Bathroom remodeling in South Dakota is an indoor job in a state that keeps the windows shut. Wind makes people seal the house, and a weak fan then leaves the shower in the attic. That attic is the same volume a lifted shingle is trying to wet from the outside. The bath and the roof are different trades. They meet if the duct does not leave the building. Find the end of the duct before you pick tile.
Small-town baths and farmhouse baths are usually tight, with a valve full of mineral and a surround that was caulked instead of rebuilt. Wells and hard water are common off the city systems. Scale on glass is not a waterproofing plan. Ask what substrate goes behind the new walls, whether the alcove is square, and how the floor slopes to the drain. A prefabricated base and a tiled shower fail in different places.
Layout is the drain and the stack, not a picture saved on a phone. Swapping a tub in the same alcove is one scope. Moving the toilet or the doorway means the joists get a vote. If wind-driven rain has already stained the wall around a bath window, fix that path before the finish goes up. Tile over a damp stud bay will mark itself. Say so if the exterior wall is part of the mess.
Humidity is lower on the west river and still absolute inside a shower. The fan has to exhaust outdoors either way. Recirculating air is noise. While the ceiling is open, do not vent into an attic you are trying to keep dry against the next sideways rain. If the only full bath is upstairs and the laundry is below, say that. Access changes the order of the work more than the color of the fixture.
Say tub, shower, or the whole room, and whether the layout stays. Name the town and whether a wind leak has wet the same corner. You do not need a finished drawing. You need the floor the bath is on and the thing that has stopped working. Call the number on this page.