If the cabinet frames and cases are in good shape, there’s no need to replace them. Companies like Fast Cabinet Doors and CabinetNow both make custom doors in a huge number of styles and ship directly to your house. Most of these services offer your choice of door style, as well as wood species. Some will even paint the doors for you, though you’ll typically be limited to the color options from a single paint manufacturer. You can usually order samples to make sure you select the right finish.
Follow door sellers’ directions to determine which type of doors you currently have. These can range from inset, which sit inside the surrounding frame of the cabinet; half-overlay, which slightly overlap the face frame of the cabinet; or full-overlay, which almost completely cover the face frame of the cabinet. Order doors of the same style as the ones you already have to ensure they’ll open and close properly with your existing cabinet frames. Expect to pay about $40 for an unfinished 12-inch-by-30-inch door with borings and standard hinges.