This is a professional question. Normally, people think that kitchen cabinet doors are the same size as the kitchen cabinet carcass. Actually, they are not.

Kitchen cabinet doors should normally be 3mm less in width and length than the cabinet carcass.

You can see the detailed drawings below. For example, a standard base cabinet B400 has a width of 400mm and a height of 750mm. The door panel for this cabinet is 397mm x 747mm. This means there is a 1.5mm gap on each side to allow the cabinet door to open smoothly. It’s same for drawer cabinets doors.

Nowadays, many kitchen cabinets are designed in a handleless style. In this case, the door size not only needs to consider the opening but also the handle panels. Below are the details for cabinets with a bevel handle structure and the corresponding door measurements.

Normally, when we begin to produce the cabinets, we need to consider all these details. It’s a bit complicated, but not difficult to understand. Just be clear on the handle panel size and remember to leave 1.5mm less on each side of the door.