900–1,200mm Wide? Plan Kitchen Islands With UK Templates & Checklist
Aim for an island width of 900 to 1,200 mm, a length of 1,800 to 2,000 mm and a worktop height around 900 to 910 mm, with 900 to 1,200 mm of clear space on every side where someone will stand and work. If your kitchen can’t offer at least 900 mm of walkway clearance, treat that as your first red flag. Any gas hob or fixed electrical appliance on the island should be signed off by a Gas Safe registered engineer and a qualified electrician before you commit to a layout.
TL;DR:
A minimum of 900 mm walkway clearance around the island is essential, with aisles for cooking active areas set at 1,050 to 1,200 mm for two people.
Standard island sizes range from 900 x 1,800 mm for family use to over 3,000 mm in length for entertainment, but size should stay within about 10% of the total kitchen floor area.
Overhangs of 300 mm support comfortable seating, with 600 mm width per person, and support must be confirmed for material limits, especially at the edges where weight and frequent use occur.
Site measurements should include existing appliances, socket positions, door swings, and services to ensure the island fits well and meets technical standards before manufacturing.
A professional survey and fixed quote from a specialist like Tenen Ltd can prevent common installation pitfalls and ensure the island layout is optimized for space, services, and usability.
Table of Contents
Standard island sizes and when to pick small, medium or large
Clearance and aisle spacing: the numbers that stop a kitchen feeling cramped
Depth, overhang and seating: how many stools and how much knee room
Height and ergonomics: choosing the right surface height for prep and seating
How to measure your kitchen and simple layout templates to test fit
Standard island sizes and when to pick small, medium or large
Most islands fall into one of three brackets, and the right one depends on the room rather than personal taste. A compact kitchen might only have space for something like 600 x 1,200 mm or 900 x 1,200 mm, which works as a landing spot and a bit of extra storage but rarely supports comfortable seating on top of a hob or sink.
The sweet spot for a typical family kitchen sits at 900 to 1,200 mm wide by 1,800 to 2,400 mm long, giving enough surface for prep, a sink or hob, and seating for two or three without crowding the rest of the room. This range shows up again and again in UK kitchen design guidance because it balances usable worktop against the aisle space it eats up.
Larger islands, anything beyond 3,000 mm in length, bring genuine benefits: more storage, room for a proper breakfast bar, and a natural social hub for entertaining. They also raise practical questions. A single-piece worktop over that length gets heavy and expensive to source, and most fabricators will want to discuss jointing or transport before quoting. Before settling on a size, run a simple sanity check.
The island’s footprint should generally take up no more than around 10% of the total kitchen floor area, so it doesn’t dominate the room.
If your target island pushes past that share, either the kitchen needs more floor area or the island needs to shrink.
A peninsula (an island attached to a wall or run of cabinets on one side) can deliver similar worktop space in a smaller footprint.
Clearance and aisle spacing: the numbers that stop a kitchen feeling cramped
Size on paper means little if the aisles around the island are too tight to use. Working aisles, the space where someone stands and operates a hob, sink or oven, need to be wider than a simple walkway because they account for an open oven door, a person bending to a lower cabinet, or two people passing at once.
Set working aisles to 1,050 to 1,200 mm (42 to 48 in) wherever someone will be actively cooking or preparing food, especially if two people might use the space together.
Keep pure walkways, routes with no working stations on either side, to a minimum of 900 mm, and stretch to 1,200 mm where the dwelling needs to meet Approved Document M accessibility standards.
Add the elements together to test your room: cabinet depth, plus aisle, plus island depth, plus aisle, plus cabinet depth on the opposite wall. Using standard 600 mm base units and 42-inch aisles, this stacked calculation lands at roughly 3.9 to 4.0 metres of clear width, the equivalent of the well-known 13-foot rule from US kitchen planning.
If two people regularly cook together, or the island backs onto seating, add extra width rather than trimming the aisle. Reducing island depth is a far better compromise than squeezing a working aisle below its minimum.
Appliance doors change the sums too. A dishwasher or oven door swinging open into an aisle needs its own clearance on top of the walking space, so measure with the door open, not shut, when you’re testing a layout.
