A 36" high post trim is standard for our 4 beam deluxe vinyl pergola. The post trim is made from the same heavy duty vinyl as the rest of the pergola, and measures 8" square at the top and 10" square on the base trim. You may also choose to not have the post bases. Please note that if you include privacy panels, lattice or walls, the post bases may not be able to be used. Be sure to talk to a project advisor for details.