American wood frame stucco.

To be clear, if I do the work myself, I would likely renovate the existing problematic bathroom. I would try to do a curbless design out of concrete or a wedi kit, but I am not sure yet if I have enough area for curbless. I would add a shoulder height wall and try to avoid having a door or curtains for the shower stall.

If I hire a contractor, I guess I will consider the house extension since the costs are crazy anyway, in which case I would simply abandon the existing shower until I figure out later what to do with it.