Smallest Reasonable Dimensions for a Full Bathroom

Single-Sink Bathroom

A small, standard, full bathroom is normally rectangular shaped and at least about 5 by 7 feet. It has a toilet and also contains a bathtub and shower combination or just a walk-in shower. The sink is mounted with a vanity or stands alone on a pedestal. A larger size standard bathroom might have room for two sinks. Vanities have doors and drawers for storage space of personal and bath items. Standard bathrooms are used by guests as well as family members.

Double-Sink Bathroom

A vanity with a double sink increases the room's necessary size to slightly more than the size that a small standard bathroom requires. The smallest reasonable dimensions for a bathroom with a double sink vanity are 7 by 9 feet.

Master Bathroom

A master bathroom is connected to the main bedroom and is generally not used by guests. The average size of the master bathroom varies according to the accommodations, but it often is 100 square feet or greater. Double sinks are often included in a master bathroom, and they provide extra storage room below the vanity. The toilet often is located in an adjoining room that is considered part of the bathroom's square footage. Besides a shower, the room most likely includes a large bathtub or a whirlpool.

Bathroom Planning

The standard bathtub size is 60 inches long and 30 or 32 inches wide. Many bathrooms are designed to fit the tub against three walls. The sink or vanity top's height depends on the home's occupants. The standard height is 30 to 34 inches from the floor. Taller people can accommodate their personal needs by raising the height to their comfort level. To relieve the feeling of a cramped bathroom, consider a smaller bathtub and toilet to create more floor space.