HMO vs Single-Let in 2026: What Ten Years of Cashflow Really Reveals

Hi Angela. We are unpacking "HMO vs Single-Let in 2026: What Ten Years of Cashflow Really Reveals" today and tying it back to the wider Cost Saver ecosystem, including tools like HMO vs Single-Let Profit Simulator · 10-Year Cashflow, so you can turn insights into action quickly.

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Yeah, cheers Angela, good to be back. And this is — I mean, this is one of those topics where there's just so much noise and not enough... actual maths, you know?

Yeah, and that's — that's exactly the trap, isn't it. So just to set the scene: a typical single-let might offer a gross yield of around five and a half to seven point two percent. An HMO, professionally run, can advertise ten and a half to fourteen and a half percent. On a quick spreadsheet, the HMO wins by a mile.

It is! But — and this is sort of the whole point — most landlords build that spreadsheet for year one and then just... stop. And the trouble is, over a decade, the costs that are sitting quietly in the background start to compound. The gap narrows considerably.

So there are four main ones, and I think each one sounds kind of manageable on its own. It's when you stack them together that it gets... yeah. Uncomfortable. The first is what I'd call operational friction. In an HMO, the landlord typically covers utilities, broadband, often council tax. So when energy prices go up, that hits you directly.

Exactly. The tenant pays the bills and council tax, which keeps the landlord's exposure pretty low. The second big one is replacement cycles. Furniture, appliances, fire safety equipment, decoration — in an HMO, all of that tends to need renewing every three to four years. In a well-kept single-let, you're looking at more like seven to ten years.

Yeah, it's just wear and tear, isn't it. And then there's turnover and voids. Room-by-room churn creates constant small gaps — re-letting effort, admin, sometimes a room sitting empty while the others are full. And the fourth one is compliance and management. Licensing, inspections, safety certificates — all of that costs time or money, usually both.

None of it. Gross yield is just annual rent divided by purchase price. It tells you nothing about what it actually costs to earn that rent. It's — honestly, it's more of a marketing number than anything else.

Yeah, so — and I want to be upfront that these are illustrative figures, right, round numbers to show how the maths works. You'd replace them with real quotes and local rents for your own situation. But the method is the same. So, single-let first. Imagine a three-bedroom house, bought for two hundred thousand pounds, let for a thousand a month. That's twelve thousand a year — six percent gross yield.

Now you start taking off costs. Letting agent management at ten percent — that's about twelve hundred pounds. Maintenance and repairs, about nine hundred. Landlord insurance, about three hundred and fifty. A void allowance of four percent, so about four hundred and eighty. Compliance certificates and sundries, about three hundred. You add all that up, you're left with roughly eight thousand seven hundred and seventy a year before finance and tax.

It is. That's about four point four percent of the purchase price in net terms. Now the HMO. Five-bedroom property, bought and converted for two hundred and sixty thousand. Five rooms at five hundred and fifty a month each, bills included. That's thirty-three thousand a year — roughly twelve point seven percent gross.

Right. But look at the costs. Management at fifteen percent — that's about four thousand nine hundred and fifty. Utilities and broadband, about four thousand eight hundred. Council tax, about sixteen hundred. Licence cost spread over its term, about three hundred. Maintenance and repairs, about two thousand five hundred. Insurance, about seven hundred. Void allowance at eight percent — that's about two thousand six hundred and forty. And a replacement reserve for furniture and safety kit, about eighteen hundred.

It is, yeah. [chuckles] Total costs come to about nineteen thousand two hundred and ninety. Which leaves around thirteen thousand seven hundred and ten before finance and tax. As a share of the two hundred and sixty thousand outlay, that's about five point three percent.

Exactly. And that's before we've even touched finance costs or tax. Does that make sense so far?

That's a good way to put it. And it gets more interesting when you stretch it out over ten years. On flat figures — so not adjusting for anything changing — the HMO produces about a hundred and thirty-seven thousand over ten years. The single-let produces about eighty-seven thousand seven hundred. So a difference of roughly forty-nine thousand four hundred.

It does! Until you remember the HMO needed about sixty thousand more capital. If that extra money is borrowed at around five percent, it costs about three thousand a year in interest — so thirty thousand over the decade. The cashflow gap falls to about nineteen thousand four hundred before tax. Which is roughly... nineteen hundred a year.

Yeah. And that's the central, optimistic case. One bad year — a licensing breach, a major refit, several rooms empty at once — can easily wipe out ten thousand pounds or more. The margin for error is thinner than the gross yield suggests.

It's meant to be a reality check, not a reason to never do an HMO. But yeah — the point is, hold a cash buffer before you buy, not after. Because after is too late.

Yeah, so Priya is a higher-rate taxpayer, she was weighing up a two hundred and seventy-five thousand pound HMO conversion against a two hundred and ten thousand pound single-let near a commuter rail line. Her first spreadsheet showed the HMO bringing in three thousand six hundred a year more in net rent.

It does. But once she added interest on the extra borrowing, a realistic replacement reserve, and factored in her tax position — the premium fell to about fourteen hundred a year. And she would also have been self-managing five tenancies.