Draught proofing timber sash windows

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8 Jan 2026
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Hi all,

We have 7 single glazed timber sash windows in our Victorian era property which are proving to be rather draughty. Some of the windows are also in need of light repairs, for example: mechanisms painted over, pullies missing, unable to open, soft wood etc.

We got a quote of ~£3000 to draught proof and restore the windows. I wondered if anyone has prior experience with draught proofing sash windows or could provide a second opinion on the quoted amount? :)
 
Good look with that , our office space had sash windows to one side ( listed building) all 60 were hardwood , modern double glazed with built in draught excluders and smoke seals .
You could still post a letter through the gaps .
Better to install secondary glazing.
 
A friend lived in a grade 2:house with sash windows.
He was pretty handy, having converted it back from three flats to a single home.
His windows were draughty.

He used a company who used routers to create a rebate in each sash, then filled the rebate with a brush like excluder. It worked pretty well. It wasn’t cheap.

If you have an office, I would be tempted to have secondary double glazing as well?
 

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