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Anyone who has single glazed sash windows in their home has probably asked themselves whether they should double glaze their windows at some point but what is the answer?

Replacing Single Glazed Timber Windows with Double Glazed Windows

A lot of period properties suffer from cold rooms alongside high heating bills.  If your windows are single glazed one option is to replace them with new double glazed sash windows.

Unlike single glazed windows, double glazed sash windows have a gap between the two panes of glass which is filled with argon or krypton.  As air is a poor conductor of heat, heat loss is reduced, allowing your home to retain the warmth.


To obtain a free, no obligation quotation to install new double glazed timber windows in your property, please contact us on: 01344 868668.

However, if your windows are still in a good condition it may be worth looking into alternative options rather than replacement to help preserve the heritage of your property and help reduce the cost of installing new windows.

Installing Secondary Glazing

If you live in a listed property, you may not be allowed to replace your single glazed windows with double glazing.  One option to improve the warmth of your home, which is often preferred by planning officers, is secondary glazing.

Secondary glazing provides the benefits of modern glazing solutions while retaining the existing external windows.


Secondary glazing solutions are unique depending on the configuration of the existing windows.  At The Sash Window Workshop we are proud to be able to offer both sliding and hinged secondary glazing systems to suit your individual requirements.

Can I Double Glaze Existing Timber Sash Windows?

As long as the moving parts of your window are deemed to be in a good condition and deep enough to accommodate a double glazed unit, The Sash Window Workshop's Bi-Glass service allows you to double glaze your existing timber windows without replacing the windows.

Our surveyor will conduct a thorough survey of the windows and doors in your property and will advise you if this product is suitable to meet you individual requirements.

The Bi-Glass service works by removing the existing glass from your windows, altering the glazing rebate, before fitting new glass.  The Bi-Glass process is carried out on-site using our specialist vans and experienced trained Bi-Glass installers.

Some of the benefits of double glazing existing timber sash windows, using our bi-glass service, include:

  • The service is speedy and efficient, not taking as long as it does to replace a window
  • Cheaper than replacing your existing timber windows
  • Double glazing will make your home more energy efficient than single glazed windows.
  • As part of the Bi-Glass service to double glaze your existing sash windows, your windows are also draught proofed.

If your windows are not suitable for double glazing the existing windows, we may be able to install new double glazed sash windows into the existing window frames.


Draught Proofing Timber Windows

Draught proofing can also help improve your sash window’s performance at a fraction of the cost of replacement.  Without draught sealing, draughts, dust, dirt and noise can all flood into your home.

Our draught proofing and overhaul service will not only help remove the cold draughts from your home, but we can also make minor repairs to any damaged timber or glazing, and fit new ironmongery and locks on your timber windows.

At The Sash Window Workshop, we are specialists in repairing and replacing timber sash windows in a range of period properties and listed buildings, including Georgian, Edwardian and Victorian homes.

To enquire about any of our timber sash window services, please contact a member of our team on: 01344 868668.

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