HMO or Single Let in South Wales? How to Decide

The short answer: a single let is usually simpler to buy, finance, manage and sell, while an HMO (a house in multiple occupation, where three or more unrelated people share facilities) can bring in more rent from one building but comes with extra rules, more management and more risk. In Wales, the extra rules start earlier than many investors expect, because turning a family house into even a small HMO normally needs planning permission. Which one suits you depends on the street, the local council's policies, your finance and how much time you can give it.

I'm Louis Lattuca. I've been in property for 17 years, buying since 2009, and our team has completed 900+ projects from our base in Cwm. This is general information to help you weigh the two options, not financial, legal or tax advice.

What counts as an HMO in Wales?

Under the Housing Act 2004, a property is generally an HMO if at least three tenants who form more than one household live there and share a kitchen, bathroom or toilet. A household means a family, so three friends sharing a house is an HMO, while a couple with their children is not.

A single let is a house or flat let to one household, such as a family, a couple or a single person, on one occupation contract.

Do you need planning permission for an HMO in Wales?

Usually, yes. Since February 2016, Welsh planning law has put small HMOs for three to six unrelated people in their own use class, C4. Changing a family house (class C3) into a C4 HMO needs planning permission in Wales. This is one of the clearer differences from England, where many areas allow that change without an application.

Larger HMOs with more than six residents fall outside the use classes altogether, so a planning application is needed for those too. Some councils limit how many HMOs they will allow in a street or area, so check the local development plan and any HMO policy before you make an offer, not after.

Will the HMO need a licence?

In Wales, mandatory HMO licensing applies across the country to HMOs of three or more storeys occupied by five or more people forming two or more households. Councils can also bring in additional licensing for smaller HMOs in particular areas. In South Wales, for example, Cardiff has additional schemes in Cathays and Plasnewydd, and Swansea runs one in the Castle, Uplands, Waterfront and St Thomas wards.

A licence brings fees, conditions on room sizes, amenities and fire safety, and a check that you're a fit and proper person to hold it. Schemes change, so ask the council directly about the exact address you're considering.

Which Welsh rules apply to both?

Whichever you choose, the Welsh basics are the same:

• Landlords must register with Rent Smart Wales, and anyone who manages a let themselves, or the agent who does it for them, needs a Rent Smart Wales licence.
• Since 1 December 2022, tenancies have been replaced by occupation contracts under the Renting Homes (Wales) Act 2016, and you must give contract-holders a written statement of the contract.
• The home must be fit for human habitation, with working mains-wired smoke alarms on every storey and an electrical condition report at least every five years.
• The property needs an energy performance certificate rated E or above to be let, unless an exemption applies.
• Land Transaction Tax, not Stamp Duty Land Tax, is paid on purchases in Wales, and higher rates usually apply if you already own a home.

An HMO adds to this list. You'll usually need tougher fire precautions, such as fire doors and linked alarms, HMO management regulations apply, and the landlord rather than the tenants is generally responsible for council tax on a shared house.

How do the running costs and workload compare?

A single let typically has one household, one set of bills paid by the tenant and fewer changes of tenant. You can often go months without hearing from a settled family.

An HMO usually means several contracts, rooms changing hands more often, bills included in the rent, furnishing, cleaning of shared areas and more wear on kitchens and bathrooms. The rent from the whole house may be higher, but so are the costs and the time involved. One empty room is a smaller dent than an empty house, although an HMO with several empty rooms can hurt quickly.

Maintenance matters more as the number of people in a house goes up. If you're letting from a distance, think about who will handle repairs before you buy; our property maintenance team works with landlords across South Wales.

What about mortgages and resale?

Many buy-to-let lenders will lend on a standard single let. HMOs often need a specialist HMO mortgage, and lenders may ask for landlord experience, a licence where one is required and planning status. Valuations can also differ: a single let is normally valued against similar houses nearby, while some lenders value larger HMOs partly on their rental income.

Selling is usually simpler for a single let, because you can sell to families, first-time buyers and investors. An HMO buyer pool is smaller, and you may need to reverse works if you sell it as a family home. Speak to a qualified broker about your own situation before you commit either way.

Which suits you in South Wales?

Rather than asking which is better, ask what the local demand is. Much of South Wales is made up of terraced streets in the valleys, where families and couples tend to rent. Shared housing demand is often concentrated in university cities, near large employers and hospitals, and in town centres with good transport.

A single let may suit you if:

• You're buying your first investment property or letting from elsewhere in the UK.
• You want lower management time and simpler finance.
• The street is mainly family housing with little demand for rooms.

An HMO may suit you if:

• There is proven demand for rooms in that exact area.
• The council's planning and licensing policies allow it.
• You have the budget for compliant works and the time, or a manager, to run it properly.

I talk through this decision regularly with the people I mentor in South Wales, using real properties they're looking at.

What should you check before you buy?

Before offering on either type, check the planning history and any council HMO policy, whether licensing would apply, the cost of works to meet the standards, realistic rent from local letting agents, and how you'd sell the property later. Get your numbers checked by someone who has done it before.

If you'd like a house found and refurbished for you, that's our property sourcing service. There's no upfront sourcing fee; you pay only once your purchase completes, and you're welcome on a free tour day from our Cwm office and live project sites.

If you'd rather make these decisions yourself with an experienced investor checking them, mentoring with me is £599 a month, with deal reviews, monthly calls and WhatsApp support on working days. You can apply for mentoring here, or read whether a property mentor is worth it first.