A landlord in Slough rents out five rooms in a converted semi. He's held a standard buy-to-let insurance policy for six years, the same one he took out on a single-let flat before he ever heard the term HMO. Then a chip pan fire in the shared kitchen spreads to the stairwell, damages three rooms and the communal hallway, and his insurer refuses the claim outright. The policy wording excluded "houses in multiple occupation with more than two unrelated households" — a clause he'd never read because nothing had ever gone wrong before.
That story isn't rare. It's the single most common reason landlord insurance claims on HMOs get declined, and it has nothing to do with fraud or bad luck. It's a mismatch between the property being insured and the property actually being run.
Why standard landlord policies stop covering HMOs
Most buy-to-let insurance is priced and underwritten around a single household renting a whole property on an assured shorthold tenancy. Insurers build their risk models on that assumption: one kitchen used by one family, one set of keys, occupancy turnover measured in years rather than months. An HMO breaks every one of those assumptions at once. A licensed HMO under the Housing Act 2004 — mandatory nationally where five or more people from two or more households share a kitchen, bathroom or toilet — means multiple strangers sharing communal wiring, communal cooking appliances and communal fire escape routes, often with tenants moving in and out every few months. Underwriters price single lets on the basis that the same people cook, wash and sleep in the property for a year or more at a stretch, and that assumption simply doesn't hold once four or five separate tenancies with four or five separate move-in dates are running through the same front door. Add students or young professionals sharing bills and a kitchen for the first time, and the wear on flooring, appliances and communal furniture climbs faster than any single-family policy was ever priced to absorb. None of that makes an HMO a bad investment — plenty of landlords run them profitably for years without a claim — but it does mean the insurance has to be bought for the property that actually exists, not the one on the mortgage paperwork from five years ago.
Insurers respond to that higher exposure in one of two ways: they either exclude HMO use entirely from a standard policy (the default position for most mainstream buy-to-let products) or they cap cover in ways that only surface at claim time — public liability limited to £1 million rather than the £2–5 million a specialist HMO insurer would offer, or accidental damage cover that quietly excludes "communal areas" from the definition of the insured property. Read the policy schedule, not just the summary: the word to look for is "occupancy," and if it says "single family" or "one household" anywhere, a licensed HMO does not fit inside it.
What the Regulatory Reform (Fire Safety) Order actually requires
Every licensed HMO in England and Wales falls under the Regulatory Reform (Fire Safety) Order 2005, which puts a legal duty on the "responsible person" — almost always the landlord — to carry out a fire risk assessment covering communal escape routes, fire doors, smoke alarms and emergency lighting. Local authorities enforce this alongside HMO licensing conditions, and a growing number of specialist insurers now ask for a copy of the fire risk assessment before they'll even quote, not after a claim.
This is the part that catches landlords out. A fire risk assessment isn't a form you fill in once — it needs revisiting whenever the property's occupancy or layout changes, and an insurer who discovers at claim stage that the assessment is three years out of date, or was never done at all, has solid grounds to reduce or refuse a payout under the policy's "reasonable precautions" condition. Get the assessment done by a competent person (many local authorities publish an approved-contractor list on request), keep the dated report with your policy documents, and renew it whenever a room changes use or a new fire door goes in.
Licensing, the Renters' Rights Act and why insurers are asking more questions
Mandatory licensing under the Housing Act 2004 only covers larger HMOs — five-plus occupants across two-plus households. Below that threshold, many councils run their own selective or additional licensing schemes covering smaller shared houses in specific wards; Liverpool, Newham, Croydon and several other boroughs and cities have run these for years, and the list of covered postcodes changes as councils renew their schemes on five-year cycles. An unlicensed HMO where a licence was legally required isn't just a fine risk from the local authority — it can void the buildings and contents cover entirely, because most HMO policies now write licence compliance into the underwriting terms as a condition precedent to cover, not a footnote. Not every shared house needs the same treatment, though. A landlord letting three rooms to sharers who moved in together and hold one joint tenancy is running a genuinely different risk from a five-room bedsit conversion with a constantly changing tenant list and five separate agreements, even though both get called "HMO" in everyday conversation. Insurers who quote both at an identical HMO loading are pricing the wrong risk in one direction or the other, and it's worth querying a quote that doesn't distinguish between the two — a broker who specialises in the sector usually will, without being asked twice.
