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.

Was this answer helpful?

Add Your Law Firm

If you would like to add your law firm to, please click below for details on how you can get listed.

Add Your Law Firm