Is your property an HMO? HMO rules and licensing | August

Is your property an HMO? HMO rules, licensing and how to check

A surprising number of landlords are running a house in multiple occupation without realising it, and the gap between what feels like a simple let and what the law treats as an HMO is where expensive mistakes happen. Let to three sharers who each signed their own agreement and share a kitchen, and you are almost certainly there, with a different set of legal duties from an ordinary tenancy. This guide sets out how to tell whether your property qualifies, whether you need a licence, and what you have to do if the answer is yes. For the formal definition and its statutory basis, our dictionary entry on a House in Multiple Occupation sets it out in full.

Is your property an HMO? The test

Start with the standard test, which comes from the Housing Act 2004. Your property is an HMO if at least three people live there, they form more than one household, and they share an amenity such as a kitchen, bathroom or toilet. All three conditions have to be met.

The part that catches people out is "household". A household is one person, or members of a single family living together, including couples and people in a relationship. Unrelated sharers each count as a separate household. So three friends on separate agreements are three households, and the property is an HMO. A couple plus one unrelated lodger is two households. By contrast, a family of five is a single household, and letting to them is not an HMO however many people that is.

A practical way to check is to count households rather than heads, then ask whether they share facilities. A three-bedroom flat let to three unconnected professionals is an HMO. The same flat let to one family is not. There are also two less obvious routes in: a building converted into bedsits or rooms that are not fully self-contained can be an HMO, and a block converted into self-contained flats can fall within scope as a section 257 HMO where the conversion did not meet the 1991 Building Regulations and at least a third of the flats are privately let. If you are weighing up creating one deliberately, our guide to converting a property into an HMO covers the practical steps.

Do you need an HMO licence?

This is where most of the "do I need a licence for three tenants" confusion sits, and the answer depends on size and on your council. There are three regimes.

Mandatory licensing applies across England and Wales to large HMOs: five or more people forming two or more households who share facilities. Since the storey rule was removed on 1 October 2018, the number of floors no longer matters. Gov.uk sets out the large HMO licence requirements, and you apply to the local council, which charges a fee it sets itself.

Additional licensing is where smaller HMOs come in. Councils can designate schemes that require a licence for HMOs below the mandatory threshold, for example any property let to three or more people from more than one household. Selective licensing goes wider still, covering most or all private rentals in a designated area regardless of whether they are HMOs. Because these are local decisions, a property that needs no licence in one borough can require one a few miles away, so the only safe step is to check with the council. Our guide to licensing across England and Walesexplains how the schemes differ, and for the mandatory regime in detail see our guide to mandatory HMO licensing. Each property needs its own HMO licence, and the manager has to be judged a fit and proper person.

Planning and Article 4: a separate question

Licensing and planning are two different things, and a property can need attention on both. Under the use classes, a small HMO for three to six sharers falls in class C4, and a single dwelling is C3. In much of the country you can change from C3 to C4 under permitted development without a planning application. The catch is the Article 4 direction: a growing number of councils have removed that permitted development right in designated areas, so converting a family home into a small HMO there needs express planning permission. Larger HMOs, generally those for seven or more sharers, are sui generis and always need planning consent. Get the licence but miss the planning point and you can still be in breach, so check whether an Article 4 direction covers the address before you let.

What you have to do once you are an HMO

An HMO carries a heavier compliance load than an ordinary let. There are minimum room sizes set by the 2018 Prescribed Description Order: a room used for sleeping by one adult must be at least 6.51 square metres, by two adults at least 10.22 square metres, and by a child under ten at least 4.64 square metres. Fire safety is stricter than in a single let, typically interlinked mains alarms on every floor, fire doors with self-closers and clear escape routes; our guide to HMO fire safety requirements covers when each applies. An EICR is required every five years and a current Gas Safety Certificate at all times. On top of that, the Management of Houses in Multiple Occupation (England) Regulations 2006 place ongoing duties on the manager for the condition and upkeep of shared parts. And one common oversight: right to rent checks apply to every adult occupier in an HMO, not only the tenants named on the agreement, so build them into your right to rent checks process for the whole household.

