London and herts sash windows sash window specialists in restoration draught proofing double glazing

Fitting slim line double glazing to original sash windows is the perfect way to enjoy the benefits of double glazing while keeping the look and feel of your original period sash windows.


Our expert team will remove your sash frames, which will undergo a restoration, stripping them back to reveal the timber.  At this point the rebates are routered to make way for the slim line double glazed unit. New glazing will be fitted with new glazing putty to keep traditional look of your windows


When fitting new double glazing to original sash windows, we offer a restoration of the sash frames, window box and sill as part of this service.  We fully recommend this work to be taken place at this point, while the windows are removed, making the best of the windows whilst this all important glazing work is taking place.


When the newly slim line double glazed sash frames are fitted, they will be fitted fully draught proofed.


Double Glazing Original Sash Windows

London & Herts Sash Windows Ltd

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Tel - 01992 845004    

5 Yeomans Court, Ware Road, Hertford, SG137HJ                              

  • Sash Window frames removed from window box

  • All timber receives a full restoration

  • Glazing rebates routered to accept new slim line glazing

  • Glazing fitted with glazing putty, rather than timber beading to keep traditional look

  • Newly slim line double glazed sash frames will be fully decorated

  • Window box and sill will be fully decorated

  • Sash frames fitted with draught proofing and new cord

  • Sash frames will be fitted with new lead weight to ensure correctly balanced and sufficient movement within the window box


  • Keep the look and feel of original sash windows

  • Great for Conservation Areas and Restoration projects looking to keep original features

  • Enjoy the benefits of double glazing


If you have sash windows that are draughty, create a cold room there is the option of repairing them and fitting double glazing to the existing sashes.  London and Herts Sash Windows also build custom-built new double-glazed sash windows - handcrafted by our specialists. Double glazed sash windows will help to improve the heat efficiency of your home or business premises.

Double Glazing Original Sash Windows Highlights

Double Glazing Original Sash Windows Benefits

Contact us today to discuss double glazing your existing original sash windows.


Please call on 01992 845004 or email us at

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Our fully trained sash window restoration and glazing craftsmen work throughout Essex, Hertfordshire and London. Whether you live in Highgate, Kensington, Royston, Barnet, Enfield, Saffron Walden, Sawbridgeworth, Shoreditch, Hertford, Bishop's Stortford, Harlow, Hackney, Epping or beyond - We are the local sash window double glazing and restoration experts.

Double glazing original existing sash window will improve draughts and heat loss