20' X 20' Car Garage Blueprints Project Plans - Design #52020 Roof Style : Gable , Total Sq. Ft : 400 Sq. Ft Building Size : 20' x 20', Overall Height : 12'-10" Wall Height : 8' , Roof Pitch : 5/12 Roof Span : 20' , Side Door : 30" x 82" Overhead Door : 16'W 7'H , Foundation : Slab