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In instances where double glazed windows are not allowed (i.e. listed buildings) or required for whatever reason, we can refurbish your windows with new timber single glazed sashes into existing frames, like for like. 


Providing existing frames are sound, we can install new timber double glazed sashes into existing frames, which is a great upgrade to sash windows at less of the cost than full box sash replacement. 

We provide complimentary assistance with the planning applications when and where needed. 

draught proofing 

Often we come across windows and doors that do not need replacing, yet could do with little improvement. Our draught proofing services include replacement of the beads for draught proofed ones as well as the overhauling of the windows, installing new nylon cords and re-balancing; thus reducing draft by 95%, eliminating rattling sashes and reducing noise levels.

secondary glazing

In instances where double glazed windows are not permitted or simply not required, but where busy road or other external elements are the cause of discontent, secondary glazing for sash windows may be the ideal solution.


It's a cost effective and efficient method of insulating and sound proofing windows as well as saving up to 10% on your heating bills. Secondary glazing is perfect for use in Listed Buildings and conservation areas. Made from strong light weight aluminium, it can be made to be very slim and discreet. Adding Secondary Glazing to your existing windows is considered a reversible change. Doing so is recommended by English Heritage and the Listed Property Owners Club


We can supply and fit acoustic glazed secondary glazing specifically designed for sash windows - sliding sash tilt back version / easy clean, spring balanced, with reveal fixed and glazed with St. Gobain acoustic glass, 6.8. 

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Sash Window Doctor Ltd. 

Berkeley Crescent,

Dartford, Kent






01322311739 evenings

07855858184 anytime

sash windows made in britain
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