Standard rough-in dimensions: toilet — drain center 12″ from finished wall, cold supply 6″ off-center left at 8″ above floor. Bathroom sink — drain center 16–20″ above floor, hot supply left and cold supply right, both 4″ off drain center line at 21″ height. Shower valve — center 48″ above shower floor; showerhead stub-out 72–80″ above shower floor. Bathtub — drain center 14–15″ from end wall, overflow 16″ above drain center. Laundry — washer box at 42″, standpipe 36–42″ height with 2″ minimum diameter. Always verify against specific fixture manufacturer rough-in sheets — dimensions vary by product.