Underinsurance: The Clause That Reduces Every Claim
Most policyholders assume that insuring for less than full value simply caps what they can recover. In many policies it does considerably more than that, through a provision commonly called average.
Where it applies, the insurer reduces a claim by the same proportion that the property is underinsured — even on a small partial loss that is nowhere near the sum insured.
How the reduction works
Suppose contents are insured for 30,000 and the true replacement value is 60,000. The property is insured for half its value.
A 6,000 claim for water damage is not paid at 6,000. Under an average clause it is reduced by the same proportion — halved, to 3,000, before the excess is deducted.
The loss was well within the sum insured, and the policyholder still receives half. That is the part people do not anticipate.
Why so many households are underinsured
Building rebuild costs rose sharply through the early 2020s as materials and skilled labour became more expensive. Sums insured set before that period frequently no longer reflect what rebuilding costs.
Rebuild cost is also not market value, and people routinely confuse the two. It is the cost of demolition, clearance, professional fees and construction to current building standards — which in some cases exceeds market value and in others is well below it.
Contents accumulate quietly. Most people substantially underestimate what replacing everything would cost, because they value possessions at what they paid rather than at today's prices.
Establishing the right figure
For buildings, use a rebuild calculator from a recognised body rather than guessing, or commission a professional assessment for unusual or listed properties.
For contents, work room by room and price replacements at current retail. The total is almost always higher than the estimate people give off the top of their head.
Include what sits in lofts, garages and sheds, which is routinely omitted.
Business policies are worse
Commercial property and stock policies frequently apply average, and business interruption cover is particularly exposed.
Business interruption sums insured depend on getting both the gross profit figure and the indemnity period right. An indemnity period that is too short is a common and expensive error, because rebuilding and recovering trade routinely takes longer than owners expect.
What to do about it
Check the declarations page for the sums insured and compare them against a current rebuild calculation and a fresh contents assessment.
Look for index linking, which adjusts the sum insured annually. It helps and is not a substitute for periodic review, since it tracks a general index rather than your specific circumstances.
Some policies offer to waive average where the sum insured was set using the insurer's own assessment. That is worth having.
Review after any extension, loft conversion, major purchase or inheritance. Those are the moments when the gap opens, and the claim that reveals it usually arrives later.
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