adding washer and dryer to existing bathroom
I have a bath with a separate tub and stand alone fiberglass shower. The size of laundry appliances has increased enough since my house was built in 1983 that they don't fit in my laundry room (they block the exterior door by a couple of inches). I have king size sheets, etc. so can't get a compact machine (or would have to do 5 or 6 loads of laundry each time I change my bed linens).
I'm thinking of adding a shower to the tub alcove and putting the w/d where the shower is now. Lots of space for a stackable.
But I just read on the bath forum that the pipe size from the source might not be adequate to plumb in a w/d in the bathroom. Could that be true? No one will be showering and running washer at the same time (I live alone and shower in master bath, so it is only an occasional guest using this bath). Would I really have to replumb all the way from the ??? wherever the water comes in, I guess? Or from the hot water heater, I guess they mean?
What about drain size? Could the former shower drain pipes handle a washing machine discharge?
Thanks for your expertise!