Hounslow HMO Licence: Which Scheme Applies to Your Property

Three unrelated tenants sharing a kitchen in Hounslow means you need a licence — and most small landlords only discover this after a council warning letter lands on their doormat.

Two Active Licensing Schemes in Hounslow

The London Borough of Hounslow runs two HMO licensing schemes, both covering the entire borough with no ward-level exceptions:

Mandatory HMO Licensing applies to any property occupied by five or more people from two or more separate households who share a kitchen, bathroom or toilet. This is a national requirement under Part 2 of the Housing Act 2004, in force since the three-storey rule was removed on 1 October 2018.

Additional HMO Licensing catches smaller shared homes — three or four occupants from two or more separate households sharing amenities. Hounslow's current scheme (the fourth renewal) was designated on 11 September 2025 and runs from 11 December 2025 through 10 December 2030.

There is no selective licensing scheme in Hounslow. If you let a property to a single family or to two people forming one household, no licence is needed anywhere in the borough.

How Hounslow Counts Occupants and Households

Every individual counts, regardless of age — infants and children are full occupants for headcount purposes. A household is defined under section 258 of the Housing Act 2004 as members of the same family: married or cohabiting partners, children, parents, grandparents, siblings and step-relations.

Unrelated individuals each form their own household. Three professional sharers means three households and three occupants — enough to trigger additional licensing.

A common trap: a landlord lets a three-bed house to a couple and one single tenant. That is two households (three occupants), and the property needs an additional HMO licence. Many landlords assume a small let like this falls outside licensing requirements.

What Happens Without a Licence

Operating without a valid licence is a criminal offence under section 72 of the Housing Act 2004. Hounslow Council can pursue criminal prosecution (unlimited fine on conviction) or issue a civil penalty of up to £40,000 per offence. Tenants can also apply for a Rent Repayment Order worth up to 24 months' rent under the expanded provisions of the Renters' Rights Act 2025.

Beyond the financial penalties, an unlicensed landlord cannot serve a valid Section 8 notice on certain possession grounds.

Checking Whether Your Property Needs a Licence

Count every person living in the property across all tenancy agreements and informal arrangements. Map each person to their household under the section 258 definition. If you reach three or more people in two or more households sharing any amenity, you need a licence.

For borderline cases — properties near ward boundaries, mixed-use buildings, or converted flats — request written confirmation from the Housing Enforcement Team at [email protected]. Keep that confirmation in your compliance records.

Our Hounslow Landlord Licensing Guide walks you through the full classification decision step by step, including the section 254 and section 257 tests, with a worksheet you can fill in for each property.

Mandatory vs Additional: Which One Is Yours

The distinction matters because it determines which scheme your licence falls under, though the application process and portal are the same:

• 5+ occupants, 2+ households, shared amenities → mandatory HMO licence (national scheme; individual licences last for their granted term)
• 3–4 occupants, 2+ households, shared amenities → additional HMO licence (Hounslow local scheme, expires 10 December 2030)

If a property currently licensed under the additional scheme grows to five occupants, it falls under mandatory HMO licensing, which takes precedence over additional licensing. The property must be licensed under the mandatory regime.

Getting the classification right before you apply avoids paying fees under the wrong scheme. The Hounslow Landlord Licensing Guide includes a property classification worksheet that maps your occupancy to the correct scheme.

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