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Install undermount sink in granite countertop

  • Difficulty: hammer
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    Beginner Do-It-Yourselfer - Easy
    Intermediate Do-It-Yourselfer - Moderate
    Experienced Do-It-Yourselfer - Difficult
    Professional - Expert

Fitting an undermount kitchen sink in a granite or stone countertop is a project that can be done yourself, although certain precautions must be taken due to the weight of the materials. The sink is supported from below by mounting clips glued under the counter.

This structure is strong enough to support the weight of the sink when filled with water. An undermount sink is as handsome as it is practical; the countertop is easier to clean and no residue can accumulate under the sink edge. An undermount sink is more complicated to install than a drop-in sink. Follow the steps carefully, and if in doubt, call a professional installer.


Tools and materials required

Your kitchen transformation starts with a good plan. Download our planning guide and leave nothing to chance.


  • Set of clamps of a suitable length
  • Utility knife (with new blade)
  • Scriber


  • Piece of 2" x 4", longer than the width of the sink
  • Solvent, such as denatured alcohol, to clean the surface
  • Transparent silicone sealant
  • Epoxy resin adhesive for granite or natural stone
  • 80-grit sandpaper

Before Assembly



While it is possible to install an undermount kitchen sink yourself, we suggest you call on professional help from installation experts if you are in any doubt. Undermount installation techniques depend on the type of counter and sink. The materials can be heavy and cumbersome. Finally, manufacturers' products and accessories may involve techniques that are different from those presented here. For more information, refer to the supplier installation manuals.

First, ask a professional to cut the sink hole in the counter; a template is provided with the sink. Instructions for this procedure are not included in this guide.

Items such as the strainer, the cutting template and the hardware required for undermount installation are usually provided with the sink. You will nevertheless need all the above-listed tools and materials in order to install the sink professionally.


Granite and stone countertops are very heavy. The sink needs to be fitted under the counter once the counter is in place on the cabinets. This involves working inside the cabinets under the countertop, which makes the task a little more complicated.

For the adhesive to bond properly, the granite countertop must be dry and have been at room temperature for at least four hours.
With an enamelled cast-iron sink, which is heavier than other sinks, holes must be drilled in the granite, about ½" deep. The anchors are then screwed into the holes.


Wear safety glasses and protective gloves when working under the counter.

Turn off the water supply.


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