HMO Licensing: Mandatory and Additional Licensing, Standards and Fire Safety

Quick Answer: Houses in Multiple Occupation (HMO) require mandatory licensing in England if occupied by 5 or more people forming 2 or more households sharing facilities. Additional licensing schemes (extending to smaller HMOs) operate in many local authorities. Licensing covers: room sizes, fire safety, gas/electrical certification, waste management, manager fitness. Minimum room sizes 6.51m² (single), 10.22m² (double), no sleeping in rooms under 4.64m². Operating without a required licence is a criminal offence with unlimited fine.

Summary

Houses in Multiple Occupation (HMOs) are residential properties shared by tenants who are not part of a single household — typically student lets, professional shares, and bedsit conversions. The regulatory regime is significantly more demanding than for single-family lets, because the combined risks (fire spread between unrelated occupants, shared facilities hygiene, sleeping in undersized rooms) are higher.

The Housing Act 2004 introduced HMO licensing in England, with subsequent amendments (notably 2018 removal of the "three or more storeys" requirement). The Mandatory HMO Licensing scheme applies to any HMO with 5 or more occupants forming 2+ households. Local authorities can also operate Additional Licensing schemes (covering smaller HMOs) and Selective Licensing schemes (covering all rented properties in designated areas) under sections 56 and 80 of the Act.

For tradespeople, HMO work means tighter compliance: fire-rated doors, 30-minute compartmentation, emergency lighting, mains-wired smoke detection to BS 5839-6 Grade D Category LD2, fixed appliance gas certification, EICR every 5 years, and stricter room dimensions. For landlords, it means the licence application, the licence fee (typically £500–£1,500 per property for 5 years), property inspection by the local authority, ongoing compliance monitoring, and personal "fit and proper person" assessment. See hmo fire safety for HMO fire safety details.

Key Facts

Quick Reference Table

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HMO Category Trigger Licence Required Notes
Mandatory HMO (England) 5+ occupants, 2+ households Yes — licence Landlord must apply
Additional Licensing Local scheme — typically 3-4 occupants If in scheme area Check local authority
Selective Licensing All rented in designated area If in scheme area All landlords, not just HMO
Small HMO outside scheme 3-4 occupants No licence but standards apply Still subject to Housing Act standards
Single household share Family + lodgers No HMO licence Outside scope
Student let, fewer than 5 3-4 students Additional if scheme Mandatory if 5+

Detailed Guidance

What counts as an HMO?

The Housing Act 2004 (s.254) defines an HMO as a property:

"Household" includes married couples and civil partners, parents and children, related siblings, but excludes unrelated sharers and unrelated lodgers.

A 4-bed flat let to 4 separate students is an HMO (4 households). A 4-bed house let to a family of 6 is not an HMO (1 household).

Mandatory HMO licensing (England)

Apply to any HMO with 5 or more occupants from 2+ households. Application to the local authority (housing department), typically online. Fee covers:

Application includes:

Additional licensing schemes

Many local authorities operate Additional Licensing schemes covering smaller HMOs (3-4 occupants). The trigger varies — typically 3+ occupants from 2+ households. Check the local authority's housing pages.

Notable Additional Licensing areas:

A property may need an Additional licence even if it's below the Mandatory threshold.

Selective licensing

Selective Licensing covers ALL rented properties in a designated area, regardless of HMO status. Areas are designated where antisocial behaviour, low housing demand or other problems exist. Same fee structure as additional licensing.

Room sizes

Mandatory HMO licensing in England specifies minimum bedroom sizes:

Floor area is measured at floor level, including any floor space under a ceiling at least 1.5m high (so sloped roof rooms count the space ≥1.5m high).

These are minimums. Many local authorities specify higher standards.

Fire safety

HMO fire safety is more demanding than single occupancy:

Compartmentation

Escape routes

Fire detection

Gas and electrical certification

Manager duties

The named manager (landlord or appointed agent) has duties under the Management of Houses in Multiple Occupation Regulations 2006:

Fit and proper person

The licence applicant must demonstrate fitness:

Local authorities verify via DBS, court records, and prior housing enforcement history.

Compliance and inspection

Local authorities can:

Civil penalties and rent repayment

Operating an unlicensed HMO is a criminal offence under s.72(1) of the Housing Act 2004:

The local authority publishes a public database of HMO landlords and any enforcement actions.

Frequently Asked Questions

My customer has 4 student tenants — does the property need a licence?

In Mandatory HMO licensing alone, no (threshold is 5). But check whether the local authority operates an Additional Licensing scheme. Many do, and many cover 3+ occupant HMOs. Also check Selective Licensing — some areas require all rented properties to be licensed. Total possible licensing required: Mandatory + Additional + Selective in some cases.

Does a kitchen with a microwave only count as a kitchen?

Local authority definitions vary, but typically a "kitchen" requires cooking facilities (hob and oven, or equivalent), preparation surfaces, and storage. A microwave alone is not generally accepted as a kitchen for HMO purposes. Where rooms are let with own kitchen facilities (en-suite studio bedsits), each requires its own provision.

What about lodgers — am I an HMO if I take in 3 lodgers?

If you (the landlord) are also living in the property and the lodgers are not your family, the property may be a "resident landlord HMO" — generally outside Mandatory licensing but potentially subject to local Additional Licensing. The household definitions become important: 1 (you) + 1 (lodger 1) + 1 (lodger 2) + 1 (lodger 3) = 4 households. If 5+ total occupants (e.g. you + partner + 3 lodgers), Mandatory licensing applies.

Can I install electric blanket heaters instead of mains-wired smoke alarms?

No. Battery-only smoke alarms are not acceptable for mandatory HMOs. BS 5839-6 Grade D Category LD2 (mains-wired with battery backup, interlinked) is the minimum. The cost is modest (£300–£800 for installation in a typical 5-bedroom HMO) and the safety benefit is significant — battery alarms fail silently when batteries die.

What's the minimum kitchen size for a shared HMO kitchen?

Local authority standards vary. Typical minimums:

Each kitchen must have hob and oven, sink, food preparation surface, fridge/freezer, microwave, storage cupboards.

Do I need planning permission to convert to HMO?

Often yes. The Town and Country Planning (Use Classes) Order classifies dwellings as Class C3 (dwelling), C4 (small HMO 3-6 occupants), or Sui Generis (larger HMO 7+). C3 to C4 is permitted development in some councils, but many have an Article 4 Direction removing the permitted development right. Always check with the planning authority before converting.

Can a property be HMO licensed and not have fire doors?

Generally no. Mandatory licensing inspections check fire safety, and a property without protected compartmentation cannot satisfy fire safety standards. Older properties without fire doors can be licensed only after upgrade work (replace internal doors with FD30 doors and door closers, fit intumescent strips). Existing solid timber doors may be acceptable if they achieve effective FD30 — but the safe bet is purpose-made fire doors.

What's the difference between an HMO and a bedsit?

Bedsits (rooms with own cooking facilities and shared bathroom) are HMOs. Studio flats (own kitchen, own bathroom, separate flat) are typically not HMOs unless the building as a whole is a "converted block of flats" failing the 1991 conversion standards. Lines between bedsit, studio and small flat can blur — local authority will determine.

Regulations & Standards