Do I need an HMO licence for 3 tenants? London licensing rules explained

If you’ve got three tenants living in your property, you might be thinking you’re safely below the threshold for any kind of HMO licence. A lot of landlords think the same. It sounds logical, fewer tenants, fewer rules. But that assumption has caught out more property owners than you’d expect.

HMO licensing in the UK isn’t simply a numbers game. Whether your property needs a licence depends on a mix of factors: who your tenants are, how they’re related, what kind of council area you’re in, and how your property is structured. Get any of those wrong and you could be looking at a serious penalty.

This post breaks down exactly when an HMO licence is required for three tenants, what the common pitfalls are, and what you need to do if your property qualifies.

Having three tenants doesn’t automatically require an HMO licence, but if those tenants form more than one household and share facilities like a kitchen or bathroom, your property is likely already classified as an HMO. Whether it then needs a licence depends on your local council’s rules, the property’s size, and any additional licensing schemes in your area.

That’s the short answer. Here’s where it gets a bit more layered.

Under national rules, mandatory HMO licensing applies to properties occupied by five or more people forming more than one household. So three tenants don’t hit that national threshold on their own. But many councils have introduced what’s called “additional licensing,” which extends HMO licence requirements to smaller properties, sometimes covering as few as three or four occupants.

The relationships between your tenants matter more than the tenancy paperwork. If your three tenants are all from separate households and share a kitchen or bathroom, that’s a textbook HMO. If they’re a couple plus a friend, they form two households, so it’s still an HMO.

Don’t assume you’re exempt just because you have fewer tenants than the national mandatory threshold. Your council may have already closed that gap.

Before you can work out whether your property needs a licence, you need to understand what actually makes something an HMO in the first place.

A House in Multiple Occupation (HMO) is broadly defined as a property rented out by three or more people who form more than one household and share common facilities, such as a kitchen, bathroom or toilet. That last part, sharing facilities, is what separates an HMO from a standard let where one family rents the whole place.

This is where landlords often get tripped up. A household isn’t just one person. It covers couples (married, in a civil partnership or living together as a couple) and close relatives, such as parents, grandparents, children, grandchildren, siblings, uncles, aunts, nephews, nieces and cousins, including step and half relations. So a couple counts as a single household, not two, and so does a parent living with their adult child. Three unrelated professionals in a shared house? That’s three separate households, making it an HMO.

If your property sits in an area with additional licensing that covers smaller HMOs, three tenants from separate households sharing your house is enough to require a licence. In a selective licensing zone, even a single-household tenancy may need one.

HMO licence requirements also come with conditions attached. Landlords must meet minimum room sizes, provide adequate fire safety measures, ensure proper waste disposal arrangements, and keep the property in a decent state of repair. A licence isn’t just a permission slip. It comes with ongoing obligations.

The biggest mistake? Assuming that because you have fewer than five tenants, the rules simply don’t apply to you. That mindset is responsible for a lot of the fines and licence enforcement notices councils issue every year.

Here are the slip-ups that come up again and again.

A landlord rents a three-bedroom house to what they believe is a group of friends. They write one tenancy agreement, collect one rent payment, and figure it’s a standard let. But the three occupants are unrelated, so they count as three separate households, and they share a kitchen and bathroom. The property is an HMO. The landlord didn’t realise. The council did.

This happens more often than you’d think. A single tenancy agreement doesn’t make a group one household. The law looks at who is living in the property and how they’re related, and councils look at who is actually living there, not just what’s written in the agreement.

Many landlords check the national rules, tick the “under five tenants” box, and move on. They never check whether their local council has introduced an additional licensing scheme. Some major cities and densely rented areas have had these schemes in place for years. If your property sits in one of those zones, you needed a licence before your third tenant even unpacked.

Licensing schemes get introduced, extended, and renewed. A property that didn’t require a licence two years ago might require one today. Landlords who set up a tenancy and then don’t revisit the rules are leaving themselves exposed.

