HMOs explained: is it the right investment, and how do you manage one well?
Houses in multiple occupation have been one of the most talked-about corners of the buy-to-let market for years, and it’s easy to see why: done well, an HMO can significantly outperform a standard single let on rental yield. Done without proper planning, it can just as easily become the most demanding property in your portfolio.
This guide covers both sides of that decision, whether an HMO is the right fit for you, and what actually goes into running one properly once you own it.
What counts as an HMO?
A property is generally an HMO if three or more tenants live there, forming more than one household, and share a kitchen, bathroom or living space. A household means a single person or people from the same family, so four unrelated sharers count as four households, while two couples sharing a property count as two.
A large HMO is defined as one with five or more tenants forming more than one household who share facilities. The old rule requiring the property to also be three or more storeys was removed some years ago, so single-storey and two-storey properties can also fall into the large HMO category if they meet the tenant and household threshold.
Typical HMOs include shared houses let room-by-room, student lets, and some types of shared professional accommodation, provided rent is paid and the property is the tenants’ main residence.
Licensing: the part that catches people out
This is the single most important thing to get right before buying.
- Mandatory licensing applies to any large HMO, five or more tenants from two or more households sharing facilities, regardless of how many storeys the building has.
- Additional licensing is a discretionary scheme that individual local councils can introduce, extending licensing requirements down to smaller HMOs (often three or four occupants) within a designated area. Whether this applies depends entirely on where the property is, so it’s essential to check with the relevant council before buying, not after.
- Selective licensing is a separate, broader scheme some councils run covering all rented properties in a designated area, HMO or not.
Operating an HMO without the licence it needs is a criminal offence. Landlords can face civil penalties, and tenants can apply for a rent repayment order covering up to 12 months of rent paid. Penalty levels have also increased in 2026, so this isn’t a risk worth taking a chance on. (smartsleepproperty.co.uk, realyield.co.uk)
Licences are issued by the local council, typically valid for five years, and a separate licence is needed for each property. If you’re buying an HMO, get legal advice and confirm the licensing position, building control requirements, and fire safety obligations before you commit, not as an afterthought.
What’s changed under the Renters’ Rights Act
The Renters’ Rights Act, in force since 1 May 2026, didn’t change HMO licensing rules directly, but it did change the tenancies inside HMOs. Fixed-term assured shorthold tenancies have gone, every letting (HMO rooms included) is now a periodic assured tenancy, and Section 21 “no-fault” eviction no longer applies. If you’re managing an HMO with regular tenant turnover, this is worth understanding properly before you take on new tenants, since the process for ending a tenancy has changed. (realyield.co.uk)
For a fuller breakdown of what the Act means in practice, our free guide, A Practical Guide to Renter’s Rights, covers the key areas landlords should review and the steps that can help avoid costly mistakes. With multiple tenancies to keep track of in a single property, it’s a particularly useful download if you run an HMO.
The case for adding an HMO to your portfolio
Higher rental yields. HMOs have consistently produced stronger gross yields than equivalent single lets, since you’re being paid per room rather than for the property as a whole. The exact premium varies significantly by area and property type, so it’s worth getting a realistic yield comparison for your specific target property rather than relying on national averages.
More resilient income. With several tenants under one roof, one person falling behind on rent doesn’t wipe out your income the way it would with a single-let tenant. Risk is spread across multiple tenancies rather than resting on one.
Fewer properties, similar income. Because per-property yield is higher, some investors can generate comparable income from two or three well-run HMOs as they would from a larger number of single lets, which can mean less time spent managing a sprawling portfolio.
The case against, or at least, what to weigh up
Regulatory complexity. Licensing, fire safety, room size requirements and (potentially) planning considerations mean HMOs carry meaningfully more compliance overhead than a standard buy-to-let. Many landlords bring in a specialist managing agent for exactly this reason, which adds to costs but reduces risk.
Harder, pricier financing. Standard buy-to-let mortgages don’t cover HMOs. You’ll need a specialist HMO mortgage, typically with a larger deposit requirement and more scrutiny of your experience as a landlord, and first-time HMO buyers can find their lender options genuinely limited. This is exactly the kind of thing worth speaking to a broker about before you make an offer, not after, see the HMO mortgages section of our buy-to-let page for how this works.
Tenant turnover. HMOs, especially student and young professional lets, tend to see higher turnover than single lets, which means more frequent void periods, referencing, and re-letting work.
If you decide to go ahead: a few things worth getting right early
- Get clear on your strategy before you buy: your budget, your target return, how hands-on you want to be, and your exit plan.
- Check the licensing position (mandatory, additional and selective schemes) with the local council for that specific property before you commit to buying it.
- Confirm whether the property needs planning permission for a change of use (this varies by area and by HMO size), and get legal advice early rather than after exchange.
- Location matters as much as it does for any let: proximity to a university or transport links and employment hubs, depending on who you’re letting to.
- Budget realistically for higher financing costs and ongoing compliance, and factor in a managing agent if you don’t want to handle licensing, maintenance and tenant turnover yourself.
- Build slowly if this is new to you. Most lenders prefer borrowers with some landlord experience before considering an HMO application, so a first HMO is often easier to finance once you’ve got at least one standard buy-to-let under your belt.
Financing an HMO
HMO mortgages sit outside standard buy-to-let products, and criteria vary a lot by lender, particularly around the number of lettable rooms, licensing status and how rental income is calculated. Rates and product availability change frequently enough that quoting a specific figure here would be out of date within months, so rather than do that, the more useful step is speaking directly to a broker who places HMO mortgages regularly.
Our buy-to-let mortgage team has experience placing HMO mortgages across the market, including for portfolio landlords and limited company structures, and can talk you through what’s realistically available for your specific property and experience level. Book a free consultation to talk it through.
