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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;
  • Following the extension the total area of ground covered by buildings within the curtilage of the house (other than the original house) would exceed 50% of the total area of the curtilage (excluding the ground area of the original 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;
  • It does not include the construction or provision of a veranda, balcony, raised platform, microwave antenna, chimney, flue or soil and vent pipe;
  • Unless it is a conservatory, it is built using external materials similar in appearance to those on the existing house;
  • If the property is in on Article 2(3) land, i.e. a National Park, an Area of Outstanding Natural Beauty, a Conservation Area, an area designated under s41(3) of the Wildlife and Countryside Act 1981, the Norfolk Broads or a World Heritage Site, no part of the original or extended house is clad in stone, artificial stone, pebble dash, render, timber, plastic or tiles.

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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