I install about a dozen high-end kitchens a year, and have developed a system that prevents frustrating and costly backtracking. Since no two custom kitchens are the same, I have to tweak my approach to fit each situation, but many tasks I perform remain the same regardless of the kitchen. Plumb Walls Are An Installer's Best Friend In my experience, the primary concern of most carpenters when they approach a kitchen installation is to find out if the floor is level. But what about walls that are plumb and square? I've found that in the overall scheme of cabinet installation, the order of importance is: plumb, square, and level. When walls