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Expansion of Permitted Development Rights

Permitted Development Rights are a form of blanket planning permission granted nationwide for certain types of development including (but not limited to) enlargements, improvements and alterations to dwellings, additions and alterations to the roofs, the erection of a porch to an existing dwelling and outbuildings incidental to the enjoyment of a dwelling. Each of these works are subject to conditions - MHCLG's Technical Guidance on Permitted Development Rights for Householders outline such conditions and other permitted works under the act. However, please note that this document does not include the recent expansion to the Permitted Development Rights, which have been implemented to support economic recovery from the pandemic and to boost housing supply. Details on such expansion of the Rights are laid out below -

Amendments to the General Permitted Development Order (2020) have conferred permitted development rights allowing existing houses to be extended by way of the addition of up to two storeys for existing two-storey dwellings and one storey for existing one-storey dwellings. You must apply for prior approval from the LPA prior to commencing such works, to ensure the viability of the development. The rights do apply to listed buildings, though listed building consent will be required.

The rights do not apply to:

  • buildings converted to residential under permitted development rights

  • conservation areas, areas of outstanding natural beauty, the Broads, national parks, world heritage sites and SSSIs

  • buildings constructed before 1 July 1948 or after 28 October 2018

  • where the existing dwelling house has been enlarged already by the addition of one or storeys whether under permitted development or otherwise

There are other restrictions:

  • following the works, the height of the highest part of the roof

    • cannot exceed 18m or the highest part of the roof as existing by more than 3.5m for one storey dwellings or 7m otherwise

    • cannot exceed by more than 3.5m the highest part of the roof of:

      • for semi-detached houses, the building with which it shares a party wall

      • for terraces, every other building in the same row

  • the internal floor to ceiling height of additional storeys cannot exceed the lower of 3m and the existing height of any storeys in the principal part of the existing house

  • the new storeys must only be constructed on the principal part of the house i.e. the main part, excluding extensions of lower height whether original or subsequent

  • no visible support structures on or attached to the exterior on completion are allowed

  • no windows are allowed in walls or roof slopes on side elevations and the roof pitch of the principal part must be the same

  • the materials used in exterior works must be of similar appearance to the existing

Consideration also needs to be given to the standard provisions of the General Permitted Development Order, including where existing permissions disapply permitted development rights under Article 4 Directions.