As above. There’s an alleyway that runs between the back of our garden and the back of the gardens in the next street. Rarely used except by one kid who carries out car repairs on his and his friends cars in the garage at the bottom of his garden. It’s approx 50m from their house but nearer to at least a dozen other houses than it is to his. Bit of an annoying prat - seems to think he can 'rev' any car better! Anyway, it’s always been a substantial sized garage to start with but today he and his dad (who I think is a builder) have taken the roof off and have made it approximately 2-3ft higher. Are there any rules/regs for the height or size of a detached flat roof garage? If so, I might have to get on to the planning department next week.