Secondary glazing for sash windows

Secondary glazing is a great alternative to having new sash windows made, it’s energy-efficient, cost-effective and even allows you to keep your original sash windows, which means its better for the environment too. Secondary glazing is also a popular alternative for listed buildings or properties, as it doesn’t affect the external apprentice of your sash windows.

Example of secondary glazing in a sash window

Secondary glazing adds a second sheet of glass to a window frame, allowing you to retain original windows without making damaging alterations, tests by English Heritage also found that it cut heat loss by around 60%.

Sound proofing

Noise can be a big problem for sash windows, especially if you live near railway lines, by busy roads, or next to a prime spot for seagull mating! Again, secondary glazing is perfect for sound proofing, it provides a large cavity space and will create a more effective noise reduction solution than acoustic glass, or double glazing.

How does it work

Secondary glazing involves the installation of new, fully independent secondary window frames that are fitted inside the room of the existing sash windows.

There are a number secondary glazing options we can offer which include:

  • Lift out secondary glazing – this is the most cost-effective option, and is best suited to rooms or properties where you don’t need to open your sash windows very often.
  • Vertical sliding secondary glazing – this solution is mainly used for vertically sliding sashes, with the meeting rails aligning at the same level as the sash window’s meeting rail so they’re visually perfect.
Example of secondary glazing in a sash window

The difference the secondary glazing has made to our home is quite unbelievable. Thank you Jon, not being able to hear the planes heading to Heathrow in the morning has changed our world, we can even lie in at the weekends – great work :-).”

Ingrid & Sam – SE4 - London

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