As a general rule, a bathroom can hold a tub and shower side by side when the wall they share is long enough for the tub’s length plus the shower’s width, and when the floor in front of both stays open. If either test fails, ask a designer about a tub-shower combination, or a larger shower in place of the tub, before the plan is set.
The pair is fixed by the wall and the floor. Finding out after the plan is drawn that the wall is too short, that no floor is left in front, or that the door and the drains don’t line up means choosing a different pair. That’s a plan rebuilt around two fixtures the room can’t hold.
A Tub and Shower Side by Side Starts With One Long Wall
Side by side means both fixtures sit on the same run of wall. The tub goes in lengthwise, in its alcove. The shower stands beside it, sharing the same wall and the same stretch of floor in front. That arrangement asks two things of a bathroom. The run has to be long enough to carry both fixtures end to end. And the floor has to leave you somewhere to stand when you get out of either one. Miss either test and you’re changing the plan’s shape, not just its finishes.
How long is long enough depends on the tub. According to one bathtub maker’s shopping guide, the average alcove bathtub is usually 60 inches long, and it puts bathtub width at usually 30 or 32 inches. Those are that guide’s figures. Treat them as a starting point for the math. They’re not a size your bathroom has to accept.
The shower side has its own figures. One shower maker’s dimensions page recommends a shower enclosure no smaller than 36 by 34 inches, and it says a shower measuring 48 by 36 inches should offer enough room for one adult to move more easily. Those two numbers bracket a real decision. The width you pick for the shower is width the wall can’t give the tub.
How Much Wall Do the Two Fixtures Need Together?
Add the tub’s length to the shower’s width. On those two makers’ figures, a 60-inch tub beside a 36-inch shower comes to 96 inches, and beside a 48-inch shower to 108 inches. That’s arithmetic, not a rule. The tub guide says tubs are installed to the bare studs, so compare the sum with the bare-stud wall.
That sum is a first test, not a verdict. Whatever sits between the two fixtures adds to it. So can the finish on each wall, and so can a glass panel at the shower. The raw sum shows none of that. It’s also measured to a different wall than the one you can see and touch, because the finished surface sits in front of the framing. Ask your designer to measure bare stud to bare stud, and to work the layout from that number.
A tub length is only one input in that sum. Sizing a single tub to a single alcove is a separate question, and what the standard bathtub size means for your alcove works through it. For the pair, the tub’s length is just the first number you’re adding to the shower’s width.
Is There Floor Left to Step Out Onto?
The floor in front of both fixtures has to stay open. That guide calls a clearance space alongside the bathtub of at least 60 inches long by 30 inches wide best practice for entering and leaving the tub comfortably. So the wall is one measurement. The floor in front of it is another, and it matters as much.
The shower needs its own place to stand when you step out. Where floor is limited, the tub’s landing and the shower’s landing can end up being the same patch of floor. Picture a bathroom where the door opens at the end of the long wall, right where you’d step out of the shower. The sum on that wall can work and the room can still feel wrong. A shared landing is only as long as the room allows. Ask your designer to draw the path in and out of each fixture on the plan, and then walk it on paper.
Sizing the shower on its own is a different exercise, and how big a shower the room can hold covers that ground. The question in front of you is narrower: whether one room can carry both fixtures at once, with floor left over.
What Else Has to Fit Around the Pair?
The door, the drains and the wall between the fixtures all have to fit. As a general rule each fixture has its own drain and its own supply lines, so the floor framing underneath and the wall behind them belong in the plan and not after it. Where those lines run can shape where the pair sits.
Then there’s everything else living on that run. A glass shower door needs room to swing or slide. A bathroom door that opens into the run takes a bite out of the same space. So can a window, or a niche set into the wall between the fixtures. None of it shows up in the sum. Ask where each one lands on the drawing while the drawing can still change.
Bring pictures of the room as it stands. Photos of the walls and the floor help a designer read what’s there, and so does a shot of the bathroom door where it opens. Measurements tell part of the story. Photos tell the rest. Bring both before the plan is drawn rather than after.
When Should You Look at Another Setup?
When the sum runs longer than the wall, or when the floor in front of both can’t stay open, the setup to ask about is a tub-shower combination, or a walk-in shower in the tub’s place. Either one puts a single fixture where two were competing for the same run of wall.
A walk-in shower can also fit the opening you already have. That page gives the average walk-in shower as 60 by 30 inches. Set that beside the tub guide’s 60-inch average alcove tub length and its 30 or 32 inch width, and the two footprints land close together. So a walk-in shower can go where the tub was, in the same alcove, and the run of wall doesn’t have to get any longer. Whether that holds in your bathroom is a question for the designer and the drawing.
Frequently Asked Questions About Fitting a Tub and a Shower
Can a tub and a shower share one wall?
They can, when the wall is long enough for the sum of the tub’s length and the shower’s width. That shared wall can also carry the plumbing for both fixtures, and that’s a reason to put it on the drawing early. Ask your designer to check the wall on the plan before the layout is set.
Is 96 inches enough for a 60-inch tub and a 36-inch shower?
That figure is just the arithmetic of two makers’ numbers added together. Dividers and wall finishes add to it, and so can glass. The tub guide says tubs are installed to the bare studs. So it’s a number to compare with your own bare-stud wall, not a yes or a no. Ask your designer what else is landing between the two fixtures.
Do the tub and the shower have to be the same width?
Neither the tub guide nor the shower page says they do. The tub guide puts bathtub width at usually 30 or 32 inches. The shower page recommends an enclosure no smaller than 36 by 34 inches, so the shorter of those two sides is 34 inches. Those two sides may not line up against the same wall. Ask your designer how the line between the two fixtures will be framed.
What if the bathroom already has a tub-shower combination?
Then the alcove holding that combination is your first measurement. It tells you what the wall already gives. Whether a second fixture can join it depends on the room beyond that alcove, and on what sits past the end of the tub. Ask your designer to measure the whole bathroom, not just the alcove. Whether a wall can move isn’t something to assume; that’s a question for the plan.
Can Solstice help me work out whether both will fit?
Solstice’s designers take time to understand how you use your bathroom day to day and create a plan that optimizes comfort, function and style, so whether both fit is a fair question to raise with them. Bring the room’s measurements and a few photos when you reach out to the team, and the conversation can start with the room as it is.
Settle the Pair With the Room Plan
Solstice’s bathroom design process starts with how you use the bathroom day to day: the designers build a plan for comfort, function and style, and once the design is set, the installation and project management team carries it out.
If you’re picturing a tub and shower side by side, measure the bare-stud wall, sketch the floor in front of each fixture, and then contact Solstice about your bathroom project so the pair is settled on the plan before any wall is opened.
