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Tony1851 Many thanks - that's how I read it, but cubic capacity of 50m3 or less must cover most dormer extensions so we just wanted to check. Thanks again

Hi We are looking at doing a loft conversion but need a dormer on the back for the height of the bedroom & bathroom we are adding. The roof is currently a pitched roof - only used for storage. We are looking for clarification of what "additional roof space" actually means in Class B. Is it...