What counts as an HMO, and how many people does it take?

In England, HMO status usually turns on people, households and shared accommodation, not on the label used in an advert. Across the UK, the operative HMO rule differs by nation, so England, Wales, Scotland and Northern Ireland cannot be reduced to one shared number.

What makes a house an HMO?

In England and Wales, a house is an HMO when it is living accommodation occupied by people who do not form one household, but a building occupied only by two people in two households is excluded for most Housing Act 2004 HMO purposes. The Housing Act 2004 standard test includes accommodation where “the living accommodation is occupied by persons who do not form a single household”, and Schedule 14 excludes “Any building which is occupied only by two persons who form two households.” That is why three tenants from different households usually triggers the practical HMO question, while two people do not need an HMO on that test. Scotland states the headcount directly: an HMO is “occupied by 3 or more persons” who are not all in one family or one of two families. Northern Ireland is different again: it needs three or more people and “more than two households”, so two families sharing is not enough there.

What counts as a household?

In England and Wales, a household is one person, a family, or another relationship treated as one household by regulations, so two unrelated couples are normally two households rather than one. GOV.UK puts the everyday rule simply: “A household is either a single person or members of the same family who live together.” The Housing Act 2004 family list is wider than many landlords expect because “relative” includes “parent, grandparent, child, grandchild, brother, sister, uncle, aunt, nephew, niece or cousin”; Scotland’s equivalent list omits cousin, and Northern Ireland has its own household test. A non HMO property can still be occupied by sharers if the national HMO threshold is not crossed, but affordability-based joint applications by two separate families bring the landlord into household-count, overcrowding, wear-and-tear and licensing territory rather than just tenant-referencing territory. Abodient can record HMOs at room-level occupancy, which matters because household and occupant counts are what decide the licence question.

Do children count towards the HMO occupant total?

Children count towards the HMO occupant total in England, Wales, Scotland and Northern Ireland; the English under-one exception is about room-size and maximum-occupancy calculations, not whether the property is an HMO. England’s mandatory-licensing Order uses the age-neutral test “is occupied by five or more persons”, and Oxford’s HMO guidance states the practical point directly: “Children are counted as equal to adults when determining whether a property is an HMO.” The confusion comes from separate space-standard rules: MHCLG guidance says that, for “calculating the minimum room sizes and/or the maximum number of occupants”, councils are expected not to count infant occupants under one. Northern Ireland also has a space-standard rule under which “a child aged 11 or less (but aged at least one) is to be counted as one-half of a person,” but that does not rewrite the HMO status test. Children may not be tenants, but they are occupants.

Is a house share the same thing as an HMO?

A house share is not automatically an HMO, but in England and Wales a shared house commonly becomes one when the Housing Act 2004 household and occupation tests are met. GOV.UK says an HMO is “sometimes called a ‘house share’”, while the LACORS fire-safety guide warns that “There is no legal definition of a ‘shared house’ and so this term can sometimes cause confusion.” The legal test still matters: a two-person house share is excluded for most Housing Act 2004 HMO purposes because Schedule 14 excludes “Any building which is occupied only by two persons who form two households.” Scotland describes an HMO in guidance as “a home occupied by three or more unrelated people who share bathroom or kitchen facilities,” while Northern Ireland requires more than two households. In practice, house share is a market description; HMO is the legal and licensing classification.

Is a bedsit an HMO?

A bedsit can be part of an HMO, but a bedsit is usually the rented room or unit while the HMO is the building or accommodation arrangement that meets the legal test. English guidance treats bedsit-style accommodation as part of the HMO landscape: MHCLG says the standard HMO test applies to “‘shared’ houses as well as the more traditional bed-sit type HMOs.” LACORS describes bedsit-type HMOs as properties “converted into a number of separate non-self-contained bedsit lettings or floor-by-floor lets.” Wales also groups “a shared house or flat” with “houses comprising of bedsits or rooms” in HMO guidance. Scotland’s statutory guidance is broader still, saying HMO legislation covers “ordinary houses, flats and bedsits” as well as hostels, student halls and staff accommodation. So bedsit vs HMO is not a clean legal choice: one describes the accommodation style; the other describes the regulated status.

Can a self-contained flat be an HMO?

