Sliding sash window restoration - double glazed units

27 Nov 2010
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United Kingdom
ok any recommendations who to use? I want to replace the sash windows in my flat (originaly single pain units at the moment) with double glazed units, but retain the original boxframe

googled sash window double-glazed providers:

replace just the glass with double-glazed units:

I want to fit them myself. I am not subject to any consetvation area regulations or similar. I mainly want to fit them for improved warmth.

there are two bedrooms

and the front room to do

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Sash windows are drafty due to the design, simply changing the glazing will do little to improve heat retention.
Converting them to double glazing will require them to be removed. Putting them back (or putting new ones in) will result in needing new beading (parting bead, and staff bead), so you'll probably have to use beading with draught proof brushes that are fitted in them.

I've used these and work fine. Sash windows do not have to be draughty.

Whether you get the existing sashes converted to D/G or get new ones made up is up to you. There are companies who have mobile workshops who can convert your sashes on site, although don't know how prices compare.

A cheap alternative is to get a sheet of acrylic, and have them held in place using magnetic tape. You may need strip of timber along each edge to mount them on, as the staff bead may get in the way.

It would not be as effective as D/G units, but it would be an improvement.

I used:
-Ordered to size
And tape from here:

Other things to improve thermal efficiency:
Thick curtains
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thnaks I hadn't thought about that. I might do that this winter as it's quick to implement, and look into changing the actual windows next spring / summer!

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