You can have an extension or addition to your house that is considered to be
‘permitted development’, not requiring an application for planning permission
aslong as your development conforms to the following conditions.
• No more than half the area of land around the “original house”* would be
covered by additions or other buildings.
• Materials to be similar in appearance to the existing house.
• No verandas, balconies or raised platforms.
• Upper-floor, side-facing windows to be obscure-glazed; any opening to be
1.7m above the floor.
• Maximum eaves height of an extension within two metres of the boundary of
• Maximum eaves and ridge height of extension no higher than existing
• Side extensions to be single storey with maximum height of four metres and
width no more than half that of the original house.
• Two-storey extensions no closer than seven metres to rear boundary.
• Roof pitch of extensions higher than one storey to match existing house.
• No extension forward of the principal elevation or side elevation fronting a
• No extension to be higher than the highest part of the roof.
• Maximum depth of a single-storey rear extension of three metres beyond the
rear wall for an attached house and four metres beyond the rear wall 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
beyond the rear wall including ground floor.
• On designated land* no permitted development for rear extensions of more
than one storey.
• On designated land no cladding of the exterior.
• On designated land no side extensions.
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