Undermount bathroom sinks are a popular choice for modern and contemporary bathroom designs. As the name suggests, undermount sinks are installed underneath the countertop, creating a seamless and stylish look. With their clean lines and minimalist aesthetic, undermount sinks are ideal for achieving a sleek, modern bathroom design.

In this comprehensive guide, we will explore everything you need to know about undermount bathroom sinks, including the pros and cons, the installation process, the best materials and styles, as well as maintenance and cleaning tips. We will provide an in-depth look at undermount sinks to help you decide if they are the right choice for your bathroom remodel or renovation.

What are Undermount Bathroom Sinks?

Undermount bathroom sinks, also sometimes called bottom-mount sinks, are installed underneath the countertop rather than dropping into the countertop. The edges of the sink are fixed to the underside of the countertop, creating a smooth and seamless look.

Unlike a drop-in or self-rimming sink that rests on top of the counter and has an exposed rim, an undermount sink has no lip or edge. This allows the countertop material to flow smoothly from the counter into the sink basin. The result is a very modern, integrated look with clean lines and minimal seams.

Undermount sinks provide a sleek, contemporary aesthetic that works very well with solid surface countertops like quartz or solid surface acrylic. They are also commonly used with natural stone countertops like granite. The seamless design highlights the beauty of the counter material.

Some key benefits of undermount bathroom sinks include:

  • Streamlined contemporary look
  • Easy to clean with no rim to trap dirt and grime
  • Countertop flows smoothly into sink for seamless appearance
  • Works well with solid surface and stone countertop materials

Pros and Cons of Undermount Bathroom Sinks


  • Sleek, modern aesthetic: The main advantage of undermount sinks is the seamless, contemporary look they create. By removing the rim, the sink appears integrated into the countertop for a very streamlined style.
  • Easy to clean: With no lip for dirt and grime to get caught, undermount sinks stay cleaner and are easier to wipe down than drop-in sinks. Their smooth basins don’t allow gunk to build up.
  • Flexible countertop options: Undermount sinks work well with almost any countertop material, including solid surfaces, natural stone, quartz, concrete, and more. Their versatility allows for creative countertop design.
  • Durable: Undermount sinks are very sturdy and durable when properly installed. They are designed to bear a lot of weight and use.


  • Challenging installation: Undermount sink installation is more complex than drop-in sinks. The countertop must be precisely cut to size, and the sink secured properly to avoid leaks. Improper installation can lead to damage.
  • Higher cost: In general, undermount bathroom sinks are more expensive than self-rimming or vessel sink options. Installation is also pricier. Overall, expect to pay more for both the sink and labor.
  • Permanent: Undermount sinks are usually permanent installations and not easily replaced. Uninstalling them requires cutting the countertop.
  • Messy underneath: Any water drips or spills under an undermount sink are not contained by a rim and can make a mess on cabinets or drawers underneath.

How to Install an Undermount Sink

Installing an undermount bathroom sink takes careful planning and precision. Here are some tips for a successful install:

  • Choose the right countertop: Undermount sinks depend on the countertop material for support. Granite, marble, quartz, solid surface, and concrete all work well. Tile is not recommended as it lacks continuous surface area.
  • Make proper cutouts: The sink cutout needs to be professionally cut based on the exact dimensions of the sink. Any gaps or imprecise cutting can lead to leaks or breakage.
  • Seal and secure: Waterproof adhesive and silicone caulk is used to completely seal the sink perimeter to the underside of the countertop. The sink must be properly supported.
  • Connect plumbing: Drain and supply lines need to be hooked up properly to avoid leaks. Accessing plumbing may require custom cabinetry.
  • Consider pros for install: Due to complexity, undermount sink installation is often best left to professional contractors, unless you are very experienced with bathroom remodeling.

Proper undermount sink installation is challenging, but results in a secure, watertight mount that should last for decades. Taking shortcuts risks water damage and other issues down the road.

Choosing the Right Undermount Sink Materials

Undermount sinks come in a diverse range of materials, each with their own properties, strengths, and looks. Choosing the right material requires considering your priorities such as durability, appearance, maintenance, and cost. Here are some top options:

Stainless Steel

  • Pros: Very durable and dent-resistant. Stainless steel offers a modern, industrial look. Easy to clean and disinfect. Budget-friendly option.
  • Cons: Can show water spots, mineral deposits. Stainless steel is prone to scratching. The industrial look may not suit all décor.

Enameled Cast Iron

  • Pros: Classic, timeless look. Available in a huge range of color glazes. Resilient and long-lasting. Can be undermounted or drop-in.
  • Cons: Enamel coatings can chip over time. Heavy weight requires sturdy countertop support. High upfront cost.

Solid Surface

  • Pros: Seamless, integrated look. Matching countertop options available. Non-porous and hygienic. Customizable. Stain-, chip-, and scratch-resistant.
  • Cons: Not heat resistant. Can be stained by harsh chemicals. Higher cost than some materials. Limited color range.

