There are Audis where you need to remove the front bumper to change the headlamp. (Less of a concern with HID and LEDs, but some of them are still halogen.)

I had one of those, at least according to the repair manual. In that case I found that the local garage were able to change the bulb without dismantling anything by putting the car over their inspection pit and reaching up through a narrow gap between the engine and headlight (having small hands helped here). This was only 5 minutes' work for them and so the charge was very low, and it was easier for me to pay that than to attempt to jack the car up on my driveway and crawl under.