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I renovate sash windows and replace the 3 or 4mm glass with 6.3mm acoustic laminate glass. I looked at all the different ways of adding double glazing but to make it work it needs a big gap in the middle and it's near enough impossible to achieve that with conventional double glazing. There are also issues with the edge sealing, if you have an edge seal small enough to be hidden by putty it is also vulnerable to leaking which means blown units. Bear in mind the extra weight of the dg units needs larger balancing weights and even the acoustic glass is approaching the largest weights you can fit in the og boxes.
There is a modern type of dg unit which is very thin the way it's made is complicated but too expensive to produce in small sizes.
I've found properly sealed sash units with acoustic glass are the best option if you really want original frames and boxes. If you can stand to have larger boxes/thicker sashes they can improve on performance but getting good fitters is difficult.
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Airhead
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.