Almost every kitchen complaint we hear on a first survey is really a complaint about the aisle. People describe it differently. They say the kitchen feels cramped, or that they cannot cook together, or that the dishwasher is annoying. When we put a tape across the room, the number is nearly always between 36 and 40 inches.
Forty-two inches is the figure to design to, and it is worth understanding what it is actually made of rather than treating it as a rule handed down from somewhere.
Where the number comes from
A person standing at a counter working occupies about 24 inches of depth from the counter face. That is not the depth of a body; it is the depth of a body plus the forward lean and the elbow room needed to chop, stir or load. Behind that person, a second person needs roughly 18 inches to pass without contact.
Twenty-four plus eighteen is forty-two. That is the entire derivation. It is not a code minimum, it is an ergonomics figure, which is why a kitchen at 40 inches does not fail inspection but does fail in use.
The doors are the part people forget
An aisle is measured between the finished faces of what is on either side, not between the walls and not between the cabinet boxes. The things that eat into it are the appliance doors.
A standard 24 inch dishwasher door, open flat, projects about 26 and a half inches from the cabinet face. A 30 inch oven door projects about 22 inches. Put those two on opposite runs in a 42 inch aisle and they will meet in the middle with about 6 inches to spare, which is fine. Put them in a 36 inch aisle and they physically cannot both be open.
This is why our surveys record which appliance is where, and why we redraw the plan if a client changes an appliance choice late. The aisle is a function of the appliances, not only of the cabinetry.
When 42 is not the right answer
- 36 inches is enough for a walkway that nobody works in, such as the route past the end of a run to a back door.
- 48 inches is the figure for two genuine cooks, and the figure to use whenever a dishwasher and an oven face each other.
- 44 inches applies behind seating, measured from the counter edge to whatever is behind the stools. A stool pulled out takes more room than a person standing.
- Above about 54 inches the aisle stops helping. You are now walking between the sink and the range on every step, and the work triangle grows past the point where it is comfortable.
What this means for a Portland galley
Most pre-war galleys in this city are between 92 and 104 inches wide. Two standard 25 inch deep runs leave 42 to 54 inches. That means the room is usually fine as built, and the aisle has been lost to something added later.
The most common culprit is a full-depth refrigerator. A standard 36 inch French-door refrigerator is about 30 inches deep at the doors, which is 5 inches past the cabinet line. In a 92 inch room that turns a 42 inch aisle into a 37 inch aisle on the refrigerator side, and that is where the kitchen starts to feel impossible.
A counter-depth unit costs more and holds slightly less. In a narrow galley it is almost always the right purchase, and it is cheaper than moving a wall.
How to check your own kitchen in five minutes
- Measure between the two opposing cabinet faces, at counter height, at three points along the run.
- Open the dishwasher fully and measure from its door edge to the opposite face.
- Open the oven fully and do the same.
- Stand at the sink as though you were working, and have someone try to pass behind you carrying a tray.
- Write the four numbers down. They will tell you more about your kitchen than any mood board.
If the numbers are uncomfortable, the fix is not always a bigger room. In the last two years we have recovered a working aisle by changing a refrigerator, by moving a dishwasher to the other run, and by moving a doorway 40 inches. None of those involved taking out a wall.