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How it works around our way is that a local carpenter / builder sorts you out. Find someone local who's had it done, ask them who they used.
Then there's the outfits like this lot who we visited because we were looking to get the front door done too. Their stuff looked great but we backed away a bit because it wasn't clear how much making good internally and externally we would need and who would be supplying that. We got our existing 80s windows refurbed in the end.
I've heard timber frame + double glazing is a bit of a recipe for pain but not sure how much truth there is in that.
Has anyone had sash windows replaced? Looking for timber framed double glazed units for a Victorian terraced house in Hackney. Any recommendations/no goes would be great to hear about