A vehicle door assembly includes an outer door panel that is fixed to an outer periphery of an inner door panel such that the inner door panel and the outer door panel define a door cavity therebetween. A support bracket is attached to a forward area of the inner door panel within the door cavity. A reinforcing panel is attached to the support bracket within the door cavity. A window opening support panel is attached to the support bracket, the reinforcing panel and the inner door panel within the door cavity. A side view mirror is located along an exterior side of the outer door panel. The side view mirror includes at least one fastener that extends through the window opening support panel and the reinforcing panel thereby attaching the side view mirror thereto.