Both Boho and John are right. Side door
mirrors are fairly expensive to begin with,
probably because manufacturers know how
frequently they end up being damaged or
knocked off. That and they are a requirement
in most countries and states in order to pass
annual inspection. That being said, even the
most basic mirrors cost way more than they
should because of this. The more
complicated, heated, power, integrated turn
indicators, tilt down reverse, whatever the
cost increases dramatically. I have a 2012
Nissan Sentra (I'm in the USA) and recently
had a similar situation. It's a basic power unit
that's all. I clipped a left rear taillight with my
passenger side mirror. No damage to my
cover, the mirror or the power feature.
Bought new, the plate (which snapped off as
a pedestrian safety feature) needed to affix
the whole thing back on the door. That plate
with labor to install it was listed at about USD
300.00. Keep in mind this was just to attach
a working mirror to the door. I was lucky as I
knew people and got the whole thing done,
lasts and labor for 135.00 and I needed none
if the mirror parts. Buy used if you can, but
make very sure all needed parts are the right
part number. It's easy to get them mixed up,
and ending with a box full of wing sided
parts. Good luck!