You can replace single glazed windows with double glazing if both the following conditions apply:
- you are not living in a conservation area or listed building
- there is no change in:
- material
- colour
- size
- design
If you are planning on changing the material of your windows, for example replacing timber windows with uPVC windows, you will need planning permission.
If you live in a conservation area or listed building, it is likely that planning permission will be required to change windows.