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I intend to build a 2 storey 3m deep rear extension with a pitched roof to my house. I am confused as to what roof I can put on it, as the house has a dormer first floor and my extension will match that. Does the extended roof area fall within class B limitation of 50 cubic metres for a detached house? If it does, how do I calculate the increase, as the existing house only has habitable area in the roof?