Depth, overhang and seating: how many stools and how much knee room
Island depth typically runs 600 to 900 mm, with the wider end of that range reserved for islands that need two-sided access or that house a hob and sink on the same run. A narrower 600 mm depth suits an island used mainly from one side.
Overhang, the worktop that extends beyond the cabinet carcass to create knee room, follows fairly settled guidance. At standard 900 mm prep height, a 300 mm overhang gives comfortable everyday seating. An overhang of 200 to 250 mm still works for occasional perching but feels tight for a full meal.
Allow around 600 mm of width per person for comfortable seating, or 500 mm if space is genuinely limited.
Leave roughly 300 mm of clearance at each end of a seating run so the last stool isn’t jammed against a wall or appliance.
Deeper overhangs of 350 to 400 mm suit islands designed primarily as a breakfast bar rather than an occasional perch.
Pro Tip: Mark stool positions on the floor with masking tape before the worktop is templated. It takes five minutes and stops you discovering a knee-banging gap after the stone is cut.
Height and ergonomics: choosing the right surface height for prep and seating
Standard UK worktop height for prep work sits at 900 to 910 mm, matched to typical cabinet carcasses and comfortable for most adults working standing up. Breakfast bar sections, where stools rather than standing use the surface, are usually raised to 1,050 to 1,100 mm to suit bar-height seating.
If your household includes someone notably taller or shorter than average, it’s worth measuring elbow height with arms relaxed and setting the worktop 100 to 150 mm below that point, the rough basis most kitchen designers use when adjusting standard heights.
A two-level island, prep surface at 900 mm and a raised bar section behind it, lets one island serve both roles without compromising either. The trade-off is complexity: plumbing and electrics have to route around the step, plinths need extra joinery, and fabrication takes longer, so factor that into both budget and lead time.
Appliances, landing space and technical requirements
Putting a sink or hob into an island raises the stakes on clearance, because every appliance needs somewhere for hands, pans and open doors to go. A tap or hob dropped into the middle of a worktop with no landing space either side becomes awkward the first time you use it.
Leave meaningful landing space, not a token 50 mm strip, on both sides of a sink or hob so you can rest a pan, chopping board or draining dishes.
Add extra aisle width wherever a dishwasher or oven door will swing open into the walkway, and check that swing radius against your working aisle measurement, not just the walkway minimum.
Confirm gas work is carried out only by a Gas Safe registered engineer, and that fixed electrical installations meet BS 7671 wiring regulations.
Plan the routing of water, waste, gas and electrical services at the design stage, before cabinets go in, since moving them afterwards means costly remedial work and visible trunking.
An island with a sink or hob effectively becomes a second kitchen zone, so treat it with the same technical care you’d give a wall run: services identified early, appliance clearances checked against real door swings, and sign-off from the right trade rather than a general assumption that “it’ll fit.”
How to measure your kitchen and simple layout templates to test fit
Before ordering anything, measure the room properly. A tape measure and a rough sketch will tell you more than any online calculator.
Mark the position of every socket, radiator and window on your sketch, since these often dictate where cabinets and services can go.
Note every door swing, including the kitchen door itself, appliance doors and any nearby cupboard doors that open into the same space.
Record the position of existing or planned appliances (fridge, oven, dishwasher) and measure from the finished floor edge, not the current skirting, if flooring is changing.
Test three quick templates against your measurements: a small island (600 to 900 mm x 1,200 mm, needing roughly 3.0 m of clear width including aisles), a medium island (900 to 1,200 mm x 1,800 to 2,000 mm, needing around 3.6 to 3.9 m), and a large island (1,200 mm x 2,400 mm or more, needing close to 4.0 m or beyond).
If your room falls short of even the small template’s clearances, consider a peninsula, a portable island on castors, or a butcher’s-block cart instead, all of which give extra worktop without demanding fixed aisle space on every side.
A more detailed walk-through of measuring and planning a full layout is covered in our guide to planning a kitchen layout, and smaller kitchens have their own set of workable strategies in our piece on small kitchen design ideas.
Materials, worktop thickness and support for overhangs
The material you choose limits how far a worktop can overhang before it needs extra support underneath. This matters most at the seating overhang, where an unsupported edge carries real weight from elbows, plates and the occasional lean.
Compact laminate typically limits unsupported overhang to around 150 to 200 mm before brackets are needed.
