House extension planning permission exists to control development of the character and amenity of an area, so, regardless of the nature of your extension, you’ll always need to get any necessary house extension planning permission and/or Building Regulations approval before starting work.
In addition, it’s sensible to talk to your neighbours as soon as possible in case your proposals will adversely affect them. For example, your plans could overlook their property or block out light. Discussing any concerns early on will make life much easier, especially if planning permission is required, in which case the local council’s planning team will make them aware of your intentions anyway.
The law relating to ‘permitted developments’ – Extensions that don’t need planning permission – varies according to:
- Property type, eg detached, semi-detached
The nature of the proposed development*, ie:
- Loft or basement conversion, which often don’t need house extension planning permission, unless there’s also a change of use (cellar to garage)
- Outward extension
- Height and width of any new part of your home
- Which part of the UK you live
If your home is a listed building or in a conversation area, you’ll need house extension planning permission and Building Regulations approval. As will anyone living in: a National Park; an Area of Outstanding Natural Beauty; the Norfolk or Suffolk Broads; any other local/national designation.