Our son's 10 and we've always lived with just one bathroom, which has everything in it - no separate toilet, and shower's over the bath in the same room. But I'm beginning to wonder if this is going to be sustainable as we get into teen years - we tolerate each other's interruptions or quite often have the door open at the moment. It's a big room so I guess we could separate off the toilet. Has anyone else managed this? There isn't an obvious place to squeeze another toilet in.