What Is an HMO?
A House in Multiple Occupation (HMO) is a property rented by three or more unrelated people who share facilities such as a kitchen or bathroom.
A mandatory licensable HMO is one that:
- Has 5 or more occupants from 2 or more households
- Has shared facilities (kitchen, bathroom, toilet)
In addition, many local authorities operate additional licensing schemes that extend HMO licensing requirements to smaller properties (often 3+ occupants). You must check with your local council whether any additional licensing applies in your area; additional HMO licensing in England sets out which smaller HMOs a scheme can cover. The HMO & landlord licence fees by council guide lists the mandatory, additional and selective fees for major UK councils with a link to each official page.
Why HMO Compliance Is More Complex
HMOs are subject to additional compliance requirements beyond the standard private rented sector rules. These include:
- Mandatory HMO licence
- Minimum room sizes
- Enhanced fire safety requirements
- HMO Management Regulations
- Planning permission (in many cases)
Failure to licence a mandatory HMO is a criminal offence with unlimited fines. Tenants in an unlicensed HMO can also apply for a Rent Repayment Order, forcing you to repay up to two years’ rent for offences from 1 May 2026.
HMO Licences
Who needs a mandatory HMO licence:
- Properties with 5+ occupants from 2+ households in England
How to apply:
- Contact your local housing authority
- Each council sets its own process and fees, so check the council's own page (the licence fees by council table links to each one)
- Licences usually last 5 years
- Renewal must be applied for before the existing licence expires
What licensing requires:
Minimum Room Sizes (England)
Every HMO licence in England requires a bedroom to be at least 6.51 m² for one person over 10, 10.22 m² for two people over 10 and 4.64 m² for a child under 10, with floor under a ceiling lower than 1.5 m left out (Housing Act 2004, Schedule 4, paragraph 1A). Many councils set larger sizes of their own.
The full rules, a worked loft measurement and three councils' own standards are in HMO room sizes in England.
Fire Safety Requirements for HMOs
HMOs have stricter fire safety requirements than standard lets:
- Fire doors: Required for bedrooms, kitchens and main habitable rooms
- Fire detection: Interlinked smoke alarms on every floor and in every room; heat detectors in kitchens
- Emergency lighting: Required in communal areas in larger HMOs
- Escape routes: Must be kept clear at all times
- Fire safety notices: Required in some HMOs
Your local fire authority may conduct inspections. Breaches can result in prohibition notices preventing occupation.
The written fire risk assessment, extinguishers and blankets, and how an HMO let room by room differs from a shared house on one joint tenancy, are in the fire safety guide for landlords.
HMO Management Regulations
The Management of Houses in Multiple Occupation (England) Regulations 2006 (SI 2006/372) apply to every HMO in England, licensed or not. The one exception is a converted block of flats under section 257 of the Housing Act 2004, which has its own regulations from 2007 (SI 2007/1903). The duties fall on the manager: the owner or lessee who receives the rents, and an agent who collects them for the owner (Housing Act 2004 s.263(3)).
What each regulation asks, as it reads on legislation.gov.uk (25 October 2026):
| Regulation | What it requires |
|---|---|
| 3 | Give every household the manager's name, address and telephone number, and display them in a prominent position in the HMO |
| 4 | Keep escape routes clear and in good repair, and fire-fighting equipment and fire alarms in good working order; display escape-route notices (not needed with four or fewer occupiers); make unsafe roofs and balconies safe or keep people off them; fit bars or other safeguards, where needed, at windows with a sill at or near floor level |
| 5 | Keep the water supply and drainage in good, clean working order, cover water tanks, protect pipes from frost, and never cut off water or drainage unreasonably |
| 6 | Send the council the latest gas safety certificate within 7 days of a written request, and never cut off gas or electricity unreasonably |
| 7 | Keep the common parts clean, in repair and reasonably clear, with lighting at all times, sound handrails and banisters and fixed stair coverings; keep shared appliances in good and safe repair; keep outbuildings, any garden and boundary walls in repair |
| 8 | Have each room and its furniture clean when each person moves in, and keep the room's structure, fixtures, appliances and windows in repair |
| 9 | Provide enough bins for each household and arrange for the rubbish to be taken away |
| 10 | (The occupiers' side) Let the manager in at reasonable times, give the information asked for, take care not to damage what the manager maintains, use the bins as arranged and follow the fire safety instructions |
Electrical safety left regulation 6 on 1 June 2020. The inspection at least every 5 years, and the duty to send the report to the council within 7 days of a written request, now come from the Electrical Safety Standards in the Private Rented Sector and Social Rented Sector (England) Regulations 2020 (SI 2020/312, reg 3, read on legislation.gov.uk 25 October 2026). The repair duties ask for a standard that is "reasonable in all the circumstances", taking account of the house's age, character and prospective life and its locality (reg 11(2)).
The penalty. Failing to comply with a regulation is a criminal offence (Housing Act 2004 s.234(3)), with a defence of reasonable excuse (s.234(4)), and the fine on conviction has no upper limit. The council can instead impose a civil penalty of up to £40,000 for conduct from 1 May 2026 (s.249A; £30,000 before then).
In LetCompliance the gas safety record and the EICR sit on the house record with their dates and copies, so a council's written request for either can be answered within the 7 days.
Does LetCompliance Cover HMOs?
