Standard Bathroom Vanity Depth
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The standard depth of a bathroom vanity is 21".
The standard vanity depth is 21 inches. But you can gain floor space in a small bath by trimming at least part of the vanity to 18, 15, or even 12 inches deep.
Measure the distance of space available from the wall forward to ensure standard vanity depths will fit easily. Remember to leave room for the swing of the bathroom and shower door. You will also want to be able to leave vanity drawers and doors open without being blocked.
One way to meet the recommended clearance in a small bathroom is to use smaller toilets and sinks. With planning, small corner sinks can be installed or vanity depths can be reduced from 21″ to 15″.
Depth: 17 to 24 inches; If you're purchasing a vanity without a top, you'll also need to measure for the countertop. Measure the width and depth of the vanity cabinet. The vanity top should be 1 inch wider and 1 inch deeper than the vanity cabinet. Be sure to include allowances for fillers if you plan on using them.