Double glazing is a way of creating an insulating layer – either normal air or special heavy gases – between two panes of glass. It lets in as much sunlight as single-glazed windows, but is better at holding in heat. Double glazing is standard in most new houses but it’s also worth installing in existing homes if you’re doing substantial repairs or replacing the windows. If you need to prioritise, install double glazing to the main heated areas of the house as well as to large windows.

Benefits of double glazing

Good double glazed windows:

  • can halve heat loss through windows
  • significantly improve thermal comfort of your home
  • reduce external noise
  • reduce or remove condensation build up in cold weather.