To my knowledge, there is no "standardized wrestling practice room?"

There are requirements established by the National Federation of High Schools regarding wrestling mat size, maximum wrestling room temperature, and several other suggestions regarding sanitation and cleanliness of the mats and mat area.

The size of the room is dependant on the number of participants at a particular school and facilities availability. If there are consistently a large number of participants and a small practice facility, it is the responsibility of the administration at the school to provide appropriate and safe facilities.