How to Cut Quartz Countertop in Place

Installing a quartz countertop can transform the look of your kitchen or bathroom. Quartz is an engineered stone that is very strong, making it an ideal choice for countertops. Cutting a quartz countertop in place allows for a custom fit without having to remove the entire countertop. With some planning and the right tools, you can cut your quartz countertop in place for that perfect fit.

Determine the Location for the Cut

Before cutting, you’ll need to decide where you want to make the cut. Here are some common reasons for cutting a quartz countertop in place:

  • To fit around pipes or electrical outlets
  • To shorten the length or width for a custom fit
  • To open up space for sinks or cooktops
  • To create seams between countertop slabs

Carefully measure and mark the exact position for the cut line using a pencil. Ensure the line is straight using a ruler or straightedge. Plan the cut line to avoid joints in the countertop if possible.

Gather the Proper Cutting Tools

Cutting quartz requires diamond blades designed for this hard material. Here are the tools you’ll need:

  • Circular saw with diamond blade
  • Jigsaw with diamond blade
  • Angle grinder with diamond blade
  • Water for cooling diamond blades
  • Eye and ear protection
  • Respirator mask

A circular saw is ideal for straight cuts while a jigsaw can handle curved and irregular cuts. An angle grinder is useful for notching tight corners. Make sure to have spare blades on hand.

Set Up Safety Supports

Supporting the cut area is crucial when cutting in place to prevent cracking or breaking. Here are two options:

Bridging support: Place a rigid board underneath to bridge the cut area. Clamp temporary braces on the countertop to support the bridging board.

Layered support: Build up layers under the cut line using scrap wood or rigid foam. This supports the cut edge after it’s separated.

Take your time preparing stable, layered support for the best results.

Make the Cut

With your cut line marked and supports in place, you’re ready to make the cut:

  • Run water over the blade to keep it cool during cutting.
  • Make several shallow passes rather than one deep cut. Allow the blade time to cut through the thickness.
  • For curved cuts, drill a starting hole first. Insert the jigsaw blade into the hole to start the curve.
  • Work slowly and steadily for best control. Quartz has a tendency to chip.
  • Continue water cooling of the blade to prevent overheating, which can damage the quartz.
  • Cut just inside your marked line to ensure a straight edge. You can sand or grind later for a precise fit.

Smooth and Polish the Cut Edge

The cut edge will be rough and require smoothing and polishing:

  • Use a handheld sander or angle grinder to finely smooth the cut edge.
  • Finish with increasingly finer grit sandpaper, up to 3000-5000 grit for a polished look.
  • Wet sanding is recommended to prevent breathing quartz dust. Wipe the edge clean between sanding.
  • For brilliant shine, polish the edge with quartz-specific compounds using a low speed buffer.

Take your time with smoothing for a flawless cut edge that matches the factory finish.

Seal and Care for the Cut Edge

The porous cut edge needs to be sealed to prevent damage:

  • Use penetrating sealers made specifically for quartz countertops. Multiple applications may be needed.
  • Reseal the cut edge every 1-2 years as part of routine countertop maintenance.
  • Avoid placing hot pots or pans directly on seam to prevent cracking over time. Use trivets.
  • Clean with a mild soap and soft cloth. Avoid abrasive cleaners.
  • Inspect the cut edge periodically for any cracks or chipping. Reseal as needed.

Proper sealing and care will help your custom cut quartz countertop last for many years.

Frequently Asked Questions

What tools do I need to cut a quartz countertop?

You’ll need a circular saw or jigsaw with a diamond blade made for cutting quartz. A diamond blade angle grinder can also be helpful. Be sure to use water to keep the blades cool.

Can I cut quartz countertop with a wet saw?

Wet saws are not generally recommended for quartz because the water stream can damage the material. Stick to circular saws, jigsaws or angle grinders with diamond blades instead.

What happens if the quartz cracks during cutting?

Stop cutting and thoroughly inspect the crack. If it’s just in the cut area, you may be able to continue cutting past it carefully and then polish out the damaged section. Deep cracks traveling back into the slab will require professional repair.

How smooth can I get the cut edge?

With fine grit sandpaper and quartz polishing compounds, you can get the cut edge nearly as smooth and shiny as the factory finish. Taking your time with sanding and polishing is key.

How do I get a precise cut line for the best fit?

Cut just inside your marked line, then use an angle grinder to grind the edge to your exact line. Sand and polish when done grinding for a perfect custom fit.


Cutting a quartz countertop in place takes patience and the right techniques, but it allows you to achieve a truly custom fit. With the proper tools, safety supports, and finishing work, you can get professional-looking results. Pay close attention during cutting, go slow, and keep blades cool. And don’t forget to seal the porous cut edge when complete to protect your investment. With some care, your custom-cut quartz countertop will last for many years, transforming your space beautifully.