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Wickes show 24mm thick glazing 70mm profile. Giving 1.4Watts/sqm
28mm has been "the standard" thickness for a fair while and 1.4W/sqm is rather poor for a new install.
90mm thick window frames aren't uncommon now and warm edge spacers between the glass panes with argon fill doesn't cost any more than aluminium spacer.
Even with 70mm frames, the number of internal boxes varies between cheap and decent profiles so you do get what you pay for (to a point). The problem being they mostly look the same from the outside.Theres some good info here.
https://aspirebifolds.co.uk/2018/03/what-are-typical-u-values-on-windows-and-doors/Still £5k can >>>>>
user69121-
The Wickes windows aren't really comparable in lots of other ways anyway. Eg no fitting, no structural bits (this is a bay window and needs things in the corner to hold up the roof above) etc. I always knew it would be a lot but wasn't quite expecting that much.
These appear to be 28mm in 70mm frames with a U-value of 1.4. It will be a lot better than the current frames which must be 40 years old at least but otherwise seems fairly middle of the road.
jellybaby
Standard sized uPVC window from Wickes - £100-400
Big custom size window but still uPVC - £5000!
Think I might get another quote.