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I just stuck a second set of double glazing in mine (one on the outside wall, one on the inside wall. Works a treat. The 20cm air gap between the glazings means that the soundproofing is incredible.
alternatively, if the window is on an external wall, and you have a gap.. get slab of MDF (oversized to the window) and attatch handles to the back.
create fabric covered insulation block (or just wood blocks top and bottom) the dimensions of the window itself. Make it just shy of the depth of the window ledge (so there is an air gap, but you maximise "purchase" created on the ledge itself)
and a little fabric or rubber draught excluder around the block, where the mdf connects to the wall when placed in the window cavity (to make connection tight)..
Voila. You could even do the same with thick sheets of PVC to allow light in..
window soundproofing el Budgeto
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