Since the Renters' Rights Act's provisions started reshaping tenancy structures across the private rented sector this year, insurers covering HMOs have been asking sharper questions at renewal about how rooms are actually let. A single joint tenancy across the whole house behaves, for insurance purposes, much closer to a standard let — one tenancy, one notice period, one point of contact. Room-by-room individual tenancies are a different risk entirely: turnover is higher, void periods overlap unpredictably between rooms, and rent guarantee insurance priced for a single-tenancy let simply doesn't map onto five separate tenancy agreements with five separate risk profiles. If your HMO runs individual room tenancies, say so explicitly on the proposal form — insurers who find out afterwards that the structure wasn't what they quoted for can treat it as non-disclosure.
What the premium difference actually buys
That premium isn't padding.
Specialist HMO landlord insurance typically runs 20–40% above an equivalent single-let policy on the same bricks and mortar, and landlords who've only ever insured standard lets are often surprised by the jump. It reflects genuinely higher claims frequency — the Association of British Insurers doesn't break out HMO-specific loss ratios publicly, but underwriters who specialise in the sector consistently cite escape-of-water claims from shared kitchens and bathrooms, and accidental damage in communal areas, as running well above single-let averages, simply because more people are using the same fixtures more often.
What that higher premium buys, when the policy is written properly for HMO use, includes: public liability cover sized for multiple unrelated occupants rather than one family; buildings cover that explicitly includes communal furniture, fire doors and alarm systems specified as licence conditions, not just the structure itself; loss-of-rent cover structured around partial voids (one room empty, four occupied) rather than an all-or-nothing calculation; and, from most specialist insurers, unoccupied-property cover that doesn't lapse the moment a single room sits empty between tenants — a near-constant state for larger HMOs and one that would trigger an unoccupied-property exclusion on most standard policies within 30 to 60 days.
Checklist before your next renewal
- Confirm the policy schedule explicitly states "HMO" or "multiple occupation" — not just "buy-to-let" or "let to tenants"
- Check the public liability limit against the number of occupants, not just the property value
- A fire risk assessment needs to be current and dated, not just filed away from when the HMO licence was first granted
- Confirm your licence — mandatory or selective, whichever applies in your council area — is current and the reference number matches what's on the insurance proposal
- Tell the insurer exactly how rooms are let: single joint tenancy or individual room-by-room agreements, because this changes the rent guarantee and void calculations
- Ask whether communal areas and shared-use appliances sit inside the buildings sum insured, and to what limit — plus anything else specific to your council's licensing conditions
None of this is exotic underwriting. It's the same information an experienced HMO insurer asks for every single time, because they've priced the claims that come from not asking.
The case for switching away from a generalist insurer
If your current policy was arranged before the property became an HMO, or by a broker who deals mostly in standard buy-to-let, get a specialist quote before this year's renewal rather than after a claim forces the issue. Insurers such as those operating through the specialist HMO schemes at Alan Boswell Group, Just Landlords or Total Landlord Insurance price this risk every day and ask the licence, fire-assessment and tenancy-structure questions upfront — a generalist insurer often doesn't ask at all, which feels cheaper right up until the point where it isn't. A £150–£300 annual premium difference is a poor trade against a declined claim on a five-figure fire or escape-of-water loss, and that arithmetic doesn't need a broker to explain it twice.
Landlords who've run a smooth single-let for a decade sometimes treat the HMO conversion as a paperwork exercise for the council and nothing else. The insurance side of that conversion deserves the same attention as the licence application — arguably more, because the licence gets checked once by the council and the insurance gets checked by the insurer only when something has already gone wrong.