Some landlords adapt properties, for example by splitting rooms or creating separate units for multiple occupants, without thinking about how that affects the property’s status. Whether a property is an HMO depends on who lives there and which facilities they share, but layout changes can alter which test applies, and a property let to more people than before may move into a different licensing or planning category. An en-suite on its own doesn’t make a property an HMO or take it out of the definition.

An Article 4 direction is a planning tool that removes certain permitted development rights in a specific area. In plain terms, it means that in certain locations, you can’t convert a standard family home into an HMO without first getting planning permission, even if you’d normally be allowed to make that change without asking anyone.

In most parts of England, converting a property from a single dwelling to a small HMO of up to six occupants doesn’t require planning permission. It’s covered under permitted development. But when a council introduces an Article 4 direction for HMO properties, that automatic permission disappears. You’ll need to apply for planning consent before you can operate an HMO in that area. If you plan to house seven or more people, the property is treated as its own use class (sui generis), which generally needs planning permission whether or not an Article 4 direction applies.

Areas with high concentrations of HMOs can experience changes in neighbourhood character, increased pressure on parking and local services, and a shift in the community balance. An Article 4 direction gives councils more control over where new HMOs can be created, particularly in student-heavy towns or inner-city areas where shared housing has grown rapidly.

The most direct route is your local planning authority. Most councils publish maps of Article 4 direction areas on their websites. You can also search the planning portal or contact the planning department directly. If you’re buying a property with the intention of letting it as an HMO, always check this before completing the purchase, not after.

It’s worth noting that an Article 4 direction affects planning permission, not the HMO licence itself. Even if you get planning permission to operate, you may still need a licence separately. The two requirements sit side by side.

If you’ve established that your property does need an HMO licence, the process to get one is fairly straightforward. It requires some preparation, but it’s manageable if you know what’s involved. A compliance partner such as Fantastic Corporate Services can arrange the certificates and safety works your council expects”arrange the certificates and safety works your council expects and help prepare your application documents, which takes pressure off the process.

1. Research your local council’s requirements. Start by visiting your local council’s website and searching for their HMO licensing section. Look for whether mandatory, additional, or selective licensing applies in your area. Each council has its own rules, fee structure, and application process, so don’t rely on generic guidance. Go straight to the source. If the website isn’t clear, phone the housing or private rented sector team directly.
2. Assess your property’s layout and tenant arrangement. Before you apply, be honest about how your property is actually being used. Map out which rooms are rented to whom, whether tenants form separate households, and what facilities they share. This isn’t just for the application. It determines whether you need a licence at all, and which category your property falls into. Getting this wrong at the assessment stage causes problems further down the line.
3. Prepare the necessary documents. Councils typically require a range of supporting documents: a floor plan of the property, gas safety certificate, electrical installation condition report (EICR), proof of ownership, and details of any managing agents. Some will also ask for fire alarm test records and an energy performance certificate (EPC). Gather everything before you start the application. Missing documents are the most common cause of delays.
4. Submit your application to the relevant council department. Most councils now accept applications online through their housing portal. You’ll fill in a form covering property details, occupancy information, and your contact details as the licence holder. You’ll also pay the application fee at this stage. Fees vary considerably between councils, so check in advance. Once submitted, you’ll receive a reference number and confirmation of receipt.
5. Arrange for a property inspection if required. Many councils will conduct a property inspection before granting an HMO licence. An officer will visit to check that the property meets the required standards, including room sizes, fire safety provisions, and general condition. If anything needs remedying, you’ll be given a schedule of works. Complete these promptly. Delays in meeting requirements can hold up your licence or result in conditions being attached to it.

Three tenants doesn’t automatically mean a licence, but it doesn’t mean you’re off the hook either. The real answer depends on who your tenants are, how they live, and what your local council requires. Those are three things worth knowing before you let the property, not after a council officer knocks on the door.

Check your local rules, understand your property’s status, and don’t assume that national thresholds are the whole picture. Staying on top of HMO licence requirements protects your tenants, protects your income, and keeps you on the right side of regulations that councils are actively enforcing.