27 / April

FAQ: What is Secondary Glazing?

Secondary glazing is a fully independent internal window, fitted on the room side of an existing window. The frames are slim but strong. They are made from durable aluminium and require little maintenance.

Replacing your current windows isn’t always an option, particularly if you live in a listed building or conservation area. Secondary glazing gives you many of the benefits offered by new windows without looking obtrusive.

Secondary glazing gives you many of the benefits offered by new windows and provides significant noise reduction, improved thermal performance and enhanced security. When installed correctly, secondary glazing offers the most effective noise insulation, significantly outperforming double glazing it can reduce noise levels by up to 80% (50dB).

With the right glass, heat loss can be significantly improved by as much as 65% which exceeds Building Regulation requirements. Low E-glass is often the best choice for traditional properties, listed buildings and conservation areas because it maintains their appearance, character, integrity and value. The glass has been designed to provide:

  • The very best single glazing insulation
  • Maximum energy conservation
  • An extremely discreet installation
  • An environmentally friendly solution
  • An affordable investment with quick returns

Secondary glazing is extremely difficult to open from the outside, providing an additional barrier against forced entry making your home more secure.

There are different styles of secondary glazing available to suit your taste and your property. Slim, discreet aluminium profiles with easy access to your existing windows are a popular choice with homeowners. These products are particularly suitable for listed buildings, conservation areas and other heritage buildings.

Heavy-duty aluminium profiles that are slightly thicker are more suited to large-scale commercial installation. This type of secondary glazing offers a high level of security, easy access to existing windows and secure night ventilation position.

Secondary Glazing can be:

  • Horizontal Sliders
  • Vertical Sliders
  • Hinged Casement
  • Lift Out Windows
  • Fixed Windows
  • Bespoke (for arched windows for example)

If you would like to receive a quote for secondary glazing, please contact us or download our Secondary Glazing brochure here.

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