Sometimes. It depends almost entirely on which way the joists run, and that takes four minutes to establish from the room below.
Why a curbless shower needs the floor opened
Curbless means there is nothing to step over. To get there, the shower floor has to sit lower than the surrounding bathroom floor so water runs to the drain instead of out into the room. That means dropping the drain and the trap below the level of the floor structure.
On a main floor with a basement underneath, there is a joist cavity to work in and the ceiling below is usually unfinished. Straightforward.
Upstairs, that same cavity is somebody’s living room ceiling.
The question that decides it
Which direction do the joists run relative to the plumbing wall?
If they run perpendicular to it, the drain can usually be routed between two joists without cutting anything structural. That is the good case.
If they run parallel to the plumbing wall, there is nowhere for the drain to go without notching or cutting a joist. Cutting a joist is a structural alteration. That means an engineer’s drawing, a building permit, and often steel or an LVL header. The cost roughly triples and the timeline goes with it.
Four minutes with a flashlight
From the room below, look at the ceiling and work out which way the framing runs. If the ceiling is finished, the direction of any visible seams or the way a light fixture is mounted usually gives it away. This is the first thing we check at an assessment, before anyone measures the bathroom itself.
The ceiling below
Even in the good case, an upstairs curbless shower means opening the ceiling underneath to run the drain, then repairing it. Drywall, taping, sanding, priming, painting, and matching whatever texture is already there.
Add three to four days to the schedule for that alone. And insist it is priced explicitly rather than described as making good, because a repaired ceiling in the middle of a living room is very visible.
Ask this before signing anything
“Is the ceiling repair below included in this price, and does that include painting the whole ceiling or just the patch?” A patch that does not match is worse than no patch, and painting a full room ceiling is a real cost that is easy to leave out of a quote.
What we usually recommend upstairs
A low-step walk-in shower. The tub comes out, a sealed one-piece shower floor goes into the same alcove, and the existing drain position is kept. Nothing structural, nothing in the ceiling below, four working days.
The step is shallow — an inch or two rather than the sixteen or so she is climbing over now. For someone walking unaided or with a cane, that is the difference between dangerous and manageable.
For a wheelchair user, it is not enough, and then the conversation is genuinely about whether the upstairs bathroom is the right room at all. Sometimes the honest answer is a new three-piece bathroom on the main floor instead.
Tell us where the bathroom is
The free check asks whether the bathroom is over a basement, on a slab, or upstairs, and flags what that means before you get attached to an idea.