HMO Requirements for Landlords in England: Licensing, Room Sizes and Compliance

If you’re running a growing rental portfolio, there’s a good chance an HMO is already part of it or somewhere on your radar. HMOs can offer attractive rental returns, but they also bring extra responsibilities around licensing, room sizes, fire safety and, in some cases, planning permission.

Those rules are worth getting straight before you take on your first HMO. Something that is perfectly acceptable in a standard single let may not meet the requirements for shared accommodation.

Operating a property that should be licensed as an HMO without the required licence can now result in a civil penalty of up to £40,000, so it pays to know which rules apply before the tenants move in.

Jurisdiction note: This guide covers HMO requirements in England. Licensing, tenancy and housing rules differ in Wales, Scotland and Northern Ireland.

What counts as an HMO?

For the type of shared house most landlords mean when they talk about an HMO, the basic test is fairly straightforward.

A property will normally be an HMO where at least three people from two or more separate households live there and share facilities such as a kitchen, bathroom or toilet.

A “household” is not the same thing as a tenancy. Members of the same family generally count as one household, as do couples living together. Three unrelated friends sharing a house would normally form three households, while a family of five would usually form one.

That does not automatically mean the property needs an HMO licence. Licensing has its own thresholds.

Do you need a mandatory HMO licence?

Mandatory HMO licensing in England generally applies where a property:

• is occupied by five or more people
• contains people from two or more households
• meets one of the relevant HMO tests under the Housing Act 2004.

The old rule requiring an HMO to have at least three storeys disappeared on 1 October 2018. A qualifying two-storey house can need a mandatory licence just as a larger townhouse can.

For example, a four-bedroom house occupied by four unrelated sharers may be an HMO, but it falls below the national mandatory licensing threshold on occupant numbers. You would still need to check whether the council operates an additional licensing scheme.

A six-bedroom property occupied by six unrelated sharers is much more straightforward: it will normally fall within mandatory HMO licensing regardless of how many storeys the building has.

There are some wrinkles around converted properties and flats. Certain individual self-contained flats can require mandatory licensing where they meet the relevant occupation test.

Section 257 HMOs are different. These are certain buildings converted into self-contained flats that did not meet the required building standards when converted. The converted block itself is not automatically subject to mandatory HMO licensing, although councils can include section 257 HMOs within additional licensing schemes. An individual flat within the building may separately require mandatory licensing if it meets the relevant HMO test.

In simple terms:

• Mandatory licence normally needed: 5+ occupants, 2+ households, where the property falls within the mandatory HMO licensing rules.
• Below five occupants: mandatory licensing may not apply, but additional or selective licensing still might.

Additional and selective licensing: the schemes below the mandatory threshold

Falling below the mandatory licensing threshold does not necessarily mean you’re licence-free.

Additional licensing allows a council to require licences for HMOs that fall outside mandatory licensing, including smaller HMOs with three or four occupants. The exact coverage is local: some schemes apply across an entire council area, while others target particular wards or streets.

Selective licensing is different. It is not specifically an HMO regime and can apply to privately rented properties generally within a designated area. We’ve covered how selective licensing schemes work in more detail elsewhere.

Because both schemes are introduced locally, always check the licensing page for the council responsible for the property’s address. The rules in the neighbouring borough may be completely different.

You can also read our wider guide to landlord licensing rules outside the HMO-specific regime.

Applying for a licence: process, cost and timeline

Once you’ve established that a licence is required, the next step is applying to the local council.

The exact documents and information vary between authorities. You may be asked for property or floor plans, occupancy information, safety certificates, details of fire precautions and information about the proposed licence holder and manager.

The council must also be satisfied that the proposed licence holder and manager are “fit and proper” people. Relevant considerations can include previous housing-law offences, certain criminal convictions and other evidence that may affect someone’s suitability to manage licensed accommodation.

The licence holder is important because that person takes legal responsibility for complying with the licence conditions. It may be the property owner, although a managing agent can sometimes hold the licence instead.

Fees and processing times vary considerably between councils, so check the current application guidance and fee schedule for the property’s local authority rather than relying on a national estimate.

An HMO licence can run for up to five years. If you disagree with a decision or conditions attached to the licence, there is a right of appeal to the First-tier Tribunal.

Minimum room sizes and physical standards

Licensing is not just paperwork. Licensed HMOs also have to meet minimum physical standards.

National minimum sleeping-room sizes have applied in England since 1 October 2018:

Any part of the room where the ceiling is lower than 1.5 metres is excluded when calculating the usable floor area.

A room smaller than 4.64 sqm cannot be used as sleeping accommodation, and the council must be notified of any such room within a licensed HMO.

These figures are statutory minimums, not ideal room sizes. Councils can impose higher standards through their licensing policies and may also set requirements around kitchens, bathrooms, toilets and communal living space according to occupancy.

So a bedroom clearing the national minimum does not automatically mean the property meets every local HMO standard.

