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Can You Put Double Glazing In Old Sash Windows In Reading?


If you live in an old property with original sash windows, you may be wondering if it is possible to upgrade them with double glazing. Sash windows have a classic look and charm that cannot be matched by modern windows, but the single pane glass can be a major source of heat loss and noise pollution. Double glazing can provide the insulation and soundproofing you need without compromising on the aesthetics of your property. But can you put double glazing in old sash windows in Reading? The answer is yes, and in this article, we will explore how Sash Windows Berkshire can help you with this project.

Sash Windows Berkshire

Sash Windows Berkshire is a company that specializes in double glazed sash windows in Reading and the surrounding areas. We understand the unique challenges of upgrading old sash windows with modern technology, and we have the experience and expertise to deliver high-quality results. We can help you preserve the traditional look and feel of your property while improving energy efficiency, noise reduction, and security.

Double Glazing

Double glazing is a technology that involves two panes of glass with a layer of air or gas in between. The air or gas helps to insulate against heat loss and noise transfer, making your home more comfortable and quiet. Double glazing is a popular choice for modern windows, but it can also be applied to old sash windows. The key is to find a company that understands the unique challenges of sash windows and can provide a bespoke solution that meets your needs.

Sash Windows

Sash windows are a type of window that consists of two sashes that slide up and down within the frame. They were popular in the UK from the 17th century to the early 20th century, and many old properties still have original sash windows. Sash windows have a classic look and feel that is hard to reproduce with modern windows, but they are also known for their poor energy efficiency and noise reduction. Upgrading sash windows with double glazing can provide the best of both worlds: preserving the aesthetics of the original windows while improving their performance.

Secondary Glazing

Secondary glazing is another option for upgrading old sash windows. It involves adding a second layer of glass to the interior of the window frame, creating an air pocket between the two panes. Secondary glazing is less expensive than double glazing and can still provide some insulation and noise reduction benefits. However, it is not as effective as double glazing and may not meet building regulations for energy efficiency.

Listed Properties

If your property is listed, you may be concerned about whether you can make changes to the windows. Listed buildings are protected by law, and any alterations must be approved by the local council. However, in many cases, it is possible to upgrade sash windows with double glazing without compromising the historic fabric of the building. Sash Windows Berkshire has experience working with listed properties and can advise you on the best course of action.

Wooden Frames

Most sash windows are made of wood, which can be more challenging to upgrade than uPVC frames. The wood needs to be carefully prepared and treated to ensure the new double glazed units fit correctly and do not damage the existing frame. Furthermore, the added weight of the double glazing units can put a strain on the existing hardware, such as pulleys and cords. Sash Windows Berkshire has the expertise to work with wooden frames and can provide a bespoke solution that meets your needs.

New Windows vs Existing Windows

When upgrading sash windows with double glazing, you have a choice between installing new windows or retrofitting the existing windows. Installing new windows involves completely replacing the existing frames with new ones that have integrated double glazing units. Retrofitting involves adding double glazing units to the existing frames without replacing them. Retrofitting is generally less expensive than installing new windows, but it may not provide the same level of performance or durability.


In conclusion, yes, you can put double glazing in old sash windows in Reading. With the help of Sash Windows Berkshire, you can upgrade your sash windows with modern technology without compromising on the traditional look and feel of your property. Whether you choose double glazing or secondary glazing, installing new windows or retrofitting the existing ones, we can provide a bespoke solution that meets your needs. Contact us today at 0118 449 2798 or email us at [email protected] to discuss your project. Visit our website at to learn more about our services and see examples of our previous work.

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