How To Install An Undermount Sink On A Granite Countertop

Installing an undermount sink on a granite countertop can be a tricky task. However, with the right tools and some basic knowledge of plumbing, you can easily do it yourself.

This article will give you all the information you need to get started, including what materials you’ll need and how to prep your countertop. Read on to find out more!

Installing an undermount sink on a granite countertop can be a tricky task. However, with the right tools and some basic knowledge of plumbing, you can easily do it yourself.

This article will give you all the information you need to get started, including what materials you’ll need and how to prep your countertop. Read on to find out more!

Setting up an undermount sink is simpler than it may seem at first glance. You just have to follow the steps carefully and make sure that everything is properly fitted together.

Gather The Necessary Materials

Before installing an undermount sink on a granite countertop, you must have the right materials. Start by gathering up the sink, silicone caulk, mounting clips, adhesive epoxy, a utility knife, and a drill with drill bits. You’ll also need a four-inch hole saw for cutting out the hole in the granite. It’s important to double check that you’ve got all of these materials before starting.

In addition to these tools and materials, make sure to have gloves and safety glasses handy. Wear them throughout the installation process for extra protection. Make sure to also read through all the instructions before getting started so that you understand each step of the process properly.

Preparing Your Countertop

Installing an undermount sink on a granite countertop is a big job, but it can be done with the right tools and materials. Before you begin, you’ll need to prepare your countertop for the process

. To start, measure the area of your sink cutout accurately with a tape measure and draw a line around it with a pencil. Next, use a hammer and chisel to create a groove along your marked line.

Carefully chip away at the granite until you achieve the desired depth of one inch; when finished, use sandpaper to smooth out any rough edges.

Finally, clean off any dust or debris before continuing with the installation.

Mounting The Sink

To begin, make sure you have the right-sized hole cut into the countertop before attempting to install the sink. Once that’s done, you can start by attaching mounting clips or screws onto the underside of the countertop around the hole.

Then place a bead of silicone sealant around the hole before inserting the sink into position and securing it with more mounting clips or screws.

Finally, apply more silicone sealant around the edges of the sink and wipe away any excess with a damp cloth. With those steps complete, you’ll be able to enjoy your new and improved countertop setup!

Connecting The Water Supply

Begin installation of the undermount sink by connecting the water supply. Assemble the components necessary for this step, such as flexible braided supply lines and shut-off valves. Attach one end of each supply line to the respective shut-off valve, then attach the other end to the fixture inlet on the underside of the sink.

Make sure all connections are secure and there are no leaks. Once this is done, turn on both valves and check for any leaks around all of your connections. If everything looks good, you can now mount your sink to the granite countertop.

Mark holes that match up with mounting clips or brackets on the underside of your sink with a marker or pen, then drill pilot holes into the granite using a diamond tipped masonry bit.

Securely attach mounting clips or brackets to those holes and slide your sink into place – it should fit snugly against the granite countertop.

Finally, use caulk or an adhesive sealant to fill any gaps between your sink and countertop and allow it to fully dry before using it again.

Finishing Touches

Now that the water supply is connected, it’s time to start putting the sink in place. Start by lifting the sink into place and pressing it firmly against the countertop. If necessary, use a level to make sure it’s even.

To secure the sink, apply silicone caulk under the lip of the sink and then press it firmly into place. Make sure to check for any gaps or unevenness and adjust accordingly.

Once everything is in place, you can finish up with some final touches like wiping away any excess caulk or adding any decorative items you may have chosen.

With all these steps complete, your undermount sink should be securely installed on your granite countertop!

Frequently Asked Questions

How Much Does An Undermount Sink Typically Cost?

The cost of an undermount sink can vary widely, depending on the type and size you are looking for. Generally speaking, you can expect to pay anywhere from $50 to $500 or more for a new sink.

However, higher-end materials such as granite or marble will cost significantly more than a standard stainless steel sink.

Ultimately, your budget should determine how much you are willing to spend on an undermount sink.

How Do I Know What Size Sink To Buy For My Countertop?

When deciding which size sink to buy for your countertop, it’s important to take into account the measurements of your existing countertop. Measure the width, depth and length of the existing countertop area you want to install the new sink in.

Then, make sure the undermount sink you purchase is slightly smaller than the measurements you have taken to ensure that it fits properly and won’t stick out over the edge of your countertop.

Additionally, consider how wide and deep you want your sink to be. Keep in mind that a deeper basin will give you more flexibility when it comes to washing dishes and other tasks.

How Long Does It Usually Take To Install An Undermount Sink?

Installing an undermount sink can be a tricky task, but generally it shouldn’t take too long. On average, one should expect the installation to take around 1-2 hours depending on the complexity of the project.

If everything goes according to plan, it’s possible to get the job done in as little as 30 minutes.

Of course, if you’re unfamiliar with how to install an undermount sink and are working with a granite countertop, you may want to hire a professional for the job to ensure that everything is done correctly and safely.

What Type Of Sealant Should I Use To Secure The Sink To The Countertop?

When it comes to securing an undermount sink to a granite countertop, there’s no one-size-fits-all solution. The type of sealant you should use will depend largely on the materials used for your sink and countertop, as well as the conditions in which they are installed.

For example, if you’re working with porcelain or stone, silicone caulking is recommended; however, for stainless steel sinks and granite countertops, an epoxy adhesive is best.

It’s important to follow the manufacturer’s instructions when selecting a sealant and applying it to ensure a secure fit.

Is It Possible To Install An Undermount Sink On A Laminate Countertop?

It is possible to install an undermount sink on a laminate countertop; however, it’s not recommended because it can be difficult to secure properly. You’ll need to use a high-strength adhesive to attach the sink and make sure it is completely sealed, as any water leakage can cause damage.

Additionally, you should use additional supports where needed to ensure a strong and secure fit.


Installing an undermount sink on a granite countertop is not a difficult task. It’s important to know the size of your sink, as well as the type of sealant you’ll need before getting started. The cost can vary, but it’s usually quite affordable and installation shouldn’t take more than a few hours.

While this project may seem daunting, anyone with basic DIY skills should be able to complete it with ease. Just remember to take your time and follow the steps carefully, and you’ll have a beautiful new sink in no time!


  • vikram-2-1 How To Install An Undermount Sink On A Granite Countertop

    My name is Vikram and I have a genuine passion for plumbing and faucets. I've spent countless hours researching and experimenting with different techniques and products to find the most effective solutions for common plumbing problems. My goal is to share my knowledge and experience with homeowners, so they can save time, money, and stress by tackling plumbing issues themselves.

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