If you’re considering energy improvements at the same time, our guide to energy efficiency rules for HMOs covers that side separately.

Fire safety and management duties

HMOs have additional fire-safety and management responsibilities because several households may be sharing the same building.

The Regulatory Reform (Fire Safety) Order 2005 applies to the common parts of relevant HMOs and requires an appropriate fire risk assessment. That means considering issues such as escape routes, fire doors, alarms and other fire precautions.

The assessment should be kept under review and revisited where there is reason to think it is no longer valid, particularly after significant changes to the building, its use or its fire precautions.

Alongside this, the Management of Houses in Multiple Occupation (England) Regulations 2006 place day-to-day duties on HMO managers. These include maintaining common areas and escape routes, keeping relevant installations in repair, providing appropriate waste facilities and displaying the manager’s contact information.

Councils also use the Housing Health and Safety Rating System (HHSRS) to assess hazards within rented homes. Where a council identifies a Category 1 hazard, it has a duty to take appropriate enforcement action.

In practical terms, don’t treat fire safety as a certificate that can simply disappear into a folder. Keep the assessment available, deal promptly with anything it identifies and make regular checks part of the way the property is managed.

Our wider guide to fire safety regulations for landlords covers the rules beyond HMOs specifically.

Planning permission: when do you need it?

Licensing and planning are separate systems. Having an HMO licence does not automatically mean the property’s planning use is lawful, and getting planning permission does not remove the need for a licence.

A small HMO occupied by three to six unrelated people normally falls within planning use class C4. In many areas, permitted development rights allow a property to change from an ordinary C3 dwelling to C4 without a full planning application.

Larger HMOs housing seven or more people generally fall outside the C4 use class and are treated as sui generis. A change of use to a large HMO will normally require planning permission.

There is another important local complication: Article 4 Directions.

A council can use an Article 4 Direction to remove the automatic permitted development right to change a C3 home into a C4 HMO. Where one applies, you may need planning permission even for a smaller HMO.

Article 4 areas can cover particular neighbourhoods or streets rather than an entire council area, so check the local planning authority’s map and guidance for the specific property before assuming permitted development rights apply.

Where the Renters’ Rights Act overlaps with HMO rules

HMO licensing sits alongside the wider tenancy rules that apply across England’s private rented sector.

Where an HMO tenancy falls within the assured tenancy regime, the Renters’ Rights Act 2025 reforms introduced on 1 May 2026 apply in the same way as they do to other private assured tenancies.

Section 21 “no-fault” evictions have been abolished, and assured tenancies now operate under the new periodic tenancy framework rather than the old fixed-term assured shorthold tenancy model.

If you want the wider picture, our guide to landlord obligations under the Renters’ Rights Act covers the changes in more detail.

There are also particular considerations when deciding whether an HMO should use a joint tenancy or separate room-by-room agreements. We’ve covered those, including the rules affecting student HMOs, in our guide to HMO tenancy agreements.

Further Renters’ Rights Act reforms are still being phased in. The new Private Rented Sector Database is due to begin its regional rollout from late 2026. The Landlord Ombudsman is also being developed as part of phase two, with compulsory landlord membership currently expected later, in 2028.

Awaab’s Law does not currently apply to private landlords, including HMO landlords. The Renters’ Rights Act provides for it to be extended to the private rented sector in a later phase, but the implementation timetable is still to be confirmed.

What happens if you get it wrong?

HMO licensing rules have significant enforcement powers behind them.

Operating an HMO that requires a licence without having one is a criminal offence. If prosecuted, a landlord can face an unlimited fine.

Councils can instead impose a civil financial penalty. From 1 May 2026, the maximum civil penalty for certain Housing Act offences, including relevant HMO licensing offences, increased from £30,000 to £40,000.

Tenants or a local authority may also be able to apply for a Rent Repayment Order where a landlord has committed a qualifying offence, including certain licensing offences.

Licensing breaches can also have consequences beyond the immediate penalty. A landlord’s previous conduct may be relevant when a council later considers whether they are a fit and proper person to hold another licence.

The practical lesson is straightforward: check the licensing position before the property is occupied, rather than trying to resolve it after an enforcement officer gets involved.

Getting your HMO requirements straight

It helps to treat HMO compliance as a series of separate checks rather than one large licensing problem.

First, establish whether the property is an HMO and which licensing scheme applies. Then check the room and amenity standards, make sure the fire-safety and management duties are covered, and confirm the planning position separately.

Once those fundamentals are in place, the ongoing challenge is keeping track of licences, renewal dates, certificates and conditions across the portfolio.

That becomes harder as the number of rooms and properties grows, so it is worth having a reliable system for the admin rather than relying on memory, paper folders or disconnected spreadsheets.

If council tax is the next question on your list, who is liable for council tax on an HMO depends partly on how the property is let. We’ve covered that separately.