Basin Glossary: Countertop, Semi-Recessed, Pedestal & 30 More Terms

Most bathroom basin mistakes are vocabulary mistakes. A household orders a countertop basin and receives a bowl with no tap hole, or specifies a semi recessed basin and discovers the vanity in front of it is the wrong depth. The words are precise, and knowing them prevents nearly all of it.

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This glossary defines the terms used across UK basin specification, grouped by what they describe: the mounting method, the physical form, the tap arrangement, the waste and overflow, and the materials. Where a dimension is standard practice it is given, because dimensions are specification rather than statistics.

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Key findings at a glance

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• Mounting method, not shape, is the first decision, because it determines what the basin needs behind and beneath it.

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• A basin with no tap hole requires a wall mounted or deck mounted tap sourced separately, which is the single most common ordering error we see.

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• Semi recessed basins exist to solve one specific problem: gaining bowl size in a room too narrow for a full depth vanity.

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• Waste type and overflow presence must be matched, since an unslotted waste fitted to a basin with an overflow will not drain the overflow channel.

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• Pedestals conceal pipework but fix the basin height, while wall hung and vanity mounted basins allow height to be chosen for the household.

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• Projection, the distance a basin stands out from the wall, matters more than width in narrow UK bathrooms and cloakrooms.

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Mounting terms: how the basin is held up

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Countertop basin. A bowl that sits entirely on top of a worktop or vanity unit. Nothing is recessed. The tap is either wall mounted or fitted to the surface behind the bowl.

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Inset or drop in basin. Dropped into a cut out in the worktop, with a rim that rests on the surface. The rim hides the cut edge of the counter.

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Undermount basin. Fixed beneath the worktop so the counter edge forms the rim of the opening. Requires a waterproof worktop material with a sealed cut edge, typically stone or solid surface.

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Semi recessed basin. Part of the bowl sits inside the worktop and part projects forward beyond the front edge of the unit. This allows a full size bowl on a shallow vanity, which is why it appears so often in narrow bathrooms.

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Wall hung basin. Fixed directly to the wall on concealed brackets, with no support beneath. Needs a solid wall or a properly reinforced stud, and the fixing height is chosen at installation.

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Pedestal basin. Supported by a full height column that conceals the pipework to the floor. The column fixes the working height.

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Semi pedestal. A shorter shroud that covers the trap and part of the pipework without reaching the floor. Height becomes adjustable and the floor stays clear for cleaning.

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Vanity basin. Any basin supplied with or designed for a storage unit beneath. Our bathroom vanity units UK range covers the common combinations.

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Cloakroom basin. A compact basin designed for a small WC room, typically with a narrow projection.

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Corner basin. Shaped to fit into a corner, used where wall runs are too short for a conventional basin.

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Console basin. A basin supported on a frame, often metal, with open space beneath. Visually light, with pipework on display.

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Twin or double basin. Two bowls on one worktop, which needs sufficient wall length for both users plus elbow room.

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Form and dimension terms

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Projection. How far the basin stands out from the wall. In a narrow bathroom this is the critical measurement, not the width.

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Bowl depth. The internal depth of the basin from rim to base. Shallow bowls splash more, particularly with a tall tap.

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Splashback lip. A raised rear edge that stops water running down the wall behind a basin.

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Rim. The outer edge of the basin, which may be wide enough to hold soap or narrow for a minimal look.

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Tap ledge or deck. The flat area behind the bowl where a deck mounted tap sits.

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Tap hole. A pre drilled opening for a tap. Basins are supplied as no tap hole, one tap hole, two tap holes or three tap holes.

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Knock out. A pre marked area that can be opened to create a tap hole if required, found on some ceramic basins.

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Vessel or sit on bowl. A term used interchangeably with countertop basin for freestanding bowls with steep sides.

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Integrated or moulded basin. Basin and worktop formed as a single piece with no join, which removes the seam where dirt collects.

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Slimline basin. A basin with reduced projection intended for tight spaces, common in cloakrooms and en suites.

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The table below compares mounting types on the factors that decide which one suits a room. It is specification led rather than a ranking.

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Basin mounting types compared by space demand, height flexibility and pipework visibility:

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Mounting type	Typical projection	Height flexibility	Pipework visibility	Best suited to
Full pedestal	Around 45 cm to 55 cm	Fixed by the column	Fully concealed to the floor	Family bathrooms with a solid wall run
Semi pedestal	Around 45 cm to 55 cm	Chosen at installation	Trap concealed, floor left clear	Rooms where floor cleaning matters
Wall hung	Around 35 cm to 50 cm	Fully adjustable	Exposed unless a bottle trap is chosen	Small bathrooms, accessible layouts
Semi recessed	Bowl projects beyond a vanity of 30 cm to 40 cm	Set by the unit	Concealed within the unit	Narrow rooms needing a full size bowl
Countertop on vanity	Around 40 cm to 55 cm including the unit	Set by the unit, bowl adds height	Concealed within the unit	Rooms where storage is the priority
Cloakroom or corner	Around 25 cm to 35 cm	Varies by type	Often partly exposed	WC rooms and awkward corners

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Tap, waste and overflow terms

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Monobloc tap. A single tap body mixing hot and cold, fitted through one hole.

