A bathroom must be at least 15 square feet in size. The smallest total amount of space is needed to accommodate the distances between the sink and toilet as well as the floor and ceiling. A powder room or half-bath are other names for a toilet room.
To allow for safe and comfortable use, the International Residential Code, or IRC, mandates that a specific amount of clear space be left between fixtures. The doorway must be at least 34 inches wide, which is sufficient room for a door that is at least 2 feet, 10 inches tall. The minimum width of the room must be 30 inches at its narrowest point in order to meet the code’s requirement of 15 inches of side-to-side clearance from the toilet’s centerline to the wall.
The distance between the front edge of any fixture, such as a toilet, sink, or bidet, and the wall must be at least 30 inches. A minimum of 21 inches must be available for standing space in front of the sink. The room must be at least 52 inches long to meet these specifications. The toilet must be at least 80 inches above the ceiling.
A small toilet room can appear larger by using compact toilets and small-scale sinks. To give the appearance of a larger room, add large mirrors. Before starting a bathroom renovation or any other home improvement project, check the local building codes.