First Floor and Two Storey Extensions

First Floor and Two Storey Extensions


  • Increases your living space, creating the opportunity to add an additional bedroom or bathroom etc.
  • Adds value to the property
  • Avoid the time, effort and costs associated with moving home

N.B. A two storey extension is not a great deal more expensive than a single storey extension as both need foundations and a roof.

Planning Permission for Extensions is not always required

First Floor and Two Storey ExtensionsDo I Need Planning Permission?

Planning Permission may not be required subject to the following limits and conditions:-

  • No more than half the area of land around the "original house"* would be covered by additions or other buildings.
  • No extension forward of the principal elevation or side elevation fronting a highway.
  • No extension to be higher than the highest part of the roof.
  • Maximum depth of a single-storey rear extension of 3 metres for an attached house and 4 metres for a detached house.
  • Maximum height of a single storey rear extension of 4 metres.
  • Maximum depth of a rear extension of more than 1 storey of 3 metres including ground floor.
  • Maximum eaves height of an extension within 2 metres of a boundary of 3 metres.
  • Side extensions to be single storey with maximum height of 4 metres and width no more than half that of the original house.
  • 2 storey extensions no closer than 7 metres to the rear boundary.
  • Roof pitch of extensions higher than 1 storey to match existing house.
  • Materials to be similar in appearance to existing house.
  • No verandas, balconies or raised platforms.
  • Upper-floor, side facing windows to be obscure glazed; any opening to be 1.7 metres above the floor.
  • On designated land* no permitted development for rear extensions of more than 1 storey.
  • On designated land no cladding of the exterior.
  • On designated land no side extensions.

* The term original house means the house as it was first built or as it stood on 1 July 1948 (if it was built before that date). Although you may not have built an extension to the house, a previous owner may have done so.

* Designated land includes national parks and the Broads, Areas of Outstanding Natural Beauty, conservation areas and World Heritage Sites.

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