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Victorian town house with sash windows

Bringing artisan to the 21st Century
Your local Sash Window experts - transform your home today. 


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Double glazing services you can rely on

Sash Window Preservation is an established company based in Norwich. We have an excellent reputation, providing a wide range of services across Greater London and the eastern counties. We specialise in double glazing, draught proofing and bespoke sash window repair, working with both domestic and residential clients alike.


You can be confident choosing us, we have an exceptional team of staff and are CERTASS qualified and an accredited CHAS contractor. In almost all cases our windows are manufactured locally using local suppliers. If you would like to arrange a free onsite or video quotation, just get in touch with us and we will be happy to help.

About home
a window repar

If your sash windows, frames or sills are in need of some TLC, we can offer varying techniques to solve common problems such as minor or major rot, cord renewal and window rebalancing.

double glazing repair
Double Glazing Existing

At Sash Window Preservation we are market leaders in double glazing existing frames. How? By creating a deeper rebate in the original frame this allows us to fit in a slim double glazed unit.

draught proofing and repairs
Draught Proofing

Our special draught excluder is fitted in the meeting rail along with the staff and parting beads. This leads to vast improvements to the thermal performance of the window and heat retention.

Residential sash window

Sash Window Preservation


We can help return your home’s sash windows back to their former glory with the minimum of mess and fuss.

“It is not often that I get blown away by a building product, but I find this absolutely extraordinary, looks like a single pane of glass”— Kevin McLoud, Grand Designs.

Sash Window Slim Double Glazing — As seen at Grand Designs Live

Sash Window Preservation


We have restored, repaired and renovated many sash windows belonging to schools, halls, estates and other commercial buildings. Just take a look at some of our successes.

a recent renovation

Get in touch

For help with double glazing, draught proofing and bespoke sash window repair across the Eastern Counties and Greater London, get in touch with Sash Window Preservation on:

01603 908252

01223 927252

certass sash window preservation
Britannia Safety
Consumer Protection Association
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