Conserve Secondary glazing

If your home is in a conservation area or is a listed building, you may not be able to change your existing windows to double or triple glazed units but you can still save up to £105 per year if you fit secondary glazing.

Secondary glazing consists of a secondary pane of glass attached to a frame which is fitted inside your existing window reveal.

Secondary glazing
20 Maximum lifetime of measure (yrs)

Secondary glazing units are normally not as well sealed as a double-glazed unit but they still work in the same way so will help to cut your energy use and save you money.

Low emissivity coating can also be used on secondary glazing and this works by allowing the heat from the sun to enter and warm the room but when this interior heat tries to escape to the colder outside, the coating reflects the heat back. This reduces the radiant heat loss through the glass and can also be a benefit in the summer, as the reverse happens and your rooms stay cooler..

  • Secondary glazing Advantages

  • Energy efficient windows could save you around £165 per year on your energy bills compared to existing single glazed windows.
  • If you install Energy efficient windows you will use less fuel. This means that you will be generating less of the carbon dioxide that leads to global warming which is typically 680kg a year.
  • Energy-efficient glazing reduces draughts and cold spots.
  • Energy efficient-windows cut down outside noise.
  • Secondary glazing Disadvantages

  • Secondary glazing units are normally not as well sealed as a double-glazed unit but they still work in the same way so will help to cut your energy use and save you money.

Available with

You can get grants for Secondary glazing, below are the schemes this is available with.

* According to data sourced from the Energy Saving Trust website.

Average savings £105 Per year.