Two cabinetry quotes can name the same door colour and still differ by a third. The distance sits where you cannot see it: the board behind the finish, how its edges are sealed, whether drawer sides are steel or more of the same board, and how far a hinge can be adjusted once a ninety-year-old floor moves again. This guide reads that line of the schedule out loud.
Carcasses are the boxes behind the doors. In Bentleigh homes where the sink, dishwasher and laundry door often share one short wall, the substrate under the laminate is what decides whether a cupboard floor is still flat in year five. Substrate can be specified run by run, not as one blanket upgrade.
The edge is the honest part of a door. Thin 0.4 mm banding chips at the corner a hand catches; 1 mm ABS with a small radius survives it. Ask which thickness is quoted, and whether the glue line is visible. A seamless laser-applied edge costs more and shows less.
Boards sit still. Hinges, runners and legs move thousands of times a year, and they are the first thing a lean quote quietly downgrades. Four details tell you most of what you need to know before signing anything.