Home Insurance: How Much Cover You Actually Need

Home insurance is one of the few purchases where being roughly right is expensive in both directions. Under-insure and a claim gets scaled back. Over-insure and you pay every month for cover that can never pay out. The fix is arithmetic, not a quote comparison.

Rebuild cost is not market value

The single most common error is insuring a home for what it would sell for. The two numbers are unrelated. Market value includes the land, the location and demand; rebuild cost is what it would take to clear the site and construct the building again at today's labour and materials prices. In expensive areas rebuild cost is often far below market value. In cheaper areas with high construction costs it can be higher.

Insurers pay to rebuild, so rebuild cost is the figure that governs your claim. Most markets have a free rebuild-cost calculator from an insurance body or surveying institute — use one, and re-run it every few years. Construction inflation has been sharp enough recently that policies set five years ago are frequently under-insured by a wide margin.

What under-insurance actually does to a claim

This is the part people are surprised by. If you insure for 60% of the rebuild cost, many policies do not simply cap the payout at your sum insured — an average clause lets the insurer reduce a partial claim in the same proportion. A £40,000 fire claim on a home insured at 60% of rebuild cost can be settled at around £24,000. The penalty applies to small claims, not just total losses, which is what makes it so costly.

Contents: replacement cost, room by room

Contents sums are usually guessed, and usually guessed low. The reliable method is dull but quick: walk through each room and note what it would cost to buy everything in it new today. Kitchens, wardrobes and anything electronic are where the total accelerates. Photograph rooms and keep receipts for anything substantial — documentation is what makes a contents claim straightforward.

Two details matter here. Single-item limits cap individual valuables, commonly at a low figure, so jewellery, bikes, instruments and cameras usually need specifying separately. And new-for-old versus indemnity changes the settlement completely: indemnity deducts wear and tear, so a five-year-old sofa pays out as a five-year-old sofa.

The liability figure nobody checks

Buildings and contents get all the attention, but the clause with the largest theoretical exposure is public liability — cover for injury to a visitor or damage you cause to someone else's property. Legal costs and damages in a serious injury claim dwarf the value of most homes. Check the limit; if it is low, raising it is typically inexpensive because the events are rare.

The exclusions that cause refused claims

1. Gradual damage and wear. A slow leak that rots a floor over years is maintenance, not an insured event. A pipe that bursts today is.
2. Unoccupancy. Most policies restrict cover after the home is empty for 30 to 60 consecutive days. Long trips and probate periods routinely breach this without anyone noticing.
3. Flood and subsidence. Frequently excluded, sub-limited, or carrying a separate and much larger excess. Check specifically rather than assuming.
4. Unforced entry. Theft claims where doors or windows were left unsecured are commonly refused.
5. Business use and lettings. Running a business from home, or letting a room, can void a standard residential policy.
6. Undeclared work. Structural alterations, a new roof, or a loft conversion usually must be declared.

Where premiums genuinely come down

Shopping the renewal every year is the largest lever, exactly as with motor cover — introductory pricing means loyalty is rarely rewarded. Beyond that: raise the voluntary excess only to an amount you could pay tomorrow; pay annually rather than monthly, since instalments are credit at a real interest rate; fit approved locks and alarms and tell the insurer; and buy buildings and contents from the same insurer, which is usually cheaper and avoids two insurers arguing about which policy covers a fitted kitchen.

Excess, and the trade-off people get backwards

The excess is the amount you pay before the insurer contributes. Raising it lowers the premium, and on rarely-claimed cover that is often good value. The mistake is raising it to a figure that would itself be a financial problem — at which point you have swapped a small certain cost for a large uncertain one, which is the opposite of what insurance is for.

Watch for separate excesses on specific perils. Escape-of-water and subsidence claims frequently carry excesses several times the standard figure, and they are among the most common household claims. A policy advertising a low excess with a high water-damage excess is not the cheap policy it appears to be.

Add-ons: which earn their keep

1. Accidental damage. Often worth it, and frequently the clause that covers the realistic domestic accident — a foot through a ceiling, paint on a carpet, a cracked hob.
2. Home emergency cover. Convenient, but it is a call-out service rather than insurance. Compare against simply having a tradesperson you trust.
3. Legal expenses. Cheap, and useful for disputes with neighbours, contractors or employers. Read what it actually funds.
4. Away-from-home contents. Worth having if you carry a laptop, camera or bike. Check the limit rather than assuming it matches your in-home cover.

A twenty-minute annual review

Re-run the rebuild calculator. Re-walk the contents estimate if you have bought anything significant. Confirm any renovations are declared. Check the single-item limit still covers your most valuable possession. Then get three like-for-like quotes — identical excess, identical add-ons — because a comparison between different cover levels tells you nothing.

One reframe that helps: home insurance is not there for the £400 problem. It is there for the fire, the flood and the liability claim. Buy the sums insured right for those, take the excess you can genuinely afford, and stop paying for small conveniences bundled around the edges.

This is general information, not professional advice. Costs, cover, rates and rules vary by provider and location and change over time. Confirm current details directly with providers before deciding.