You've found the perfect island, and then the tape measure comes out. Too tight and you're turning sideways to open the dishwasher. Too loose and the island drifts away from the work triangle, adding steps to every meal. The right gap is the difference between a kitchen that flows and one you fight with daily.
The short answer: leave 1067 mm between the island and opposing counters for one cook, and 1219 mm if two people cook together. These figures come from the National Kitchen & Bath Association (NKBA) Kitchen Planning Guidelines, the industry's most widely used reference for kitchen layout. Below, we cover why those numbers work, how to measure correctly, and which islands fit which room sizes, including the kitchen islands and carts that suit each one.
Table of Contents
Work aisle vs. walkway: why the numbers differ
The NKBA draws a clear line between two kinds of space:
- Work aisle (1067 mm for one cook, 1219 mm for two): the gap between an island and the counters, cooktop, or sink opposite it. People stand, turn, and open things here.
- Walkway (914 mm minimum): a pure passage, such as the route from the dining area to the back door.
The extra 152 to 305 mm in a work aisle accommodate a standing cook, an open dishwasher or oven door, and someone squeezing past. This is why 914 mm looks fine on a floor plan but feels cramped in real use. If the gap is where you prep, cook, or load appliances, plan for 1067 mm or more.
Map the island's job before choosing a size
Each side of an island does a different job, and each side needs its own clearance:
- The cooking side faces the range or sink. Give it a full 1067–1219 mm.
- The seating side needs room for stools plus a path behind them, so allow more than a bare work aisle.
- The ends are traffic routes. If they connect the kitchen to a hallway or dining room, keep them at 914 mm or wider.
Before shopping, sketch your kitchen and mark the sink, range, refrigerator, and doorways. Then note which island sides will be prep zones, which will be seating, and which will be thoroughfares. That sketch will narrow your options faster than any product filter.
How to measure the gap correctly
Measure from the projecting surfaces, not the cabinet bases. Countertop overhangs, handles, and appliance fronts all eat into clear space, so find the narrowest point on each side.
Then use this simple formula for the cross-room span:
Island depth + two work aisles = minimum span between opposing counters
Example with a 3048 mm span between two parallel counter runs:
- 762 mm island + 1067 mm + 1067 mm = 2896 mm, leaving 152 mm to spare
- 813 mm island + 1067 mm + 1067 mm = 2946 mm, leaving 102 mm to spare
51 mm of island depth can decide whether a layout works. Run the same math along the island's length to check the end routes.
Finally, tape it out on the floor. Mark the island footprint with painter's tape, then open the dishwasher and oven, pull out a stool, and walk a full meal prep. This 10-minute test catches problems that no drawing will.
Which island fits which kitchen
Start with the span between your opposing counters, subtract the island depth, and see what’s left for aisles. Use this table to find your size category first.
Island type | Typical footprint (W × D) | Min. span with 1067 mm aisles | Min. span with 1219 mm aisles | Best for |
Rolling cart / prep cart | 610-1016 mm × 406-610 mm | 2540-2743 mm | 2845-3048 mm | Small or galley kitchens, renters, flexible layouts |
Compact island | 1016-1270 mm × 610-762 mm | 2743-2896 mm | 3048-3200 mm | Mid-size kitchens, one-cook households |
Standard island | 1397-1651 mm × 762-813 mm | 2896-2946 mm | 3200-3251 mm | Open-plan kitchens, families, occasional hosting |
Large island | 1778 mm+ × 813-914 mm | 2946-3048 mm | 3251-3353 mm | Spacious kitchens, two-cook setups, heavy storage needs |
How to read it: Min. span = island depth + two work aisles (depth + 2134 mm for 1067 mm aisles, depth + 2438 mm for 1219 mm aisles). If your opposing counters are 2794 mm apart, you can fit a compact island with 1067 mm aisles, but not a standard one. If the span is just short of a category, move down one size rather than shrinking the aisles.
Compact island: the 1270 mm island with built-in lighting
The 1270 mm LED-Lit Kitchen Island measures 1270 mm wide by 762 mm deep by 889 mm high, with doors, a drawer, and adjustable shelving.
At 762 mm deep, it's the easiest of the three to fit into a mid-size room. A kitchen with 2896 mm between opposing counters can hold it with a full 1067 mm on both sides.
Real-life scenario: A couple cooking dinner in a 3 m-wide kitchen. One person preps at the island while the other works the range behind them. The shorter 1270 mm length keeps both ends open, so you can still reach the refrigerator or step out to the dining area without squeezing past a corner. Use the drawer for knives and utensils at the prep spot, and the adjustable shelving for pots and small appliances you want within arm's reach. The built-in lighting also gives you a work light over the surface for evening cooking.
Standard island: the 1524 mm extendable island
The 1524 mm Extendable Kitchen Island is 1524 mm wide and 800 mm deep when retracted, with three drawers and two shelves, and an extending top that adds surface area when you need it.
Plan it twice: once closed for everyday use, and once extended for guests. Check that the extended position still leaves a clear route at the end of the island.
Real-life scenario: A family that cooks on weeknights and hosts on weekends. During the week the island stays compact, with the three drawers handling cutting boards, baking tools, and everyday cookware. On party days, extend the top to create a buffet line or a baking station for a holiday cookie session. If your kitchen has a spare 305 mm or two at the island's end, the extension turns one piece of furniture into two layouts.
Large island: the 1829 mm sintered stone island
The 1829 mm Black Sintered Stone Kitchen Island is 1829 mm wide by 813 mm deep by 889 mm high, with cabinet, drawer, and shelf storage under a stone top.
This is the one for kitchens with at least 2946 mm between opposing counters. The 1829 mm length gives you a real prep zone plus room to spread out, and the 813 mm depth supports a wide working surface.
Real-life scenario: A household where two people cook at once, or one person bakes while another preps. Split the island into zones: a baking and rolling area at one end, chopping near the sink side, and storage you can reach from both. If the dishwasher sits across from the island, keep your most-used drawer fronts away from its door swing so opening one never blocks the other. For the two-cook setup, aim for the 1219 mm aisle on the busier side and use the extra length to keep the two workstations apart.
Placement mistakes to avoid
- Measuring between cabinet bases instead of countertop edges. Overhangs can steal 25–51 mm on each side.
- Planning around closed doors. Open the dishwasher, oven, and refrigerator in your tape layout and stand where you'd really stand.
- Forgetting seating depth. A tucked-in stool is smaller than an occupied one. Leave a path behind seated guests.
- Optimizing one side only. Pushing the island toward a wall may improve one aisle and wreck another. Check the whole perimeter.
- Ignoring end routes. A generous work aisle doesn't help if the island's end blocks the way to the pantry.
If the numbers don't work, choose a smaller island rather than squeezing the aisles. A 1270 mm island with comfortable gaps beats a 1829 mm island that traps you.
Frequently Asked Questions
Is 914 mm enough between cabinets and an island?
914 mm works for a pure walkway, but it's tight for an opposing work aisle. If anyone prepares food or opens appliances in that gap, aim for 1067 mm or more.
Where do I measure the gap from?
From the countertop edge or appliance front on one side to the island's edge on the other, at the narrowest point. Include overhangs and handles.
Does an appliance door opening count?
Yes. Open the dishwasher or oven in your tape layout and check that you can still stand in front of it and that someone can pass behind you.
How much room do I need behind island seating?
Plan for the occupied stool position plus a path behind it. Leave more than the basic 914 mm walkway if people will pass behind seated guests.
Are these building-code requirements?
They're NKBA planning recommendations, not code. Local codes and accessibility needs vary, so check them for permanent renovations.