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If you can stomach it you are better off stripping the whole lot out and replacing with modern (wooden or ZMG plastic / composite) units. The cost will be similar to a retrofit + service and they will last a lot longer. We looked at retrofitting dg panels to older sg frames and like Airhead knows it's not really feasible or if it is it's not durable. It's almost certainly non-economical.
Secondary glazing seems to be recommended by conservation folks, so if you really want to keep whatever is there now, or you can't remove it for whatever reason, you can add a new layer of glass internally (or even that stick on plastic stuff).
Howard
Anyone had their old single glazed sash windows converted to double glazing (just changing the glass and retaining the nice original wood frame for maximum OG forum points). Worth it?
Thinking better insulation and reducing road noise.