Dryer dimensions vary between manufacturers and models. Many dryers are about 27 inches wide, but differ in their heights and depths. The type of dryer (front-load, top-load, stackable) can have an effect on these dimensions.
When selecting a washer and dryer to fit a laundry room, it is important to measure the space for the appliances themselves and the space where people are going to operate the appliances. The machines should have space on either side for ventilation and room behind them for the hookups. Top-loading machines require space above them as well. It is also wise to leave extra space for future machines of unknown dimensions.