An island can be the most useful part of a kitchen, or the piece everyone walks around sideways. The difference is almost always size and spacing. This guide covers the dimensions that work, the space an island needs around it and how to plan seating, using the planning guidelines kitchen designers commonly follow, including those of the National Kitchen & Bath Association (NKBA).
Start with the space around it, not the island
The most common island mistake is choosing the island first and squeezing the room around it. Work the other way: decide the aisles first, then see what island fits in the middle.
- Work aisles: about 42 inches. This is the space between the island and the counters where you cook. It lets you open the dishwasher, oven and drawers and still stand in front of them.
- Two-cook kitchens: about 48 inches. If two people often cook at the same time, give them more room to pass.
- Walkways: at least 36 inches. A path people walk through, but don't work in, can be narrower.
- Behind seating: more room. If people sit at the island with their backs to a walkway, plan extra space so others can pass behind them (around 44 inches or more where people walk past seated guests).
As a rough rule, two 42-inch aisles plus even a small 2-foot-deep island already take about 9 feet counter to counter, and an island deep enough for seating needs about 10 feet or more. Narrower rooms often work better with a peninsula.
Common island sizes
There is no single standard size, but these ranges are typical.
- Small island: about 2 by 3 feet to 2 by 4 feet. Mostly extra prep space; little or no seating.
- Medium island: about 3 by 6 feet. Room for prep on one side and two or three stools on the other.
- Large island: about 4 by 8 feet or more. Space for a sink or cooktop, storage on both sides and seating for three or four.
What "36-inch-wide" usually means
A 36-inch island depth is a popular choice: it gives you a standard 24-inch-deep cabinet run plus a modest overhang. That overhang is enough for occasional perching, but for comfortable everyday seating at counter height you'll want a deeper top (see below).
Height options
- Counter height (about 36 inches): the same height as the rest of the counters. One continuous surface, easy to work on, paired with 24- to 26-inch stools.
- Bar height (about 42 inches): a raised ledge, often used to hide a sink or prep area from the seating side. Paired with 28- to 30-inch stools.
- Table height (about 30 inches): a lowered section for chairs instead of stools. Comfortable for children and for longer meals.
Seating: overhang and width per person
For comfortable seating, people need knee space under the counter and enough width at the counter.
- Knee space (overhang):
- Counter height (36 inches): about 15 inches
- Bar height (42 inches): about 12 inches
- Table height (30 inches): about 18 inches
- Width per seat:
- Counter height: about 24 inches per person
- Bar height: about 24 inches per person
- Table height: about 24 to 30 inches per person
So a 6-foot (72-inch) run of counter-height seating fits three stools comfortably.
Large overhangs need support. Depending on the countertop material and thickness, an overhang beyond roughly 10 to 12 inches usually needs brackets, corbels or a support panel. Your fabricator will tell you what the stone you choose requires.
Islands with a sink or cooktop
- Sink in the island: allow counter space on both sides of the sink (about 24 inches on one side and 18 on the other is a common target) and plan where the dishwasher goes so its open door doesn't block the aisle.
- Cooktop in the island: leave counter space on both sides and a buffer between the cooktop and any seating. Ventilation (a ceiling hood or downdraft) needs to be planned early.
- Plumbing and power: electrical code sets rules for outlets in islands (and those rules have changed in recent years), and running water and drain lines into an island affects cost and timing. Decide early and confirm what your local code requires.
Quick checklist
- Measure the room counter to counter.
- Subtract 42 inches (or 48 for two cooks) on each working side, and at least 36 inches on walkway sides.
- What's left is the largest island footprint that works.
- Decide on height and seating, then add the overhang to the island depth.
- Allow about 24 inches of width per stool.
- Plan sink, cooktop, outlets and support for any large overhang before you order cabinets.
Every kitchen is different, and local building codes have their own requirements. A layout drawn on your real measurements is the best way to see what fits. Bring your room measurements to one of our showrooms and our design team can sketch island options with you.