Secondary Glazing

Fully independent internal window

A fully independent internal window, fitted on the room side of an existing primary window. This provides significant noise reduction, improved thermal performance and enhanced security. Secondary glazing is often the product of choice for traditional buildings and properties, listed buildings and conservation areas, maintaining their appearance, integrity and value.



  • Well fitted secondary glazing provides outstanding noise reduction – outperforming double glazing.
  • The creation of an insulating layer of air is as important to the retention of energy as the fitment and seals.
  • The frames are made from tough aluminium joined to a seasoned timber surround.
  • Secondary glazing is extremely difficult to open from the outside and provides an additional physical barrier against a forced entry.
  • Extremely discreet

Granada Windows

We supply and fit secondary glazing from Granada as they produce quality, strong, reliable and long-lasting products that are beautifully designed.

All Granada secondary glazing offer a high level of additional security, easy access to the primary glazing and secure night ventilation position.All units comprise of an aluminium outer frame joined to a seasoned hardwood timber surround.

These bespoke products come in two ranges;

Traditional – With its slim, discreet aluminium profile this range offers minimal sight lies and easy access to the primary glazing. These products have been designed specifically for listed buidings, conservation areas and other heritage buildings.

Heritage – these products have a slightly thicker heavy-duty aluminium profile suitable for large-scale commercial installation, as well as smaller applications.

Different types of Secondary Glazing

Horizontal Sliding – The sashes slide within the frame and provide easy access to the outer window. Ideal for window linked with mullions and transoms.

Vertical Sliding – these units are ideal for treating traditional sash windows. Spring balances support the weight of the sash in all positions.

Lift Out – fixed units especially useful for those areas that do not need regular access.

Hinged Units – allow full and easy access to the outer window with no transoms or mullions to impede the view