Yes. As HMO landlord software, LetCompliance runs the let room by room: a separate tenancy record for each room, rent and arrears for each room, and rent collected by Direct Debit. For the house it holds the HMO licence with reminders before renewal, and the Gas Safety, EICR, EPC, deposit protection and Right to Rent records, just as for a standard let.
With more tenants, more certificates and a licence on top, an HMO is where keeping the whole let in one place pays off most.
For per-room tenancies on one address (active records, rent lines and reminders), see the companion guide: HMO multi-tenancy in LetCompliance.
Before you buy or convert: count the rooms that pass
Measure every bedroom before you buy or convert: a room under the minimum cannot be let as a bedroom, so the licence follows the rooms that pass, not the bedroom count in the particulars. Your council's own space standard is often higher than the national one.
How to measure, room by room, and what happens when a room falls short: how to measure an HMO bedroom.
Council tax on HMOs: the 2023 change that saved landlords money
This is the most useful thing that has happened to HMO landlords in a decade, and plenty still do not know about it.
Before December 2023 the Valuation Office Agency could band individual rooms in an HMO separately, so a five-room house might carry four or five council tax bands, billed to the tenants. It produced bad debt, disputes and tenants paying more than they would in a self-contained flat.
The Council Tax (Chargeable Dwellings and Liability for Owners) (Amendment) (England) Regulations 2023, in force from 1 December 2023, changed it. An HMO as defined in section 254 of the Housing Act 2004 is now treated as a single dwelling for council tax: one property, one band, one bill, and that bill goes to the owner, not the tenants.
The practical effect for most rent-inclusive HMO landlords is a lower total council tax bill, priced into the rent instead of chased across five tenants. Check the banding on any HMO you buy, because a property still showing multiple bands may need the VOA to reassess it. Full detail in the council tax on HMOs guide.
Planning: C4, sui generis and Article 4
Licensing and planning are separate systems, and being licensed does not mean you have planning permission.
- C3 is a dwellinghouse.
- C4 is a small HMO for three to six unrelated occupiers.
- Sui generis covers large HMOs of seven or more, which always need planning permission.
Converting a C3 house to a C4 small HMO is normally permitted development, so no planning application is needed. The exception matters enormously: where the council has made an Article 4 Direction, that permitted development right is removed and you need a full planning application.
Check for an Article 4 before you offer on a property, not after. See the Article 4 and HMO planning guide.
Rent Repayment Orders now reach further
Unlicensed HMOs are the classic Rent Repayment Order case: the tenants apply to the tribunal for repayment of up to two years' rent for offences from 1 May 2026.
From 1 May 2026 two things changed. The maximum was doubled, and repeat offenders can be required to pay the maximum. And RROs now extend to superior landlords, so in a rent-to-rent arrangement the property owner can be pursued as well as the operator who actually let the rooms.
If you have handed an HMO to a management company on a guaranteed-rent basis, the licence position is now your problem in a way it was not before. Confirm in writing who holds the licence, and check the register yourself rather than taking it on trust.
Sources and scope
- GOV.UK: House in multiple occupation (HMO) licence
- Legislation: Licensing of Houses in Multiple Occupation (England) Order 2018
- Legislation: Management of Houses in Multiple Occupation (England) Regulations 2006
Every source listed above is on GOV.UK, legislation.gov.uk or HSE and reviewed against the live source every quarter. This is guidance, not individual legal advice.
New Tenancy Document Checklist
What to give a new tenant in England, and when: before the tenancy is agreed, before they move in, and within 30 days of taking the deposit. With the source and the penalty for each.
- Written statement of terms before the tenancy is agreed
- Gas, electrical and EPC certificates before move-in
- Deposit protection and prescribed information within 30 days
- What not to give a new tenant any more
Frequently asked questions
When does a property need a mandatory HMO licence in England?
A mandatory HMO licence usually applies where 5 or more people from 2 or more households share facilities. Smaller HMOs may need additional licensing, so check with your local council.
What happens if I let an unlicensed licensable HMO?
You risk unlimited fines, prosecution and Rent Repayment Orders (up to two years’ rent for offences from 1 May 2026). HMO landlords should treat licensing and fire safety as non-negotiable.
Does putting everyone on one joint tenancy avoid HMO rules?
No, and this is the most expensive misunderstanding in shared housing. The test looks at who lives there and how, not at how many agreements you signed: three or more occupiers forming two or more households who share a kitchen, bathroom or toilet is an HMO. Three friends on a single joint tenancy are three households. Whether it needs a licence is a separate question, and letting a licensable HMO without one is an offence carrying a civil penalty of up to £40,000 for offences from 1 May 2026, plus Rent Repayment Order exposure.
What are the minimum room sizes in a licensed HMO?
In England, 6.51 m² for one person over 10, 10.22 m² for two people over 10 and 4.64 m² for a child under 10, and many councils set more. How to measure, and three councils’ own standards: HMO room sizes in England.
Who pays council tax on an HMO?
The owner, and this changed in landlords’ favour. Before December 2023 the Valuation Office could band individual rooms separately, so one house might carry four or five bills sent to the tenants. Since 1 December 2023 an HMO is treated as a single dwelling (one band, one bill), and the liability falls on the owner rather than the occupiers. For a rent-inclusive HMO the total bill usually falls; price it into the rent and check the banding on any HMO you buy.
