HMO Licensing in London 2026: The Complete Guide for Landlords

HMO licensing is one of the most frequently misunderstood areas of property law in England — and in London, where every borough operates its own additional schemes, the complexity is significantly greater than elsewhere. Getting it wrong means fines of up to £30,000, rent repayment orders, and a criminal record. Getting it right means operating one of the most profitable property strategies available in the UK today.

After more than 40 years in the London property market, I have seen landlords caught out by licensing changes at every stage. This guide gives you the complete picture as of August 2026.

What Is an HMO ?

A House in Multiple Occupation is defined under the Housing Act 2004 as a property occupied by three or more people from more than one household who share one or more basic amenities such as a kitchen, bathroom or toilet.

Three categories matter for licensing purposes:

• Standard HMO — 3-4 occupants from 2+ households sharing facilities
• Large HMO (mandatory licensing) — 5 or more occupants from 2+ households in any sized property
• Purpose-built flat above/below conversion — specific rules apply under Section 257

The Three Licensing Tiers

1. Mandatory Licensing

Since October 2018, mandatory HMO licensing applies nationally to any property rented to 5 or more people from 2 or more households. There is no minimum storey requirement — the previous 3-storey rule was abolished. Every large HMO in England requires a mandatory licence from the local authority.

2. Additional Licensing

Local councils can designate Additional Licensing schemes that extend the licensing requirement to smaller HMOs within their area. In London, this is extremely common. Many boroughs require licences for properties with as few as 3 occupants.

3. Selective Licensing

Selective licensing applies to all privately rented properties (not just HMOs) in designated areas. Several London boroughs operate selective licensing alongside additional licensing, meaning landlords may need multiple licences for the same property.

London Borough Licensing — August 2026

Always verify with the specific borough before purchasing — schemes are reviewed and renewed regularly, and boundaries change.

Article 4 Directions

Separate from licensing, Article 4 Directions remove the permitted development right to convert a property from C3 (dwelling house) to C4 (small HMO of 3-6 people) use without planning permission. Article 4 areas now cover significant portions of inner and outer London — including much of Islington, Haringey, Ealing, Brent, and others.

If a property is in an Article 4 area and is not already in lawful HMO use, you cannot convert it to an HMO without applying for planning permission, which is not guaranteed. This is a critical due diligence check before any HMO acquisition.

Licence Conditions and Room Sizes

Mandatory national minimum room sizes for HMO sleeping rooms (in force since October 2018):

• Single adult: minimum 6.51 sqm
• Two adults sharing: minimum 10.22 sqm
• Children under 10: minimum 4.64 sqm
• Rooms under 4.64 sqm cannot be used as sleeping rooms at all

Councils also impose conditions on fire safety (fire doors, interlinked alarms, emergency lighting), amenity provision (kitchen and bathroom ratios), and property management standards.

Penalties for Operating Without a Licence

The consequences of non-compliance are severe:

• Civil penalty — up to £30,000 per offence
• Rent Repayment Order — tenants can claim back up to 12 months of rent paid during the unlicensed period
• Criminal prosecution — unlimited fine on conviction
• Banning Order — can prevent you from renting property at all
• Loss of Section 21 rights — you cannot serve a valid Section 21 notice while unlicensed

How to Apply

Applications are made directly to the relevant local authority. Most London boroughs now have online application portals. You will need to provide details of the property owner, licence holder (if different), manager, and all occupants. A fit and proper person check is conducted on all licence holders.

Licences are typically granted for 5 years, though shorter periods can be imposed if conditions are not fully met. Licence fees vary by borough — typically £500-£1,500 for a 5-year licence.