Undermount Bathroom Sinks

About Undermount Lavatory Sinks

For a modern option, choose one of our undermount bathroom sinks for your bathroom update. They're not the easiest to install, and they require better handiwork in cutting out the countertop, but they look amazing!

If you need a different bathroom sink type, we have all kinds, but if you are looking for an undermount bathroom sink, then you have come to the right place. Pair your new fixture with one of the hundreds of discount options for lavatory faucets. Keep in mind that you don't want your sink to clash with your toilet.

What Are Undermount Sinks?

Also referred to as bottom-mount, undermount bathroom sinks are trendy today because of the growing popularity of solid surface countertops in homes. Solid surface counters consist of stone, granite, quartz, marble, concrete, etc. When a solid surface countertop is installed, in many cases an undermount unit accompanies it. Undermount sinks are mounted underneath the counter with a custom cut hole. You will never see the rim since it's obscured beneath the counter. This feature is ideal for high-traffic bathroom areas for reasons that will soon become apparent.

Benefits of Undermount Sinks

Not only are they sleek and stylish, but they are very practical.

  • Easy to keep clean - When cleaning a bathroom countertop the lip or rim around a drop-in sink can get a little tricky. When you have an undermount sink installed, you can wipe any loose particles or cleaners straight from your countertop into the sink. When there is an exposed rim, loose particles and debris get stuck under there.
  • Adds style - The look is modern, slick, and tidy.
  • Faucets can mount anywhere - Traditionally, many sinks come with pre-cut out holes for faucets already in them. When you install an undermount unit, you place the faucet directly on your countertop instead of your sink. This feature gives you more freedom to decide on where and how you want your faucet to go.
  • More countertop space - With the flat positioning of the undermount bathroom sink, it maximizes the use of your countertop space. That makes it ideal for smaller countertops.


  • Don't work with all materials - laminate countertops do not have a raised rim or edge that can cover and protect the edges, so they aren't recommended for undermount sinks. Undermount lavatory sinks work well with solid surface or stone like granite, quartz, etc.
  • More expensive than other types of sinks - When it comes to both materials and labor, undermount sinks typically cost more because they need weight-bearing and solid countertop materials and require more work for the installation. You will likely need to hire a professional to install it for you (but it is worth it).
  • Extra care - There is a risk that the adhesives around the edges of the sink become damaged by water. This potential issue requires a little extra effort during installation to employ good craftsmanship. It also requires that users pay attention as the sink gets older to be wary of compromised edges.


In selecting the right bathroom sink, you have to think about how it will look when matched with your other fixtures and your countertop. Will the color match or clash? We offer many options for you to choose from, so you can pick the perfect shade. Here are some of the most common selections:

  • White - this color matches easily with almost any fixture and countertop. Most often, people will want to go basic white. If you have plans for changing hardware and faucet finishes, white is a versatile way to go. Plus, it will make your bathroom look cleaner. There are tons of different colors of white, including cotton white, colonial white, biscuit/linen, Sedona beige, bone, and more.
  • Copper - this color/material can give your bathroom a unique personality, but it's tough to match and will take a skilled designing touch to make it work with the rest of the bathroom.
  • Stainless Steel - offers a smooth and shiny surface with a metallic exterior look to the sink.
  • Ebony - is a rich black color which gives a contemporary look to sinks and bathrooms.


We all have our preferences for what the sink should be made out of, which plays a vital role in the sink's durability and ease of maintenance. Here's a list of some of the materials that we offer for bathrooms:

  • Stainless Steel - is an ideal choice for material if you want your sink to be highly heat and corrosion-resistant. It is easy to maintain.
  • Porcelain - is a time-tested choice and by far the most popular. It prevents leakage as it has very low moisture absorbency.
  • Copper - this sink material has natural antimicrobial properties for healthy sanitation and provides a long-lasting performance to your bathroom. It does not rust or corrode even when used extensively over time. Not to mention the glamour and attractive look it brings.
  • Cast Iron - a durable and eco-friendly material for sinks. It is heavy and does not dent or crack which gives a long-lasting performance for your bathroom.
  • Bronze - a sink material known for its resistance to corrosion and it can withstand high temperatures.

Size and Shape

Since undermount lavatory sinks are installed in a customized hole that is cut into the countertop specifically sized for them, you have to choose a design that suits your style and your countertop and by all means, one that fits your bathroom space. If you want to keep the same counter and you're just looking for a replacement for your old sink, you'll have to find an undermount sink with the same size and shape to fit the exact space. We offer more options for sizes that come with round, oval, square, and rectangular shapes.


This installation is slightly tricky, and you want to avoid mistakes because mounting the sink properly and sealing the edges is crucial to ensuring that your sink is supported and can prevent leakage.

  1. Mark your countertop and cut the hole for your sink. A mistake here would be expensive, so you might want to check the sink and the countertop opening to make sure it has the right size. Remember the adage, measure twice, cut once.
  2. Run a bead of silicone on the top rim of the sink.
  3. Set the sink in the center of the opening in your countertop.
  4. Place the mounting clips around the edges and drill pilot holes. Secure the clips by tightening the mounting screws provided. To avoid drilling all the way through the countertop, just put a piece of tape around the bit or use a stopper on the drill bit.
  5. Drill the holes for your faucet. You can attach the faucet while you have access to the lower side of the sink.
  6. With the sink attached, turn on and fasten the countertop to the base counter.
  7. Install the drain and connect the drain lines and overflow pipes to the sink.

That's it. You've just installed an undermount bathroom sink. It's a little bit troublesome, so you may want to consider hiring a professional.

Undermount Bathroom Sinks at PlumbersStock

We have gone above and beyond to find the very best undermount bathroom sinks and are offering them at the very best deals. Our sinks are made with quality materials, from reputable brands, and are built to last. Our wide selection of styles, shapes, colors, brands and installation type make it easy to find exactly what you are looking for, in one easy stop. Brands include:

  • American Standard
  • Elkay
  • Kohler
  • Swanstone
  • TOTO
  • Western Pottery
  • and more!

Save on sink parts and bathroom accessories while you are here.

Wikipedia: Bottom Mount Sink

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