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Install undermount sink solid-surface count

  • Difficulty Level: hammer
    Close Difficulty Levels
    Beginner Do-It-Yourselfer - Easy
    Intermediate Do-It-Yourselfer - Moderate
    Experienced Do-It-Yourselfer - Difficult
    Professional - Expert
  • Cost Level:
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    Cost comparable to current options
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  • Completion Time : Week-end Project

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.

This type of undermount installation involves a specific technique and a sink designed especially for this purpose, often available by special order only.

The sink is supported from below with special mounting clips glued under the countertop. This structure is strong enough to support the weight of the sink when filled with water.

An undermount sink is more complicated to install than a drop-in sink. Follow these steps and the manufacturer's instructions 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
  • Hot melt glue (hot glue gun)


  • Solvent, such as denatured alcohol, to clean the surface
  • Transparent silicone sealant
  • Seam adhesive for solid and synthetic surfaces
  • 80-grit sandpaper
  • 4 guide blocks
  • 8 small stop blocks of 2" x 2" made from ½" plywood
  • Cellophane

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 different from those presented in this guide. 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.

If you choose a granite sink, which is very heavy, you must first strengthen the solid surface with ½" plywood installed under the counter. This step is not necessary if you have a stainless steel sink or a sink made of a lighter material than granite.

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.


This guide provides instructions on installing an undermount sink, assuming that the plumbing under the counter is in place and ready to connect up. Solid-surface countertops are not particularly heavy. This means that the countertop can be turned over to install the sink, giving you more room for manoeuvre, and then flipped back over again once the sink is in place, in order to position it on the cabinets.


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

Turn off the water supply.


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RONA Langdon Hardware Ltd. / Fort Erie

1238 Dominion Road, Fort Erie,
Ontario, L2A 1H7

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