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Secondary glazing services in the East Counties and Greater London

Sash Window Preservation are your secondary double glazing specialists, just get in touch to discuss your requirements.


Secondary double glazing

Secondary glazing refers to the installation of an additional window pane or layer of glazing on the interior side of existing windows. It is a cost-effective method of improving insulation, reducing noise, and enhancing security in buildings.

Here are some key points about secondary glazing:

Purpose: Secondary glazing is primarily used to enhance the thermal and acoustic insulation of windows. It provides an extra barrier between the interior and exterior of a building, reducing heat loss and minimising external noise.


Installation: Secondary glazing involves fitting a supplementary glass or acrylic panel to the inside of an existing window frame. The panel is typically attached using magnetic strips, removable clips, or a secondary frame. The installation process is relatively quick and non-intrusive compared to replacing the entire window.


  • Thermal insulation: Secondary glazing improves the energy efficiency of windows by reducing heat transfer. It helps retain heat during winter and prevents excessive heat gain in summer, leading to energy savings and increased comfort.

  • Noise reduction: The extra layer of glazing helps block external noise, making it particularly useful for homes or buildings located in noisy areas such as near busy roads or airports.

  • Improved security: Secondary glazing adds an additional layer of protection to windows, making them more resistant to break-ins and burglaries.

  • Condensation control: It can help reduce condensation on windows by creating a warmer surface and preventing cold spots.

Types of secondary glazing:​

  • Fixed panels: These are non-opening panels that provide insulation and noise reduction. They are commonly used in areas where ventilation is not a primary concern, such as bedrooms or living rooms.

  • Hinged panels: These panels can be opened or closed for ventilation purposes. They are suitable for rooms where occasional airflow is desired, such as kitchens or offices.

  • Sliding panels: These panels can be horizontally or vertically moved to allow access to the primary window for cleaning or ventilation.



Compatibility: Secondary glazing is compatible with most types of windows, including sash windows, casement windows, and even curved or shaped windows.

  • Aesthetics: The added layer of glazing may slightly affect the appearance of windows from the inside. However, modern secondary glazing systems are designed to be discreet and blend with the existing window frames.

  • Maintenance: Secondary glazing is relatively low maintenance. The panels can be easily removed for cleaning and maintenance of the primary window.

  • Cost: Secondary glazing is generally more cost-effective than full window replacement. The exact cost depends on factors such as the size of the windows, the type of glazing, and the complexity of the installation.


It's worth noting that while secondary glazing provides several benefits, it may not be as effective as double or triple glazing in terms of insulation. However, it is a viable option for properties where replacing the primary windows is not feasible or desirable.

an open secondary glazing window

Call Sash Window Preservation on: 01603 908252 or 01223 927252 to discuss how we can help you with your secondary glazing requirements. We cover all of the Greater London and East Counties areas.

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