A UK HMO licence is required from the local authority when a rental property is let to multiple tenants from different households who share facilities. Mandatory licensing applies to HMOs with 5 or more occupants from 2+ households. Additional licensing — set by individual councils — can cover smaller HMOs.

This guide covers what HMOs are, when licensing applies, the application process, and the penalties for getting it wrong.

What is an HMO?

A House in Multiple Occupation (HMO) is a property let to:

• 3 or more tenants from 2 or more different households, who
• Share at least one facility — kitchen, bathroom, or toilet.

A "household" is typically: a single person, a couple, or a family unit. Three friends sharing = three households. A family of five = one household (even though more than 3 people).

A property let to a family of five sharing a kitchen is NOT an HMO. A property let to three unrelated professionals sharing a kitchen IS an HMO.

When is a licence required?

Mandatory HMO licence

Required nationally for HMOs that meet ALL three:

• 5 or more occupants, from
• 2 or more households, who
• Share at least one facility (kitchen / bathroom / toilet).

This applies to England universally. Wales and Scotland have similar but separately-codified schemes.

Additional HMO licence

Some councils designate Additional Licensing schemes covering smaller HMOs in their area — typically:

• HMOs with 3-4 occupants from 2+ households (those below the mandatory threshold).
• Whole streets or wards rather than individual properties.

Additional schemes need approval from the Secretary of State for schemes covering significant areas. They run for up to 5 years.

Selective Licensing

Distinct from HMO licensing — Selective Licensing covers ALL privately rented properties in a designated area (HMO or not). Some areas have both.

How to check

Check the council''s licensing page for the area where the property is located. Search "[council name] HMO licensing" or use the GOV.UK landlord licensing checker.

What an HMO licence requires

Licence conditions vary by council but typically include:

• Fit and proper person test for the landlord and any managing agent — no relevant criminal convictions, no past licensing breaches, no housing offences.
• Property standards — minimum room sizes, fire safety (interlinked smoke alarms, fire doors on bedrooms, fire blanket in kitchen), gas safety, electrical safety (EICR every 5 years), legionella risk assessment for water systems.
• Management standards — proper tenancy agreements, repair response times, complaints handling.
• Limit on occupants — the licence specifies the maximum number of people who can live there.

The standards are stricter than for non-HMO rentals — particularly fire safety and minimum room sizes.

Minimum room size standards

Mandatory HMO licences specify minimum bedroom sizes:

• For one person aged over 10: 6.51 m² (70 sq ft).
• For two people aged over 10: 10.22 m² (110 sq ft).
• For one child aged under 10: 4.64 m² (50 sq ft).

Rooms below these standards cannot be counted toward the maximum occupancy figure on the licence. Many older HMO conversions fail on minimum room sizes — converting them often requires structural changes.

The application process

1. Confirm whether mandatory or additional licensing applies to the property and council area.
2. Apply online through the local council''s licensing portal.
3. Pay the licence fee — varies widely by council, typically £500-£1,500 per HMO for a 5-year licence.
4. Provide evidence:
   • Property details (floor plan with room sizes).
   • Fire safety details (alarms, doors).
   • Gas Safety Certificate.
   • EICR.
   • Energy Performance Certificate.
   • Fit and proper person evidence (declarations, DBS in some councils).
5. Council inspection — typically before grant, with a follow-up inspection within 6 months.
6. Grant of licence — typically valid for 5 years.

Typical processing time: 8-16 weeks. Some councils faster, some much slower.

Penalties for operating an unlicensed HMO

Significant:

• Civil penalty: up to £30,000 per offence, imposed by the council.
• Prosecution: unlimited fines on conviction.
• Rent Repayment Orders (RRO): tenants (or the council on their behalf) can apply to the First-tier Tribunal for repayment of up to 12 months'' rent.
• Restriction on Section 21: cannot serve a Section 21 notice on a tenant in an unlicensed HMO.
• Banning Orders: serious repeat offenders can be banned from being a landlord nationally.

The RRO risk is particularly painful — losing 12 months'' rent for a multi-occupant property is often more than the fine itself.

Tenancies in an HMO

Most HMO tenants in England and Wales are on Assured Shorthold Tenancies. The licensing regime applies to the property; the tenancy law applies to each tenancy.

Note: when the Renters'' Rights Bill becomes law (expected 2025/26), ASTs will be replaced with a single periodic tenancy structure for all private rentals, HMO or otherwise. The HMO licensing regime is separate and unaffected.

Common mistakes

• Treating an HMO as a non-HMO: most often when the third household is added mid-tenancy. The moment 3 households + shared facilities + 3+ people is reached, HMO status (and possibly licence requirement) applies.
• Under-counting occupants: friends-of-tenants moving in informally take the property over the threshold. The licence must reflect actual occupancy.
• Missing additional licensing: assuming only the mandatory threshold matters, then discovering the council has an Additional scheme.
• Failing to maintain standards: a licensed HMO whose fire safety lapses can still trigger penalties.
• Forgetting the renewal: licences run for up to 5 years; missing renewal means operating unlicensed.

What to do if you operate an HMO

• Verify whether your property is in scope (mandatory and/or additional licensing).
• Apply for a licence before letting begins — don''t let to multiple tenants then apply retrospectively.
• Diarise the licence expiry and start the renewal 3 months ahead.
• Maintain the fire safety / gas safety / EICR cycle proactively, not reactively.
• Review the property layout against minimum room sizes — particularly relevant for converted houses.