Aluminium Secondary Glazing

Secondary glazing involves adding an extra slim line window in addition to your existing windows. It is cost effective and an efficient means of insulating and sound proofing windows.

GGSL provide Secondary Glazing services in King’s Lynn, Downham Market and right across East Anglia (Norfolk, Suffolk, Cambridgeshire, Essex, Hertfordshire & Bedfordshire) and Greater London.

Secondary Glazing is ideal for use in listed buildings and conservation areas. Made from strong lightweight aluminium (in accordance with BS EN 755) with a primed sub-frame, it is slim and discreet and offers the following enhancements to existing windows:

  • Sound Proofing
  • Thermal Insulation
  • Condensation Control
  • Added Security
  • RAL Finishes & styles to suit (standard finish polyester powder coated white)
  • Glazing : Float, Toughened, Low E, UV, double / triple glazed options available
  • Years of robust, trouble free service
  • Discreet unobtrusive finish
  • Fixed units, lift-outs, hinged units & horizontal sliders
  • Standard, balanced & tilt-in vertical sliders
  • Heritage range for conservation, listed & historic buildings
  • Angled, curved, radius or arched heads
  • Fire rated applications (steel frames / fire rated glass)

For more information please see the Secondary Glazing Brochure on our Downloads page.


Most of our secondary windows can be fitted with fly-screen mesh instead of glass.

Additionally, many of the secondary windows can be supplied with interchangeable inserts – with flyscreens for summer pest & insect control – and secondary glazed for winter thermal insulation.

The glass fibre fly-screen mesh is translucent, providing excellent visibility and ventilation, as well as being both corrosion and combustion resistant. Woven from glass fibre yarn, the mesh has a protective vinyl coating that is resistant to staining and easy to clean. The standard fly screen mesh colour is a very light grey and once fitted it is virtually invisible.

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