Commercial & homeowner

Secondary Glazing

Secondary glazing is an effective and economical method of improving your home’s thermal and acoustic insulation. A slimline lightweight aluminium window is added to your existing window’s interior to boost its performance. Secondary glazing is available in a variety of sizes and can be designed to fit most window types.

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Secondary glazing in Bath, Bristol, Wiltshire and Gloucestershire

Secondary glazing is often used in listed buildings and conservation areas. It is slim and discreet and is considered a reversible alteration by conservation officers. It is the ideal solution for homes located near busy roads, airports, or in noisy city centres. At Techniglaze, we install a range of secondary glazing styles from respected manufacturer Selectaglaze. These include horizontal sliding, vertical sliding, hinged, lift-out, fixed (fire-rated), and demountable. Secondary glazing is usually installed onto single glazed timber windows. It can be designed to meet bespoke specifications to ensure a low visual impact, perfect for either residential or commercial glazing applications.

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    Techniglaze secondary glazing is available in a vast arrange of colour options including over 200 RAL colours. Their durable powder coat finish is weather resistance, low maintenance, and will stay looking bright and fresh for many years. A full list of our colour options for all of our products can be found within our technical documentation. Colour tone shown may differ to actual finished product, please request a swatch if you require an accurate representation.


    Techniglaze secondary glazing is available in a range of configurations to suit your style of windows. From horizontal and vertical sliding, to fixed, hinged, and lift-out casement; secondary glazing is a versatile solution to improving your window’s security and efficiency. Its semi-permanent design means that it is the perfect choice to enhance the performance of traditional windows in protected conservation areas.

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    What is a secondary glazing?

    Secondary glazing is a technique for improving the insulation and soundproofing of windows. It involves fitting a second pane of glass or plastic to the inside of an existing window, creating an insulating layer of air in between the two panes. This extra layer of glazing provides improved insulation and sound reduction, as well as additional security.

    Is secondary glazing worth doing?

    Secondary glazing can be a cost-effective way of improving the insulation and soundproofing of existing windows without the expense of replacing them with double or triple glazing. However, as compared to double or triple glazing, secondary glazing may not be as effective in terms of reducing heat loss and noise. According to one source, a secondary double glazed window will have a U-value around 2.7W/m2, which is around twice as much as a primary double glazed window with an air gap of 12mm. Triple glazing, on the other hand, can achieve a U-value of at least 0.8W/m2. However, secondary glazing can still provide significant benefits, such as improved insulation and sound reduction, and may be a good option in situations where double or triple glazing is not possible or desirable.

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