How to Cut Prefab Quartz Countertop

Measuring and Marking the Cut Lines

The first step is to precisely measure and mark where you need to make the cuts. Here are some tips for this:

  • Use a tape measure and straight edge to measure and mark your cut lines. Make sure the lines are straight.
  • Mark the lines clearly using a pencil or sharp marker so you can see them when cutting.
  • Double check all your measurements to make sure they are accurate before cutting. An imperfect cut cannot be fixed.
  • Mark the front and back of the countertop to ensure straight even cuts.
  • If cutting for a sink or appliance, measure and mark based on the specifications of the sink or appliance.
  • Account for the thickness of the blade when marking the lines to avoid taking off too much quartz.

Gathering the Right Cutting Tools

Having the proper cutting tools is imperative for making clean cuts in your quartz countertop:

  • A diamond-bladed angle grinder is ideal for cutting quartz. The diamond blade is durable enough to cut through the stone.
  • A circular saw with a diamond blade can also work but may create more dust and debris.
  • Use a quartz-specific blade to avoid chipping or cracking the material.
  • Have a corded power tool to ensure consistent power when cutting.
  • Safety gear like eye protection, ear protection, gloves and a dust mask are a must.

Cutting the Quartz Countertop

With your lines marked and tools ready, it’s time to cut the quartz:

  • Clear the area of any objects that could interfere with cutting. Cover the floor to catch dust.
  • Put on all your safety gear – this is crucial when cutting stone!
  • Make sure your quartz is fully supported on a sturdy surface like sawhorses before cutting.
  • Make several shallow passes along the cut line rather than one deep cut. Apply light but consistent pressure.
  • Cut slowly and smoothly for the cleanest edge. Rushing can crack or chip the quartz.
  • Make sure to cut fully through the thickness of the slab.
  • Expect the blade and quartz to get hot. Take breaks to allow cooling if needed.
  • Once cut, inspect the edge for any imperfections and smooth them carefully with sandpaper.

Finishing the Cut Edge

The final step is finishing off the freshly cut edge:

  • Carefully sand the cut edge using increasingly finer grit sandpaper until smooth.
  • Clean off all dust from sanding using water and a microfiber cloth.
  • Apply sealant to the exposed edge to prevent moisture intrusion and staining.
  • Inspect the final cut edge and ensure there are no remaining cracks, chips or rough spots.
  • If cutting for a sink, carefully polish the cutout area with sandpaper and sealant to prep for sink installation.

And that’s it! With the right prep and tools, you can achieve perfect cuts in your prefab quartz countertop. Just remember to always focus on precision and safety when working with quartz. Patience and care will pay off with smooth edges and a tailored fit.

Frequently Asked Questions About Cutting Prefab Quartz Countertops

Can I cut quartz countertop with a circular saw?

Yes, you can cut quartz countertop with a circular saw as long as you use the proper blade. Use a diamond or granite blade specifically designed for cutting stone materials. This will help minimize chipping. Go slowly to avoid cracking.

What is the best saw to cut quartz?

An angle grinder with a diamond blade is ideal as it gives you the control and precision needed for cuts. A circular saw with a diamond blade can work as well. Ensure the saw is powerful enough to handle cutting through quartz.

How do you cut holes in quartz countertops?

Use a hole saw drill bit specifically for stone. Mark the hole location. Drill slowly to avoid cracking. Start with a smaller pilot hole before using larger hole saw sizes. File the cut edge smooth.

Can you cut quartz countertop with scissors?

No, quartz cannot be cut with regular scissors. You need specialized stone cutting tools like an angle grinder or circular saw with a diamond blade. Scissors are not strong enough to cut through solid quartz.

What should you not cut on quartz?

Avoid cutting directly on the surface of your installed quartz countertop. Always use a cutting board. Quartz can dull your knives faster than wood. Metal knives can also scratch, chip or stain the quartz surface.

How do you polish a quartz countertop edge?

Use increasingly finer grits of wet/dry sandpaper to polish the edges. Start with 60 grit and work up to 3000+ grit for a smooth polished finish. Rinse regularly and check smoothness. Finish with a quartz polish and soft cloth.


Cutting a prefab quartz countertop is an achievable DIY project with the right tools and preparation. Always measure carefully, use specialized diamond blades, work slowly, and focus on safety. Finishing the cut edges smoothly ensures your countertop looks professionally installed and protects your investment. With some patience and technique, you can expertly cut your quartz countertop to fit your unique space.