I don't know your car but my Golf has suffered electric window problems on both front doors...
Behind the interior trim panel is the winding mechanism that lifts the window up and down - on my car it's on a metal panel with access holes to get to the clamps for the glass. The motor is a separate item screwed to the panel.
The winding gear (no motor - no glass) cost me just under £50 each time I needed to make a repair - I engaged the services of a travelling car locksmith to do the work - another £50.
The front radio speakers are pop-rivitted to the winding mechanism panel on my Golf and they had to be drilled out and rivitted back onto the new panels.
Your car will obviously be different but I suspect you will need to fit a new winding mechanism and the costs will probably be very similar.
Good luck...
Peccavi
April 2009