Permitted Development

we are committed to providing exceptional designs for our clients

0116 251 0606
request a free quote

Small house extensions and alterations may fall within you ‘Permitted Development Rights’, which allows the work to take place without the need for planning permission. There are a number criteria which need to be with some of the key points highlighted in our mini guide below. If your project is eligible for permitted development you may want to confirm this by obtaining a Certificate of Lawful Development.

Type of Extension

An extension to your house is considered to be a Permitted Development not requiring a full planning permission, if the following limits and conditions are met.

  • On designated land, cladding of any part of the exterior of a dwelling (and extensions) with stone, artificial stone, pebble dash, render, timber, plastic or tiles is NOT Permitted Development.
  • Extensions (including previous extensions) and other buildings must not exceed 50% of the total area of land around the original house*. Sheds and other outbuildings must be included when calculating the above 50% limit.
  • Extensions forward of the principal elevation or side elevation of a house and fronting a highway are NOT Permitted Development.
  • On designated land side extensions are NOT Permitted Development.
  • Materials used in exterior work are to be similar in appearance to those of the exterior of the existing house. This condition does not apply when the extension is a conservatory.
  • The width of the side extension must not have a width greater than half the width of the original house.
  • Side extensions are to be single storey with a maximum height of four meters.
  • If the extension is within two meters of a boundary, maximum eaves height should be no higher than three meters to be a Permitted Development.
  • Single-storey rear extensions must not extend beyond the rear of the original house by more than 3 meters, if an attached house (semi detached/town house/ terraced) or by 4 meters if a detached house.
  • Single storey rear extensions must not exceed a height of 4 meters.
  • The maximum eaves and ridge height of extension must be no higher than the existing house.

For further information in relation to permitted development single storey extension why not contact Design Studio Architects on 0116 251 0606 or email us at info@designstudioarchitects.co.uk

      • On designated land extensions of more than one storey are not a Permitted Development.
      • Extensions (including previous extensions) and other buildings must not exceed 50% of the total area of land around the original house. Sheds and other outbuildings must be included when calculating the above 50% limit.
      • Maximum eaves and ridge height of the extension must be no higher than the existing house. If the extension is within two meters of a boundary the maximum eaves height should be no higher than three meters to be a Permitted Development.
      • Extensions of more than one storey must not extend beyond the rear wall of the original house* by more than three meters or be within seven meters of any boundary opposite the rear wall of the house.
      • The roof pitch of extensions higher than one storey are to match that of the existing house, as far as is practicable.
      • Materials used in the exterior work are to be similar in appearance to those of the exterior of the existing house.
      • Any upper-floor window in a wall or roof slope in a side elevation must be obscure-glazed and non-opening unless the parts which can be opened are more than 1.7 meters above the floor of the room in which it is installed.
      • No balconies or verandas are a Permitted Development.

For further information in relation to permitted development double storey extension why not contact Design Studio Architects on 0116 251 0606 or email us at info@designstudioarchitects.co.uk

Loft conversions are NOT a Permitted Development for houses on designated land.

To be a Permitted Development any additional roof space created must not exceed these volume allowances:

      • 40 cubic metres for terraced houses.
      • 50 cubic metres for detached and semi-detached houses. Bear in mind that any previous roof space additions must be included within this volume allowance. Although you may not have created additional space a previous owner may have done so.
      • An extension beyond the plane of the existing roof slope of the principal elevation that fronts a highway is NOT a Permitted Development.
      • Materials are to be similar in appearance to the existing house.
      • No part of the extension is to be higher than the highest part of the existing roof.
      • Verandas, balconies or raised platforms are NOT a Permitted Development.
      • Any side-facing windows must be obscure-glazed and non-opening unless the parts which can be opened are more than 1.7 metres above the floor of the room in which it is installed.
      • Roof extensions, apart from hip to gable ones are to be set back, as far as is practicable, at least 20cms from the eaves. The 20cm distance is measured along the roof plane. The roof enlargement cannot overhang the outer face of the wall of the original house*.
      • Work on a loft or a roof may affect bats. You need to consider protected species when planning work of this type. A survey may be needed, and if bats are using the building, a licence may be required.

For further information in relation to permitted development loft conversion why not contact Design Studio Architects on 0116 251 0606 or email us at info@designstudioarchitects.co.uk

      • The ground area of the porch, measured externally, is not to exceed three square meters.
      • The highest part of the porch is not to exceed three meters.
      • No part of the porch is to be within two meters of any boundary that fronts a highway.

For further information in relation to permitted development porches why not contact Design Studio Architects on 0116 251 0606 or email us at info@designstudioarchitects.co.uk

      • On designated land outbuildings to the side of the house are not a Permitted Development.
      • Outbuildings are not permitted within the grounds of a listed building
      • In national parks, the Broads, Areas of Outstanding natural Beauty and World Heritage Sites the total area to be covered by any outbuilding more than 20 meters from ANY WALL of the house must not exceed 10 square meters to be a Permitted Development.
      • Outbuildings are not permitted forward of the principle elevation of the original house.
      • Outbuildings and other buildings must not exceed 50% of the total area of land around the original house. Sheds and all other outbuildings and extensions to the original house must be included when calculating this 50% limit.
      • The outhouse must not be used for living accommodation and must have no microwave antenna.
      • Outbuildings must be single storey with a maximum eaves height of 2.5 meters and a maximum overall height of 4m with a dual pitched roof, or 3 meters in any other case.
      • If the outbuilding is within 2meters of the property boundary the whole building should not exceed 2.5 meters in height.
      • Balconies are not a Permitted Development. Raised platforms such as decking are a Permitted Development provided they are no higher than 300mm
      • Containers such as those used for domestic heating purposes, must not exceed 3,500 litres capacity to be a Permitted Development. The other Permitted Development conditions which apply to outbuildings listed above also apply to containers.

For further information in relation to permitted development porches why not contact Design Studio Architects on 0116 251 0606 or email us at info@designstudioarchitects.co.uk

Please Note

Designated land includes national parks, B roads, areas defined as Outstanding Natural Beauty, conservation areas and World Heritage Sites.

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