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C3a class is a standard family/single occupancy dwelling. C4 class refers to small HMOs (of between 3 and 6 occupiers) and Sui Generis literally means “in a class of its own” and covers large HMOs of 7 or more people. You always need planning permission to move in and out of the Sui Generis use class, so any HMO of 7 or more people needs planning permission ...

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