Two people, one sink, and the same ten minutes every morning. Or the reverse: a double vanity with a sliver of counter between the bowls and one sink that mostly collects clutter. Choosing between one sink and two comes down to space, who shares the room, and what you give up to get the second bowl.

Measure the wall first

Space decides more of this than preference does. Planning guidelines from the National Kitchen & Bath Association recommend about 36 inches between the centers of two sinks and about 20 inches from each sink’s center to a side wall or tall cabinet. Laid out between two walls, that’s a little over six feet of vanity.

Double vanities are commonly sold in widths starting around 60 inches, and they work, but the sinks sit close and the counter between them shrinks. If your wall can’t comfortably hold two sinks, one larger sink with counter on both sides often serves two people better than two cramped bowls. Leave room to stand, too, so a door or toilet isn’t crowding the space in front of the vanity.

What a second sink adds and takes away

• It adds room for two people to get ready at once, each with a spot for their own daily things.

• It takes away counter between the sinks and some cabinet storage below, since a second sink and drain use space a drawer bank could have filled.

• It adds upkeep: another basin and faucet to clean, and with the Valley’s hard water, one more faucet base to keep free of mineral rings.

A single vanity flips those trade-offs. You get continuous counter for grooming or makeup and room for a full stack of drawers, at the cost of sharing the sink.

Plumbing, lighting, and outlets

Going from one sink to two usually means adding a drain and supply lines in the wall, and sometimes shifting the existing ones so both sinks are centered. That’s plumbing work for licensed plumbers, evaluated during the in-home consultation, and it’s a different job from swapping a vanity in the same spot.

Depending on the existing pipes, two sinks may tie into one drain in the wall or need separate connections. That detail is confirmed during the consultation rather than assumed.

Lighting changes too. One fixture centered over a single sink doesn’t light two faces well, so a double vanity often calls for light centered over each sink and outlets both people can reach. Whether those are small changes or larger electrical work depends on what’s in the wall now, which the consultation confirms. Our vanities and storage page has more on the cabinet side of the decision.

Matching the vanity to the bathroom

In a primary bathroom shared by two adults on the same schedule, a double vanity is often worth the wall space if the room has it. In a hall bathroom used by kids or guests, a single sink with good storage usually works better, and the counter is more useful than a second bowl. In a small bathroom, a single vanity is nearly always the right call, and the focus shifts to storage that doesn’t crowd the room.

Kids sharing a hall bath are the common exception, since two sinks can keep a busy morning moving if the wall allows it and storage still works. A powder room is the simplest case of all: one sink, often on a compact vanity, and our page on powder room and half bath remodels covers that kind of room.

If you’re planning a suite, see what goes into a primary bathroom remodel. For a shared bath, our page on hall and guest bathroom remodels is the closer fit.

Storage, mirrors, and medicine cabinets

Storage is where a single vanity quietly wins. One sink leaves room for a bank of drawers beside it, and drawers hold more usable things than the space under a sink, which is broken up by the drain and supply lines. With two sinks, each person gets a smaller share of a larger cabinet.

Above the counter, a double vanity usually means two mirrors or one long one. Recessed medicine cabinets can add storage on either setup without using counter space, if the wall allows, and a tall linen cabinet beside a single vanity can make up for a shorter counter.

Resale considerations

Many buyers look for two sinks in a primary bathroom, especially in larger homes, so if your primary bath has the room, a double vanity is a safe choice there. In secondary bathrooms, buyers rarely expect two sinks and tend to notice storage and condition instead. Forcing a double vanity onto a wall that can’t hold it comfortably can work against you, because a cramped layout is obvious the moment someone walks in.

In those secondary rooms, a solid vanity, a durable top, and good lighting say more about the quality of the remodel than a second sink would. Those are the details buyers touch and see first.

How it shows up in the bathroom estimator

The bathroom estimator doesn’t ask you to count sinks. The vanity question asks about level instead: Keep Existing, Standard Replacement, Upgraded Vanity, or Custom Vanity. A long double vanity with a custom top usually leans toward the upgraded or custom answers.

The finish level question matters here as well. A double vanity doubles the faucets, and often the light fixtures and hardware too.

The plumbing question carries the rest. A new single vanity in the same spot fits Keep Existing Locations, adding a second sink usually fits Minor Changes, and moving the vanity to another wall points to Major Changes along with a layout change. If you’re budgeting a larger suite, our primary bathroom remodel cost guide fills in the bigger picture.