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Do I need permission to create an opening for a new window?
Inserting new windows which look similar to those previously used in the house will often not require planning permission. Some rules apply to new additions, for example if they are on an upper-floor side elevation they must be obscure glazed and non-opening or more than 1.7 metres above the floor.
Installing a new bay window on the front elevation would require planning permission as it is classed as a forward extension.
If you live in a listed building or conservation area you should contact your local planning authority.
Any new openings will have to comply with building regulations, this may impact thermal heat loss, structure, ventilation and fire safety.
You can use a member of a competent person scheme to complete any work, this will ensure that the work is completed in-line with regulations.
Common Questions
For houses, replacing windows with double glazing usually doesn’t require planning permission, provided the style and appearance are similar to the original. However, if you live in a flat/maisonette, listed building, or a conservation area, planning permission or listed building consent may be required, especially if the changes affect the external appearance.
Read more about planning permission for windows and doors for houses
Read about planning permission for windows and doors for flats and maisonettes
By law, any planning permission granted expires after a certain period. Generally, unless your permission says otherwise, you have three years from the date it's granted to begin the development. If you haven't started work by then, you will probably need to reapply.
A single storey rear extension can fall under permitted development, meaning planning permission may not be required providing it meets certain criteria.
In terms of height, the extension must:
- Be no taller than four metres at its highest point
- Have eaves no higher than the eaves of the original house
- Not exceed the height of the original dwelling
Read about planning permission for extensions on Planning Portal
In many cases, you can build a porch without planning permission under permitted development rights, provided certain criteria are met. To qualify as permitted development, your proposed porch must:
- Not exceed three square metres in external ground area
- Be no taller than three metres in height
- Be located at least two metres away from any boundary with a highway
Read more about porches on Planning Portal
If you carry out development without the necessary planning permission, and it doesn’t fall within permitted development rights, you may be in breach of the planning rules. In such cases, you will usually need to submit a retrospective planning application to seek approval for the work already completed or started. However, there is no guarantee that permission will be granted.
Learn more about planning breaches on Planning Portal
