The average compact washer is 24 inches wide, 22 inches deep and 33 inches high and requires at leas that much space. The average compact dryer is 24 inches wide, 24 inches deep, and 34 inches high.
It is important to note that front loading models need additional space to open the door. Spec sheets from the manufacturer often list the additional space needed, as well as the capacity of the machine. Be sure to buy a machine with enough capacity for your washing or drying needs.
Other space saving options for washers and dryers are available. The best space saving options are combination washer-dryers and stackable washer-dryer units. The combination unit is a single machine that both washes and dries your clothing in the same unit, whereas the stackable unit is a washer stacked on a dryer or vice versa. Stackable units can be purchased as a single unit or can be pieced together by the consumer.
The average dimensions of a combination unit are: 23 inches wide, 22 inches deep and 33 inches high. On the other hand, stackable units sold as a single unit average 27 inches wide, 31 inches deep and 75 inches high. If you intend to create a stacked unit yourself, be sure to buy front loading units with front accessible control panels.