Automobile body shop, referred to as “auto body shop,” includes any establishment, garage, or work area enclosed within a building where repairs are made or caused to be made to motor vehicle bodies, including fenders, bumpers, chassis, and similar components of motor vehicle bodies as distinguished from the seats, motor, transmission, and other accessories for propulsion and general running gear of motor vehicles, except as provided in § 5-38-20. No repairs performed by licensees under this chapter may be performed using mobile units, but may only be performed at a fixed, licensed location. This section shall not apply to glass repair and installations or paintless dent repairs.