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No. They're not insulated anywhere at all so the whole wall is a cold bridge. The windows will be the only insulated part. Got to love Victorian houses. The downstairs extension is ludicrously well insulated - you can almost feel the bulk of it when you're in there, it sort of deadens sound too. But the rest of the house leaks heat terribly.
Sparky
ectoplasmosis
We're doing the same for both windows on the first floor, but we're building out the reveal using timber and PIR insulation, as masonry will create a massive cold bridge.
Are you insulating the solid brick wall internally/externally?