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Pillar taps. Separate hot and cold taps requiring two holes.

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Three hole mixer. Spout and two separate handles across three holes on the tap ledge.

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Wall mounted tap. Fitted to the wall above the basin, with pipework concealed in the wall. Chosen with no tap hole basins.

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Tall or vessel tap. A raised monobloc designed to clear the rim of a countertop bowl.

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Slotted waste. A waste fitting with an opening that allows the basin overflow channel to drain. Used with any basin that has an overflow.

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Unslotted waste. A sealed waste for basins with no overflow. Fitting one to a basin with an overflow leaves the overflow unable to discharge.

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Click clack or push button waste. A plug operated by pressing it, replacing a chain and stopper.

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Pop up waste. Operated by a lever or rod behind the tap.

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Bottle trap. A compact trap chosen where pipework is visible, as under a wall hung basin.

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P trap and S trap. Trap shapes determined by whether the waste pipe exits horizontally through the wall or vertically through the floor.

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Overflow. A channel moulded into the basin that carries water away if the bowl is filled too far.

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Material and finish terms

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Vitreous china. Glazed ceramic, the most common UK basin material, hard wearing and easy to clean.

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Fireclay. A denser ceramic fired at higher temperature, heavier and more impact resistant.

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Solid surface or composite. A moulded mineral and resin material allowing integrated basin and worktop forms.

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Tempered glass. Toughened glass used for countertop bowls, visually light and demanding of regular cleaning to avoid watermarks.

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Natural stone. Marble, granite or travertine bowls, which require sealing and pH neutral cleaning.

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Glaze. The fired surface layer that makes ceramic non porous. Chips in the glaze expose the body beneath.

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Anti bacterial glaze. A treated surface finish offered on some ceramic ranges.

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What this means for UK homes

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Start with projection, not style. Measure from the wall to the point where the room becomes too tight to walk past comfortably, and allow a clear circulation space in front of the basin of at least 70 cm so a person can stand and lean forward.

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Decide the tap before the basin, or at least at the same time. The number of tap holes is a physical property of the bowl that cannot be changed after delivery, and a no tap hole basin without a wall or deck tap is unusable.

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Match the waste to the overflow, choose a bottle trap wherever the pipework will be on show, and set wall hung basin height to suit the household rather than to a default. Around 85 cm to the rim suits most adults, while a family bathroom shared with young children may sit slightly lower. Finish the room by checking that the mirror above clears the tap when it swings, which is easiest to confirm when choosing from our bathroom mirrors UK range, and plan storage around the chosen mounting type using our bathroom storage units UK selection. The full context sits within our wider modern bathroom furniture UK range.

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Methodology

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This glossary was compiled in 2026 by Furniture in Fashion from our editorial assessment as a UK furniture retailer and from standard bathroom basin specification terminology and dimensions used in the UK market. Projection and height ranges are given as common specification bands rather than as measured averages, because they vary by model. No proprietary sales data, customer data, pricing data or survey fieldwork was used in producing this reference.

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Citing this report

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Media and websites are welcome to cite this glossary with credit to Furniture in Fashion and a link back to this page. It is an editorial reference to UK basin terminology and should be described as such rather than as a technical standard.

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Frequently asked questions

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What is the difference between a countertop and a semi recessed basin?

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A countertop basin sits entirely on top of the worktop, while a semi recessed basin is partly set into the worktop with the front of the bowl projecting beyond the unit. Semi recessed designs exist to allow a full size bowl on a shallow vanity in a narrow room.

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Do I need a slotted or unslotted waste?

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Use a slotted waste if the basin has an overflow, because the slot allows the overflow channel to drain. Use an unslotted waste only where the basin has no overflow at all.

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What height should a basin be fitted at?

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Around 85 cm from the floor to the rim suits most adults, and wall hung and semi pedestal basins allow this to be adjusted. Full pedestal basins fix the height at whatever the column provides.

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Can a tap hole be added to a basin later?

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Only where the manufacturer has provided a knock out section designed for it. Drilling a finished ceramic basin risks cracking the glaze and the body, so the tap hole configuration should be settled before ordering.