HMO licensing in Wales

Two licences, two distinct obligations

Running a house in multiple occupation in Cardiff involves two separate licensing frameworks that are easy to confuse. The first is Rent Smart Wales — the registration and personal licensing scheme that applies to every landlord letting property in Wales. The second, sitting alongside it rather than replacing it, is HMO licensing under the Housing Act 2004. If your property meets the relevant threshold, you need both. This guide focuses on the HMO licence: which type applies to your property, what triggers the requirement, and what the application process actually involves.

What counts as an HMO for licensing purposes?

The planning definition of an HMO — the C4 use class covering three to six unrelated people sharing a dwelling — and the licensing definition under the Housing Act 2004 operate independently of each other. A property can require planning permission as an HMO without needing a licence, and vice versa. For licensing purposes, an HMO is a property occupied by three or more people who form two or more separate households and who share, or lack, at least one basic facility such as a kitchen, bathroom or toilet. A couple on a joint contract count as one household; three unrelated people each on individual room-by-room contracts form three separate households. That distinction matters because it determines whether the licensing framework applies at all.

Mandatory HMO licensing: the five-person threshold

Once a property meets the HMO definition above, mandatory licensing is triggered when it is occupied by five or more people forming two or more separate households. If your Cardiff property has five or more contract-holders sharing facilities, you must hold a licence from Cardiff Council before the property is fully occupied — not as an afterthought once all rooms are let. Operating without one is a criminal offence.

Cardiff Council issues the licence following an assessment of the property and the applicant. Licences typically run for up to five years, though the authority has discretion to grant a shorter period if, for example, outstanding works exist or questions about management standards arise. The licence is both property-specific and person-specific: if the property changes hands or if you appoint a new manager of record, Cardiff Council must be informed, and the incoming licence holder must submit their own application before operating the property as an HMO.

Additional HMO licensing in Cardiff

Mandatory licensing sets a national floor. Under Part 2 of the Housing Act 2004, Local Housing Authorities in Wales can also designate areas where a licence is required for smaller HMOs — those with fewer than five occupants — that fall below the mandatory threshold. This additional licensing power allows councils to address the specific pressures of high-density HMO neighbourhoods.

Cardiff Council has used this power and has operated additional licensing designations covering areas of the city with a higher concentration of shared accommodation. If your property falls within a designated area and meets the HMO definition, you will need a licence regardless of how many people live there. Because designations can be reviewed, renewed or extended over time, you should confirm the current position for your specific postcode directly with Cardiff Council's private housing team before assuming your property falls outside any scheme.

What an HMO licence application involves

An application to Cardiff Council typically requires you to demonstrate that the property meets the relevant standards and that you are a fit and proper person to hold the licence. Documents commonly requested include a current gas safety certificate, an electrical installation condition report (EICR) issued within the preceding five years, a valid energy performance certificate, evidence of fire detection and alarm provision, and a floor plan showing room dimensions and usage. For larger HMOs, a fire risk assessment carried out by a competent person will generally also be required. Cardiff Council sets its own licence fees and these change periodically — check the current fee schedule directly with the council before preparing your submission.

The fit and proper person assessment considers whether the applicant or proposed manager has relevant criminal convictions, has previously had an HMO licence refused or revoked, or has been subject to a banning order. If a managing agent is named on the licence, the agent must satisfy this test independently. In Wales, your agent must also hold a Rent Smart Wales agent licence — a separate requirement, but an equally important one to verify before appointing anyone to manage on your behalf.

The risk of operating without a licence

Letting a property that requires an HMO licence without one is a criminal offence under the Housing Act 2004. Cardiff Council actively investigates unlicensed HMOs, typically through contract-holder complaints or targeted enforcement activity in high-density HMO areas. Prosecution carries the risk of an unlimited fine; cases across Wales have resulted in penalties running into tens of thousands of pounds for landlords operating multiple unlicensed properties.

A further financial risk is the rent repayment order. Contract-holders in an unlicensed HMO can apply to the First-tier Tribunal for repayment of up to twelve months' rent paid during the unlicensed period. On a fully occupied Cardiff HMO generating, as a rough guide, several thousand pounds a month in gross rent, the exposure from a rent repayment order alone can be substantial — entirely separate from any criminal fine or the reputational damage of a public prosecution.

Keeping your licence current

An HMO licence does not self-renew. You must apply before the current one expires — Cardiff Council typically provides advance notice, but the obligation to act on time is yours. Material changes during the licence period — a new manager of record, significant structural works, or a notable change in the number of occupants — should be notified to the council promptly. A well-managed compliance calendar treats licence expiry dates with the same priority as gas safety and EICR renewal deadlines.