A powder room is a small bathroom, typically under 50 square feet, designed for general use by both occupants of the home and guests. It is generally located on the floor level, close to common locations.
In its most fundamental, a powder room is made up of bathroom and a sink (after allyou don’texpect your visitors to have a shower or tub ). A powder room allows guests to ease themselves and wash their hands.
Compare this with a guest bathroom–for overnight guests–that might be adjoining a guest bedroom, consisting of a toilet, sink, and a bathtub or shower.