[header] How to lay out a pole barn [title] Decide on the size of your building. [substeps] Consider what you plan to use the building for and how much room you require. Select the height, width and length of the project before laying out a pole barn. 
Make blueprints of the barn or purchase a pre-measured pole barn kit. Every 12 feet (3.66 m) of length needs to have a 4 inch (10.16 cm) by 4 inch (10.16 cm) post as a brace when setting up a pole barn.