Undermount Basins

Explore our luxurious and decorative range of undermount sinks. Refined, seamless, and quietly elegant, these undermount basins are designed to sit beneath the surface, creating a clean and uninterrupted finish. With their unique designs and artisanal detailing, they transform your bathroom into a space that makes a subtle yet striking statement, much like the aesthetic seen in our countertop basins.

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Why Choose a London Basin Company Undermount Basin

A London Basin Company undermount basin brings together timeless design, exceptional craftsmanship and understated luxury. Handcrafted from fine porcelain ceramic clay, each basin is thoughtfully designed to sit seamlessly beneath the worktop, creating a clean, elegant aesthetic that allows beautiful vanity surfaces and premium materials to take centre stage.

Handcrafted Designs with Timeless Appeal

From delicate botanical patterns to richly textured finishes, our collection offers a distinctive alternative to conventional white bathroom sinks. Whether you’re creating a refined family bathroom, a luxurious en-suite or an elegant cloakroom, our undermount basins add character, craftsmanship and enduring style to every space.

Designed to pair beautifully with our bespoke vanity units and premium brassware, each basin forms part of a considered bathroom scheme that is both functional and beautifully curated.

Our Undermount Basin Designs

Each undercounter basin in our collection is distinguished by its own unique finish, from understated textures to intricate hand-applied patterns, allowing you to create a bathroom that reflects your individual style.

Calypso White keeps things pared back with a scalloped texture that echoes the delicate ridges of a seashell. Calypso Gold takes the same shape and covers it in a gold electroplated finish, which turns a quiet form into something far more dramatic on the counter.

Aurora leans into pattern rather than texture, with a bold admiral blue rose design set against glossy white porcelain. Wisteria takes a softer route, with trailing lilac blooms and green leaves that nod to Victorian botanical design.

Vanity Units and Taps to Pair With Your Basin

Our luxurious Archer and Ellis undermount vanity units are designed to complement our range of undermount basins. Both the Archer and the Ellis are handcrafted in the UK using Tulipwood and Hydrofugo for true quality assurance.

Your vanity unit is unique to you. Choose from three exquisite surfaces – white quartz, black granite, or white marble effect quartz – and match your unit to your bathroom’s aesthetic with any paint colour from Farrow & Ball or Little Greene. With the option to be made-to-measure, these vanity units give you full creative control over your space.

To bring the scheme together fully, pair your basin and vanity unit with a wall-mounted or deck-mounted tap. Available in a selection of finishes to complement the hardware of your vanity unit, our contemporary taps bring the final touch to a bathroom designed for everyday luxury.

Gold fluted undermount basin with brass cross-handle wall tap, white arch tiles

How London Basin Company Makes All the Difference

Founded by interior designer Anna and her daughter Nathalie, the brand grew from a search for decorative ceramic basins that simply did not exist on the market. That same eye for design still shapes every collection released today.

We work with private clients designing a single bathroom and trade clients on larger residential and commercial projects, both met with the same attention to detail. Basins, freestanding vanity units, basin taps and support brackets are built to sit together as one considered scheme, so a bathroom or cloakroom carries the same craftsmanship throughout, whatever the size of the space.

Visit our Chelsea Harbour showroom to experience the craftsmanship firsthand, or explore the collection online.

Everything You Need to Know About Our Unique Undermount Basins

FAQS

Have a question about our undermount basins and sinks? Here are the answers to the most common queries to help guide your choice.

What are undermount basins?

Undermount basins are fitted beneath the bathroom counter rather than on top of it, so the worktop surface stays clean and uninterrupted. It is a quietly practical format that does not ask you to compromise on beauty or craftsmanship.

How are your undermount basins installed?

Our undermount bathroom sinks can be fitted by any qualified plumber. Installation involves creating a precise cutout in the worktop to the dimensions provided in the supplied template, then securing the basin to the underside of the countertop using 100% silicone sealant or a specialist sink adhesive. Your installer may recommend additional support depending on the worktop material. When fitted correctly, the basin sits flush beneath the surface, creating a stable and seamless finish.

Are your undercounter basins supplied with a basin-cut out template?

Yes. Every undercounter basin comes with a dedicated cutout template, giving your fabricator or installer the exact dimensions and shape needed to prepare the worktop surface accurately before fitting the sink.

What is the difference between undermount basins and countertop basins?

Both formats have their strengths, but they create quite different results in the bathroom:

Countertop basins rest above the vanity surface and become the focal point of the room, bold in form and expressive in character.
Undermount sinks are fitted beneath the worktop, so the counter reads as one clean, uninterrupted surface, and the basin plays a quieter, more integrated role.
Undermount sinks are generally easier to clean, with no rim for water or debris to catch around.
Countertop basins offer greater freedom in shape, colour, and decorative detail, and at London Basin Company, that range is extensive.

