Average clause in fire insurance: why a business claim gets cut — and how to avoid it

A fire policy is a contract of indemnity — built to put you back where you were, not to pay out more than you lost. The catch sits in the small print most businesses never read until a claim: the amount you can recover is anchored to the value you declared, not the value you actually own. Declare too little, and the policy shares the loss with you. That sharing is the average clause. If you're weighing cover for your premises more broadly, the fuller picture sits in our guide to fire insurance for business.

What the average clause is

The average clause is a standard condition in a fire insurance policy. If your sum insured is less than your property's full value, it cuts a partial-loss claim by the same proportion. Insure 70% of the value and a claim is paid at roughly 70% — the shortfall is yours to carry.

It is also called the condition of average or the under-insurance clause — different names for the same proportionate-settlement mechanism. The table shows how it bites as under-insurance deepens.

Applies to partial losses. A total loss is paid up to the sum insured, so under-insurance still caps the payout. The "full value" the clause measures against depends on whether your cover is on a reinstatement-value or market-value basis — how to set the right sum insured.

How the proportion is worked out

The maths is one line: the claim is paid in the same ratio as your sum insured bears to the property's full value. Insure 60% of what the asset is really worth, and a partial loss is met at about 60% — regardless of how small the damage is.

It matters that this is a proportion, not a deductible. A modest fire that damages a fraction of a heavily under-insured factory is still scaled down by the full under-insurance percentage. The clause does not care that the loss was small; it cares that the declaration was short.

Why so many businesses are under-insured without knowing

Almost no one under-insures on purpose. It happens quietly: a sum insured set years ago on the original purchase price, an asset base that has grown since, construction and machinery costs that have risen with inflation, and the common confusion between what an asset is worth today and what it would cost to rebuild.

In the claims we take on, the single most common reason a partial fire claim comes back reduced is not an exclusion or a dispute — it is a sum insured that was never updated after the business grew. Industry estimates put a large share of Indian commercial property under-insured by as much as 30–50%.

Put plainly: under-insurance never shows up on your premium receipt — it shows up on your claim cheque, on the worst possible day to learn the difference. The fix is not to over-insure; it is to insure for the right number, on the right basis, and to keep that number current.

Does it apply to a total loss?

A total loss is settled up to the sum insured — so under-insurance still bites, just differently. You cannot recover more than you declared, even if the property was worth far more.

Where the average clause does its sharpest work is the partial loss, which is the far more common event: a fire that takes part of a building or a line of machinery, scaled down by the under-insurance percentage. It is also the point where a fire claim most often stalls at settlement.

How to keep your sum insured right

Three habits keep the clause from ever applying: set the sum insured on the basis that funds recovery (usually reinstatement value for a working building or plant), review it at least once a year and whenever assets or prices move, and consider an escalation clause so cover tracks rising costs through the year.

Those are mechanics any business can hold a broker to, and they sit at the heart of how a business sets its fire cover. Getting the number itself right is the subject of a companion piece: setting the right sum insured, reinstatement versus market value.