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Article 393 [ added on 31-03-2010, updated on 03-06-2010 ]

Have you seen our Extensions 3D walkthroughs?

Planning Permission  

If the dwelling is situated in a “designated area” i.e. Conservation Area, Listed Building, National Park or Area of Outstanding Natural Beauty, Planning and other permissions may be required.

You may extend your house without applying for Planning Permission subject to certain conditions.

•    The extension must not cover more than half of the original land around the house.

•    No work must extend forward of the principal elevations fronting highways.

•    No extensions should be higher than the highest part of the existing roof.

•    Within two metres of the boundary the maximum eaves height is to be two metres.

•    The eaves and ridge height of an extension should match the existing dwelling.

•    External finishes (walls and roof) to match the existing dwelling.

•    Any flat roofs must not be put to veranda, balcony or platform use.

The following conditions apply to single storey extensions:

•    Single Storey extensions must not project more than three metres from the rear wall by three metres on an attached house, and by four metres on a detached house.

•    The single storey height cannot exceed 4 metres.

The following conditions apply to two storey extensions:

•    Extensions of two or more storeys must not project more than three metres.

•    There must be a minimum distance of 7 metres from the rear boundary to a two storey extension.

•    Extensions of two or more storeys should have a roof pitch matching the existing dwelling roof.

•    Any side facing window on an upper level is to be obscured glazed and set 1.7 metres above floor level.

Construction and installation of chimneys, flues and soil and vent pipes

Usually considered to be "permitted development" provided that the following conditions are met. Chimneys and flues to be kept one metre below the highest part of the roof.

Flue not to be fitted on the principal front and side elevations to highways.

The above applies to houses only not flats and maisonettes.

Building Regulations

Almost all extensions to dwellings require Building Regulations Consent.

Some non-habitable extensions are exempt from Building Regulations Control and do not require a formal application. In broad terms if the floor area is limited to 30 square metres, porches, verandas, covered ways and car ports are exempt. With particular reference to porches and verandas safety glazing must be installed in critical areas.

Additionally fixed electrical installations must comply with safety standards.  

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