Yes, it is possible to build an extension without planning permission from the governing local authority. Such an extension is classed as a “permitted development”. These tend to be small extensions. A homeowner is usually entitled to build up to six metres (eight metres if the house is detached) without planning permission.

However, there are requirements that must be met, as follows:

  • Not more than 50% of the surrounding land can be covered by other buildings.
  • The extension cannot be forward elevation or side elevation in front of a highway (public/private road/established way on land).
  • The extension cannot be higher than the highest part of the roof.
  • Single storey extensions cannot go beyond the rear wall of the original building by more than eight metres.
  • Single storey extensions cannot exceed the maximum height of four metres.
  • Extensions with more than one storey cannot go beyond the rear wall by more than three metres.
  • Two storey extensions cannot be closer than 7 metres to the rear boundary of the house.
  • Balconies, verandas or raised platforms are not allowed.
  • The property is a house and not a flat.
  • The house has not been extended since 1948.
  • The house is not a listed building or located within a protected area such as an Area of Natural Outstanding Beauty (AONB).

It is highly recommended to seek professional advice by speaking to the relevant local authority or a property solicitor to confirm whether an extension would be classed as a permitted development.

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