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For a single-storey rear extension

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. 

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