A crawlspace access panel assembly for covering a crawlspace accessway opening in a building exterior wall is provided. The crawl space access panel assembly having a substantially rigid panel member adapted to cover the opening and a seal attached around a perimeter of the substantially rigid panel. A number of fasteners connected to the substantially rigid panel for removably fastening the substantially rigid panel to the exterior wall, the fasteners being located only on a minimum number of sides of the substantially rigid panel to stably hold the panel to the exterior wall. When fastened the fasteners only on the minimum number of sides of the substantially rigid panel urge the panel against the exterior wall causing the seal to seat around the perimeter so that the substantially rigid panel seals the opening.