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Business interruption is not rated in isolation — it sits on top of the property risk, so underwriters start with the physical exposure: construction, fire protection, flood zone, occupancy and the loss history of the premises. The interruption cover then turns on how long the business would take to recover and how much income is at stake in that window.
The sum insured. Underwriters look closely at how gross profit has been calculated, because the figure drives both the premium and the payout. Gross profit for insurance purposes is not the accountant's gross profit — it is turnover less the specific variable charges the policy allows you to deduct. Getting the definition wrong is the single most common cause of underinsurance.
The maximum indemnity period. This is the longest period for which the policy will pay, and it must reflect a realistic worst case, not a best case. Rebuilding after a total fire, obtaining planning and building control sign-off, re-fitting, re-sourcing specialist plant and rebuilding a customer base can take far longer than owners assume. Twelve months is frequently too short; 24 or 36 months is common for anything with bespoke premises, long lead-time machinery or seasonal trade.
Trend and growth. The sum insured should be projected forward to the end of the indemnity period, allowing for growth and inflation, so that cover keeps pace with a business that is expanding while the policy runs.
Concentration and dependency. Single-site operations, reliance on one key supplier or customer, and specialist or irreplaceable plant all raise the recovery time and therefore the exposure. Underwriters will price and, occasionally, sub-limit these features.
Fire destroys a section of a manufacturing unit; production halts for eleven months while plant is re-sourced and the building is reinstated — loss of gross profit and increased cost of working respond across the indemnity period.
An escape of water from a floor above floods a ground-floor retail unit, closing it for the fit-out period — lost gross profit plus the cost of a temporary trading location under increased cost of working.
A river or surface-water flood renders premises untenantable for months; alongside the property claim, the business interruption section covers the trading shortfall and, for a landlord, the loss of rent while tenants cannot occupy.
A fire at a key supplier's factory stops your production line even though your own premises are undamaged — the suppliers' extension responds, provided that extension was arranged and the supplier declared.
A fire in a neighbouring unit leads the authorities to cordon the whole estate, denying access to your undamaged premises — the denial of access / prevention of access extension responds, subject to its distance and time conditions.
A fire destroys your accounting server and paper records so you cannot prove outstanding customer balances — the book debts cover responds where it has been included.
Underinsurance on the sum insured. If the declared gross profit is lower than the true figure, the policy is subject to average (or the equivalent condition of average / underinsurance clause) and any payout is scaled down in the same proportion — a shortfall that only comes to light when the business can least afford it. Because the figure has to be projected across the whole indemnity period, it is easy to under-declare without realising. Our free underinsurance check at /underinsurance-check/ stress-tests the number before you ever need to claim.
An indemnity period that is too short. Setting 12 months to save premium is a false economy if a real fire would take two years to trade back from. When the indemnity period expires, cover stops — even if the business is still not recovered. This is the second-most-common cause of a disappointing settlement.
Breached policy conditions. Warranties and conditions precedent — intruder and fire alarm maintenance, hot-works permits, housekeeping, waste removal — sit under the property section that triggers the interruption cover. Breach them and the underlying property claim, and with it the business interruption claim, can be reduced or declined.
Undeclared activities or premises. A new site, a change of trade, a bolt-on activity or a material change in turnover that is not notified can leave part of the business uncovered or give the insurer grounds to reduce a claim.
Missing extensions. Supplier, customer, utilities and denial-of-access exposures are not automatically covered to a meaningful level. If the risk that closes you down sits at a third party's premises and no extension was arranged, there may be no cover at all.
Business interruption cover itself is not compulsory, but it interacts with duties that are. Where a lease or a commercial loan requires you to insure the property and maintain business continuity, the wording of your finance or tenancy agreement may specify minimum cover — check it against your policy.
Under the Insurance Act 2015, a commercial policyholder has a duty of fair presentation — to disclose every material circumstance it knows or ought to know, made in a reasonably clear and accessible way. Incomplete or careless presentation of turnover, occupancy or activities gives the insurer remedies that can reduce or avoid a claim. Presenting the risk fairly and fully is exactly where a broker earns its place.
If you employ staff, Employers' liability cover is separately compulsory under the Employers' Liability (Compulsory Insurance) Act 1969; business interruption does not replace it, but a prolonged closure raises real questions about continuing to pay and retain staff, which the sum insured should reflect through the payroll basis you choose.
Where an interruption arises from a wider event — for example a notifiable disease or a mains failure — cover depends entirely on the specific extension wording and its conditions. Recent years have shown how much turns on the precise policy language, so the scope of any such extension should be confirmed in writing rather than assumed.
Tell us about your business and we’ll place it on the specialist market — or leave your number and a named broker calls you back, usually the same working day.
