insurance

Home Insurance Explained: What's Actually Covered (UK 2026)

Home insurance premiums have been falling, but rebuild costs keep climbing — and that gap is where underinsurance hides. Here's what every section of a UK home insurance policy actually means, which exclusions catch people out, and how the "average clause" can quietly cut your payout.

The Clarify Team

— 7 min read
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Heads up: Average combined buildings and contents premiums fell to around £375 in early 2026 — but the ABI/BCIS rebuilding cost index rose 5.9% over the same year. Cheaper cover plus pricier rebuilds is exactly how households end up underinsured without noticing.At a glance

  • Buildings cover pays to rebuild the structure. Contents cover pays to replace your things. They are separate — and you can be short on one while fine on the other.
  • Your buildings sum insured should be the rebuild cost, not the market value. These are very different numbers.
  • Most policies contain an "average" clause: insure a £400,000 rebuild for £300,000 and a claim can be cut by roughly a quarter — even a small one.
  • Estimates suggest around 70% of UK properties are underinsured, mostly because sums insured were set years ago and never revisited.
  • The most common claim refusals come from exclusions and conditions — gradual damage, unoccupancy, poor maintenance, and undeclared changes — not from insurers being difficult.
  • Not financial advice: This article explains the rules in plain English. For your specific situation, speak to a regulated insurance broker or Citizens Advice.

Home insurance is one of the few documents that arrives every single year, gets skimmed for the price, and then goes straight in a drawer. That's understandable. A typical policy booklet runs to 40 or 50 pages of defined terms.

But the day you actually need it — a burst pipe, a stolen laptop, a storm-damaged roof — is the worst possible time to discover what you agreed to. By then the wording is fixed, and the questions you'll be asked have answers you set months ago.

The good news: you don't need to read all 50 pages. Five sections carry almost all the risk. Here's what they say.

Buildings and contents are two different policies

Even when you buy them together as a "combined" policy, they're separate cover with separate limits and separate rules.

Buildings cover

This covers the structure: walls, roof, floors, and permanent fixtures. The test most insurers use is whether you'd leave it behind if you moved. Fitted kitchens, bathrooms, and built-in wardrobes are usually buildings. Outbuildings, garages, driveways, walls, and fences are often included but frequently capped at a lower limit.

If you own a leasehold flat, the freeholder usually insures the building through the service charge. You generally only need contents cover — but check your lease rather than assuming.

Contents cover

This covers what you'd take with you: furniture, clothes, electronics, appliances that aren't built in. Carpets usually count as contents in the UK, which surprises people.

Two limits matter more than the headline number:

  • Single item limit — often £1,500 or £2,000. Anything worth more than this needs to be listed individually, or it won't be covered for its full value.
  • Valuables limit — a combined cap on jewellery, watches, art, and collectibles, often set as a percentage of your total contents sum.

Rebuild cost is not market value

This is the single most common and most expensive mistake in UK home insurance.

Your buildings sum insured should be the cost to demolish and rebuild your home from scratch — materials, labour, scaffolding, architect and surveyor fees, debris removal, and meeting current building regulations. It has nothing to do with what your house would sell for.

In many parts of the country the rebuild cost is well below market value, because you're not paying for the land. In others — older properties, listed buildings, unusual construction — it's higher. Either way, guessing is how people end up short.

The Building Cost Information Service runs a free rebuild calculator, and most insurers link to it. It takes about ten minutes.

Why this got worse recently

Rebuild costs have risen faster than premiums. The ABI/BCIS House Rebuilding Cost Index was up 5.9% in the year to the first quarter of 2026, driven by material costs and labour. Meanwhile average premiums have been drifting down.

If your sum insured hasn't moved since you set it, the gap between what your policy says and what a rebuild actually costs has been widening quietly every year.

The "average" clause — the one that catches people out

Buried in the conditions of most policies is a clause saying that if you're underinsured, the insurer can reduce your payout in proportion to the shortfall.

Here's what that means in practice. Say your real rebuild cost is £400,000, but you insured for £300,000. You're covered for 75% of what you should be. A £20,000 water damage claim doesn't get paid in full — it gets cut to roughly £15,000, because you'd effectively been paying 75% of the correct premium.

The trap is that this applies to every claim, not just total losses. Most people assume being underinsured only matters if the house burns down. It doesn't.

Not sure what your policy actually says?

Upload your policy booklet or schedule to Clarify and ask in plain English — "am I covered for accidental damage?", "what's my single item limit?", "does this have an average clause?". You get an answer with the exact section of your document cited, so you can check it yourself in seconds instead of scrolling through 50 pages.

Try Clarify free → getclarify.co.uk

The exclusions that cause most refused claims

Claims rarely get turned down because an insurer is being awkward. They get turned down because of a handful of standard exclusions that most people have never read.