Ceramic / Porcelain

  • Pros: Glossy, sophisticated look. Available in range of colors. Resists scratches, stains, and heat damage. Easy to clean.
  • Cons: Risk of chipping from impact. Grout lines can gather dirt. Not as durable as other options.


  • Pros: Affordable but attractive option. Easy to clean and maintain. Durable and impact-resistant. Can mimic higher-end materials.
  • Cons: Quality and composition varies widely. Generally a lower-end material with shorter lifespan.

Consider your bathroom look, budget, and expected usage to select the right undermount sink material for your needs. Stainless steel, enameled cast iron, and solid surface composites are popular choices that balance aesthetics, durability and cost.

Common Styles of Undermount Bathroom Sinks

Beyond material, undermount bathroom sinks come in a variety of common styles and shapes to suit different spaces:


The most popular option, rectangular undermount sinks work well in most bathroom layouts. Their clean lines offer a pared-down, contemporary look. Extra depth provides more functionality.


Square undermount sinks make a bold style statement while still offering generous wash space. The symmetrical shape pairs nicely with square counter edges.


For a soft yet still modern style, oval undermount sinks provide flowing curved lines. Their elongated shape works well on larger vanity tops.


Vessel sinks can also be undermounted for a hybrid floating-yet-integrated look. This adapts the vessel aesthetic for a more seamless minimalist style.


Farmhouse-style undermount sinks combine vintage charm with modern practicality. The large, deep single basin evokes traditional farmhouse designs.

Double bowl

For additional functionality, double-bowl undermount sinks provide two sink spaces. This allows for tasks like grooming in one basin while using the other to tidy up.

The shape and configuration of your undermount sink significantly contributes to the overall look and utility. Consider existing bathroom elements and furniture placement when selecting a style.

How to Care for and Maintain Undermount Bathroom Sinks

Undermount bathroom sinks stay cleaner than drop-in models, but still require regular care and maintenance. Here are some tips for keeping your undermount sink looking like new:

  • Clean frequently: Make a habit of wiping out the basin regularly to avoid buildup of soap scum, toothpaste, and minerals that can stain the sink.
  • Use non-abrasive cleaners: To prevent scratching or wearing down the sink surface, use soft sponges and non-abrasive liquid cleaners. Avoid harsh scrubbers.
  • Rinse thoroughly: After cleaning, make sure to rinse the sink thoroughly to remove any chemical cleaner residues which can damage finishes over time.
  • Seal stone sinks: Natural stone sink surfaces need to be regularly sealed to prevent staining and etching from acidic substances.
  • Inspect caulking: Check for any cracks in the caulk seals around the sink perimeter which can allow water intrusion and damage. Re-caulk as needed.
  • Wipe spills: Due to the lack of a rim, be sure to wipe any water spills or splashes under the sink edges to avoid cabinet or counter damage.

With regular cleaning and careful use, your undermount sink should continue looking like new for years of beauty and function in your bathroom. Be sure to address any minor repairs immediately to prevent bigger issues.

Frequently Asked Questions About Undermount Bathroom Sinks

Are undermount bathroom sinks harder to install?

Yes, undermount sink installation is more complex than drop-in sinks. The sink must be properly secured to the underside of the countertop and all edges completely sealed. This requires special skills and tools. Hiring a pro is highly recommended.

Do you need a special vanity for an undermount sink?

In some cases a new vanity is required. Vanities with pre-cut countertops likely only accommodate drop-in sinks. Custom-cut stone or solid surface tops are ideal for undermount sink installation.

Can you put an undermount sink in a granite countertop?

Granite makes an excellent countertop material for undermount sinks. The stone is dense and strong enough to provide ample support once precisely cut to size. The seamless look is also beautiful.

Are undermount bathroom sinks more expensive?

Yes, undermount sinks generally cost more than self-rimming or vessel sink options. Installation is also pricier since it is more complex. Overall expect to pay 15-30% more for an undermount sink.

Can you remove an undermount sink from a countertop?

Removing an undermount sink requires cutting the countertop, so sinks are generally not designed to be easily taken out. Replacing an undermount sink means also replacing the countertop.


With their clean, minimalist look undermount bathroom sinks are a fashionable contemporary choice. By installing underneath the counter they create a seamless appearance. They offer easier cleaning than drop-in models but require careful installation and maintenance.

Choosing your sink material, size, and shape are important decisions that impact form and function. Popular options like stainless steel, enameled cast iron, and solid surface composite offer beauty and long-term durability. Undermount sinks work especially well in bathrooms with solid surface counters like quartz.

While pricier and more complex to install than other sink varieties, undermount models provide a sleek modern aesthetic that makes the cost worthwhile for many homeowners. If thinking of installing an undermount bathroom sink in your home, be sure to carefully plan all aspects of the project to ensure it goes smoothly. With proper care, your new undermount sink will transform your bathroom into a functional and stylish oasis.