Portfolio insurance mistakes that cost UK landlords at claim time

Most portfolio landlords do not find out their insurance is wrong until they claim. The premium looked fine. The certificate looked fine. Then a flat floods, the loss adjuster does the maths, and the payout comes back thousands short.

The point is blunt: the expensive mistakes in landlord insurance are almost never about price. They are about how the policy was set up and what the insurer was, or was not, told. Comparing quotes is the easy part. The cover sitting behind the quote is where portfolios get hurt. These are the six that come up most often.

The short version

• Portfolio insurance problems usually surface at claim time, not at purchase, and they come from how cover is set up rather than the premium paid.
• Insure buildings for their rebuild cost, not market value. Most UK policies carry an "average" clause that cuts payouts in proportion to any underinsurance.
• Buy-to-let landlord insurance is business insurance, so the Insurance Act 2015 duty of fair presentation requires you to disclose every material fact you know or ought to know.
• Most policies limit cover on a property left empty beyond a set period, which varies by insurer, so tell the insurer before it stands vacant.
• Loss of rent, rent guarantee and property owners' liability are often optional extras, not automatic, and the policy needs reviewing whenever the portfolio changes.

1. Running a portfolio on a stack of separate single-property policies

Once you own more than two or three properties, insuring each one on its own policy usually costs you more and quietly creates gaps.

You end up with different renewal dates, different insurers, and different terms. One policy lapses because the reminder went to an old email. Nobody has a single view of what is actually covered. And the combined premium is often higher than one portfolio policy covering the lot.

A portfolio policy puts every property on one schedule and one renewal date. Past a handful of properties, that is usually the right move, not just the tidy one.

2. Insuring for market value instead of rebuild cost

Buildings insurance should be based on what it costs to rebuild the property, not what it would sell for.

These are different numbers, and landlords get caught both ways. In some areas rebuild cost sits below market value, so you over-insure and overpay every year. In others, especially flats and older or period buildings, rebuild cost is higher than people assume, so you under-insure without realising it.

Under-insurance is the dangerous one, because most buildings policies contain an "average" clause, sometimes called the condition of average. If you insure for 70 percent of the true rebuild cost, the insurer can cut your payout by roughly the same proportion, even on a small claim. Insure for half, get paid half. Insurers are auditing sums insured more closely now, not less. Get the rebuild figure from the lease, a surveyor, or a proper rebuild calculator. Do not guess it.

3. Treating disclosure as optional

Landlord insurance is business insurance, and the legal bar for what you must tell the insurer is higher than on an ordinary home policy.

Because letting property is a business, a buy-to-let policy is treated as a non-consumer contract, so the Insurance Act 2015 applies rather than the consumer rules. That means you owe a duty of fair presentation of the risk. In plain terms, you have to disclose every material circumstance you know or ought to know about, clearly enough for the insurer to take it in. That includes things landlords routinely leave off: the tenant type, such as housing benefit, students, company lets or asylum housing, plus previous claims, unusual construction, a commercial unit on the ground floor, or an unspent CCJ.

If you get this wrong, the insurer's remedies are serious. They can reduce the payout, apply the terms they would have set had they known, or, where the failure was deliberate or reckless, void the policy and keep the premium. The safe instinct is simple: assume the insurer wants to know, and tell them.

4. Not telling the insurer when a property sits empty

An empty property is a different risk, and most policies restrict or suspend key cover once a property has been unoccupied beyond a set period.

That period varies by insurer, so check your own wording rather than assume. Cover for things like escape of water, theft, and malicious damage is usually the first to fall away. Properties sit empty more often than landlords admit: between tenancies, during a refurbishment, during a sale.

This is about to catch more landlords out. The government has proposed lifting the minimum energy rating for privately rented homes to EPC C, with a target around 2030, though that is still under consultation rather than settled law. If it lands, a lot of portfolios face energy works over the next few years, and works often mean weeks of vacancy. When a property is going to be empty, tell the insurer and arrange unoccupied cover before it stands empty, not after the pipe bursts.

5. Assuming the headline policy already includes loss of rent and liability

Loss of rent, rent guarantee, and property owners' liability are frequently separate options, not things that come built in.

People also confuse two different covers. Loss of rent pays out when an insured event, like a fire or flood, makes the property uninhabitable and the rent stops. Rent guarantee covers you when the tenant simply stops paying. They are not the same product, and one does not stand in for the other. Property owners' liability is the cover that protects you if a tenant or visitor is injured and blames the building. Read the schedule and confirm which of these you are actually buying.

6. Setting it up once and letting it auto-renew

A portfolio changes constantly, and a policy bought two years ago probably no longer matches the portfolio you own today.

You added a property mid-term. You turned a single let into an HMO. You started taking short-lets. You had building work done, or changed the type of tenant you house. Every one of those is a material change the insurer should know about. Auto-renewing without re-checking rebuild figures and cover levels is exactly how the gaps open up, slowly, until a claim finds them.

Review the cover properly at renewal, and update it the moment something changes mid-term. If you are pricing portfolio cover from scratch, our guide to the best portfolio insurance for UK landlords is the place to start.

Common questions

Do UK landlords need a separate portfolio insurance policy?

Not by law, but once you own more than two or three rental properties, a portfolio policy that covers them all on one schedule and one renewal date is usually cheaper and less risky than a separate policy for each property. Separate policies create mismatched renewal dates and gaps in cover that are easy to miss.

Should landlord buildings insurance be based on rebuild cost or market value?

It should be based on the rebuild cost, meaning the cost to reconstruct the property, not its market or purchase price. If you insure for less than the true rebuild cost, most UK policies apply an "average" clause and reduce any payout in proportion, so a property insured for 70 percent of its rebuild cost can have a claim cut by around 70 percent.

What must a UK landlord disclose to their insurer?

Because buy-to-let landlord insurance is treated as business insurance, the Insurance Act 2015 requires a fair presentation of the risk. The landlord must disclose every material circumstance they know or ought to know, such as tenant type, previous claims, unusual construction or commercial use. Failing to do so can allow the insurer to reduce a payout or void the policy.

Does landlord insurance cover an empty property?

Usually only for a limited time. Most policies restrict or suspend key cover, such as escape of water, theft and malicious damage, once a property has been unoccupied beyond a set period that varies by insurer. If a property will be empty between tenancies or during works, tell the insurer and arrange unoccupied property cover.

The bottom line

Portfolio insurance is not a product you buy once at the lowest price and forget. It is a position you keep accurate. The cheapest policy that pays out 60 percent of your loss is the most expensive policy you own.

If you want the detailed, step-by-step version, including how to compare portfolio policies properly, what a sound rebuild figure looks like, and which cover lines are worth paying for, read our full guide to the best portfolio insurance for UK landlords. This post is the why. The guide is the how.

This is general information about how landlord insurance works in the UK, not regulated financial or insurance advice. Policy wordings differ, so check yours and confirm current rules before acting.