Abstract: A dolly apparatus for door installation transports and facilitates the installation of multiple doors. The apparatus includes a frame. A plurality of wheels is coupled to and extends rearwardly from the frame. A support bracket is coupled to the frame and is configured to support a door thereon. A first guide member is coupled to and extends forwardly from the frame. The first guide member forms a first slot configured to receive a non-hinged side of the door therein. A pair of arms is coupled to the frame. The arms are positioned in spaced parallel relationship relative to each other and extend forwardly from the frame. A plurality of casters is provided and each is configured to contact a ground surface. One of the casters is coupled a first one of the arms. One of the casters is coupled to a second one of the arms.