Kitchen sink sizes start with the cabinet underneath. A single bowl usually needs a 600mm base unit, a 1.5 bowl needs 800mm to 1000mm, and a double bowl needs 1000mm or wider.
At Mayfair Kitchens we settle this early, because a sink chosen after the cabinetry has been made will always cost you something. Usually storage. Sometimes worktop space, and occasionally both.
Kitchen Sink Sizes and Base Unit Widths
Your bowl configuration sets the cabinet width:
Depth is a separate decision. Around 180mm to 200mm suits most households, while deeper bowls reach roughly 250mm and take larger pans comfortably. The trade-off is that the base of the sink sits further away, which not everyone finds easy to work at. Choose for what actually goes in the sink rather than for the biggest bowl available.
Kitchen sink sizes and what fits underneath
External dimensions are only half the picture. Clips, waste fittings, pipework, and tap connections all take room inside the cabinet, and whatever is left has to hold everything else you planned to store there.
Bins are the usual casualty. A pull-out has to clear the bowl and the plumbing before it will work at all, and adding a water filter or a boiling water tank swallows whatever space remains. A sink that technically fits can still be the wrong specification.
Standard units leave you working in fixed widths. Made to measure cabinetry lets the designer use the space you actually have, which matters most when the sink, plumbing, bins, and tap equipment are all competing for one cupboard.
Undermount, Inset or Belfast?
What separates them is how they meet the worktop, so establish your worktop material first.
Undermount sinks sit below the worktop, leaving the cut edge visible around the opening. Crumbs and water go straight off the surface into the bowl, which is the main appeal. The catch is that they need a solid, water-resistant material whose cut edge can be finished properly. Standard laminate will not do, because cutting through it exposes the substrate underneath. Settle the worktop material before you commit to an undermount sink, and our guide to worktop materials and cabinet choices covers which surfaces suit one.
Inset sinks drop in from above. The rim sits on the worktop and covers the cut edge, so they work across far more materials, and many come with a built-in drainer.
Belfast sinks are deep ceramic bowls with an exposed front. Their weight and shape mean the cabinet has to be built around them, and the worktop is templated to fit once the sink is in place.
Choosing a Tap
Start with tap holes. Kitchen taps use one, two, or three depending on the design, so nothing should be drilled until the exact tap is confirmed.
Spout reach comes next. Water should land in the middle of the bowl rather than against the back edge or straight onto the waste. A tall spout makes filling pans easier but needs clearance above, and if the sink sits beneath a window, check the tap does not block it from opening.
Water pressure matters more than the tap
Choosing a tap on looks alone is the quickest route to disappointing flow. Low-pressure taps work from around 0.2 to 0.3 bar and suit gravity-fed systems. Higher-pressure taps often need 1.0 bar or more, which is typical of combi and unvented systems.
Fit a high-pressure tap to a system that cannot supply it and you get a weak trickle. Replacing it afterwards is an avoidable cost, and checking the water system during the technical survey stage takes minutes.
Boiling water taps need the same forethought. They free up worktop space by replacing the kettle, but the tank is roughly a 300mm cube and sits in the sink cabinet alongside a socket and sometimes filters. Allow for it before you plan the storage, and leave yourself access for filter changes.
Positioning the Sink
Allow at least 300mm of landing space either side where the room permits, and keep the dishwasher next to the sink. Plates can then be scraped and loaded without anyone crossing the kitchen, and the plumbing stays simpler.
A sink in an island brings plumbing routes and lost storage into play. Our guide to kitchen island dimensions covers the clearances and seating allowances you will need to plan around.
Where washing, prep, and cooking share the same part of the room, plan the ventilation and extraction at the same time rather than afterwards.
Frequently Asked Questions
What size kitchen sink do I need?
It depends on the cabinet beneath it. A single bowl commonly needs a 600mm base unit, a 1.5 bowl needs 800mm to 1000mm, and a double bowl needs 1000mm or wider.
What is the difference between an undermount and inset sink?
An undermount sink fixes below the worktop, leaving the cut edge visible around the bowl. An inset sink fits from above, with a rim that sits on the worktop and covers the opening.
Can you fit an undermount sink to a laminate worktop?
Standard laminate is not suited to a conventional undermount sink, because cutting the opening exposes the substrate beneath. Undermount sinks suit materials whose cut edges can be finished properly.
How many tap holes does my sink need?
One, two, or three, depending on the tap design. Confirm the exact tap specification before the sink or worktop is drilled.
Why is my new kitchen tap running slowly?
This usually happens because the tap needs more pressure than your property can supply. Check the tap specification against your water system before buying.
Do boiling water taps take up cabinet space?
Yes. The tank is around a 300mm cube and needs a power socket, sometimes with filtration alongside it, all inside the sink cabinet.
Specify Your Sink at the Design Stage
Sinks and taps look like finishing touches, but they drive cabinetry, worktop fabrication, plumbing, and storage. Specify them early and the rest of the kitchen does not have to adapt around them.
Founded in 1983, Mayfair Kitchens has over 40 years of experience designing kitchens across Cheshire, Wirral, and the surrounding areas. If your project involves wider building work, it is worth reading about planning a kitchen renovation first.
Visit Mayfair Kitchen Studio at our Cheshire Oaks or Tarporley showroom to see sinks, taps, worktops, and cabinetry together.
Arrange a design consultation with Mayfair Kitchens to start planning a kitchen around the way you use your home.
0151 644 9100
0151 644 9100
