Replacing a misted unit

[wallet375]

Good Afternoon Guys & Girls, been lurking on here a while and cant find anyone with a similar problem, anyway here goes, can anyone tell me how to take out and replace a sealed double glazed unit in a upvc window.

The beading looks like it is outside which i think is a security risk surely?

The first pic is from inside (btw there is wooden shutters fitted right next to them) if its too much agg maybe someone can give me a approximate cost to let the experts do it, i have no idea what to expect, thanks all for your advice guys

 

[Tigercubrider]

A few years ago (5?) my window broke on the outside pane.
I rang the company that installed it and they made and installed a new unit from their original documents, so only one visit.
From memory it was only £50 for a fitted unit about 50x100 cm

 

[Tally101]

Just had a bedroom window replaced as it was misted, ring a local window supplier like I did. cost was £80

 

[lonner]

Well my 20 odd yr old windows are proving to be bastid
External beading.

I've now bought 2units Twice.
First 2 18mm ,my mistake as I ordered air gap..as I remember them being 18mm.
Well £80 wasted.
Ordered 28mm ...feck me these are 2mm too thick and won't work either.

I give up, fook the windows