A door assembly is provided that includes integral impact regions that obviate the need for a separate impact beam. The door assembly includes an outer panel and an inner panel, operably connected to the outer panel so that a compartment is formed therebetween. At least one hardware-mounting surface is integrally formed from the inner panel and extends towards the outer panel. Each of the hardware mounting surfaces is operable to mount a hardware component between the inner and outer panels. At least one integrally-formed impact region is provided on the inner panel that is operable to strengthen the door assembly and increase its intrusion resistance of the vehicle door during a collision. The inner panel has substantially no large access openings that would be deleterious to impact resistance and substantially seals the vehicle passenger compartment from the external environment. The at least one impact region is also displaced at least as far away from the outer panel as the at least one hardware mounting surface.