How to Replace Undermount Sink

How to Replace an Undermount Sink: A Step-by-Step Guide

An undermount sink can be a beautiful addition to any kitchen or bathroom, providing a sleek and modern look while also maximizing countertop space. However, there may come a time when you need to replace your undermount sink due to damage or simply to update your space. If you are considering replacing your undermount sink, this step-by-step guide will walk you through the process.

Step 1: Gather Your Tools and Materials
Before you begin, make sure you have all the necessary tools and materials. You will need a wrench, screwdriver, plumber’s putty, a utility knife, a new undermount sink, and any necessary hardware or mounting brackets.

Step 2: Turn Off the Water Supply
To prevent any accidents or leaks, turn off the water supply to your sink. This can usually be done by turning off the water valves located under the sink.

Step 3: Disconnect the Plumbing
Using your wrench or pliers, disconnect the plumbing connections to the sink. This may include the drain pipe, P-trap, and any other connections. Be sure to have a bucket or towel nearby to catch any water that may spill.

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Step 4: Remove the Sink Clips or Brackets
Undermount sinks are typically secured to the countertop with clips or brackets. Use a screwdriver or drill to remove these clips or brackets, taking care not to damage the countertop.

Step 5: Cut the Sealant
Using a utility knife, carefully cut through the sealant that is holding the sink to the countertop. Take your time to ensure a clean cut and avoid any damage to the countertop.

Step 6: Lift and Remove the Old Sink
With the sealant cut, gently lift the old sink out of the countertop. Be cautious of the weight and have someone assist you if needed. Set the old sink aside or dispose of it properly.

Step 7: Prepare the New Sink
Before installing the new sink, clean the area where the old sink was located. Remove any remaining sealant or debris and ensure the area is dry and clean.

Step 8: Apply Plumber’s Putty
Apply plumber’s putty around the edge of the sink’s lip. This will create a watertight seal when the sink is installed.

Step 9: Install the New Sink
Carefully place the new sink into the countertop cutout, ensuring it fits snugly. Press down firmly to secure the sink in place.

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Step 10: Secure the Sink
Using the provided clips or brackets, secure the sink to the underside of the countertop. Follow the manufacturer’s instructions for proper installation.

Step 11: Reconnect the Plumbing
Reconnect the plumbing connections to the sink, including the drain pipe, P-trap, and any other connections. Tighten them securely to prevent leaks.

Step 12: Turn On the Water Supply
Once everything is securely connected, turn on the water supply and check for any leaks. If there are no leaks, congratulations! You have successfully replaced your undermount sink.


1. How long does it take to replace an undermount sink?
The time it takes to replace an undermount sink depends on your level of experience and the complexity of the job. On average, it can take anywhere from 1 to 3 hours.

2. Can I reuse my old sink clips or brackets?
It is recommended to use new sink clips or brackets when replacing an undermount sink. This ensures a secure and proper installation.

3. Do I need to hire a professional to replace my undermount sink?
While it is possible to replace an undermount sink yourself, it may be beneficial to hire a professional, especially if you are unsure of your plumbing or carpentry skills.

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4. Can I replace my undermount sink without removing the countertop?
In most cases, the countertop does not need to be removed to replace an undermount sink. However, if there is extensive damage or the countertop needs to be replaced, it may be necessary to remove it.

5. How often should an undermount sink be replaced?
Undermount sinks are durable and can last for many years. However, if you notice significant damage or wear and tear, it may be time to replace your sink.

6. Can I install an undermount sink on my own?
Yes, with the right tools and materials, it is possible to install an undermount sink on your own. However, it is important to follow proper installation procedures and take necessary precautions.

7. Can I replace my undermount sink with a different size or style?
Yes, you can replace your undermount sink with a different size or style as long as it fits the existing countertop cutout and plumbing connections are compatible.

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