HMO licensing crash course — UK landlord guide for 2026

What is an HMO?

HMO stands for “House in Multiple Occupation”. The legal definition sits in the Housing Act 2004. There are two key tests — Section 254 (the standard test) and Section 257 (the converted-building test). A property is an HMO if it meets either.

Section 254 — the standard test

A property is a Section 254 HMO if:

• 3 or more people live there;
• They form 2 or more separate households; AND
• They share one or more basic amenities (kitchen, bathroom, or toilet); AND
• The property is their only or main residence.

A “household” is a single person, couple, or members of the same family (including step-children, foster children, grandparents and live-in carers). Three unrelated friends sharing a flat = 3 households. A couple plus one friend = 2 households.

Section 257 — the converted-building test

A property is a Section 257 HMO if it's a converted block of flats that doesn't meet the 1991 Building Regulations standards and at least one third of the flats are occupied as short-term tenancies (typically AST or AT). Older converted houses split into flats often fall into this category — landlords usually don't realise.

Use our free HMO checker to work out whether your property meets the standard test, and which schemes apply in your council.

The three licence types

1. Mandatory HMO licence (national)

Required everywhere in England for “large HMOs” — properties with 5 or more occupants from 2 or more households sharing facilities. The “3 storeys” rule was removed in October 2018 — number of floors no longer matters.

Apply to your local council. Fees vary by area but typically £700 to £2,500 for a 5-year licence. Penalty for letting an unlicensed mandatory HMO: civil penalty up to £30,000 per offence, or unlimited fine on summary conviction.

2. Additional HMO licensing (council-designated)

Councils can designate areas where smaller HMOs (3 or 4 occupiers, sometimes Section 257 HMOs) also require a licence. Coverage varies wildly — Brent, Camden, Greenwich, Hammersmith & Fulham, Lambeth, Newham, Southwark, Waltham Forest and many others run additional schemes today.

See our council-by-council index for live schemes.

3. Selective licensing (council-designated)

Selective licensing applies to all privately-rented propertiesin designated areas — not just HMOs. A single-family let in a selective-licensing area still needs a licence. Schemes have grown dramatically since 23 December 2024, when the government removed the cap on scheme size — many councils are now rolling out borough-wide selective licensing without Secretary of State approval.

How they stack

A single property in a selective + additional area could need both a selective licence AND an additional HMO licence. A large HMO in such an area needs the mandatory licence, not the additional one (mandatory takes precedence).

The licence application

1. Apply to the councilvia their online portal or a printed form. Each council's process differs slightly.
2. Pay the fee— usually in two parts. Part 1 (application processing) at submission, part 2 (issue) when granted.
3. Provide a fit and proper person declaration— relevant criminal convictions, planning enforcement history, prior unlicensed-HMO offences.
4. Submit safety certificates— gas safety, EICR (5-yearly), EPC, fire risk assessment (HMOs), PAT testing for shared appliances.
5. Provide a floor plan showing room sizes (HMOs have minimum bedroom sizes that vary by occupant age).
6. Council inspects within their statutory timeframe. Issues improvement notices for any failings.
7. Licence granted— usually for 5 years. Conditions attached are binding (max occupancy, fire safety, regular gas/electric checks, complaints handling).

Minimum bedroom sizes (HMOs)

For mandatory and additional HMOs, statutory minimums apply:

• One person over 10: 6.51 m²
• Two persons over 10: 10.22 m²
• One person under 10: 4.64 m²
• Rooms under 4.64 m² cannot be used for sleeping at all.

These are statutory minimums. Many councils impose stricter local standards — often around 8-9 m² for single adult rooms — via their licensing conditions. Failing to comply is a licence breach in its own right.

Penalties for non-compliance

• Civil penalty up to £30,000 per offencefor letting an unlicensed licensable HMO. Under the Renters' Rights Act 2025, councils' enforcement powers and penalty caps have been substantially increased.
• Rent Repayment Order— the tenant can apply for up to 12 months' rent to be refunded to them. Successful RROs are now public record and feed into the “rogue landlord database”.
• Loss of possession route— you cannot validly serve possession notices on a tenant of an unlicensed HMO (Section 8 possession is also blocked in some grounds without a valid licence).
• Banning order eligibility— repeat offences can lead to a banning order, preventing the landlord from letting any property in England.
• Criminal recordon summary conviction — affects future right-to-rent, mortgage applications and licensing in other authorities.

Wales, Scotland and Northern Ireland

HMO licensing is devolved. Wales uses the Houses in Multiple Occupation (Wales) Regulations 2006 alongside Rent Smart Wales registration. Scotland licences HMOs of 3+ unrelated occupants under the Civic Government (Scotland) Act 1982, set locally by councils. Northern Irelanduses the Houses in Multiple Occupation Act (Northern Ireland) 2016 — NIHE managed centrally rather than by councils. This guide is England-specific.

FAQ

What if I'm not sure if my property is an HMO?

Start with our HMO checker — postcode-aware, runs the Section 254 test and shows any council schemes that apply in your area. If you're still unsure, contact the council directly — most have a free triage service, and getting it wrong is much more expensive than the phone call.

Can I avoid HMO licensing by limiting the number of occupants?

Yes — if you let to 2 or fewer people, or to a single family, it's not an HMO under the standard test. But check selective licensing in your area first — even a single-family let might still need a licence under a selective scheme.

What's an Article 4 direction and does it affect me?

Article 4 directions remove the permitted-development right to convert a C3 (dwelling) into a C4 (small HMO). In Article 4 areas, you need planning permission to use a property as a small HMO — even if it would otherwise be licensable. Many university cities operate Article 4 directions.

Do I need a licence for student lets specifically?

Yes — if it's their main residence (which student lets typically are during term). Students count as separate households unless they're from the same family. HMO licensing applies; the licence usually has student-specific conditions (academic year cycle handling, fire safety provisions).

How long does a licence last?

Usually 5 years, but councils can issue shorter licences (e.g. 1 year for a non-accredited landlord or one with prior compliance issues). Renew well before expiry — an expired licence means an unlicensed property.

Disclaimer: This guide is general information, not legal advice. HMO licensing is technical and the consequences of getting it wrong are severe. Always check directly with your local authority and consider specialist legal advice before letting an HMO or applying for a licence.