Secondary Glazing

Secondary Glazing

What is Secondary Glazing?

Secondary glazing house

Secondary glazing is the process through which a discreet, internal window is fitted to an existing single or double-glazed window to enhance performance. It’s seen as a desirable alternative to double glazing – especially for heritage properties – as it allows you to maintain the external character of the structure whilst taking advantage of the benefits created by double glazing.


When you take advantage of secondary double glazing, you enjoy all the benefits that come with an extra layer of insulation over your windows. This cuts down on heat transfer, which means that your home/property stays warmer in the winter and cooler in the summer. But it also insulates against sound and enhances the security of your property.


JMP Window Systems Ltd range of Secondary Glazing is fully assembled and comprises an aluminium outer frame joined to a seasoned hardwood surround which allows for a neat, unobtrusive installation even in the most difficult situations. A range of hardwood sub-frames and scribing trims can be used to assist face fixing, reveal fixing and the coupling of units. This allows the satisfactory refurbishment of our largest primary windows.


Suitable for all types of premises including grade one and two listed buildings, schools, colleges, hospitals, universities, hotels, households and commercial buildings.


Benefits of Secondary Glazing:

  • Reduce Noise levels by up to 80%
  • Easy to Install
  • Discrete
  • Blends perfectly with the existing design style and motif that are already in place
  • Retains character
  • Reduce heat loss through existing window by up to 65%
  • 10% more heat efficient than double glazing
  • Can be installed within conservation areas
  • Available in over 200 RAL colours
  • Affordable
  • Enhancing building security. No external access is required, ideal for multi-storey buildings.

Window Styles:



JMP Windows Brochure

Posted On 24 Oct , 2018

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