How to Choose a Bathroom Vanity Size

October 11, 2026

Whether you're redoing a powder room or a primary bath, the right bathroom vanity size depends on your wall space, plumbing and how much storage you need. Here's how to choose.

Standard bathroom vanity sizes

16–24 in: powder rooms and small half baths
30 in: small full bathrooms and guest baths
36 in: the most popular size for hall and guest bathrooms
48 in: primary bathrooms with one sink and plenty of counter space
60–72 in: primary bathrooms with double sinks

How to measure for a new vanity

Measure the wall width and subtract at least 1–2 inches on each side (more if next to a tub or shower door).
Measure the depth: standard vanities are about 21 in deep; choose 18 in or less for tight spaces.
Note where your water supply and drain pipes come out of the wall so the cabinet and sink line up.
Check door swing and walkway clearance; leave about 30 in of clear floor space in front of the vanity.

Floating vs. freestanding vanities

Floating (wall-mounted) vanities make a small bathroom feel larger and are easy to clean under. Freestanding vanities look like furniture and offer more storage. Floating vanities need a solid wall to anchor into.

Vanity height

Most vanities are 32–36 in tall with the top. Comfort height (about 36 in) is popular for primary baths; vessel sinks add 4–6 in, so pair them with a shorter cabinet.

Choosing a mirror and lighting

Choose a mirror a few inches narrower than the vanity, and mount sconces at roughly eye level (60–66 in from the floor) on either side of the mirror, or a vanity light bar above it.