The Housing Act 2004 provides a definition of what constitutes a HMO.
A HMO means a building (or part of a building, such as a flat), that:
A HMO requires a mandatory property licence when all the below apply:
On October 1, 2018, The Licensing of Houses in Multiple Occupation (Prescribed Description) (England) Order 2018, comes into effect and amends the definition of a HMO by removing the number of storeys from the licensable HMO criteria. This will mean that both two and single storey properties and a purpose built self-contained flat situated in a block comprising of no more than two self-contained flats, will now also require a licence where they are occupied by 5 or more persons, living in two or more separate households, with the sharing of amenities.
Here you can find more information about Houses in Multiple Occupation
The Council has made a "Small Houses in Multiple Occupation Article 4 Direction," under planning legislation. This applies to the whole of the Council area and came into effect on the September 14, 2017. The effect of the Article 4 Direction, is that planning permission is now required for a change of use from a dwelling house to a House in Multiple Occupation to accommodate between 3 and 6 persons. This is irrespective of whether the property is licensable as a HMO.
Here you can find out more about the Small Houses in Multiple Occupation Article 4 Direction