This will not require planning permission provided:
- It would not project more than 3 metres from an original rear wall on a terraced or semi-detached house or 4 metres on a detached house
- It does not exceed 4 metres in height
- If it is within 2 metres of your boundaries, the eaves are not more than 3 metres high
- Unless it is a conservatory, it is built using external materials similar in appearance to those on the existing house.
There are also temporary provisions to extend terraced and semi-detached houses by up to 6m and detached houses by up to 8 metres. These provisions expire on the 30th May 2019.