How to Cut Quartz Countertop for Cooktop

Installing a cooktop into a quartz countertop requires careful planning and execution to get a clean, professional result. Quartz is an extremely hard engineered stone that cannot be cut with standard power tools. However, with the right techniques and specialized diamond blades, you can achieve a perfect custom cutout. Here is a comprehensive guide on how to cut a quartz countertop for a cooktop installation.

Planning the Cutout Layout

The first step is to measure the dimensions of the cooktop and plan where you want it positioned on the countertop. Be sure to follow the manufacturer’s specifications for the cutout size. Quartz has very little tolerance for error so precision is key.

  • Allow a 1/8″ gap around the edges of the cooktop. This gap allows for expansion and prevents cracking.
  • Double check for alignment with the base cabinets below.
  • Mark the cut lines neatly with a pencil, allowing for the 1/8” spacing.
  • Ensure the cutout does not interfere with the support structure under the quartz.

Choosing the Right Cutting Tools

Cutting quartz requires diamond encrusted blades designed for this purpose. Standard wood or metal blades will become damaged very quickly. Here are the essential tools you will need:

  • A mini circular saw with a diamond grit quartz cutting blade. A 4-5” saw offers excellent control and visibility.
  • Straight edge guide – This helps guide the saw for straight lines.
  • Jigsaw with diamond grit blade – For curved or intricate cuts.
  • Hole saw drill bit – For boring any holes e.g. for fixtures.
  • Safety gear – respirator mask, ear protection, gloves and eye protection. Quartz dust is extremely fine.

Ensure your tools have ample diamond grit (at least 10/20 is recommended) and are designed for use on engineered stone. Follow all safety instructions provided with your equipment.

Cutting the Quartz

With your layout marked, tools ready, and safety gear on, you are ready to start cutting:

  1. Make rounded corners – Avoid sharp 90-degree angles. Use a carbide drill bit to drill 1” holes in the corners to facilitate a rounded finished look.
  2. Score the edges – Use the circular saw outfitted with a diamond grit blade to score along the cut lines. Take it slow to keep the line straight. Score 1/8” deep.
  3. Make the cutout – With lines scored, go back with the circular saw and continue cutting at full depth. For straight lines use a guide for accuracy. Use a jigsaw for curved cuts. Apply steady, even pressure allowing the blade to do the work.
  4. Clean up – Use a handheld diamond file stone to smooth any small irregularities on the cut edges. Vacuum all dust.

Install the Cooktop

With the custom cutout complete, you can now install the cooktop:

  • Clear all dust from the cutout using a vacuum. Wipe clean with a damp cloth.
  • Apply a silicone sealant around the edges of the cutout. This creates a water tight seal when the cooktop is installed.
  • Carefully place the cooktop into the cutout. The 1/8” gap should allow it to fit smoothly.
  • From under the counter, secure the cooktop in place per the manufacturer’s instructions. Most use mounting brackets.
  • Allow the silicone to fully cure for 24 hours before use.

And that’s it! With a measure twice, cut once approach, and the proper quartz cutting tools, you can achieve a seamless custom cooktop installation in your quartz countertop.


How deep should the cutout be for a cooktop?

The depth of the cutout depends on the dimensions specified by the cooktop manufacturer, but is typically around 1 1/2 inches. This allows room for supply lines and ventilation under the unit.

Can you cut quartz countertops with a circular saw?

Yes, but only if it has a high quality diamond grit blade designed for cutting engineered stone. Standard circular saw blades will be damaged by quartz.

What speed should I cut quartz at?

Cut at a slow, steady pace allowing the diamond blade to work without overheating. Typical cutting speed is 8 to 10 inches per minute. Too fast can cause cracks.

Should I wet cut quartz?

Wet cutting is not required, but does help minimize dust. If wet cutting, be sure to dry the area thoroughly before installing the cooktop to prevent water damage.

Is it cheaper to fabricate quartz before or after installation?

Fabrication is generally less expensive when done before installation. This allows for more workspace and flexibility in the fabrication shop versus an installed countertop.

Can any quartz be used for a cooktop installation?

Consult your quartz supplier. Not all thicknesses and aggregates have the strength required. 3cm material with metal reinforcement is best for cooktop cutouts.

Is it better to cut quartz before or after securing it to the cabinets?

It is best practice to fabricate the countertop fully including any cutouts prior to installation. This prevents movement and cracking.


Installing a cooktop into quartz counters is very doable with specialized diamond cutting tools, precision measurements, and proper technique. The key things to remember are:

  • Allow a 1/8” gap around your cutout size
  • Use diamond grit blades and drill bits made for engineered stone
  • Cut slowly and methodically for clean results
  • Smooth edges and thoroughly clean dust before installing the cooktop
  • Seal edges with silicone caulk prior to setting the cooktop

With attention to detail, you can achieve a safe, seamless integration of your cooktop into a beautiful quartz work surface.