Cardiff room rents are hovering around £600 a month — and in many better-quality house shares, £650 or more is now being advertised. So what does that mean for landlords and property investors looking at Cardiff and South Wales?
For years, much of the property investment conversation has focused on house prices.
But for an investor interested in income rather than simply capital growth, there is another number worth watching:
What will someone actually pay for a bedroom?
The latest Cardiff rental data gives us an interesting picture.
And it may make some landlords look at ordinary single-let properties differently.
Cardiff room rents: the Q3 2026 picture
There isn’t one definitive “Cardiff room rent”.
Student rooms, professional house shares, en-suite rooms, bills-inclusive accommodation and premium co-living can command very different prices.
But several independent data sources give us a useful picture of where the market currently sits.
| Period | Cardiff room-rent evidence |
|---|---|
| July 2026 | £600 pcm median asking rent for a room in a shared home |
| August 2026 | Around £600 pcm remained a common asking level, with many rooms advertised between roughly £500–£650 |
| September 2026 | £595 pcm median asking rent across 704 advertised house-share rooms |
| Latest SpareRoom benchmark | £647 pcm average Cardiff room rent, bills included |
Flatscout’s July data, compiled from live listings across Rightmove, Zoopla and SpareRoom, recorded a £600 median asking rent for rooms in shared homes, based on 341 available rooms.
View the Cardiff rental data on Flatscout.
By the end of September, Dwellio’s cross-portal dataset put the Cardiff house-share median at £595 per month, based on 704 advertised rooms.
View the Cardiff rental data on Dwellio.
Meanwhile, SpareRoom’s latest full quarterly dataset puts the average Cardiff room rent at £647 per month, up marginally from £645 a year earlier.
SpareRoom’s methodology is different: its figure is a mean asking rent and includes bills, which helps explain why it is higher than the cross-portal median.
View SpareRoom’s UK Quarterly Rental Index.
That distinction matters.
But the overall message is remarkably consistent:
Around £600 per month has become a serious benchmark for Cardiff shared accommodation, while well-presented all-inclusive rooms can sit comfortably above it.
What actually appeared on the market during Q3?
The individual adverts are perhaps even more revealing than the averages.
July included furnished rooms at £600 in Pentrebane Street, £625 in Llanishen and £750 in the city centre, all advertised as house-share accommodation.
A room on Cathedral Road in Pontcanna was advertised at £900.
August showed the same broad pattern.
Examples included £500 in Splott, £570 in Cathays, £585 near Cardiff University and £650 in Cathays and Whitchurch Road.
September listings again clustered around those levels, with examples including £575 in CF24, £600 on Colum Road, £650 in the city centre and £725 for another CF24 room.
That doesn’t mean every bedroom in Cardiff is worth £650.
Far from it.
But it does demonstrate that £600–£650 is no longer an exceptional asking rent for the right Cardiff room.
Compare that with where Cardiff was five years ago
This is where the longer-term numbers become particularly interesting.
SpareRoom reported that Cardiff’s average room rent increased from £443 per month to £661 between Q3 2020 and Q3 2025 — an increase of approximately 49%.
In Q3 2025 alone, Cardiff room rents were around 5% higher than a year earlier.
View SpareRoom’s Wales Q3 2025 rental data.
The more recent data suggests that the rate of increase has slowed.
SpareRoom recorded an average Cardiff room rent of £645 in Q2 2025 and £647 in Q2 2026 — just a 0.3% year-on-year increase.
That is an important distinction for investors.
The opportunity is no longer simply “rents are rising rapidly”.
The more interesting point is that rents have risen substantially over the longer term and, so far, appear to be holding at those higher levels.
The whole Cardiff rental market is moving too
Room rents shouldn’t be considered in isolation.
The Office for National Statistics recorded an average Cardiff private rent of £1,169 per month in July 2026, rising to £1,177 in August.
August rents were 3.5% higher than a year earlier.
View ONS housing and rental data for Cardiff.
For August 2026, the ONS recorded average Cardiff rents of:
- 1 bedroom: £908 per month
- 2 bedrooms: £1,085 per month
- 3 bedrooms: £1,211 per month
- 4+ bedrooms: £1,703 per month
For landlords, that creates an obvious question.
If a conventional property can be configured, licensed and operated legitimately as shared accommodation, does letting the property room-by-room produce a stronger income model than letting the same property to one household?
That calculation needs to be made property by property.
But it is certainly worth making.
A £600 room isn’t necessarily a £600 room
This is where inexperienced HMO investors can get caught out.
Seeing a £650 advertised room and multiplying that by six bedrooms does not automatically give you the property’s profit.
Room-by-room accommodation commonly brings additional costs that aren’t present — or aren’t present to the same extent — in a conventional single let.
