Less Than 24"
With such a small area like less than 24 inches vanities to work with, you have one important decision to make. You have to choose whether or not your small bathroom vanity will have bathroom vanity cabinets or not. Bathroom vanity cabinets will go under your countertop and sink. Some people choose to have full cabinets that extend all the way to the ground while others choose to have half cabinets that are attached to the wall. The choice is for you to make and it all depends on how much storage you want to have in your bathroom.