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.