How to Trim a Quartz Countertop

Quartz countertops are popular in many homes due to their durability, aesthetic appeal, and low maintenance requirements. However, sometimes a quartz countertop may need to be trimmed to fit properly in your kitchen or bathroom. Trimming a quartz countertop is not extremely difficult, but does require some special tools and safety precautions. Follow this step-by-step guide to successfully trim your quartz countertop.

Gather the Necessary Materials

Trimming a quartz countertop requires having the right tools and supplies on hand. Here is a list of what you’ll need:

  • Quartz countertop to be trimmed
  • Tape measure
  • Straightedge or square
  • Marker or pencil
  • Electric circular saw with diamond blade
  • Eye protection
  • Ear protection
  • Dust mask
  • Gloves
  • Clamps
  • Shop vacuum

Be sure to use a circular saw that is designed to cut stone and has a diamond blade. A standard wood cutting blade won’t work. You’ll also need safety gear like glasses, gloves, and a dust mask since cutting quartz produces a fine powder.

Measure and Mark the Cut Lines

First, carefully measure where you need to trim the quartz countertop and mark cutting lines with a pencil or marker. Use a straightedge as a guide when drawing your cut lines to ensure they are straight.

Be very precise with your measurements, as you can’t glue pieces back on after cutting quartz. Double check all measurements before making any cuts.

It’s also a good idea to mark the underside of the countertop where you’ll be cutting to transfer the cutting lines. This helps provide visibility when you flip the countertop over to cut.

Set Up a Secure Work Station

Cutting a quartz countertop requires securing it tightly so it doesn’t move or vibrate during the cutting process. Here are some tips for setting up a safe work station:

  • Use saw horses or a sturdy work table that allows the countertop to overhang the edges.
  • Clamp down the countertop securely to the work surface.
  • Have an assistant help hold the countertop steady if needed.
  • Make sure the saw horses or table are on a flat, stable, vibration-free surface.
  • Use extra braces or clamps on the part of the countertop that will be cut off to prevent unwanted movement.

Taking the time to properly secure the countertop will result in a clean, accurate cut.

Make Several Light Passes with the Saw

Once your quartz countertop is firmly braced and marked, you’re ready to start cutting. When using a circular saw, don’t try to cut all the way through the thickness of the quartz in one pass.

Instead, make several light passes, lowering the blade slightly each time until you cut through the entire depth. Taking light passes reduces the risk of cracking the quartz or jarring it out of position.

Move the saw slowly and smoothly along the cut line. Forcing it or moving too quickly can ruin the cut. Be sure to have your saw blade spinning at maximum cutting speed before starting.

Clean Up the Cut Edge

After you make the full cut through the quartz with the circular saw, inspect the cut edge. It’s likely to have some roughness or unevenness.

Use a handheld diamond polishing pad to polish and smooth the cut edge of the countertop. Take your time and be thorough to achieve a nice finished edge.

Avoid using a dry diamond polishing pad, as this creates too much heat on quartz. Instead, use a pad designed for wet polishing and keep the edge lubricated with water.

Safely Finish the Job

Once the countertop has been cut and polished, follow these final steps:

  • Carefully clean up any debris, dust, or powder generated from cutting using a shop vacuum. Quartz powder can scratch finished surfaces.
  • Remove any clamps and braces used to secure the countertop during cutting.
  • Lift and install the countertop in its final position. Have an assistant help maneuver the heavy piece.
  • Make any final adjustments to achieve a perfect overhang into the room.
  • Finish by sealing the cut edge with a clear adhesive caulk. This prevents moisture from getting inside and causing damage.

And that’s it! With these steps, you can achieve a professional-looking trimmed quartz countertop installed neatly in your home.

FAQs About Trimming Quartz Countertops

What tools do I need to trim a quartz countertop?

You’ll need an electric circular saw with a diamond blade, tape measure, straightedge, clamps, eye protection, dust mask, and diamond polishing pads. Avoid using a standard woodcutting blade.

How thick are most quartz countertops?

Quartz countertops are typically 1 1/4 inches thick. Some specialty versions may be 1/2 inch thicker or thinner. Measure yours to know the depth you’ll be cutting.

Can I make curved or angled cuts in quartz?

It’s best to only make straight 90-degree cuts in a quartz countertop. Curved or angled cuts are very difficult and require special wet cutting tools.

What speed should I cut quartz at?

Cut slowly to avoid cracking, chipping, or breaking the quartz. Make several light passes when cutting all the way through the thickness. Keep the saw blade spinning at max cutting RPM.

Can I cut quartz countertop outside?

You can, provided you securely brace the countertop and control dust. Cutting outdoors is easier for cleanup. Avoid windy conditions that can blow quartz dust around.

How do I cut an opening or hole in a quartz countertop?

Use a quartz fabrication shop. Cutting sink holes or openings for appliances requires special diamond hole saw drill bits and experience. This is not a DIY job.

Does quartz need to be sealed after cutting?

Yes, apply a clear caulking to the cut edges to prevent moisture intrusion that can damage quartz. Let the caulk fully cure before using the countertop.

Can I cut quartz with a handheld angle grinder?

It’s not recommended. Angle grinders generate a lot of destructive heat. Use a circular saw with a diamond blade and water for cooling instead.

How dangerous is the dust from cutting quartz?

Quartz dust is a lung irritant and carcinogen. Always wear an N95 dust mask and ventilate the area. Never dry cut quartz as the dust is greatly increased.

Is it hard to cut a quartz countertop straight?

Use a circular saw guide, square, and clamps to ensure straight cuts. Mark lines on the bottom side too. Take your time and don’t force or rush the saw.


Trimming a quartz countertop allows you to achieve a perfect custom fit for your kitchen or bath. With the proper tools, safety gear, and techniques, it is a project a home DIYer can successfully complete. Always work slowly and carefully when cutting. A perfectly trimmed quartz countertop will upgrade your room’s aesthetics for years to come.