The definition of an HMO is contained in sections 254 and 257 of the Housing Act 2004. An HMO can be a whole building or a part of a building (for example a block of flats might not be an HMO, but one of the flats within the block could be an HMO)
A building or part of a building that contains two persons sharing is not an HMO. Also, a building occupied by the owners household plus up to two lodgers is excluded.
If the property is not excluded as above, then a building or a part of a building is a house in multiple occupation:
A household is where all the persons are members of the same family. There are other prescribed descriptions for example an au-pair. A person is a member of the same family if:
A self contained flat will be an HMO if the self contained flat matches the criteria above (i.e. occupied by more than a single household, rents are payable etc.)
The definition of a self contained flat in the Housing Act 2004 is:
>> Certain converted blocks of flats - Section 257 HMO
Under section 257 Housing Act 2004, certain converted blocks of flats may be an HMO. A purpose built block of flats is not an HMO because the building must have been "converted" into self contained flats.
A converted block of flats is an HMO if it meets the following criteria:
Below is a table to show some examples of what does and does not constitute an HMO, if you are looking for information on HMO licensing please see Licensing of HMOs, or contact your council's Private Housing team [see Useful contacts for landlords]
DESCRIPTION | HMO? |
| 2 bedroom house or flat, 2 unrelated tenants | NO |
| 2 bedroom flat, one couple living as though married & one unrelated sharer | YES |
| 3 bedroom house, 3 unrelated tenants | YES |
| 3 bedroom house, brother, sister and cousin sharing | NO |
| Building converted into 3 flats, conversion does not meet building regulations 1991, one tenant in each flat | YES |