Loft Extension with Rear Extension to follow under PD Volume Query

13 Apr 2015
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United Kingdom
Hello All, a quick question please, I looked at a house to buy today, a detached bungalow with a loft conversion that needed planning permission because there were dormers on the front.

Let's just suppose that the volume of the loft was say 45m3.

I would like to consider adding a single storey extension onto the back under PD. Would the volume of the new extension need to take into account the previous volume for the loft conversion or can I make the extension as big as PD would allow with no consideration to the volume of the space created by the previous loft conversion?
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That should be fine then so the extension would just be determined via Class A without worrying about Class B.
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