Bathtubs in depthExploring

Bathtub Types: Alcove, Drop-In, Undermount, Freestanding and Corner

By the JDI Construction teamReviewed by Arthur Kulchitskiy, Project Consultant, and Denise Lacquement, Designer (bathroom specialist)Updated October 20265 min read

Quick answer

An alcove tub, set between three walls with a tiled surround, is the most space-efficient and usually the lowest-cost choice, and it doubles as a shower. Drop-in and undermount tubs sit in a built deck and suit larger rooms. A freestanding tub needs open floor space on all sides. Corner tubs fill an otherwise awkward corner but use more floor and water.

Bathtubs are sorted by how they are installed, not by what they are made of. The installation type decides how much floor the tub takes, what has to be built around it, whether it can also serve as a shower and how hard it is to clean. Material is a separate choice, covered on our bathtub materials page. This page compares the five installation types side by side.

The five tub types at a glance

Type	How it is installed	Space it needs	Works as a shower	Cleaning	Relative cost (tub and install)
Alcove	Three walls; finished apron on the open side; tile or panels on the walls	Least. Fits the common hall-bath footprint.	Yes, the usual tub-shower combo	Easy; one caulk line along the walls	Lower
Drop-in	Rimmed tub lowered into a built deck or platform	More; the deck adds width on every exposed side	Possible, but less common	More work; rim joint and deck surface	Mid
Undermount	Rimless tub set beneath a stone or solid surface deck	Like a drop-in	Rarely	Deck wipes straight into the tub	Higher; deck material and fabrication add cost
Freestanding	Stands alone on the floor; finished on all sides	Most; clear floor all around it	Not practical	Tub is easy; the floor behind it is not	Mid to highest
Corner	Fits a corner, as an alcove-style or deck-mounted unit	A large triangle of floor	Some models	Moderate	Mid to higher

Alcove tubs

An alcove tub sits in a three-sided recess, with a finished front panel called the apron. It is the standard hall-bath tub, and the most efficient use of space because the walls do the work. Most alcove tubs have a flange along the back and ends that turns up behind the wall finish. That flange, lapped correctly under the waterproofing, is what keeps water from running behind the tub.

Drain hand. The drain is at one end. The tub is ordered left-hand or right-hand to suit, and it must match the plumbing or the drain and valve have to move.
Shower use. With a showerhead and either a curtain or a glass enclosure, it becomes a tub-shower combo. Glass panels at a tub are a safety-glazing location; see safety glass rules for shower doors and tub enclosures.
Walls. The walls above the tub need a waterproof surface. Tile over a waterproofed backer, or solid panels, are the usual choices.

We have more on this type in our blog post on alcove tubs.

Drop-in tubs

A drop-in tub has a finished rim that rests on a built deck. The tub itself is plain on the outside because the deck hides it. That makes drop-ins a way to get a large or deep tub, including jetted models, with a tiled or stone surround that matches the rest of the room.

The deck is a small construction project of its own: framing, a waterproofed top, tile or stone, and an access panel if the tub has a pump. The wider the deck, the more room it takes, and a deck that is too wide makes it hard to step in. A deck on the far side also becomes a place for bottles and candles, which some people want and some people end up cleaning around.

Undermount tubs

An undermount tub is installed from below, so the deck material overlaps the tub's edge. The result looks like a kitchen undermount sink: a clean line and no rim to collect grime. It needs a deck material that can be cut and finished at the edge, usually stone, quartz or solid surface, and careful support, since the tub hangs under the deck's opening. It is a higher-cost detail, chosen for looks and easy wipe-down.

Freestanding tubs

A freestanding tub is finished on every side and stands on the floor, on feet or on a solid base. It is the centerpiece choice in a primary bath. It also has the most planning behind it: open floor around the tub, a drain and faucet location fixed in the floor or wall, and a floor that can carry the filled weight. Heavier materials can need the framing checked. Our freestanding tubs page covers clearances, faucet mounting and floor loads in detail.

Corner tubs

Corner tubs fill a corner with a triangular or rounded shape. They were a common feature of large primary baths in past decades, many of them jetted. They use more floor than an alcove tub, usually hold more water, and the deep reach across the corner can make cleaning awkward. In a remodel they are often replaced with a larger shower and a smaller tub, or no tub at all.

Other things that vary by type

Soaking depth. Any type can be deep. Depth is set by the height of the overflow, not the tub wall. See soaking, whirlpool and air tubs.
Jets. Whirlpool and air systems are most common in drop-in and alcove models because the pump or blower needs a hidden place to live with access for service. Jetted tubs are covered by their own standard, ASME A112.19.7/CSA B45.10.
Access. Stepping over a tub wall is the main barrier for anyone with limited mobility. A lower tub wall, a grab bar and a handheld shower help. Our aging-in-place bathroom page goes further.

What to check before you buy

The finished opening or floor space, measured after any wall work, against the tub's outside dimensions and flange.
Drain end and drain location, compared with the existing drain. Moving a tub drain is real plumbing work; see moving a toilet, shower or sink.
Overflow height, which sets real water depth, and the interior length at the bottom, which sets how you actually lie in it.
The standard the tub is made to. Enameled cast iron and steel tubs are made to ASME A112.19.1/CSA B45.2; acrylic and other plastic tubs to CSA B45.5/IAPMO Z124. The spec sheet should name it.
The route into the room. Measure doors, stair turns and hallway corners, especially for a one-piece tub.
Valve and faucet compatibility, including where the spout lands relative to the overflow.
Whether a pump or blower needs an access panel, and where it will go.

Who should choose which

A hall or kids' bath that also needs a shower: an alcove tub. Nothing else fits a tub and a shower into the same footprint as well. See hall and kids' bathrooms.
A primary bath with room, where the tub is for soaking: a freestanding tub if you want it as a focal point, or an undermount tub if you want a deck for a seat and easy cleaning.
A deep or jetted tub with a tiled surround: a drop-in.
A corner that would otherwise go unused: a corner tub, if you will actually fill it.
Nobody bathes: consider whether you need this tub at all. Our page on whether to keep a bathtub weighs that decision.

JDI Construction's designers confirm the tub, drain end and valve together before anything is ordered, so the tub that arrives fits the opening and the plumbing. To talk through a tub in your bathroom, start with bathroom remodeling in Vancouver, WA.

Common questions

What does left-hand or right-hand drain mean on an alcove tub?

It describes which end the drain is on when you stand facing the tub's open side. An alcove tub with a finished apron only works one way, so the drain end has to match where the existing drain and valve are, or the plumbing has to move. Check this before you order, because a wrong-hand tub cannot be turned around.

Can a new tub go into the same space as my old one?

Often, but measure the finished opening between the walls, not the old tub. Older alcoves were framed to sizes that do not always match current tubs, and some older tubs were set before the walls were finished. Your contractor should open the wall or floor enough to confirm the drain location before the new tub is ordered.

Is a drop-in tub harder to clean than an alcove tub?

The tub itself is not, but the deck around it adds a surface and a joint to keep clean. Water left on a tiled deck sits on grout, and the caulk joint where the rim meets the deck needs attention. An undermount tub avoids the rim edge on top, so the deck can be wiped straight into the tub.

Do corner tubs make sense in a small bathroom?

Rarely. A corner tub takes a large triangle of floor and tends to hold more water than a standard alcove tub, so it fills more slowly and uses more hot water. In a small bath, an alcove tub or a shower usually gives more usable room.

Sources

Checked October 2026. Rules, fees and programs change; confirm the current requirement with the agency before you rely on it.