Gradual damage and wear and tear

Insurance covers sudden, unexpected events. It does not cover things that happened slowly. A pipe that bursts overnight is covered. A pipe that's been weeping behind a wall for two years, rotting the joists, usually isn't. The same logic applies to damp, rot, rust, and general deterioration.

Poor maintenance

Related, but distinct. If a storm removes tiles from a roof that was already in poor condition, the insurer may argue the roof — not the storm — was the real cause. Keeping receipts for maintenance work genuinely helps here.

Unoccupancy

Nearly every policy limits how long the property can be empty — commonly 30 to 60 consecutive days. Go beyond it without telling your insurer and cover for escape of water, theft, and malicious damage often falls away entirely. This catches people who go travelling, work abroad, or inherit a property.

Accidental damage (often optional)

Putting a foot through the loft ceiling, spilling wine on the sofa, drilling into a pipe. Standard policies frequently exclude this. It's usually an add-on — check whether you actually bought it.

Escape of water conditions

Some policies require you to keep the heating on at a minimum temperature during winter months, or drain the system if the property is empty. Fail to do it and a burst-pipe claim can be declined.

Business use and home working

Standard contents cover often excludes business equipment and won't cover clients visiting your home. If you're self-employed and working from your spare room, check this — the fix is usually cheap.

What to actually do this week

  1. Find your schedule — the two-page summary, not the booklet. Every number that matters is on it.
  2. Check your buildings sum insured against a rebuild calculator. If it's more than a couple of years old, it's probably low.
  3. Do a rough contents count, room by room. Most people underestimate by a wide margin — everything you own, at replacement cost, is a bigger number than it feels.
  4. List anything over your single item limit and tell your insurer. Jewellery, bikes, laptops, musical instruments.
  5. Tell your insurer about changes — an extension, a loft conversion, a lodger, a new business. Undeclared changes are a common reason for refused claims.
  6. Photograph each room and store the images somewhere off-site. Proving what you owned is half of any contents claim.

If you need to claim

Report it quickly — most policies have a notification deadline. Take photographs before you clear up. Keep damaged items until the insurer says otherwise. Do only the emergency work needed to prevent things getting worse, and keep every receipt.

If a claim is declined and you disagree, you can complain to the insurer first, then take it to the Financial Ombudsman Service free of charge. You have six months from the insurer's final response.

Comparing two policies at renewal?

Upload both and ask Clarify what's different — excess amounts, single item limits, whether accidental damage is included, what the unoccupancy limit is. Every answer comes with a citation pointing to the exact clause, so the cheaper quote's hidden trade-offs show up before you buy, not after.

Compare your policies with Clarify → getclarify.co.uk

Frequently asked questions

No. There's no law requiring it. But almost every mortgage lender makes buildings insurance a condition of the loan, so in practice most homeowners must have it. Contents cover is always optional.

What's the difference between rebuild cost and market value?

Market value is what someone would pay for your house including the land. Rebuild cost is what it would take to construct it again from scratch, excluding land. Your buildings sum insured should be the rebuild cost.

Do I need buildings insurance for a leasehold flat?

Usually not — the freeholder normally insures the whole building and recovers the cost through your service charge. Check your lease to confirm, and consider contents cover plus any leaseholder-specific extras.

What is an excess and how does it work?

The excess is the amount you pay towards each claim. There's typically a compulsory excess set by the insurer and a voluntary one you choose. Raising the voluntary excess lowers your premium but costs you more when you claim. Some risks, like subsidence, carry a much higher excess of their own.

Am I covered if my home is empty for a few months?

Only up to the unoccupancy limit in your policy — often 30 to 60 consecutive days. Beyond that, key cover including theft and escape of water usually stops. Tell your insurer in advance; they can often arrange unoccupied property cover.

Does home insurance cover my belongings outside the house?

Only if you have personal possessions cover, which is normally an optional add-on. Standard contents cover applies inside the home. If you want your phone, laptop, or bike covered away from home, you need to add it.

Will making a claim increase my premium?

Usually yes, and it can affect quotes for around five years since insurers ask about claims history. For small claims close to your excess, it's worth working out whether claiming leaves you better off overall.

What happens if I accidentally gave the wrong information?

Under the Consumer Insurance (Disclosure and Representations) Act 2012, an honest mistake shouldn't void your policy — the insurer must treat it proportionately, for example by adjusting the payout. Deliberate or reckless misrepresentation is treated far more seriously. If you spot an error, correct it straight away.

Disclaimer: This article is general information only and is not legal or financial advice. Insurance policies vary considerably between providers, and the wording of your own policy is what applies to you. For guidance on your specific situation, speak to a regulated insurance broker, the Financial Ombudsman Service, or Citizens Advice.

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