A vertical space of 14′, measured from the ground to the top of the building when it is on the trailer, is required. Be sure to take any tree branches and utility wires into account. While our drivers are very skilled with a Mule, he will still need a minimum of 1′ of space to maneuver the building through an opening. That is, a building 12′ wide will require a 14-foot wide space (1 foot on each side).