Bathtime just got a bit of a challenge? An undermount bathroom sink, while sleek and stylish, can pose a real hassle when it’s time for replacement or removal. Fear not, we’re here to guide you through this task, step by step. Let’s dive in and tackle this DIY project together.
The first step is to gather your tools. You’ll need a putty knife, chisel, screwdriver, adjustable wrench, and some safety glasses to protect those peepers. Once you’re all geared up, it’s time to let’s get started.

Preparation: Tools and Setup
A well-prepared workspace is the key to success. First, lay down drop cloths to protect your floor. Then, turn off your water supply at the valves under the sink. If your pipes don’t have valves, you’ll need to shut off the main water supply to your home. Don’t forget to turn off the drain too, plug it with a rag to prevent any nasty surprises.
With your tools and workspace ready, let’s move on to the big question – how to remove that undermount sink without causing chaos in your bathroom.
Removing the Sink
First, unscrew the mounting clips. These are usually located on the sides or bottom of the cabinet. Wiggle the sink gently to see if it will lift out. If not, you might have to remove the Cabinet’s bottom face frame to access more clips.
Once the clips are off, use a putty knife to pry the sink from the countertop. Apply gentle and steady pressure, moving around the sink. If it’s stubborn, you might need to use a chisel or a wooden block to avoid damaging the countertop. With a bit of patience and care, the sink should eventually lift off.

Removing the Sink Drain and Pipes
Next, disconnect the drain pipe and the water supply lines. Use an adjustable wrench to loosen the nuts that hold them in place. Be cautious not to damage the pipes. If you have a pop-up drain, you’ll need to remove the pop-up mechanism before removing the dripping loop.
Once you’ve disconnected everything, your old undermount sink is finally ready to be taken out. If you’re planning to reuse it, be sure to wrap it carefully in a blanket or moving blanket to prevent any damage during transportation. Now, let’s discuss your new sink’s installation.
Installing the New Undermount Sink
Before you install your new sink, ensure it’s the right size and type for your countertop. A new undermount sink usually comes with a template that matches the existing hole. If not, you might need to trace the outline of the old sink onto the new one before cutting the opening.

With your new sink ready, it’s time to install it. First, apply silicone caulk around the edges of the sink. This will create a waterproof seal. Then, slowly lower the sink into the hole, using the silicone to guide it into place.
Securing the Sink
Once the sink is positioned correctly, you can start securing it. Line up the mounting clips with the corresponding holes in the sink. If the clips are missing or damaged, you might need to order new ones. Use a screwdriver to tighten the clips, ensuring they’re secure but not too tight – you don’t want to crack the countertop.
With the sink secured, it’s time to reconnect your water supply and drain. Tighten the nuts with an adjustable wrench, being careful not to overtighten them. If you have a pop-up drain, reinstall the pop-up mechanism and connect it to the lever or rod.
Finishing Touches
Finally, turn on your water supply and check for any leaks. If everything is dry, your new undermount sink is ready for use. Don’t forget to clean up your workspace and put away your tools before you call it a day.

And there you have it! From removing an old undermount sink to installing a new one, we’ve tackled this DIY project together. All that’s left now is for you to enjoy your snazzy new sink and admire your handiwork. Happy bathtime!







