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Do You Need Planning Permission for Windows?
When planning to change or install windows, it’s important to understand when planning permission is required — and when it isn’t.
In most cases, if you are simply replacing existing windows with new ones of a similar size and appearance, you do not need planning permission. This is because such work usually falls under permitted development rights.
However — even if planning permission isn’t needed — many window replacements must comply with building regulations (for example, for energy performance or safety), and these may require formal approval or installation by a registered installer.
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- Double glazing significantly reduces heat loss compared to single glazing
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- Helps lower energy consumption and carbon footprint
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When Planning Permission Is Required
You will need planning permission in certain situations, such as:
- New Window Openings
If you’re creating a completely new window opening in an external wall, you may need permission, especially if the change alters the building’s appearance.
- Roof Lights or Skylights That Project Outwards
Installing a roof light that sticks out more than 150 mm from the roof surface or is higher than the roof’s highest point typically requires planning approval.
- Upper Floor Side Windows
Adding new windows on side elevations that aren’t obscure-glazed and can open may need planning permission — unless the opening is above 1.7 metres from the interior floor level.
Special Rules for Certain Properties
In some circumstances you might need permission even if the work would normally be permitted:
Listed buildings often require formal consent before altering windows.
Conservation areas and designated zones may have extra restrictions or local rules that remove those usual permitted development rights.
If in doubt, it’s strongly recommended to check with your local planning authority before starting work.
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