Floating Vanity Dimensions: Sizes That Actually Fit

Four measurements define a floating vanity, and most people only think about one. Width is the obvious dimension and the one everybody starts with. Depth decides whether the door still swings and whether the room still feels walkable. Cabinet height plus countertop thickness sets your finished counter height. And the clearance underneath, the whole point of a floating design, determines how the room reads and how easily it cleans. Here is how to size all four to a real bathroom rather than to a spec sheet.

The Four Measurements

These are the ranges we actually build in our Chicago shop, not generic industry figures. If a size you need sits outside them, that is a custom order, which is normal work for us.

Width: Sizing to the Room, Not the Wall

The available wall length is the ceiling, not the target. A vanity cut to the exact measured wall length in an older bathroom usually does not fit, because walls are rarely square and corners rarely true. Beyond that:

• Leave enough clearance in front of the vanity to stand and use it comfortably, and check that the bathroom door and any shower door still swing through their full path.
• Keep breathing room between the vanity and adjacent walls, toilets and tubs. A cabinet jammed wall to wall looks like a mistake even when it measures correctly.
• The widest cabinet that fits is often not the right choice. A slightly narrower vanity with space around it reads intentional and cleans easier.
• Two sinks genuinely work once you reach the wider end of the range. Our double sink vanities start at 60 inches wide for a reason: below that, two basins crowd each other and neither is usable on a daily basis.

Rough guidance by room: a powder room usually takes 24 to 30 inches, a small full bath 30 to 42 inches, and a primary bath 60 inches and up where a double sink starts to make sense. The section on sizing by bathroom type below goes deeper.

Depth: The Dimension That Causes Regret

Depth is the trade-off nobody photographs. A deeper cabinet gives you more counter, more storage and better sink options. A shallower one preserves walking space. We build floating vanities at 19.5, 21 and 22 inches deep, with the double sink models at 22 inches, because below roughly 19 inches the basin and plumbing start dictating design rather than the other way around.

In a narrow bathroom, depth is usually the constraint that actually matters, not width. A vanity that fits the wall perfectly can still make the room feel like a hallway if it projects too far into it. And a depth that looked fine on paper can block a door swing or a shower door path. Measure the projection into the room, then walk the door swings before you commit.

Cabinet Height vs Finished Counter Height

These are two different numbers and mixing them up is the most common sizing mistake. The cabinet body is the box itself: our floating vanities run 20 to 22 inches of body height. Your finished counter height is the body, plus the countertop thickness, plus whatever mounting height you choose on the wall. The box is fixed; the finished height is a decision you make at install. For the full breakdown of finished heights and who they suit, see our guide to floating vanity height.

Clearance Underneath

The gap under the cabinet is what you are buying with a floating design. The floor runs continuous to the wall, so the room reads larger than it is. Cleaning underneath is trivial: mop, done. In accessible bathrooms the clearance is functional rather than decorative, allowing approach space that a toekick cabinet cannot.

One thing to understand: mounting height and counter height are linked. Raise the cabinet to increase the visual gap and the counter rises with it. Decide your finished counter height first, and let the clearance land where it lands. If you need both a specific counter height and a specific gap, that is a conversation about cabinet body height, which we can adjust because we cut to order.

Sizing by Bathroom Type

Powder room (24 to 30 inches). The room is small and the door swing is usually the enemy. A compact floating vanity at a shallower depth keeps the room walkable, and the visible floor underneath makes a small room feel less cramped.

Small full bathroom (30 to 42 inches). Enough width for a proper basin and usable storage without crowding the toilet or the tub edge. Watch the projection into the room more than the width.

Standard family bathroom (42 to 60 inches). Room for real storage and counter on both sides of the sink. At the top of this range you approach double sink territory.

Primary bathroom (60 to 84 inches). This is where two sinks genuinely work, with usable counter between and beside them. Our Floating Vanity Double Sink models run 60 to 84 inches wide at 22 inches deep for exactly this reason.

Measuring Your Space Properly

Before you request a quote, take five measurements:

• Wall length available, measured at vanity height rather than at the floor, because baseboards and tile wainscot lie about the usable width
• Distance to adjacent fixtures and walls at vanity depth, not just at floor level
• Door and shower door swing paths, with the door actually opened through its full arc
• Rough-in location for the drain and supply lines
• Whether the walls are square. Older bathrooms often are not, and a cabinet cut to the exact wall length will not fit an out-of-square corner

When Standard Sizes Do Not Fit

Because every piece is cut to order in our Chicago shop rather than pulled from a container, non-standard widths and depths are normal work for us, not an exception. To quote a custom size we need the wall measurement, the depth you want the cabinet to project, your target counter height, and the rough-in location. Photos of the space help more than anything else. Browse the Floating Vanity range for a starting point, or the Standing Vanity line if a floor cabinet suits the room better, and send us what you are working with.

Once the size is settled, our guide on how to install a floating vanity covers what the wall needs before the cabinet arrives.

Frequently Asked Questions

What are standard floating vanity dimensions?

There is no single standard, but the ranges we build cover most bathrooms: 24 to 84 inches wide, 19.5 to 22 inches deep, with a 20 to 22 inch cabinet body. Double sink models run 60 to 84 inches wide. Clearance underneath is a mounting decision made at install, not a factory dimension.

What size vanity fits a small bathroom?

For a powder room, 24 to 30 inches wide at the shallower end of the depth range keeps the room walkable. For a small full bath, 30 to 42 inches wide works in most layouts. In tight rooms, depth matters more than width: a shallower cabinet preserves floor space and door swings.

How wide does a vanity need to be for two sinks?

Plan on 60 inches as the practical minimum. Below that, two basins crowd each other and neither is comfortable for daily use. At 72 to 84 inches you get usable counter between and beside both sinks.

How deep should a bathroom vanity be?

Most floating vanities we build run 19.5 to 22 inches deep. Go deeper for more counter and storage where the room allows; go shallower in narrow bathrooms where walking space and door swings are the constraint.

How much clearance should be under a floating vanity?

The gap is set by where you mount the cabinet, so it follows your target counter height rather than the other way around. Decide the finished counter height first and let the clearance land where it lands.

Can I get a custom size?

Yes. Because the cabinets are cut to order in our Chicago shop, non-standard widths and depths are possible. Send the wall measurement, the depth you want, your target counter height and the rough-in location, and we will quote it.