Whether you ding it in a tight construction zone, or knock it off parking too close to the garage wall, car wing mirrors are easily damaged. Wing mirrors are required by law, so you will need to repair the mirror. You could take it to the dealership and pay anywhere from £130 to £325, or you could do the repair yourself for nothing but the cost of the mirror and some tools.
Order a replacement mirror from the dealership or find an aftermarket mirror and paint it yourself.
Slide the panel remover lever under the mirror panel inside your car. This is the triangular panel next to the window.
Pop off the screw covers located just below the mirror panel with a hooked pick and pop off the door handle cover with the same tool.
Remove the screws holding the door panel in place with a socket wrench. Put these screws in a safe place to avoid losing them.
Pull off the trim at the top of the door panel with the trim pad remover.
Pop off the door panel with the panel remover lever.
Remove the three screws holding the old mirror in place with a screwdriver, or if nuts are used, with a socket wrench.
Disconnect the old mirror's electrical connection and pull out the mirror.
Insert the new mirror into the three holes and screw it into place.
Connect the new mirror to the old electrical connector and press the control buttons to make sure that the mirror works.
Place the door panel back into position and press the trim back into the top of the panel. Screw the panel back into place and replace all the screw and panel covers.