Decoration generally need floor drain and angle valve, how many ah, 2014
Floor drain, bathrooms generally need two, dry and wet area, balcony if used, you can also install, the kitchen can also look at individuals. Angle valve, kitchen hot and cold water two, bath hot and cold water two, basin head two.
A total of five will be fine. Of course, ha ha, you see that place is uncomfortable, you can also add more. In addition, floor drain, balcony, a bathroom, and some are two, a kitchen (some have, some do not have), the main thing you still see your room layout, where there is a sewer, you need to add floor drain
First say angle valve, kitchen hot and cold water two, bathroom, washbasin, hot and cold water two, toilet water into one.