Q: I would be grateful if you could clarify the time periods for immunity from enforcement action against dwellinghouses in the C3 use class and houses in multiple occupation (HMOs) in the C4 use class as defined by the Use Classes Order 1987 and subsequent amendments. I understand that C3 dwellinghouses are exempt from enforcement after four years. Does the same period apply to a class C4 HMO, or is it ten years? AW

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