A property can be a perfect HMO on paper and still bleed voids if nobody wants to rent a room on that street. This scores the local lettings market — mostly desk research you can do before you even book a viewing: SpareRoom, a map, and a couple of letting-agent calls.
"Is there strong, durable demand for rooms here — at a rate that works?"
🔎 Research these from your desk
Search the postcode on SpareRoom — how many rooms are advertised, and how long they've sat there
What rooms actually rent for locally (all-inclusive), and whether rents are rising
What's nearby that creates demand — hospitals, universities, big employers, the city centre
Call two local letting agents — ask how fast HMO rooms let and the typical void
Open a map: transport links, supermarkets, the general feel of the street
Answers save automatically on this device, and your area and target carry forward to the rest of the toolkit.
You're sizing up an area here, not a specific property — that comes later, at the viewing. Define the market you're testing; this carries forward to the rest of the toolkit. None of it scores.
Area you're researching?The town, neighbourhood or postcode district you're assessing — e.g. "Southsea" or "PO4". Keep it tight enough that the demand, rents and competition are consistent across it; "Portsmouth" is usually too broad, a single district is about right.
Local council
Who are you renting to??Your primary tenant type shapes everything — where they need to be, what they'll pay, and how they choose a room. Students follow campuses; professionals follow employers and transport; key workers follow hospitals. "Mixed" is fine, but "not sure" is a red flag — you need a clear picture of who fills the rooms.
What do HMO-able properties cost here??Paste a few properties you've seen in the area that could work as an HMO — the sort of house you'd actually buy — with the asking (or sold) price for each. The checker averages them to give you a realistic acquisition cost for the area to take into your numbers. It doesn't score; it's there so you're not guessing the buy price.
Average purchase price—
2Planning climate—
These don't affect how well rooms let — they decide how hard, slow and risky it is to actually create an HMO here. A great market behind a planning wall is still a hard place to start. Check before you fall for the area; none of this scores, but it can be a dealbreaker.
Is there an Article 4 Direction here??An Article 4 Direction removes the automatic right to convert a house (C3) into a small HMO (C4) — so in an Article 4 area every new HMO needs full planning permission, which can be refused. Check on the council's website (search "[council] Article 4 HMO") or its planning policy map. This carries through to the Potential Checker.
Conservation / listed constraints in the area??In a conservation area (or with listed buildings), permitted-development rights for extensions, dormers, windows and cladding are restricted — so loft and rear-extension conversions cost more and need consent. Check the council's conservation-area map. You'll confirm the specific property in the Potential Checker.
While you're on the council's site, also note the HMO licensing scheme (mandatory/additional/selective) and any concentration policy (a cap on how many HMOs are allowed close together) — both shape your costs and your odds of consent. The Potential Checker tests these against a specific property.
ADemand drivers—
Why would anyone need a room here? Strong HMO areas sit near things that pull in renters who can't or won't commit to a whole property. Weight: 25%
What's within ~30 minutes? (tick all)?Room demand follows jobs and institutions. The more demand anchors nearby — and the more different types — the more resilient your lettings are. Relying on a single employer or one campus is a risk if it downsizes.
BLettings demand — the SpareRoom test—
The single best free signal of real demand: how the room market behaves right now. Weight: 25%
Rooms advertised nearby (SpareRoom, ~1 mile)?The SpareRoom test: search the postcode on SpareRoom and count live room ads within about a mile. Few ads with a waiting list = strong demand. Lots of ads, many sitting for weeks = oversupply or weak demand. Note the "advertised" dates to gauge how long they linger.
How quickly do rooms let around here??Ask local agents, or watch how fast SpareRoom ads disappear. Under a week means genuine pull; a month or more means you'll carry voids — and voids kill HMO returns faster than anything.
What do local letting agents say??Call two independent agents that manage HMOs. Ask: how's room demand, what's the typical void between tenants, and what rent do rooms achieve? Their answers are worth more than any portal.
CRent level—
Evidence the room rate from real comparables, then read the rent environment. Whether the deal itself stacks is for the Deal Analyser, once you have the average below. Weight: 18%
Comparable rooms — paste a few at the standard you'll create?Find rooms on SpareRoom or Rightmove that match the spec you're aiming for (ensuite, bills-included, similar area) and enter the advertised rent for each. The checker averages them — far more reliable than a single guess. Aim for at least three recent, genuinely comparable rooms.
Average room rate—
Rent trend locally?Are room rents rising, flat or softening? Rising rents give you a margin of safety; falling rents in an oversupplied area are a warning.
Do ensuite rooms command a premium here??On SpareRoom, compare ensuite room prices against shared-bathroom rooms in the same area. A clear premium means tenants here pay for quality — so the money you spend on ensuites comes back in rent. Little difference means a high spec won't lift your income much, so don't over-invest.
DCompetition & the quality bar—
Who are you up against, and is the market over- or under-supplied? Tired competition is an opportunity; a wall of high-spec rooms raises the bar. Weight: 16%
Standard of competing rooms?Scroll the SpareRoom photos. If most local rooms are tired and dated, a well-finished HMO with ensuites will let first and command a premium. If everything's already high-spec, you'll have to match it to compete.
Is the room market over- or under-supplied??Weigh the number of ads against how fast they let. Under-supplied (few ads, quick lets) is ideal. Over-supplied (lots of lingering ads) means price pressure and voids — and note this is different from the planning concentration test in the Potential Checker.
EConnectivity & amenities—
HMO tenants often don't drive. Easy transport and everyday amenities on the doorstep make rooms let faster and stay full. Weight: 16%
Walk to transport (station / key bus route)?Time on foot to a train station or a frequent bus route into the employment/study hubs. For car-free tenants this is often the deciding factor.
Everyday amenities nearby?Supermarket, shops, gym, takeaways, green space — the day-to-day stuff within walking distance. Convenience keeps rooms full and tenants longer.
Market Verdict
—/ 100
Score the five sections
Work through A–E. The scorecard weights each section, rolls them into a single market score, and tells you — with reasons — whether the demand is there.
Remember: a strong market score means rooms will let — it doesn't mean the deal stacks. Demand, rent and competition tell you the area works; only the full numbers (purchase, refurb, finance, running costs) tell you the investment works. Take your average room rate into the Deal Analyser to find out.
HMO BlueprintFast Track Toolkit
Market Viability Scorecard
Market assessment
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Score breakdown
The key facts
The detail
What to research before you commit
Run the SpareRoom test for the postcode — count live room ads and how long they've been listed.
Call two HMO letting agents — confirm room demand, typical voids and achievable rent.
Verify the achievable room rate against three comparable, recently-let rooms.
Map the demand anchors — make sure you're not reliant on a single employer or campus.
Check transport and amenities on foot, the way a car-free tenant would.
Take the average room rate into the Deal Analyser to test the actual return.
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