How large can my extension be without needing planning permission?

June 15, 2020 1:31 pm


It is worth noting that there are specific restrictions for all extensions and these include:

A veranda or raised platform like a balcony

Antennae or satellite dishes

Any change to the existing roof of the property

Materials used for the extension must be of a similar character to that used in the original property.

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Extensions to the side have the following restrictions:

  • Must not be over 4 metres in height
  • Must only be a single storey
  • Must not exceed half the width of the original property

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Single storey extensions must adhere to the following:

  • Must not extend beyond 4 metres for a detached house and 3 metres for any other type of structure.
  • Cannot exceed 4 metres in height.
  • Where land is not an area of scientific interest or designated as protected, prior approval can be sought for an extension to reach 8 metres from a detached property or 6 metres for all other property types. Extensions can reach up to 4 or 3 metres without planning permission required.