Your home insurance may look adequate until you claim. Here is how underinsurance cuts payouts, why a small loss can expose a big shortfall, and what to check.
You renew the home insurance, glance at the price and get on with your day. The house is covered. What else is there to think about?
Quite a lot, unfortunately. If you have insured your home or belongings for less than they would cost to replace, a claim for modest damage can leave you paying far more than the excess. The awkward conversation usually happens after the leak, not before it.
Yes, potentially. Some home policies contain an ‘average clause’. If you have insured something for only half its full replacement value, the insurer may seek to pay only half of a covered claim. This can apply to a partial loss, not just a fire that destroys the whole house.
Take a hypothetical example: rebuilding your home would cost £400,000, but the buildings sum insured is £200,000. A covered repair costs £20,000. If the insurer is entitled to apply an average clause, its share could be £10,000 before any excess. You would have to find the other £10,000, plus any excess that applies. You were not asking for a new house; you were asking to repair one damaged part of it.
That outcome is not automatic. Not every policy has an average clause, and the Financial Ombudsman Service examines whether an insurer asked clear questions, explained the need for the full rebuild or replacement cost, and acted fairly. It says applying average will usually be unfair where the insurer did not ask for that full figure or there is no such clause in the policy.
That is no reason to leave an obviously low figure untouched. Answer the questions reasonably, keep a copy of your answers and query wording you do not understand. An insurer may also challenge a claim or the policy if the information it was given was materially wrong.
For buildings insurance, the figure to investigate is the cost of rebuilding, not the estate agent’s asking price, what you paid or the mortgage balance. Rebuilding involves labour, materials, clearing the site and professional fees. A valuable plot does not necessarily make a house expensive to rebuild; an unusual building can cost more to rebuild than it would fetch on the market.
The Association of British Insurers points owners of standard brick-built homes towards a rebuilding-cost calculator or a chartered surveyor. For a listed home, non-standard construction or specialist features, an individual assessment may be more useful than an estimate based on a few boxes on a website. If your policy offers a high or unlimited buildings limit, check its conditions rather than assuming the figure settles every question about cover.
Review the estimate at renewal, particularly after an extension or major renovation, and tell the insurer about changes when they happen. Automatic increases to a policy limit are useful, but they cannot necessarily rescue a starting figure that was too low. Check whether garages and other outbuildings are included in what the insurer asked you to value.
A low premium is no bargain if the cover runs out before the repair bill does.
For contents, imagine replacing everything you own at today’s prices: sofas, beds, clothes, kitchen equipment, electronics and the belongings stored in the loft or garage. The exercise is not to estimate what you could get for it second-hand. Many policies work on a replacement-as-new basis, so an inventory room by room is more helpful than a hopeful guess made while filling in a quote form.
As a hypothetical illustration, £12,000 for furniture, £8,000 for electronics and appliances, and £10,000 for clothes and other belongings already totals £30,000. Those are example figures, not a typical household estimate. Add your own items instead, and revisit the total after substantial purchases or gifts.
Start with where your things are. Standard contents cover concerns belongings in the home; cover for possessions you carry outside it may need to be added. An expensive watch can also exceed a policy’s single-item limit even when the overall contents limit looks generous. Check both the limit for each item and any separate limit for valuables as a group. List an item separately if the insurer requires it.
Then look at what happened to the item. Theft and fire are different from accidentally dropping a laptop or losing a watch. Accidental damage and cover away from home may be optional, and policies differ. So do limits for things kept in sheds and garages. Keep receipts, photographs or valuations for expensive belongings where you can: an insurer may ask you to establish ownership and value.
Buildings insurance covers the structure and fixtures; contents insurance covers belongings. If you own your home, you may need both. If you rent, the landlord’s buildings policy is not a substitute for cover for your possessions. For a flat, find out how buildings cover is arranged before buying duplicate cover or assuming the block policy protects everything inside your front door.
Do not ignore the less glamorous lines in the documents. Your standard excess may differ from the excess for a water leak, flood or subsidence. Alternative accommodation has its own terms and limits. And if you leave the property empty for an extended period, you may have to tell your insurer and meet specific conditions. A long trip or a house left vacant during work is worth a call before you go.
Before renewal, ask for the policy schedule and read it alongside the full wording. Check the buildings and contents limits, single-item and valuables limits, cover away from home, excesses, exclusions and the information you previously gave. Update anything that has changed. If the wording is unclear, ask the insurer or broker to explain it and keep the answer in writing.
Compare like with like when shopping around. Since 1 January 2022, FCA rules have stopped firms setting a home insurance renewal price above the equivalent new-business price through the relevant channel. That does not mean every insurer offers the same price, or that the cheapest quote offers equivalent protection. None of these cover limits is set by the 2026/27 tax year: the policy you choose governs the claim.
The practical checks apply across England, Scotland, Wales and Northern Ireland. There is no single UK-wide rebuilding amount to enter on a form; it depends on your property. If a claim is reduced for underinsurance, ask the insurer to show its valuation, the policy term it relied on and its calculation. Send it any evidence that its estimate or its account of your original answers is wrong.
Complain to the insurer first if you think the decision is unfair. For most insurance complaints, it has eight weeks to respond before you can take the matter to the Financial Ombudsman Service; you can also go there sooner if you receive an unsatisfactory final response. Usually, you have six months from the date of that final response to refer the complaint. MoneyHelper can help you understand your cover, while a broker may help if your property or insurance needs are unusual.
Underinsuring your home can leave you paying part of a claim even when the damage is limited, although a reduced payout must be justified under the policy and treated fairly. Check the full rebuild cost, the replacement cost of your belongings and the limits and excesses that apply to particular claims. Correct a shortfall before you need to claim, not while the ceiling is dripping.
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