When do I need an HMO licence?

A mandatory licence is required for any HMO occupied by five or more people forming two or more households. Additional and selective licensing schemes can require licences for smaller properties, so always check the local council's rules.

What is the minimum room size in an HMO?

6.51 m² for one adult, 10.22 m² for two adults, and 4.64 m² for a child under 10. Rooms below 4.64 m² cannot be used for sleeping.

What fire safety do HMOs need?

Typically interlinked mains-powered alarms, fire doors and protected escape routes, emergency lighting where required, fire-fighting equipment in shared kitchens, and a documented fire risk assessment.

What is the penalty for an unlicensed HMO?

An unlimited fine or a financial penalty up to £30,000, a rent repayment order of up to 12 months' rent, and possibly a banning order.

Shared housingLegal requirement

HMO compliance: the landlord's complete guide

Houses in multiple occupation carry the strictest obligations in the sector — here's how licensing, fire safety, room sizes and management rules fit together.

Reviewed June 2026 · 13 min read

Mandatory licence

5+ people

Households

2+ households

Min room size

6.51 m² +

Penalty

Unlimited fine

What is an HMO?

A House in Multiple Occupation is a property rented to three or more people who form more than one household and share facilities such as a kitchen or bathroom. A 'household' is a single person or members of the same family. HMOs face additional rules because shared living raises fire and management risks.

Licensing

Mandatory HMO licensing applies to any HMO occupied by five or more people forming two or more households. On top of this, many councils run additional licensing (covering smaller HMOs) and selective licensing (covering ordinary lets) in designated areas. You must check the rules of the specific local authority before letting.

Licences are property and area specific

A property that needs no licence in one borough may require one next door. Always verify with the local council and apply before occupation — operating an unlicensed HMO is a serious offence.

Fire safety

A suitable fire detection system, often interlinked mains-powered alarms throughout.
Fire doors and protected escape routes appropriate to the size and layout.
Emergency lighting and clear signage where required.
Fire extinguishers/blankets in shared kitchens as specified.
A documented fire risk assessment, kept under review.

Minimum room sizes

Occupancy	Minimum floor area
One person over 10 years	6.51 m²
Two people over 10 years	10.22 m²
One child under 10 years	4.64 m²

Rooms smaller than 4.64 m² cannot be used as sleeping accommodation. Licence conditions specify the maximum number of occupants per room, and you must notify the council of rooms that fall below the standard.

Management regulations

The Management of Houses in Multiple Occupation Regulations place specific duties on the manager: displaying contact details, maintaining shared areas and installations, ensuring water and drainage work, dealing with waste, and keeping fire safety measures effective. These apply whether or not the HMO is licensable.

Inspection requirements

Councils inspect HMOs and use the Housing Health and Safety Rating System (HHSRS) to assess hazards. Licensed HMOs may be inspected as a licence condition, and gas safety, electrical safety and amenities standards are all examined. Keep all certificates and records readily available.

Penalties

Operating an unlicensed HMO can lead to an unlimited fine or a financial penalty of up to £30,000 per offence, a rent repayment order requiring you to repay up to 12 months' rent, and a banning order in serious cases. Breaches of the management regulations are separate offences.