A construction loss does not stop by itself. A collapsing excavation goes on collapsing, water ingress goes on seeping, an extinguished fire leaves a structure that may give way on the repair crews. Somebody must act within hours, incur expense, hire equipment, bring firms in on an emergency basis, and must do so before any insurer has said anything. The question of who pays for that has an answer in French law that often surprises, because it does not follow the logic of contractual limits.
Expenses incurred to prevent or mitigate the consequences of a covered loss are borne by the insurer, and they are so even beyond the sum insured. That is a rule of mandatory law in property insurance, and it is understood through its purpose: an insured hesitating to spend because it has reached its limit would let the loss worsen, which would cost everyone more. The rule removes that hesitation by guaranteeing that useful expenditure will be reimbursed whatever happens. On a construction site, where worsening is fast and action urgent, it is one of the few provisions from which the insured draws a net advantage and which it most often does not know about.
What falls into that category must still be known, because it is narrower than its name suggests. Three conditions stack. The expense must aim to prevent an imminent loss or mitigate its consequences, which excludes the repair itself: propping a threatening wall is a mitigation cost, rebuilding it is damage. It must be incurred in the insurer's interest, that is, bear on a risk covered by it. And it must be reasonable, which does not require it to have succeeded: a measure taken in good faith and proportionate remains reimbursable even if the loss happens anyway, and that is the point insureds do not dare invoke.
The boundary with repair is where files get complicated, because on a site the two are often done in one movement. A crew working on an unstable slope installs temporary anchors, then replaces them with permanent support, sometimes in the same week and with the same equipment. The first expense is mitigation, the second repair, and the invoice does not distinguish them. The practical consequence is that this separation must be asked for at the time the work is done, in the order placed with the firm, and not at settlement where nobody will be able to say which truck served what.
A neighboring confusion deserves clearing up, the one with increased cost of working or expediting expenses. Accelerating a project to claw back a delay caused by a loss is not mitigation: the damage has stopped, one is repairing its economic consequences, and those expenses come under a cover of their own, capped, where it exists. The difference lies in the direction of time: mitigation stops the damage from growing, acceleration repairs what it has already cost. That test is simple and it settles almost every doubtful case.
What the rule does not say must also be seen, or too much is read into it. It operates only if the loss comes under a cover of the contract: a protective measure taken against an excluded peril is not reimbursed, however urgent. It does not dispense with notification obligations nor with the preservation clause seen in the module on proof, and those two requirements can pull against fast action: whoever clears to make safe also destroys evidence. Good practice then lies in a single free act, photographing before acting, which satisfies both obligations at once.
That leaves the symmetrical obligation, which falls on the insured and is sometimes presented as a favor when it is a duty. The insured must take reasonable steps to limit the damage; failing to do so can be held against it, and avoidable worsening left with it. On a stopped site, described two modules earlier, that obligation meets a brutal reality: there are no crews left, no budget, and sometimes no legal entity left to decide. That is precisely where the rule on exceeding the sum insured takes on its value, since it allows expenditure to be committed without first having to check what limit remains.
A flood damages a civil engineering structure on October 4. The policy, with a 25 million euro limit, covers flood. Direct damage is assessed at 24.1 million. Within seventy-two hours the project owner commits: 1.4 million of pumping and temporary cofferdams to stop a second wave reaching the still sound part; 900,000 euros of temporary anchors on a slope threatening to collapse onto the repair area, replaced three weeks later by permanent support costing 2.2 million ordered from the same firm on the same invoice; and 3.1 million of night and weekend work to claw back the delay. The second wave occurs anyway and causes 600,000 euros more. What does the insurer owe, and from which envelope?
Classification must come before counting, and three classes suffice. Direct damage, 24.1 plus the 600,000 of the second wave, that is 24.7 million, is charged against the 25 million limit: it just fits. Mitigation costs come next, and that is where the rule operates: the pumping and cofferdams, 1.4 million, aimed to stop a covered loss from worsening, and they are owed beyond the sum insured. That the second wave happened anyway does not deprive them of that classification, and that is the point insureds do not dare invoke: the measure had to be reasonable, not victorious. The temporary anchors, 900,000, fall in the same class; the 2.2 million permanent support does not, it is a repair, and the fact that it appears on the same invoice as the anchors is exactly the trap the purchase order should have prevented. The 3.1 million of night work is not mitigation either: the damage had stopped, its economic consequences were being clawed back, and that comes under a cover of its own, capped, where it exists. The non-obvious point is arithmetical: without the rule on exceeding the sum insured, the 2.3 million of mitigation would have been charged against a limit already consumed to 24.7 and would have yielded nothing. With it, it is owed in full. A rule nobody negotiated is worth more here than the last slice of the limit everybody negotiated.
- 01Expenses incurred to prevent or mitigate a covered loss are owed BEYOND the sum insured: that is mandatory law, and on a consumed limit it is worth more than the last slice everybody negotiated.
- 02Three conditions stack: aiming to prevent or mitigate, bearing on a covered risk, and being reasonable. The measure had to be reasonable, not victorious: mitigation that fails remains reimbursable.
- 03Propping is mitigation, rebuilding is repair: on a site both are done in one movement, and the separation is asked for in the PURCHASE ORDER, not at settlement.
- 04Acceleration is not mitigation: mitigation stops the damage from growing, acceleration repairs what it has already cost. The direction of time settles almost every doubtful case.
- 05The insured has the symmetrical duty to limit the damage, and avoidable worsening stays with it: on a stopped site, with no crews or budget, that is where the rule on exceeding the sum insured takes on its value.