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Ah that's a real shame. If you're fitting new windows they'll be much deeper than the existing, and can be set back into the room to make up the gap. I'd do whatever I could to keep them - so much nicer (and cheaper) than anything new.
Even if you keep the existing windows you could add 60mm of painted timber between the window and the reinstated cill - would eliminate a bit of cold bridging too.
dbr-
New aluminium windows were 25k and nobody would take that job on as the reveal would need to be cut back and 6 stories of scaffolding needed plus no sill projection allowed by Dulwich estates even if they gave us permission to change them.
So it’s internal insulation and secondary glazing.
New sills (stools if being pedantic) are not that expensive as we will be using offcuts from a granite dealer.
Mr_Smyth
Thanks, will add that to todays order, bolster is more bang bang and I want gentle persuasion.
@TW would love to but we are adding 60mm of insulated plasterboard so it’s not deep enough, will be fitting some kind of granite in its place.
Shame to lose it as its’s made of blue/red chips with sparkles which I presume is glass.