Collection: Bathtub Shower Combo

Two Fixtures, One Footprint: How to Plan a Tub and Shower in the Same Space

A bathtub shower combo puts bathing and showering in the same alcove, served by one valve and one drain. That is the whole appeal. In a bathroom with a single wet area, it is the only layout that keeps both options without stealing floor space from everything else in the room.

The tub and the showerhead get most of the attention, but the parts that decide whether the combo works day to day are the valve, the diverter and the surround. This page covers those. For choosing the tub itself, see our bathtubs range, and for the spray options and trim above it, see the shower systems range.

How the Valve and Diverter Work in a Combo

A combo runs on a tub and shower valve, which is a valve with two outlets instead of one: down to the tub spout and up to the showerhead. A diverter decides which outlet gets the water. That is the entire mechanism, and knowing which type you have tells you what you can buy.

There are two common diverter locations. A spout diverter is the pull-up knob on top of the tub spout; water runs to the tub by default and switches to the head when you lift it, dropping back to tub mode when the water shuts off. A valve diverter is built into the trim on the wall, either as a third handle or as a twist collar on the main handle, and it stays where you set it. Valve diverters feel better and cost more to install; spout diverters are simpler and cheaper to replace.

One detail catches people out. Turning a shower into a combo is never a trim swap. Many pressure-balance valve bodies are sold for either layout and are fitted shower-only with the bottom outlet plugged, so the job means opening the wall to open that outlet and run a drop to the spout. If the valve in your wall genuinely has only one outlet, it has to be replaced outright.

One-Piece and Multi-Piece Units, and Tub Plus Surround

How the walls around the tub are built matters as much as the tub. There are three broad approaches.

• One-piece units. Tub and three walls molded as a single shell with no seams at all. The most watertight option and the standard choice in new construction, but the unit has to physically fit through the doorway, which rules it out in most renovations.
• Multi-piece kits. A tub plus two, three or four wall panels that assemble in place. A 4-piece bathtub shower kit is the common version, and the panels pass through normal doorways. The seams are sealed on site, so installation quality decides how well they hold up.
• Tub with a tiled surround. A standard alcove tub with a waterproofed and tiled wall above it. The most design freedom and the most maintenance, since grout and the joint at the tub deck need attention over time.

Whichever you pick, the tub flange has to be tucked behind the wall surface and the joint between tub and wall sealed with flexible caulk, never grout. That single joint is where most combo leaks start.

The Drawbacks of a Shower Tub Combo

The drawbacks of a shower tub combo are the compromises that come from making one space do two jobs. You step over a tub wall to shower, which is harder on anyone with limited mobility than a low-threshold shower. The showering area is narrower than a dedicated shower, and a standard tub floor is not as sure-footed underfoot as a purpose-built shower base.

Water control is the other trade-off. A curtain or a glass panel has to keep spray inside a tub that was not shaped for standing, and the ledge and the tub-to-wall joint collect water and soap. None of this makes a combo a bad choice, but if the household never takes baths and mobility is a concern, a dedicated shower or a walk-in bathtub may serve better.

Making a Combo Work in a Small Bathroom

In a small bathroom the combo earns its place because the tub footprint and the shower footprint are the same square feet. The standard alcove size of 60 x 30 inches, with 60 x 32 also widely stocked, is what most compact bathrooms are framed around, so a replacement in the same opening avoids moving any plumbing.

A few decisions make a tight combo feel bigger. A clear glass panel instead of a curtain keeps the sight line across the room open. A handheld on a slide bar makes rinsing and cleaning easier where there is no room to step back. A deep tub gains bathing depth without gaining floor area, though it also raises the wall you step over. Recessed shelving in the wet wall stops bottles from taking up the tub ledge. Wall storage does the same job elsewhere in the room, which is where bathroom mirrors with storage earn their place in a tight layout.

Getting the Spray Height and the Spout Right

The showerhead in a combo sits higher than in a dedicated shower because the person under it is standing in a tub, and the spout has to clear the tub rim so the stream lands well inside the tub. Both positions are set during rough-in, before the wall closes, and both are difficult to change afterward, so check the manufacturer's rough-in drawing against the height of the people who will use the bathroom.

Choose the trim, the spout and the diverter as one set from a single line. Mixing manufacturers across a valve, a spout and a head is where finishes fail to match and where parts turn out to be incompatible.