are made from ground quartz crystals blended with resins and pigments. The result is a highly durable, non-porous material that resists scratches, stains, and heat.

Some key advantages of quartz countertops:

  • Durable and long-lasting
  • Resistant to stains, scratches, and heat
  • Non-porous so doesn’t require sealing
  • Available in a wide range of colors and patterns
  • Requires minimal maintenance

Quartz is an ideal countertop material for busy kitchens and bathrooms. However, there may be times when you need to drill holes in your quartz countertop for installing fixtures or making modifications.

Can You Drill Into Quartz?

Yes, it is possible to drill holes in quartz countertops. With the proper tools and techniques, quartz can be drilled without cracking or chipping the material. Here are some important tips to keep in mind:

Use Diamond-tipped Bits

Standard twist drill bits will not work well on quartz. You need to use special diamond-tipped bits that are designed for drilling ceramic and stone. Diamond bits come in various sizes and shapes for different drilling needs.

Work Slowly with Low Speed

When drilling quartz, go slowly with a low drill speed. High speed can cause the material to crack oroverheat. Maintain a drill speed of 600-900 RPM when drilling quartz. Let the diamond bit do the work without applying too much pressure.

Use Backer Board Underneath

Place a sacrificial backer board, such as a piece of scrap wood, underneath where you are drilling. This prevents cracks from traveling down to the underside of the quartz. Make sure to keep the backer board stationary as you drill.

Drill with Water

Cooling the drill bit and quartz with water prevents overheating. Use a spray bottle or a container of water with a sponge to constantly lubricate the bit and hole during the drilling process. The water keeps the friction in check.

Check Your Countertop’s Warranty

Some quartz manufacturers prohibit or restrict drilling, so it’s important to check your warranty details first. Drilling holes incorrectly could void your warranty, so proceed with caution if drilling is not allowed.

Step-by-Step Guide to Drilling Holes in Quartz

Follow these key steps for successfully drilling holes in your quartz countertops:

1. Mark the Location

Use a marker or piece of tape to indicate where you want the hole. Check underneath to ensure you won’t be drilling into underlying structures or utilities.

2. Prepare Your Work Area

Clear your workspace and cover surrounding areas with a drop cloth. Have all your tools and materials ready – diamond bit, drill, backer board, water, rags etc.

3. Stabilize the Countertop Section

If you are drilling near an edge or seam, tape down the area to prevent movement or separation. Clamp down the backer board to keep it fixed in place.

4. Apply Water & Begin Drilling

Apply a constant stream of water to the quartz and diamond bit. Start drilling slowly at a 600-900 RPM speed. Let the drill do the work, no need to push down hard.

5. Frequently Remove Dust

Stop often to remove any quartz drilling dust with a wet rag or sponge. This also prevents overheating of the diamond bit.

6. Drill from Top Down

Once you break through the top, drill 50% into the thickness from the top. Then flip over and drill the rest from the underside to prevent blowout.

7. Smooth Edges & Clean Up

Use a file or sandpaper to smooth any rough edges around the hole. Remove all debris and clean the area when finished. Check for cracks underneath.

8. Install Fixtures as Needed

Once your hole is drilled, you can install inserts, soap dispensers, taps, brackets or other needed fixtures. Follow manufacturer instructions carefully.

FAQs About Drilling Into Quartz Countertops

Can I use a regular drill bit on quartz?

No, regular twist drill bits are not suitable for drilling quartz. You must use diamond-tipped drill bits.

How fast should I drill quartz?

Drill quartz slowly, between 600-900 RPM. High speeds can crack the material.

Is it OK to drill into quartz edges or seams?

Avoid drilling too close to edges or seams which are vulnerable areas. Stabilize these areas first before drilling.

What size diamond bit do I need?

Choose a diamond bit diameter slightly larger than what you need. A 1/4″ bit can drill a 1/8″ hole. Match bit shape to hole shape.

How can I smooth a rough drilled hole?

Use a file or fine grit sandpaper to smooth the circumference of the hole once drilled. Make sure to clean thoroughly afterwards.

How do I know if I’m damaging my drill bit?

Signs of a worn diamond drill bit include increased slipping, overheating, slow drilling, and blue discoloration of the quartz.


Drilling holes in quartz countertops is certainly doable with the proper precautions. Always use diamond-tipped bits, drill slowly, lubricate with water, and stabilize any vulnerable areas. Check your warranty details before drilling to avoid violations. Follow our step-by-step guide above to drill holes successfully without damaging your beautiful quartz countertop. With care and patience, you can modify and customize your quartz surface to suit your needs.