HMO Amenity Standards in Wales: 2026 Compliance Checklist

Minimum room sizes, bathroom ratios, kitchen requirements, and why the answer changes depending on which Welsh council you're dealing with.

In August 2025, Newport's planning committee spent part of a meeting arguing over 0.01 square metres. A proposed HMO bedroom in Liswerry measured one hundredth of a square metre above the council's minimum standard, and councillors asked officers to re-check the measurements before the conversion could go ahead. It scraped through.

That's the margin you're working with.

A month earlier, the same committee refused a three-bed HMO on Walmer Road over three things: an undersized bedroom, unsuitable bike storage, and bins too small for the number of occupants. Not fire safety. Not licensing. Bins.

Amenity standards are where Welsh HMO compliance gets granular, and it's where landlords, especially those used to English rules, most often come unstuck. Here's what actually applies in 2026.

The first thing to understand: Wales has no single national room size

Search online and you'll find the same two figures repeated everywhere: 6.51m² for a single adult bedroom, 10.22m² for a double. Useful benchmarks, and plenty of Welsh councils use figures in that territory as their starting point. But those numbers come from England's mandatory licensing conditions. In Wales, amenity standards for licensed HMOs flow from the Housing Act 2004 framework, and each local authority adopts and enforces its own version.

Which means the correct answer to “what's the minimum bedroom size for an HMO in Wales?” is always: it depends on the council. And the differences aren't trivial.

How the councils compare on bedroom sizes

Swansea's adopted standards are a good illustration of how much the presence of a communal lounge changes the maths:

Strip out the lounge and every single room in the property suddenly needs to be over 50% bigger. That one design decision can make or break a conversion.

Cardiff takes a different tack. Its guidance sets out expected sizes for communal rooms too , a lounge of 8.5m² for one person, rising with occupancy, and shared kitchens from 5.5m² for up to two people to 7m² for up to six. Interestingly, Cardiff sets no minimum size for bathrooms, only that there's enough room to change and dry yourself. The council is also explicit that its examples are a guide, and alternative layouts may be acceptable.

Newport, meanwhile, is precise about what counts as floor space in the first place. Its licensing standards measure only practical usable living space, excluding any area taken up by an en-suite, chimney breasts and small alcoves, and any floor where the ceiling height dips below 1.5 metres. That attic room with the sloping roof? Measure it Newport's way before you count it as a lettable bedroom.

Shared facilities: the ratios that matter

Where occupants share bathrooms, kitchens and WCs, the adequacy of those facilities is a core part of the licensing inspection. There is no single Wales-wide bathroom or WC ratio: many council standards use ratios around one bath or shower and one WC for every five occupants, but the exact combination and requirements vary by authority and occupancy. Check the current amenity standards for the council where the property is located.

Kitchens get similarly specific. Swansea's standards for exclusive-use kitchens, for instance, spell out the lot: a cooker with a 2–4 ring hob and oven (or microwave), a sink with drainer and constant hot water, a worktop of at least 1m × 0.6m, an under-counter fridge plus freezer, a 500mm storage cupboard, and sufficient electrical sockets. Shared kitchens scale up with the number of people using them.

And a detail that catches out older conversions: Newport's standards state plainly that baths and showers are not permitted in kitchens in shared accommodation. Sounds obvious. You'd be surprised.

Don't forget the boring bits, heating, waste and paperwork

Every unit of living accommodation must have adequate space heating, bathrooms must be heated and ventilated, and hot water must be constant, not an immersion switch hidden in a cupboard that nobody can find.

Waste provision is increasingly a make-or-break issue, as that Walmer Road refusal shows. Newport even publishes bin entitlements by household count, and Cardiff's planning guidance requires waste storage to be properly contained and designed in from the start.

Then there's the Wales-wide layer that sits on top of whatever your council requires: interlinked mains-powered smoke alarms, carbon monoxide alarms in each room containing a gas appliance, oil-fired combustion appliance or solid-fuel-burning combustion appliance, and electrical safety testing under the fitness for human habitation rules. The requirement to provide the contract-holder with the current EICR within 14 days of the occupation date is Wales-wide, not a Newport-specific rule. Landlords must also register with Rent Smart Wales, with licensing required where the landlord or appointed agent carries out licensable letting or management work. Operating an HMO that requires a licence without one is a criminal offence and can result in an unlimited fine on conviction; rent repayment orders may also be available in qualifying cases.

Your 2026 amenity standards checklist

Print it, walk the property with it, and be honest about the marginal rooms. As that Newport officer put it when the Liscombe Street bedroom squeaked past by 0.01m², compliant isn't the same as generous, and marginal rooms are exactly where councils, tenants and planning committees look first.

Important: We take care to ensure the information in our content is accurate and up to date, but property regulations, tax rules and market conditions can change. The information provided is general guidance only and should not be relied upon as legal, tax, financial or investment advice. Please speak to us about your individual circumstances and obtain appropriate professional advice before making significant property or investment decisions.