Similarly one may ask, do top and bottom cabinets need to line up?
Upper and lower cabinets may align at each end, and they sometimes do. However, aligning every upper and lower cabinet throughout the room is rare. As long as the cabinets are installed securely, almost anything goes.
Subsequently, question is, do you install upper or lower cabinets first? Cabinet installers will probably never agree on whether upper or lower cabinets should be installed first. Installing upper cabinets first allows better access for lifting the cabinets in place, whether you use extra manpower or special tools such as cabinet lifts. But installing lowers first can also have advantages.
Regarding this, how do you install cabinets on an uneven wall?
Begin by placing the cabinet and leveling it with wedges. Install the cabinet as you would normally, with screws through the back rail at the top on uppers, and screws through the bottom on bases. If the walls are uneven, there will be gaps on the sides. Use a simple, flat piece of trim molding to cover the gaps.
Should kitchen cabinets go to the ceiling?
The clearest indicator of how tall your kitchen cabinets should be is the height of your kitchen's ceilings. The kitchen cabinets and molding do not go to the ceiling and the wall cabinets and trim will be just below the ceiling. Any crown molding or trim will continue around the room, above the cabinetry.