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Double Glazing Sash Windows

Double Glaze Existing Sash Window 

Cost £500 - £800 per window (1 pair of sashes)


Replacement Double Glazed Sash Window 

Cost £700 - £1100 per window (1 pair of sashes)

The purpose of our sash window Double Glazing service is:

Increase thermal efficiency and reduce noise, whilst still keeping the traditional sash window appearance exactly the same.


Double Glaze Existing Sash Window Cost between £500 - £800 per window (1 pair of sashes) depending on size and style of sash window


Double glazing sash windows would be an additional measure to draught-proofing to help with noise reduction and energy efficiency. If the woodwork of the sashes are in a good enough state and are thick enough to allow for the installation of double glazed units then we offer this service.

  • Detailed measurements taken for the ordering of new Argon filled double glazed sealed units.
  • Existing single glazing carefully removed and disposed.
  • Any needed timber repairs to strengthen the sashes carried out.
  • Alterations made to existing sashes to allow for the change of encasing single glazed glass to upgraded double glazed units.
  • Additional Lead sash weights fitted to box frame to correctly counter-balance heavier double glazed units.
  • Double glazed units fitted within the original sash windows and re-installed back into box frame.

New Replacement Double Glazed Sash Window Cost between £700 - £1100 per window (1 pair of sashes) depending on style and size of sash window

This service differs from the one above in that we manufacture replica original sash windows as opposed to fitting double glazed units within the originals. The benefits are the same, but this one would be preferred if your original sashes are not in a viable or good enough state to work with.

  • Detailed measurements taken to begin process of manufacture of new sash windows in our workshop.
  • Sashes to be bespoke made using Mahogany Hardwood or British Columbian Pine (a high quality softwood), exactly copying the original sash windows in their traditional style.
  • Sashes glazed with Argon filled double glazed sealed units.
  • Sashes brought to site and installed into box frames, replacing the originals.
  • New Lead sash weights included to correctly counter-balance heavier double glazed sashes.
  • Additional lead sash weights fitted to box frame to correctly counter-balance heavier double glazed units.
  • The replacement sash windows to be supplied fully painted with Dulux oil based primer, undercoat and top coat paints.

This service can also be applie​d to all wooden windows and doors.


Do you need any upgraded security on your sash windows? Please visit our sash window Locks and Security page.

  Draught-Proof & Overhaul  

    Double Glazing Sashes     

     Painting & Decoration     

          Timber Repairs           

           Locks & Security         

  Broken Sash Cords & Glass 

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