How to Cut Granite Countertops

A kitchen with granite countertops.
  • 3-4 hours
  • Advanced
  • $110-250
What You'll Need
Standard household saw
Radial saw
Diamond cutting blade
Contour diamond blade
Granite slabs
Drop cloth
Carpenters pen
Safety glasses

Knowing how to cut granite is an essential skill if you are considering installing new counters. It is also one of the trickiest skills a DIYer can attain. Granite is generally very heavy and therefore may require more than one person to complete the job. Shaping granite requires diamond blades as other saw blades will not hold up to the task. These can be purchased at almost any hardware store, but they can be expensive. It is also wise to invest in collars for the blades to minimize vibration. This can mean the difference between a pristine cut and a disaster. When you are finished cutting the granite, you will have to polish it. By following these steps, you can cut granite yourself for your next kitchen remodel.

Step 1 - Prepare the Granite

When cutting granite, you need to know that more dust is generated during dry cutting. You should wear a mask to avoid breathing in too much dust, which can cause respiratory irritation. To keep granite particles out of your eyes, wear safety glasses as well. Use a hand-held radial saw with a vacuum attachment and a diamond cutting blade to reduce the amount of mess you have to clean up later. Lay a drop cloth down under the work area to make clean-up even more efficient.

Step 2 - Measure Carefully

Because of granite’s cost, measurements must be accurate. Mistakes can be expensive and discourage you from further work with granite. Make sure to include spaces for appliances as these are often flush with countertops.

When taking measurements, it may be wise to have some of the granite shaping done for you. Cutting granite to match things like sinks and putting curves in can be tricky. It might be worth the extra cost to have a professional do this part of the job to avoid having to replace a granite slab. Be sure to calculate delivery costs if you choose to go with this method as granite is very dense and heavy.

Step 3 - Cut

Carefully double check your measurements and begin the cutting process. If one of your marks becomes unreadable to you while using the saw, stop and redo the markings. The marks from the carpenter pen will guide you through the proper cuts with the saw. Also make sure you are wearing a mask and safety glasses while the saw is running. There will be a substantial amount of dust that can cause irritation.

When using your saw on the granite, it is recommended that you apply collars on each side of your blade. These act as washers and reduce vibrations during sawing. The reduction of vibrations will result in a cleaner cut.

Step 4 - Polish

Cut granite, no matter how carefully you have done it, will have rough edges. You should polish the edges very carefully. The high density of granite makes it hard to polish. You can polish the granite using an automated edge shaping machine.

If you have the patience and the skill, cutting granite yourself can save money and provide you with the satisfaction of having conquered the rock.