HMO Licensing in London 2025: Thresholds, Additional Licensing and Mandatory Requirements

Operating an HMO in London without the correct licence is a criminal offence, not a civil matter. Fines of up to £30,000 per offence and Rent Repayment Orders covering up to 12 months of rent mean the financial exposure for non-compliant landlords is severe. Here is what you need to know for 2025.

What Is an HMO?

A House in Multiple Occupation is broadly defined as a property occupied by three or more people forming two or more separate households who share facilities such as a kitchen or bathroom. The precise definition in the Housing Act 2004 covers several categories, including bedsits, shared houses, converted flats and purpose-built student accommodation.

Mandatory HMO Licensing

Mandatory licensing applies nationally to HMOs that are occupied by five or more people forming two or more separate households. There is no exemption for property type — a large shared Victorian terrace and a purpose-built block both trigger mandatory licensing at this threshold.

Key requirements under mandatory licensing in London:

• Minimum room sizes: 6.51 m² for a single adult, 10.22 m² for two adults sharing
• Valid Gas Safe certificate renewed annually
• EICR (Electrical Installation Condition Report) no more than five years old
• Working smoke alarms on every floor, heat alarm in kitchen, interlinked throughout
• Carbon monoxide detectors in all rooms with gas appliances
• Adequate means of escape in case of fire, to the specification required by the local fire authority
• Adequate refuse and recycling facilities

Additional Licensing Schemes

Beyond mandatory licensing, London boroughs have broad powers under Part 2 of the Housing Act 2004 to designate Additional Licensing schemes covering smaller HMOs — typically those with three or four occupants. In 2025, the following London boroughs operate borough-wide or near-borough-wide additional licensing schemes:

• Newham, Waltham Forest, Brent, Haringey, Barking and Dagenham, Lewisham, Southwark, Tower Hamlets, Hackney, Lambeth and several others have active schemes.

You must check your specific borough's website — schemes change. Additional licensing fees typically range from £300 to £1,100 per property for a five-year licence. Some boroughs charge per bedroom.

Selective Licensing

Selective licensing applies to all private rented properties (not just HMOs) in designated areas where there are issues of low housing demand, significant anti-social behaviour or poor property conditions. Several London boroughs operate selective licensing schemes alongside additional HMO licensing. Check whether your property falls within a designated zone.

Licence Application Process

Applications are made through the relevant borough council's online portal. You will need to provide:

• Proof of ownership or management authority
• Gas Safety Certificate
• EICR
• PAT testing register for supplied appliances
• Fire safety risk assessment (required for larger HMOs)
• Floor plan showing room sizes and layout
• Details of the proposed licence holder and any manager

Consequences of Operating Without a Licence

• Unlimited fine on conviction in the magistrates' court (though civil penalties are capped at £30,000 per offence)
• Rent Repayment Order — tenants or the local authority can apply for repayment of up to 12 months' rent regardless of whether tenants were aware of non-compliance
• Banning Order — repeat offenders can be banned from renting out property anywhere in England
• Entry on the national database of rogue landlords

Key Changes for 2025

The Renters' Rights Act 2024, coming into force during 2025, introduces further obligations for all private landlords including HMO operators: mandatory membership of a landlord redress scheme, a digital Decent Homes Standard assessment process and enhanced local authority enforcement powers including proactive inspection programmes. Compliance is no longer about avoiding inspection — councils are beginning to inspect proactively in licensed areas.