The post bracket of this invention is for use in constructing post frame buildings. The post bracket has a first side plate, a second side plate, a back plate, and may have a front catch plate. The catch plate is located between the first and second side plates. The bracket fits over a subgrade post to form a subgrade post assembly. The subgrade post assemblies extend into the ground and are initially supported upon and attached to skirt boards which outline the foot print for the building. The subgrade posts are anchored in the ground. After the posts are anchored in the ground, upper posts are placed in and pivotally engaged in the post brackets. Adjacent posts are attached to each other to form a wall section. The wall section is then pivoted upward by pivoting the upper posts in the brackets.