Yes, in England and Wales a self-contained flat can be an HMO, and a converted block of self-contained flats can also be an HMO in its own right. Housing Act 2004 section 254 expressly includes “the self-contained flat test”, and section 257 covers converted blocks where “building work undertaken in connection with the conversion did not comply with the appropriate building standards and still does not comply with them.” The Act also makes clear that block-level status does not override flat-level status: “The fact that this section applies to a converted block of flats… does not affect the status of any flat in the block as a house in multiple occupation.” England then separates HMO status from mandatory licensing in one important case: government guidance says “A purpose-built flat situated in a block comprising three or more self-contained flats is not subject to mandatory licensing even if that flat is in multiple occupation.” Northern Ireland can also treat part of a building as HMO living accommodation. Abodient's building layer can hold a converted block of flats as a single structure with its HMO and per-flat status recorded together, which matters since block-level status doesn't override flat-level status.

Do student houses count as HMOs?

From 1 May 2026 in England, student housing run by the educational establishment stops being an HMO for the Housing Act 2004 except Part 1, but ordinary private student houses can still count as HMOs. The England/Wales residence rule treats occupation for full-time study as residence “for the purpose of undertaking a full-time course of further or higher education,” so a private student share is not outside the HMO regime merely because students live there during term. The new England educational-establishment exemption applies where the building is occupied by full-time students and “the person managing or having control of it is the educational establishment in question.” Scotland and Northern Ireland also treat term-time student occupation as only or main residence; Northern Ireland says a student occupying during term time is treated “as occupying that accommodation as the person's only or main residence.” Student houses are often three- and four-bed off-street houses, but the legal question is still household, headcount and management.

What is the difference between a small HMO and a large HMO?

In England, a five-person HMO is “large” for mandatory licensing but still “small” for planning if it has no more than six residents, so the answer depends on which regime is being applied. For mandatory licensing in England, MHCLG guidance says the HMO “must be occupied by 5 or more persons, from 2 or more separate households.” For planning, Class C4 covers “Use of a dwellinghouse by not more than six residents as a ‘house in multiple occupation’,” while government planning guidance says “Large houses in multiple occupation – those with more than six people sharing” are sui generis. Wales still has an extra mandatory-licensing condition: the HMO or part of it must comprise “three storeys or more,” as well as having five or more occupiers. Scotland has no statutory small/large split, and Northern Ireland licenses every HMO unless exempted.

How many people are legally allowed to live in a house?

There is no single UK-wide legal number for how many people can live in a house, a 3-bed house or a 1-bedroom flat; the legal limit comes from overcrowding rules, room sizes, planning, HMO licensing and any licence conditions. In England and Wales, the Housing Act 1985 space standard is a formula: it is breached when “the number of persons sleeping in a dwelling is in excess of the permitted number, having regard to the number and floor area of the rooms of the dwelling available as sleeping accommodation.” For licensed HMOs in England, one over-10 sleeping room must be at least “6.51 square metres,” and the licence itself fixes or approves the maximum number of people or households. Northern Ireland HMO licences must state “the number of persons who are authorised by the licence to occupy the HMO,” while Scotland uses local-authority suitability assessment rather than one national headcount.

Is an HMO three people or five?

Housing Act 2004 section 254 for England and Wales never says “3 people” — the test is only “not one household”; 3 is GOV.UK’s gloss, inferred from Schedule 14 excluding a 2-person/2-household building, while Scotland’s statute states “3 or more persons” outright. In England, five is the mandatory-licence threshold: the 2018 Order applies where the HMO “is occupied by five or more persons,” and MHCLG guidance adds that those people must be from “2 or more separate households.” Wales also uses five or more persons for prescribed HMOs but still has the three-storey condition. Northern Ireland needs both “3 or more persons” and “more than two households,” so a couple plus one lodger can be an HMO in England or Wales but not in Northern Ireland. Scotland and Northern Ireland license every HMO unless exempted; the five-person mandatory-licence split is England/Wales only.

Last reviewed September 2026.