Do your products come with a Guarantee?

All our basins come with a 5-year guarantee, reflecting our confidence in their quality and craftsmanship. Every design is tested for durability and intended to remain as striking as the day it was installed.

What are the practical benefits of undermount bathroom basins?

With no rim at the basin edge, the worktop stays completely clear and uninterrupted, making cleaning genuinely easier. Water and debris wipe straight from the counter into the basin with nothing to catch around and no joints for grime to collect in over time.

The flush installation also makes the vanity area feel more open and spacious, particularly valuable in smaller bathrooms. And with no basin occupying the surface, more of the worktop remains usable day to day.

Can undermount basins work in small bathrooms?

Beautifully. With no basin sitting proud of the surface, the worktop feels more open and the overall scheme far less visually cluttered.

What shapes are available in the undermount range?

All of our undermount basins are oval in form, a shape that brings a softer presence to the vanity area than a square or rectangular basin would. The Calypso takes this further with a beautifully scalloped texture across its surface, drawing on the natural form of a seashell to create something that feels both refined and individual.

What colours are undermount basins available in?

Our undermount basins are built on a porcelain base, with each design bringing its own decorative character. The Calypso White keeps things pure and unfussy with a clean all-white finish, while the Calypso Gold makes a bolder statement with an all-over gold electroplated finish. The Aurora layers deep admiral blue onto white, and the Wisteria brings soft lilac blooms and green leaves to the surface for something altogether more painterly.

How does an undermount basin affect the sense of space in a bathroom?

Because an undermount basin is fitted below the worktop rather than above it, the vanity area feels more open and less visually busy. The counter reads as a single, uninterrupted surface, which makes the room feel more considered and calm, particularly in bathrooms where space is limited. Paired with a natural stone or quartz worktop, the effect can be genuinely striking.

Can I view the undermount basin sink collection in person?

Yes, and we’d love to welcome you. Visit our Chelsea Harbour showroom to see our undermount sinks up close, experience the quality of the craftsmanship for yourself, and get a true sense of how each piece looks within a complete bathroom scheme.

Can you help me choose the correct undermount basin?

Yes. If you are planning a bathroom design around one of our undermount basins, our free bathroom design advice service is here to help. Whether you are working with a compact cloakroom or a larger bathroom, our team can guide you through sizing, styling, and pairing options to make sure everything comes together beautifully. Get in touch and let us help you create a space you will love.

Are the undermounts easy to maintain?

Yes. Simply use a mild detergent or a PH neutral cleaner and avoid abrasive materials that could damage the surface. Clean regularly to prevent a build-up of soap, grease, and dirt, then wipe dry with a soft cloth.

Are your undermount sinks compatible for use worldwide?

Yes. Our undermount sinks are designed for international compatibility. Each basin has a standard 4.5 cm waste hole, making it compatible with plumbing systems worldwide. They work with standard slotted wastes designed for basins with an overflow and universal wastes worldwide, so installation is just as straightforward whether your project is based in the UK or overseas.

What waste is compatible with our undermount sinks?

As all of our undermount basins feature an overflow, they are compatible with slotted or universal basin wastes worldwide. The 4.5 cm waste hole is designed to accommodate standard fittings, so sourcing the right waste for your installation is straightforward, whether you are based in the UK or internationally.

Are your undermount bathroom basins durable?

Yes. Our undermount bathroom basins are designed with everyday use in mind and can last for decades. Each basin is handcrafted from high-quality porcelain (the highest quality ceramic clay), and fired at temperatures of 1,300 degrees up to three times. This process closes small air gaps within the ceramic, creating a denser, stronger material with a durable surface.

Each design is individually tested for durability to ensure it meets our exacting standards for long-lasting performance. The protective glaze also helps preserve the decorative detailing, keeping your basin looking as refined as the day it was installed. Our undermount basins are trusted and used regularly across residential, commercial, and hotel projects.

Do you offer international delivery?

Yes, we ship to most destinations worldwide. If your country is not listed, please get in touch with our team and we’ll be happy to prepare a delivery quotation for you.

Do you offer next day delivery?

We offer next-day delivery as standard for UK customers on all in-stock items. If an item is not in stock, or you are ordering from outside the UK, delivery times will vary. More information is available on our shipping page.

What is your returns policy?

We hope you’ll be delighted with your purchase. However, if for any reason you wish to return an item, please contact us within 14 days of receiving your order, quoting your invoice or order number. Subject to our returns policy, we can offer a refund, replacement, or credit towards a future purchase.

Please note that bespoke and custom-made items are not included in this policy. If you have ordered a bespoke or custom item, please contact us for further information on our bespoke and custom items returns policy.