An adjustable joist hanger including a mounting foot having a substantially planar lower abutment surface, the mounting foot having at least one attachment opening to attach the mounting foot relative to a surface and at least one, at least partially threaded member extending therefrom, a substantially U-shaped joist carrier adapted to receive a portion of a joist and mounted for movement relative to the at least one, at least partially threaded member and an adjustment mechanism for adjusting the joist carrier relative to the mounting foot.