A house of multiple occupation is a building (or part of a building such as a flat) that:
- is occupied by more than one household and where more than one household shares, or lacks an amenity, such as a bathroom, toilet or cooking facilities
- is occupied by more than one household and which is a converted building, but not entirely into self-contained flats (whether or not some amenities are shared or lacking)
- is converted into self-contained flats, but does not meet as a minimum standard the requirements of the 1991 Building Regulations, and at least one third of flats are occupied under short tenancies
The building may be occupied by more than one household:
- as their only or main residence
- as a refuge of people escaping domestic violence
- by students during term time
- for other purposes described by the Government
People do not form a single household unless they are members of the same family. A household is defined as:
- families, including single people, couples and same sex couples
- other relationships, such as fostering, carers and domestic staff