What is the difference between stock, semi-custom and custom cabinets?

Stock cabinets come in fixed sizes, usually in 75mm increments, and ship in days. Semi-custom uses the same boxes but lets you change door style, finish, interior fittings and some dimensions, and takes four to six weeks. Custom is built to your drawing with no size constraints and takes eight to twelve weeks. Most kitchens are best served by semi-custom: it handles the awkward wall that stock cannot, without the lead time and cost of building every box from scratch.