Choosing a business interruption indemnity period: why 12 months is usually too short

What the indemnity period actually is

Business interruption cover pays the shortfall in gross profit, plus increased costs of working, for losses within the indemnity period — a period that starts on the day of the damage and ends, at the latest, a fixed number of months later. When it expires, payment stops, whether or not the business has recovered. It is a cliff edge, and it is chosen at renewal, usually in about four seconds, usually by default.

The correct length is the answer to one question: how long until our trading returns to where it would have been if the loss had never happened? Not until the building is rebuilt. Not until the doors reopen. Until the revenue line rejoins its old path.

The realistic recovery timeline

Walk through a serious fire at a typical business premises and count the months honestly.

Phase one: before anyone builds anything

Insurers and loss adjusters investigate; the site is made safe and cleared; surveys are done; designs are drawn; planning permission is sought where the reinstatement needs it — and listed buildings, conservation areas and any change from the original footprint add months; the work is tendered; a contractor is booked into a diary that is rarely empty. It is common for a year to pass before reconstruction genuinely starts. Nothing about this phase is unusual or anyone’s fault. It is simply how reinstatement works.

Phase two: rebuild and refit

The build itself may be the most predictable phase, but it does not end at practical completion. Services must go back in; specialist plant and equipment must be reordered — sometimes on long manufacturer lead times — installed and commissioned; stock rebuilt; regulatory and certification sign-offs obtained. A business is not trading because the walls are up.

Phase three: winning the business back

This is the phase the 12-month default ignores completely. Customers found alternatives while you were closed, and the good ones were signed up by competitors who will not hand them back. Contracts lost mid-term come back, if at all, at the next tender round — which may be one or two years away. A seasonal business that misses its season waits a full cycle for the next one. Reputation, search rankings, foot traffic and habits all recover on their own timetables. For many businesses this phase is longer than the rebuild.

Matching the period to your business

A short, honest diagnostic: 12 months can be defensible for a business that could relocate within weeks, owns little specialist kit, and has customers who buy on availability rather than relationship. 24 months is the realistic floor for most established businesses with meaningful premises, plant or customer relationships. 36 months earns its keep wherever there are specialist or listed premises, planning complexity, long-lead-time machinery, a small number of dominant customers, seasonal trade, or a supply chain that would itself need rebuilding.

The right method is to run your own worst realistic loss month by month — clearance, permissions, rebuild, refit, win-back — and see where the trading line rejoins the projection. Then add a margin, because every one of those estimates was made on a calm day without a loss adjuster in the room.

The cost asymmetry

Extending the indemnity period is one of the cheaper improvements available in a commercial programme, because the later months carry a lower probability of still being in loss and the premium reflects that. Against it sits the alternative: a policy that stops paying at month twelve of a twenty-month recovery, withdrawing support at the point of maximum weakness. Underinsuring the indemnity period is a large risk run to save a small premium.

Keep the sum insured in step

A longer period only works if the insured figure covers it: a 24-month indemnity period needs gross profit projected across 24 months — roughly double the annual figure, plus growth — or a properly set declaration-linked arrangement. Lengthening the period without adjusting the figure simply moves the underinsurance from the calendar to the arithmetic. The two decisions belong together, alongside the choice of basis discussed in our companion page on gross profit versus gross revenue.

How Apex approaches it

We build the recovery story first — what would genuinely happen to this business after its worst realistic loss — and let the indemnity period, the sums and the extensions fall out of that story, rather than inheriting last year’s defaults. It is the part of BI broking that costs nothing and changes outcomes most.

Frequently asked questions

When does the indemnity period start and end?

It starts on the date of the insured damage and ends when the business ceases to be affected or when the maximum period expires, whichever is first. It does not restart at reopening, and payment stops at expiry even if recovery is incomplete.

Is a 12-month indemnity period ever enough?

Sometimes — for businesses that could relocate within weeks, hold little specialist equipment and sell on availability rather than relationship. For most established businesses with premises, plant or loyal customers, the realistic path from damage back to normal trading is longer than twelve months before customer win-back is even counted.

Does a longer indemnity period mean a much higher premium?

The premium base rises because more gross profit is insured, but the later months of a longer period carry lower expected loss, so the increase is generally modest relative to the protection added. The exact effect depends on the risk and the insurer.

What happens to the sum insured if we extend the period?

It must be projected across the full period — a 24-month period needs roughly two years of projected gross profit — or covered by a declaration-linked arrangement with the declaration calculated on the policy definition. Extending the period without adjusting the figure recreates the underinsurance in a different form.

Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority (FRN 724952). This page is general information, not advice on a specific policy.