Abstract: An adjustable, reusable door frame includes in cross-section, a first L-shaped member (C) and a second L-shaped member (G) which overlap sheet rock surfaces (B, BB) of an untrimmed wall opening. The first member has a first projection (D.sub.p) which includes a doorstop extension (C.sub.e) which projection overlaps a second projection (G.sub.p) of the second member. A mounting leg extending projection (D) extends from an inside surface of the first memeber and attaches to a mounting bracket (H). Bracket (H) is attached to a stud (A) which defines an inside face of the untrimmed opening. An attaching bracket (E) extends between the first and second members and is fastened thereto by fasteners. A hinge side assembly includes slotted holes (FF) through which fasteners securing attaching bracket (E) extend. When door hinges are mounted to the hinge side assembly, the fasteners securing the door frame together are covered.