Know Your (Permitted Development) Rights!

Published on 5th April 2017
Planning can be a minefield, and even the most carefully planned and designed project can come a cropper at the planning stage. Nonetheless, some great structures can be created within permitted development rights.

Modern kitchen extension

For instance, adding a conservatory to a house is considered to be permitted development, not needing an application for planning permission, subject to the limits and conditions listed below:

    • No more than half the area of land around the “original house”[1] 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 three metres for an attached house and four metres for a detached house.
    • Maximum height of a single-storey rear extension of four metres.
    • Maximum depth of a rear extension of more than one storey of three metres including ground floor.
    • Maximum eaves height of an extension within two metres of the boundary of three metres.
    • Maximum eaves and ridge height of extension no higher than existing house.
    • Side extensions to be single storey with maximum height of four metres and width no more than half that of the original house.
    • Roof pitch of extensions higher than one storey to match existing house.
    • No verandas, balconies or raised platforms.
    • On designated land[2] no permitted development for rear extensions of more than one storey; no cladding of the exterior; no side extensions.

Provided building projects meet the permitted development rights criteria, a project, such as this side extension to a terraced property (below), following may not require planning permission. Apropos has its own planning team and will be able to direct you through the course of any planning matter

0847.dead sapce side extension (2)

The terraced property is improved immeasurably by the addition of a clever side extension, that makes fantastic use of dead space. The result is additional living space that extends the dining area sideways. A similar project by Apropos will cost approximately £20,000 (excluding VAT and building works).

Similarly, this cool kitchen and dining extension (below) runs the entire width of the property and adds an additional ½-1 metre to the length of the property, allowing light to flood into the property via a sloping, glazed roof. A similar project by Apropos will cost approximately £33,000 (excluding VAT and building works).


However, permitted development rights should not be taken for granted, and the advice to anybody who is considering an extension within permitted development rights is simple: seek advice from your local planning authority.

For further information about permitted development rights please click here or to discuss your plans with a member of our expert design team, arrange a consultation today.

[1] 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.

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

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