Extending Your Home Without Planning Permission

In August 2020 the Government introduced new permitted development rights which allow you to add additional storeys onto your house without requiring planning permission.

Subject to the following limits and conditions, and an application for the Local Authority’s Prior Approval, you can build up to two additional storeys onto your existing home.

The current house:

  • Is not a building containing one or more flats, or a flat contained within such a building
  • Was constructed between 1 July 1948 and 5 March 2018
  • Has not already had additional storeys added to it
  • Is not on Article 2(3) land (including Conservation Areas and Areas of Outstanding Natural Beauty) or a site of special scientific interest
  • Was not changed to be used as a house (from a previous non-residential use) under permitted development rights.

Limitations on the proposed development:

  • Number of additional storeys:
    • One storey can be added to a single storey house
    • Two storeys can be added if the house has more than one storey.
  • Height increases:
    • The house cannot exceed 18 metres in total height
    • Each added storey cannot add more than 3.5 metres to the total height
    • If not detached (e.g. terrace or semi) the total height cannot be more than 3.5 metres higher than the next highest building that the house is attached to, adjoins, or is in the same row as.
  • The additional storeys must be constructed on the principal part of the house
  • The additional storeys must not exceed three metres in height or the height of any existing storey in the principal part of the house (measured internally from floor to ceiling)
  • Engineering operations must only include works within the existing curtilage of the house to strengthen existing walls and foundations
  • The materials used must be of a similar appearance to those used in the construction of the exterior of the current house
  • Windows must not be placed in any wall or roof slope forming a side elevation of the house.

Following completion of development:

  • The house must remain in use as a domestic residential property
  • No visible support structures must remain on or attached to the exterior of the house
  • The roof pitch of the principal part of the house must be the same as it was prior to the development.

If these limits and conditions are not met, then an application for Householder/Full Planning Permission will be required.

If you have property to extend and would like to explore the options available, please contact the Planning and Architecture Team on 01789 387880 or visit the Planning and Architecture pages of our website.