Standard single bathroom vanities are typically around 21 inches deep, but are available in larger dimensions such as 24 or 30 inches that may work better depending on the size of your space and your preferences. You can also find smaller bathroom vanities that are 16 or 18 inches deep so that your vanity doesn’t take up too much space in a powder room or half bath. And of course, custom vanities can be made to fit any space and accommodate a range of sinks.