Bespoke kitchen with a central island, made by Gurteen Kitchens

Kitchen Design · Islands

Kitchen Island Sizes and Clearances

The numbers that decide whether an island works or gets in the way, from a workshop that has been making them since 1993.

Almost everyone planning a new kitchen wants an island. The mistake is nearly always the same: people size the island and forget the space around it. The gap matters more than the box.

The arithmetic

Take the island size and add 1800mm to both the width and the depth. That covers 900mm of clear floor on each side, which is the working minimum. An 1800mm by 900mm island therefore needs roughly 3600mm by 2700mm of clear floor before you count the wall units.

If the room cannot give you that, the honest answer is that it will not take an island, and a peninsula attached to one run will serve you better. Talk it through with us before you commit to a layout.

Clearance: the three figures that matter

Clearance is the distance from the edge of the island worktop to the face of whatever is opposite it. Not the wall behind the units, the front of the units. It is measured wrong more often than it is measured right.

Absolute minimum

900mm

Enough for one person to work and one person to squeeze past. Below this the kitchen feels tight from the first week.

Comfortable

1000–1200mm

Two people can pass each other without either turning sideways. This is where most family kitchens should sit.

Where a door opens

1100mm+

Dishwasher, oven and fridge doors eat most of a 900mm gap on their own, leaving nowhere to stand while you load them.

That third figure is the one people forget. A dishwasher door drops roughly 500mm to 600mm into the room. Put that against a 900mm gap and you have around 300mm of floor left to stand in, which is not enough to bend down and load it.

These are the figures most Irish and UK kitchen designers work to. They are a starting point, not a rule. A galley-style island run used by one cook behaves differently from an open-plan island that doubles as a thoroughfare.

Kitchen island with seating in a bespoke kitchen by Gurteen Kitchens

Open-plan kitchen island and cabinetry, County Mayo

Handmade kitchen with central island and worktop storage

How big should the island itself be?

An island stops being useful below roughly 1000mm by 600mm. Above about 1200mm deep it stops being useful in a different way, because you can no longer reach the middle from either side. Depth beyond that is storage you walk around rather than worktop you use.

Island	Typical size	Clear floor needed	What it takes
Compact	1200 × 700mm	3000 × 2500mm	Prep space and storage. No seating, no services.
Standard	1800 × 900mm	3600 × 2700mm	Prep, storage and two or three seats, or a sink.
Generous	2400 × 1100mm	4200 × 2900mm	Seating and a sink or hob together.
Height	900mm	–	Matches the worktop run. 150mm plinth, 720mm carcass, worktop on top.
Raised bar	1050–1100mm	–	A second, higher level. Hides the working side from the seating side.

The clear floor column already includes 900mm on every side. If the island only has three usable sides because one end meets a wall, you get that 900mm back.

Not sure your room will take one? Send us the dimensions and we will tell you straight.

Book a Consultation

Four checks before you commit

Ten minutes with a tape measure and a roll of masking tape settles most island questions before a designer ever gets involved.

Measure the clear floor

Wall to wall, then subtract the depth of the units on each run. What is left is what the island and its clearances have to share.

Tape it out

Mark the island footprint on the floor. Then walk the kitchen, open the oven, and load an imaginary dishwasher.

Check the doors

Every appliance door, and the room door too. A door that swings into the clearance is a problem you find on fitting day otherwise.

Decide on services

Sink, hob or neither. This has to be settled before the floor goes down, not after.

Seating: overhang and elbow room

Seating is the most requested feature on an island and the most commonly undersized. Two numbers govern it.

Overhang. Allow 250mm to 300mm of worktop projecting past the carcass as a minimum for knee room, and around 380mm if people will sit for a full meal rather than a quick coffee. Anything much beyond 300mm in stone usually needs support underneath, so raise it with your fabricator early.

Width per seat. Allow around 600mm each. Three seats needs 1800mm of clear run with no leg, panel or end return interrupting it. This is why a 1800mm island rarely seats three comfortably once you allow for the ends.

Seat height follows worktop height. A 900mm worktop takes a stool with a seat around 600mm to 650mm. A 1050mm raised bar takes one at 750mm to 800mm.

Kitchen island with seating and overhang detail, Gurteen Kitchens

What goes in the island

An island can hold a sink, a hob, both or neither. Each choice has a knock-on effect worth understanding before it is drawn.

A sink in the island

Puts you facing the room while you work, which is why people ask for it. It also means the island becomes where dishes gather, so think about what your seating area will be looking at. Waste and water have to be run through the floor.

A hob in the island

Needs extraction, either a ceiling unit above or a downdraught within the island. It also needs a safe margin of worktop either side for pot handles, which is worktop you were putting the island in to gain.

Sockets and power

Even a plain island wants power. Plan it in rather than adding it later, and decide early between an end panel socket and a pop-up unit in the worktop.

Storage that suits the depth

Deep drawers work far better than doors in an island, because you can reach the back without kneeling. On a double-sided island, doors on one side and drawers on the other is usually the wrong call.

Every one of these is easier to plan than to retrofit. That is the argument for having the kitchen designed and made by the same people who will fit it, which is how we have worked since 1993. See how the wider process runs in our kitchen design and installation service, or read the latest project notes.

Common Questions

How much space do you need around a kitchen island?

Most designers work to a minimum of 900mm of clear floor between the island and the run behind it, 1000mm to 1200mm where two people pass each other, and at least 1100mm on any side where a dishwasher, oven or fridge door opens. The door itself takes up most of a 900mm gap, leaving nowhere to stand.

What size should a kitchen island be?

An island stops being useful below roughly 1000mm by 600mm. Most family kitchens land between 1800mm by 900mm and 2400mm by 1200mm. Beyond about 1200mm deep you can no longer reach the middle from either side, so extra depth becomes storage you have to walk around rather than worktop you can use.

How big does a room need to be for a kitchen island?

Take the island size and add 1800mm to both the width and the depth, which covers 900mm of clearance on each side. A 1800mm by 900mm island therefore needs roughly 3600mm by 2700mm of clear floor before you count the wall units. If the room cannot give you that, a peninsula attached to one run is usually the better answer.

How much overhang do you need for seating at a kitchen island?

Allow 250mm to 300mm of worktop overhang as a minimum for knee room, and around 380mm if people will sit for a full meal rather than a quick coffee. Allow about 600mm of width per seat, so a three-seat island needs 1800mm of clear run with no leg or panel in the way.

Can you put a sink or hob in a kitchen island?

Yes, and both are common, but each has consequences. A sink or hob needs services run through the floor, which is far easier to plan before the floor goes down than after. A hob in an island needs extraction, either a ceiling unit or a downdraught, and it eats into the worktop you were putting the island in for. A sink also means the island becomes the place dishes gather, which is worth thinking about if it faces your seating area.

Send Us Your Room Dimensions

We design, manufacture and fit kitchens from our own workshop in Gurteen, Ballyhaunis. Tell us the size of the room and we will tell you honestly whether an island suits it.