NKBA kitchen guidelines: aisle widths, landing areas and clearances in inches

Published October 26, 2026 by Design Master Solutions LLC

A layout can have every cabinet the client wants and still not work: a dishwasher that hits the corner box when it opens, no counter to set a pot down beside the range, an aisle where two people cannot pass. The National Kitchen and Bath Association (NKBA) planning guidelines put inch numbers on those problems. These are the ones that change which cabinets you order and where they go.

The NKBA kitchen planning guidelines are recommendations, not a building code. Local code and the appliance installation manuals decide what is required; when they ask for more, they win.

The numbers at a glance

Aisles: galley, U and island kitchens

An aisle is measured between the faces of the base cabinets or appliances on each side, not between countertop edges and not from the wall. A walkway, where people only pass, needs 36 inches. A work aisle, where someone stands at a sink, range, dishwasher or counter, needs 42 inches for one cook and 48 for two. A dishwasher door that opens into a 36-inch aisle leaves no room to stand beside it.

The aisle is the first thing to check in a galley or U kitchen, because the room width decides it before any cabinet is chosen. Two runs of 24-inch-deep bases in a room 8 feet wide leave 48 inches: fine. The same runs in a room 7 feet wide leave 36: a walkway, not a kitchen for two. Islands are the other usual problem. An island drawn to fill the space between the runs often ends up at 36 or less on one side.

Landing areas: counter beside each appliance

A landing area is counter where you set something down: the pot off the range, the groceries out of the refrigerator, the roast out of the oven. The guideline numbers are small, but they decide whether a box goes next to an appliance or a tall pantry does.

• Range: 12 inches on one side and 15 on the other. A range pushed into a corner, or right next to a tall cabinet or the refrigerator, misses one side. On an island or peninsula the counter should also run 9 inches behind it.
• Refrigerator: 15 inches on the handle side. If the refrigerator sits beside a pantry, counter across the aisle counts when it is no more than 48 inches away.
• Wall oven: 15 inches beside the oven cabinet, measured from the edge of the tall cabinet, or across the aisle within 48 inches. An oven under the counter already has the counter above it.
• Sink: 24 inches on one side and 18 on the other, plus 36 inches of continuous counter somewhere next to it to prep on. A second prep sink needs only 3 and 18.

Counter that turns a corner counts: measure to the inside corner, then along the return.

Dishwasher and range: doors and clearances

The dishwasher goes within 36 inches of the sink, so a dripping plate does not cross the floor. Beside it there should be 21 inches of standing room before the cabinets on the next wall; a dishwasher right against an inside corner, with no filler, also opens into the doors and pulls of the boxes on the other wall. The same goes for a range against a corner.

Above a range, a wall cabinet or anything that burns needs 30 inches of clearance from the cooking surface, or 24 if it is protected. That is why the cabinet over the range is a short one (W3015, W3018) or a hood. The range manufacturer's manual may ask for more, and then that number governs.

Ventilation is the other range rule: every cooking surface should have a hood or another ventilation system. And no range under a window that opens: a curtain or a breeze over a burner is a fire risk.

The work triangle

The triangle joins the center front of the sink, the range and the refrigerator. Each leg should be between 4 and 9 feet (48 to 108 inches) and the three legs together 26 feet or less. Too short and two people stand on top of each other; too long and every meal is a walk. In a kitchen with several cooks or two sinks, the NKBA treats the triangle as a starting point, not a rule, and the aisles and landing areas matter more.

How Cabinet Project checks a layout

The kitchen layout editor reads the drawing as you place boxes and shows "Design checks: N" in the summary strip: green at zero, amber when there are only recommendations, red when something is a risk. Tapping it opens the list, risks first, each with the measured number and the guideline, for example "The cabinets of Wall A and Wall C are 36″ apart across the aisle; NKBA asks for 42″ for one cook, 48″ for two". Tapping a finding selects the box (or the wall) on the plan and in the elevation. It never blocks saving: it is a recommendation, the same as the guideline.

• Aisles: between an island or peninsula and the cabinets it faces, and between facing walls in galley and U kitchens. Under 36 inches is a risk; under 42 with a counter or appliance on either side is a work aisle warning.
• Landing areas: range (and 9 inches behind it on an island), refrigerator, wall oven in a tall cabinet, sinks and the 36-inch prep area. Counter across the aisle and counter that turns a corner are counted.
• Clearances: wall cabinet under 30 inches above the range, range without a hood, range under a window, dishwasher farther than 36 inches from the sink, dishwasher or range jammed into an inside corner without a filler.
• Work triangle: each leg and the total.

Where the drawing cannot know something, such as which side the refrigerator door opens or whether a window opens, the check assumes the favorable case and the message says so. The aisle is judged against 42 inches for one cook, and the message names the 48 for two, because the drawing does not say how many people cook. For the sizes behind these numbers, see kitchen cabinet sizes, corner cabinet sizes and how to measure a kitchen; for the editor itself, kitchen cabinet design software.