One administrative point that changed recently: since 2023, most HMOs are valued as a single dwelling for council tax rather than banded room by room, with the landlord usually liable where tenants share facilities. It is worth confirming the banding with your local authority so the cost sits in the right place in your budget.

What it costs to get it wrong

The penalties are the reason this matters. Operating a licensable HMO without a licence is a criminal offence, and councils can issue a civil penalty of up to £30,000 per offence or pursue an unlimited fine on prosecution. Tenants or the council can apply for a Rent Repayment Order, and under the Renters' Rights Act, in force from 1 May 2026, that regime has been strengthened, with the maximum rising to up to two years' rent. Serious breaches can also bring prohibition orders restricting use of the property, and persistent offenders can be entered on the database of rogue landlords. There are knock-on commercial effects too: most lenders will not finance an unlicensed or non-compliant HMO, which can block a remortgage or a sale. When you set the licensing fee, fire safety works and ongoing compliance against the room income, the real return is lower than the headline per-room rent suggests; our HMO calculator models those costs against expected rents so you can see the net position.

Keep the paperwork in order

In practice, the landlords who pass a licensing inspection without drama are the ones whose paperwork is already assembled, because councils routinely ask for tenancy agreements, floorplans, safety certificates and maintenance logs as part of the process. Pulling that together at the point of application, from scratch, is where the stress comes from. August's document storage keeps the licence, floorplans, the EICR and gas certificate, and your fire alarm test log against each property, with renewal reminders, so the evidence is ready when the council asks rather than scattered across email.

Is an HMO worth it?

For all the obligations, a well-run HMO can pay well, because per-room rents add up and demand for shared housing is strong in many towns and cities. The properties that work are the compliant, well-documented ones: they meet the council's expectations, attract longer tenancies and produce steadier income than a corner-cutting let that risks enforcement. August now supports HMO tenancies, so you can track multiple tenants under one roof, store individual agreements and stay on top of licence renewals and safety checks; see how on the HMO landlords page.

A quick check

Your property is likely an HMO if three or more people live there, they are not all one family, and they share a kitchen, bathroom or toilet. It is likely to need a mandatory licence if five or more people from two or more households share facilities, and it may need an additional or selective licence below that depending on your council. If you are unsure, your council's private housing team is the definitive source, and most run an online checker or postcode tool.

HMO FAQs for UK landlords

Is my property an HMO? 

It is an HMO if at least three people live there, they form more than one household, and they share an amenity such as a kitchen or bathroom. Unrelated sharers each count as a separate household.

Do I need an HMO licence for 3 tenants? 

Not automatically. Three sharers make the property an HMO, but a licence is only required if your council operates an additional or selective scheme that covers it. Mandatory licensing starts at five or more people from two or more households. Check with the council.

How many tenants makes an HMO? 

Three or more people from more than one household sharing facilities. Five or more is the threshold for mandatory licensing.

Does an HMO need planning permission? 

Sometimes. A small HMO (class C4) can often be created under permitted development, but where an Article 4 direction applies you need express planning permission, and large HMOs (sui generis) always do.

What are the penalties for an unlicensed HMO? 

A civil penalty of up to £30,000 per offence or an unlimited fine on prosecution, plus a possible Rent Repayment Order, which under the Renters' Rights Act can now run to up to two years' rent.

The bottom line

If you have never thought of your property as an HMO, it is worth checking now rather than after a complaint or an inspection. The definition is broader than most landlords assume, the licensing depends heavily on where the property is, and the cost of getting it wrong has risen under the 2026 rules. Confirm the status, get the licence if you need one, and keep the compliance paperwork in order, and an HMO becomes a strong, manageable part of a portfolio rather than a liability.

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Disclaimer: This article is a guide and not intended to be relied upon as legal or professional advice, or as a substitute for it. August does not accept any liability for any errors, omissions or misstatements contained in this article. Always speak to a suitably qualified professional if you require specific advice or information.