This 40′ W x 80′ L x 12′ H features (3) 10′ W x 10′ H roll-up doors on the eave side and (1) 36″x80″ walk in door. We can install on any kind of surface which could be ground, gravel, concrete, asphalt, or wood. You would have to provide the installers with a lull lift so they can erect the building on site. This unit will also come with a FREE set of blueprints for permits if needed.