Solid Horizon Double Story Site Office is made of light steel as the structure and sandwich panel for wall and roof. The insulation sandwich panel for roof and wall can be polysturene, polyurethane, rock wool and fiber glass. The Double Story Site Office provides easy installation and Long Life. Environment protective, no garbage caused, windows and interior partitions can be flexibly fixed. It has the characteristics of beautiful appearance, different colors for the wall and roof. The double story site office is cost saving and convenient for transportation.