These can include:
- Council Tax
- Gas and electricity
- Water
- Broadband
- Furniture
- Communal-area maintenance
- Cleaning
- Higher management intensity
- Licensing costs
- Greater tenant turnover
Cardiff Council also confirms that where individual occupiers have separate tenancy arrangements within an HMO, the landlord will normally be responsible for the Council Tax.
Read Cardiff Council’s Council Tax guidance.
So investors need to analyse net operating income, not simply headline rent.
That is particularly important when comparing a £1,500 single let with what initially appears to be £3,000 or £4,000 of room-by-room income.
Not every Cardiff house can simply become an HMO
This is probably the biggest warning for anyone finding a cheap terraced house online and assuming it can automatically become a five or six-bedroom HMO.
It can’t.
Cardiff Council states that planning permission is required for HMOs throughout the city.
A property occupied by three to six unrelated people falls within C4 use, while larger HMOs fall into the Sui Generis category.
Cardiff also considers existing HMO concentration within 50 metres when determining new applications.
The guidance says concentrations above 20% in Cathays and Plasnewydd or 10% elsewhere in Cardiff can be considered too high.
Read Cardiff Council’s HMO guidance.
That means the investment decision needs to start before the purchase, not after it.
Planning history, existing lawful use, licensing requirements, room sizes, layout, fire precautions, parking, local demand and achievable rent should all be examined before deciding what a property is worth to you.
Wales adds another layer landlords need to understand
A landlord entering the Cardiff market also needs to understand that renting property in Wales is not identical to operating in England.
Landlords letting domestic rental property must generally register with Rent Smart Wales.
Landlords carrying out their own letting or property management activity also generally require a Rent Smart Wales licence; alternatively, those activities can be undertaken by an appropriately licensed managing agent.
Read Rent Smart Wales landlord guidance.
That is why buying an HMO should not be approached simply as:
Buy house → add bedrooms → collect more rent.
The property, planning position, management model and tenant market all need to work together.
So is Cardiff still interesting for HMO investors?
The Q3 evidence gives us a fairly clear answer to a slightly different question:
There is still a substantial market for room-by-room accommodation in Cardiff.
Whether an individual property makes a good investment depends on its purchase price, finance costs, existing use, conversion costs, licensing position, management costs and achievable rent.
But Cardiff currently has several characteristics that make further investigation worthwhile:
- Room rents sitting broadly around the £600 level, with better rooms commonly advertised above that
- A large established student and professional house-share market
- Average private rents continuing to rise
- Substantial historical growth in Cardiff room rents
- Planning restrictions which make the existing lawful HMO stock potentially more significant
SpareRoom also reported that total UK flatshare supply fell 3.2% year-on-year in Q2 2026, ending three consecutive years of supply growth.
Wales’ average room rent reached £594, around 9.3% higher than three years earlier.
The investment opportunity therefore isn’t simply about squeezing another bedroom into a terraced house.
It is about finding the right property, in the right location, with the right planning position and the right room-rental strategy.
Before you buy another Cardiff investment property…
If you’re a landlord or investor considering Cardiff or South Wales, we believe the starting point should be the numbers.
Not the estate agent’s projected rent.
Not somebody’s spreadsheet from a property course.
And not an assumption that because a property has five bedrooms it will work as a five-bedroom HMO.
At Rooms in Cardiff, we have more than 20 years’ experience of room-by-room letting and HMO management in the Cardiff market.
If you are evaluating achievable room rents and operating costs, start with our free Cardiff HMO Profit Calculator. For help advertising rooms, managing enquiries and reducing turnover, see our HMO lettings and occupancy service in Cardiff.
We can help landlords assess:
HMO Management
For landlords who already own shared accommodation but don’t want the day-to-day management burden.
HMO Rent Guarantee
For suitable properties where a more predictable rental model may be appropriate.
High Yield Portfolio Builder
For investors who want to identify and assess Cardiff property based on achievable income, demand and operating model — rather than simply buying a property and hoping the numbers work afterwards.
Discover the High Yield Portfolio Builder
Thinking about buying, converting or changing the management strategy of a Cardiff rental property?
Speak to Rooms in Cardiff before you commit to the property.
We can help you look at the likely room rents, operating costs, management model and practical viability before you make the investment decision.
Because in an HMO investment, the deal isn’t the house.
The deal is whether the house works.
Cardiff room-rent figures are only one part of an investment decision. Room turnover, repairs, void periods and the time spent managing individual occupancies affect the result. If you are assessing whether to manage the property yourself or instruct an agent, explore what a specialist HMO management agent in Cardiff can cover before comparing management costs with expected rental income.
