CONSERVATORY CUBIC METERS

Detached and semi-detached properties may be extended without planning permission by up to 70 cubic metres or 15% of the volume of the original house, whichever is the greater to a maximum of 115 cubic metres.

If your home has been previously extended in any way, you will have eaten into some of the maximum permitted development you are allowed. You will need to include this in your calculations and if the maximum of 115 cubic meters is exceeded you might need to apply for planning permission.

When you are calculating the cubic meter size of the conservatory, bear in mind that the overall height of your planned conservatory must not exceed four metres when it is less than two metres from any boundary and that the height of the conservatory may equal the height of the house.

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