How to Install an Undermount Kitchen Sink – Easy to Follow Steps

installing an new undermount kitchen sink by replacing old one or renovating you kitchen

Searching for an easy-to-follow installation guide for your newly bought undermount sink? You have come to the right place.

Undermount sinks are mounted to the bottom of the countertop. This ultimately leads to the availability of more space on your work surface. These sinks provide a seamless finish to the entire kitchen look. The absence of any obstruction between the undermount sink and the countertop makes cleaning easy. You can easily swipe the food particles and dirt from your countertop into the sink without any mess. Undermount sinks work best with sturdy countertops such as stone, quartz or solid surface due to their heavy weight.

Recommended Reading: Best Kitchen Sinks to buy in 2021

Detailed procedure for installation of Undermount kitchen sink for your luxurious kitchen

Unlike drop-in sinks, these sinks do not have a rim; therefore, the installation of these sinks is different from the drop in versions. However, we have simplified the installation procedure for you. Please take a look at our installation guide for undermount kitchen sinks so that you can install your new undermount sink yourself.

To begin with the installation, make sure your countertop is modified enough for the new sink to fit in.


DIY Installation Procedure For Undermount Sink

An undermount sink can be installed using the following steps:

Tools and Material Required for Installing an undermount a kitchen sink:

  • Tape Measure
  • Utility Knife
  • Caulk Gun
  • Bar Clamp
  • Safety Glasses
  • Sand Paper
  • Undermount Sink
  • Silicone Sealant
  • 2-inch x 4-inch Dimensional Lumber
  • Mounting Hardware

Step 1: Take a picture of the plumbing assembly so that it may help you later (For reconnecting and reattaching all pipes). Now, turn off the water supply and disconnect all the plumbing pipes before removing the sink. Make sure to keep a bucket under the fixtures to collect any dripping water.
Turn off the garbage disposal and remove it.

removing the drain pipe from old kitchen sink for installing undermount kitchen sink

Step 2: Remove the existing undermount sink by unscrewing the metal clips and cutting through the silicone, that attaches the sink to the countertop. You can use a utility knife for this purpose.

Step 3: Prepare the countertop surface from both sides by removing any silicone residues left behind, with the help of a razor scraper. Be careful to avoid damaging the countertop surface.

Step 4: Now, clean the upper and lower side of the countertop, as well as the rim of the new sink, using mineral spirit or denatured alcohol.

Caution

Wear gloves while doing so

Step 5: Apply a bead of silicone sealant to the edge of the new sink, while placing the sink in the cabinet below the countertop cutout. Make sure to ask someone to guide you while placing the sink in the proper place from below.

Step 6: Place a 2 by 4 block on top of the sink. Place towels below each end of the block (on the countertop) to avoid scratching the countertop. Now, pass one end of the bar clamp through the drain hole of your sink.

undermount kitchen sink installation - support for new sink technique

Step 7: Place a 2 by 4 block on the underside of the sink to avoid damaging the sink from lower side. The block should be placed between the clamp and the sink. Hold the sink in place by tightening the clamp.

Step 8: Finally attach the mounting brackets.

Step 9: Clean any excess silicone left on the sink, using a damp cloth

Step 10: Remove the bar clamps 24 hours after installation of your undermount sink, so that the silicone sealant gets enough time to dry and seal the sink.

Step 11: Install the drain and re-attach the disconnected plumbing fixtures.

attach the pipes and drain after installing new undermount sink

Your new undermount sink is ready to use! Enjoy the sleek finish of your new sink!


We believe that the kitchen is the heart of a home, and the sink is its centerpiece. At Best Kitchen Sinks, our team of editors and writers put their maximum efforts into consolidating buying guides and reviews that are informative, unbiased, and helpful for homeowners in choosing the best kitchen sinks and other related products for their lovely kitchen! Alex Roy is the founder of best kitchen sinks. Being an expert in kitchen renovations, he believes in designing kitchens with the perfect sinks and other appliances to make kitchen tasks easy and free of mess. Alex Roy knows first-hand the challenges homeowners and business owners face when buying the best sinks and appliances for their kitchens. Besides the honest reviews on top kitchens sinks and filters, you will also find much information regarding kitchen sinks. From installation and plumbing to cleaning the kitchen sinks and troubleshooting any sink problem, our detailed and step-by-step guides will help you maintain your kitchen sink in the perfect shape at a minimal cost.

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