Are there pre-made tops for pre-made wall cabinets? The typical wall cabinet sold at hardware stores is designed to have the top touching the ceiling, so the top isn't finished to be a good shelf. However, there are cases when wall cabinets might not touch the ceiling - for example, if they are mounted to make them usable by someone in a wheel chair. Is the simplest solution just to make a top out of a 1x12 ?