Sources

• Housing Act 2004 s.254 — “the living accommodation is occupied by persons who do not form a single household”. Source
• Housing Act 2004 Schedule 14 — “Any building which is occupied only by two persons who form two households.” Source
• Scottish Government, HMO definition consultation — “HMO means any living accommodation occupied by 3 or more persons who are not all members of the same family or of one or other of two families, which is occupied by those three or more persons as their only or main residence”. Source
• Houses in Multiple Occupation Act (Northern Ireland) 2016 s.1 — “those persons form more than two households”. Source
• GOV.UK, Private renting: houses in multiple occupation — “A household is either a single person or members of the same family who live together.” Source
• Housing Act 2004 s.258 — “relative” means parent, grandparent, child, grandchild, brother, sister, uncle, aunt, nephew, niece or cousin”. Source
• Housing (Scotland) Act 2006 s.128 — “relative” means parent, grandparent, child, grandchild, brother, sister, uncle, aunt, nephew or niece”. Source
• Licensing of Houses in Multiple Occupation (Prescribed Description) (England) Order 2018 art.4 — “is occupied by five or more persons”. Source
• Oxford City Council, HMO glossary — “Children are counted as equal to adults when determining whether a property is an HMO.” Source
• MHCLG HMO licensing reform guidance — “For the purposes of calculating the minimum room sizes and/or the maximum number of occupants under the new Regulations, we would expect local authorities not to count any infant occupants under the age of one.” Source
• Houses in Multiple Occupation Act (Northern Ireland) 2016 s.43 — “a child aged 11 or less (but aged at least one) is to be counted as one-half of a person.” Source
• GOV.UK, HMO licence — “It's sometimes called a ‘house share’.” Source
• LACORS/CIEH fire-safety guide — “There is no legal definition of a ‘shared house’ and so this term can sometimes cause confusion.” Source
• Scottish Government, Private renting regulation — “A house in multiple occupation (HMO) is a home occupied by three or more unrelated people who share bathroom or kitchen facilities.” Source
• MHCLG HMO licensing reform guidance — “It applies, therefore, to houses whose characteristics resemble those of a conventional house in single occupancy, but which is an HMO by virtue only of its use, for example ‘shared’ houses as well as the more traditional bed-sit type HMOs.” Source
• LACORS/CIEH fire-safety guide — “These are HMOs which have been converted into a number of separate non-self-contained bedsit lettings or floor-by-floor lets.” Source
• Welsh Government HMO guidance for landlords — “This category includes a shared house or flat; houses comprising of bedsits or rooms and some hostels or bed and breakfast establishments.” Source
• Scottish Government statutory HMO guidance — “The legislation covers not only ordinary houses, flats and bedsits, but also other types of residential accommodation including hostels, student halls of residence, and staff accommodation in hotels or hospitals.” Source
• Housing Act 2004 s.254 — “the self-contained flat test”. Source
• Housing Act 2004 s.257 — “building work undertaken in connection with the conversion did not comply with the appropriate building standards and still does not comply with them.” Source
• Housing Act 2004 s.257 — “The fact that this section applies to a converted block of flats… does not affect the status of any flat in the block as a house in multiple occupation.” Source
• MHCLG HMO licensing reform guidance — “A purpose-built flat situated in a block comprising three or more self-contained flats is not subject to mandatory licensing even if that flat is in multiple occupation.” Source
• Housing Act 2004 s.259 — “for the purpose of undertaking a full-time course of further or higher education”. Source
• Housing Act 2004 Schedule 14 — “the person managing or having control of it is the educational establishment in question”. Source
• Houses in Multiple Occupation Act (Northern Ireland) 2016 s.3 — “as occupying that accommodation as the person's only or main residence.” Source
• MHCLG HMO licensing reform guidance — “For mandatory licensing to apply, the HMO (or Flat in Multiple Occupation) must be occupied by 5 or more persons, from 2 or more separate households.” Source
• Town and Country Planning (Use Classes) Order 1987 — “Use of a dwellinghouse by not more than six residents as a ‘house in multiple occupation’.” Source
• DCLG Circular 08/2010 — “Large houses in multiple occupation – those with more than six people sharing”. Source
• Licensing of Houses in Multiple Occupation (Prescribed Descriptions) (Wales) Order 2006 art.3 — “the HMO or any part of it comprises three storeys or more”. Source
• Housing Act 1985 Part X — “the number of persons sleeping in a dwelling is in excess of the permitted number, having regard to the number and floor area of the rooms of the dwelling available as sleeping accommodation.” Source
• Housing Act 2004 Schedule 4 — “6.51 square metres”. Source
• Houses in Multiple Occupation Act (Northern Ireland) 2016 — “the number of persons who are authorised by the licence to occupy the HMO”. Source
• Licensing of Houses in Multiple Occupation (Prescribed Description) (England) Order 2018 art.4 — “is occupied by five or more persons”. Source
• Licensing of Houses in Multiple Occupation (Prescribed Descriptions) (Wales) Order 2006 art.3 — “it is occupied by five or more persons”. Source
• Houses in Multiple Occupation Act (Northern Ireland) 2016 s.1 — “it is occupied by 3 or more persons as their only or main residence”. Source
• Housing (Scotland) Act 2006 s.124 — “Every house in multiple occupation (“HMO”) must be licensed under this Part unless it is exempted by or under section 126, 127 or 142.” Source
• Houses in Multiple Occupation Act (Northern Ireland) 2016 s.7 — “Every house in multiple occupation (“HMO”) must be licensed under this Act (unless a temporary exemption notice under section 15 is in effect in respect of it).” Source