The right size depends on your vanity width and available wall space. As a general rule, your cabinet should be no wider than your sink vanity — and ideally match it closely. Common widths range from 15″ to 72″.
Measure the space between any obstructions (light fixtures, outlets, walls), then choose the largest size that fits comfortably. A wider cabinet gives more storage and a more balanced look over a double-sink vanity.