Solid surface and quartz or stone worktops can generally extend further unsupported, but the exact limit depends on thickness and the specific manufacturer’s guidance.
Corbels, steel frames and support rails are the common fixes when an overhang exceeds the material’s unsupported limit, and a good fabricator will recommend one based on the finished span.
Always ask the fabricator directly for the maximum unsupported span for your chosen material and thickness, the bracket style they recommend, and how support affects the worktop warranty.
A wider look at how different materials compare on durability, cost and overhang capability is covered in our worktop comparison guide.
Practical examples and copyable templates
These starting dimensions are useful as a briefing note for a designer or supplier, though every one should be checked against your own room before anything is ordered.
Compact template: 600 x 1,200 mm, suited to tight kitchens where the island mainly adds storage and a small landing area. Expect to sacrifice generous seating and keep aisles close to the 900 mm minimum.
Family template: 900 x 1,800 to 2,000 mm, the common sweet spot for everyday cooking and seating for two to three, provided the room can offer 1,050 mm-plus working aisles.
Entertaining template: 1,200 x 2,400 mm or larger, giving room for a hob, prep zone and bar seating together. Worktops at this length often need jointing, so ask a fabricator early about join placement and whether a single slab is feasible.
Professional checklist before you order or build
A proper site survey turns these numbers into a workable plan. It should include measured drawings of the room, a locate of existing water, gas and electrical services, a structural check where an island sits over a suspended floor or near load-bearing elements, and a worktop templating plan agreed before manufacture begins.
The trade sequence matters too: joinery and cabinetry go in first, the worktop is templated once carcasses are fixed, then electrical work is certified to BS 7671 and any gas connection is completed by a Gas Safe registered engineer. Our kitchen renovation workflow sets out this sequence in more detail. Whoever you hire, ask for a fixed quote, a written programme, and confirmation of insurance and workmanship warranty before work starts.
Common on-site pitfalls and quick fixes
The same three mistakes turn up again and again on site: aisles measured to a wall rather than to a swung appliance door, worktop overhangs specified without checking the material’s support limit, and socket positions decided after the worktop template rather than before it. Reserve that 300 mm of seating clearance early, test stool positions with tape on the floor, and get a professional survey done before ordering anything with fixed services or a long unsupported span.
— Mateja
How Tenen Ltd can help with your kitchen island
Getting these numbers right on paper is one thing. Getting them right on site, around your actual sockets, structure and services, is where a measured survey earns its place. A company often carries out measured site surveys and bespoke island design for homeowners in London, then manages the installation in-house with oversight from first measurement to finished worktop.
A survey with us typically covers the same ground set out above, translated into your specific room.
Measured drawings and a services locate before any cabinetry is ordered.
A fixed, itemised quote with no hidden costs once the survey and design are agreed.
In-house joinery, electrical and plumbing trades, so there’s no subcontractor chain to manage.
What you get | Detail |
Site survey | Measured drawings, services locate, structural check |
Pricing | Fixed quote after itemised survey, no hidden costs |
Delivery | In-house trades with director-led oversight, insurance-backed warranty |
If you’re planning a new island as part of a wider kitchen refurbishment in West or Central London, our kitchen refurbishment service is the place to start: book a site survey and we’ll turn your measurements into a fixed quote and a realistic programme.
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FAQ
What is the standard size for a kitchen island?
Most UK islands measure 900 to 1,200 mm wide by 1,800 to 2,000 mm long, which suits a typical family kitchen with room for prep and seating. The exact size should still be checked against your own room’s clearances before you commit.
What’s the standard width of a kitchen island?
Island width most commonly falls between 900 and 1,200 mm, depending on whether the island needs two-sided access or houses a sink or hob. Narrower widths around 600 mm suit compact kitchens where the island serves mainly as storage.
Is a 2m island big enough?
A 2 metre island sits comfortably within the 1,800 to 2,000 mm range that suits most family kitchens, with enough length for a hob or sink plus modest seating. Whether it feels “big enough” depends more on the aisle clearances around it than the length itself.
How wide is a 4 seater kitchen island?
Allowing 600 mm per person for comfortable seating, four stools need roughly 2,400 mm of seating-side length plus end clearances of around 300 mm on each side. The total island length needed depends on overhang and end space requirements.
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