Can You Put Overmount Sinks on Quartz Countertops?

Installing an overmount sink on a quartz countertop is possible, but requires some special considerations. Here is a comprehensive guide on whether and how to install overmount sinks on quartz countertops.

What is an Overmount Sink?

An overmount sink, also known as a top-mount or drop-in sink, rests on top of the countertop. The rim of the sink extends slightly over the edges of the countertop cutout. Overmount sinks generally feature a decorative finished rim or lip that becomes an integral part of the countertop design.

Compared to undermount sinks which are installed from beneath the countertop, overmount sinks are typically easier to install as they simply drop into the pre-cut countertop opening. They also allow more flexibility in countertop material choices since the sink rim conceals the countertop edges.

Considerations for Quartz Countertops

Quartz has become a popular choice for modern countertops due to its durability, stain-resistance, and attractive appearance. However, there are a few considerations when pairing quartz with an overmount sink:

  • Seams – Quartz countertops are typically fabricated in sections that are seamed together. Overmount sink installation requires cutting out a section of the quartz for the sink. This means seams may be more visible around the sink area.
  • Heat – Quartz is resistant, but not immune to heat damage. Exposure to high temperatures from a hot pan, for example, could crack or discolor the areas around the sink cutout.
  • Staining – Quartz resists stains, but over time stains may build up along the seam between the sink and countertop if spills are not promptly cleaned.
  • Chipping – Cutting quartz is prone to chipping and cracking. Any impact near the sink edges could potentially cause chips or cracks over time.

Installing Overmount Sinks in Quartz

Installing an overmount sink in quartz counters is possible with careful planning and preparation:

  • Choose an experienced quartz fabricator to cut the sink opening. Precision cutting helps minimize seam visibility, chipping, and cracking.
  • Select a single bowl overmount sink to limit seams. A single seam in the back is less noticeable than multiple seams.
  • Coordinate sink and quartz colors to conceal seams. Contrasting colors emphasize the seams. Matching tones help seams blend in.
  • Smooth edges with diamond polishing pads. This eliminates sharp corners that could lead to cracking over time.
  • Apply a bead of silicone caulk between the sink and quartz. Caulking helps prevent leaks and stains.
  • Take care when using the sink to avoid chipping or cracking the quartz. Promptly clean spills and avoid exposing sides to excessive heat.

FAQs about Overmount Sinks on Quartz

Can you put any overmount sink on quartz?

You can install most overmount sink models on quartz countertops. Stainless steel, enamel, cast iron, and composite sinks are common overmount sink materials that will work. The key is proper installation and care.

Do you need to seal around an overmount sink on quartz?

Yes, you should always seal the seam between the sink and quartz countertop with a waterproof silicone caulk. This prevents moisture from penetrating the seam and causing damage.

What’s better for quartz countertops – undermount or overmount sinks?

Undermount sinks are generally better for quartz because they eliminate the visible seam and issues with sink rims putting pressure on the quartz edges. However, overmount sinks can work with careful installation and use.

Should you caulk around the entire overmount sink on quartz?

It’s recommended to apply a continuous bead of silicone caulk around the entire sink rim where it meets the quartz. Filling any gaps creates a water-tight seal.

How do you cut quartz for an overmount sink?

Cutting the sink opening in quartz should be done by an experienced professional fabricator using specialized tools like a circular saw with a diamond blade. Water cooling is used to minimize heat and cracks.


Installing an overmount sink in a quartz countertop is achievable with careful planning and preparation. To make it work, minimize seams, coordinate colors, polish edges, caulk thoroughly, and take care to prevent damage from impact or heat exposure. With the right approach, overmount sinks can be a stylish yet functional choice for quartz countertops. Working with an experienced installer is key to getting a seamless overmount sink integration with quartz counters.