Three rooms can also be changed into four rooms. Description: This plan changes the structure on the basis of the original building, making the original three rooms and two halls into four rooms and two halls. The specific method is to change the hat room of the original master room into the main bathroom, and the original kitchen and public bathroom are shifted to the dining room, so the left space can be changed into a bedroom. Although it will be difficult to change the bathroom during construction, it will not affect at all as long as the slope of the sewage pipe is kept good.