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You will need to apply for planning permission to extend or add to your house in the following circumstances.

• You want to build an addition which would be nearer to any highway than the nearest part of the 'original house' unless there would be at least 20 metres between your house (as extended) and the highway. The term 'highway' here includes all roads, footpaths, bridleways and byways if they are public rights of way.

• More than half the area of land around the 'original house' would be covered by additions or other buildings.

Height limits for extensions

You will need planning permission before building an extension if;

• The extension is higher than the highest part of the roof of the original house

• Any part of the extension is more than 4 metres high and is within 2 metres of the boundary of your property. (Loft conversions and dormers have seperate rules.)

Volume limits on extensions

You will need planning permission before building an extension if;

• For a terrace house (including an end of terrace house) or any house in a conservation area, A National Park, an Area of Outstanding Natural Beauty or the Boards, the volume of the 'original house' would be increased by more than 10% or 50 cubic metres (whichever is greatest)

• For any kind of house outside those areas, the volume of the 'original house' would be increased by more then 15% or 70 cubic metres (whichever is greatest)

• In any case, the volume of the 'original house' would be increased by more than 115 cubic metres.

Note: 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.

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