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Bathroom vanity sizes

Standard widths are 24, 30, 36, 48, 60, 72 and 84 inches, at 21–22 in deep (18–20 in for a shallow cabinet) and 32–36 in high. 30 in is the most common single-sink size; doubles start sensibly at 60 in. Across the 59 cabinets we track, the median works out to $10.97 per inch of width — and that figure barely moves between the smallest and largest sizes.

Standard sizes

WidthFitsSinksDepthMedian $/inCheapest $/in
24 inPowder room, small half-bathSingle18–21 in$11.66$11.38
30 inSmall full bathSingle21–22 in$10.93$9.97
36 inStandard full bathSingle21–22 in$10.83$10.69
48 inLarge single or tight doubleSingle, or double at a squeeze21–22 in$11.04$10.94
60 inPrimary bathDouble21–22 in$11.17$11.08
72 inLarge primary bathDouble21–22 in$10.97$10.90
84 inVery large primary bathDouble21–22 in$10.71$10.65
  • 24 in: Smallest size with usable drawer space below.
  • 30 in: The most common single-sink size in US homes.
  • 36 in: Single basin with counter space either side.
  • 48 in: A double at 48 in leaves almost no counter — most people prefer a wide single.
  • 60 in: The usual minimum for a comfortable double vanity.
  • 72 in: Room for two basins plus drawer banks between them.
  • 84 in: Usually built as two cabinets joined by a shared counter.
  • Prices are live cost per inch of width, re-checked on a rolling cycle. A dash means no tracked cabinet at that width today.

Width is priced flat — features are not

Most categories reward buying bigger: a 145-pint dehumidifier costs a third less per pint than a 70-pint, and a 40 ft cable is 26% cheaper per foot than a 21 ft. Vanities do not work that way. From 24 to 84 inches the median cost per inch moves about 9%, so the size decision is purely about what fits.

The spread that matters is inside a single width, where identical-size cabinets differ by up to 1.9x. The driver is ADA roll-under clearance — see ADA vs standard vanities for what that costs, or the full cost-per-inch guide.

Cheapest per inch right now

Ranked by real cost per inch of width

Frequently asked

What are standard bathroom vanity sizes?

Widths run 24, 30, 36, 48, 60, 72 and 84 inches. 24 in suits a powder room, 30 in is the most common single-sink size in US homes, 36 in is the standard full bath, and doubles start sensibly at 60 in — a 48 in double leaves almost no counter. Depth is usually 21–22 in for a full-depth cabinet or 18–20 in for a shallow one, and height is 32–36 in, with the taller end sold as comfort height.

What size vanity do I need?

Measure the wall opening and subtract clearance: leave at least 4 in between the cabinet and a side wall or door casing, and check that a swinging door or shower door does not foul the drawers. Then confirm the plumbing rough-in lands within the cabinet, because moving supply lines and a drain is the expensive part of a swap.

Does a bigger vanity cost less per inch?

Barely, which surprises people who expect bulk pricing. Across the cabinets we track the median runs about $11.66 per inch at 24 in and $10.68 at 84 in — a 9% span over a 3.5x range of sizes. Width is close to linearly priced, so the comparison that saves money is between cabinets of the same width, not across sizes.

Why do two vanities of the same width differ so much in price?

Features, not size. At 30 inches the catalog runs from about $9.97 to $19.30 per inch — a 1.9x difference for cabinets that fit the identical opening. The single biggest driver is ADA compliance: roll-under cabinets average about 63% more per inch, because the clearance forces a shallow basin, an offset trap and wall mounting. Wall mounting on its own carries no premium.

What depth should a bathroom vanity be?

A full-depth cabinet is 21–22 in, which is what most standard basins are built for. Shallow cabinets at 18–20 in exist for narrow bathrooms and hallway powder rooms; they buy back walking space at the cost of drawer depth and basin size. Depth also determines whether a door or shower swing clears the front of the cabinet.