Geoff Wells, bathroom planning expert for Dolphin Bathrooms, comments:

“There certainly is no maximum size. In terms of limitations it is largely dictated by the walls of the bathroom and factors such as being able to drain waste away and the accessibility to clean the room. If you are worried then it is always best to enlist the help of a professional such as Dolphin, who will make sure every step of the process is taken care of from start to finishing touch.”