Denial of access extension

Category: Business interruption · Reviewed by the Apex broking team · Last reviewed 2026-08-22 · ~5 min read

The gap it fills

Standard business interruption cover is contingent on damage. The material damage proviso requires that property at the insured premises has suffered damage of a type insured under the property section, and that damage is what starts the indemnity period. A business whose own premises are untouched but whose customers cannot reach them — because the street is cordoned off, or a neighbouring building has collapsed, or the anchor unit in the centre has burned down — has a real loss and no claim.

The denial of access extension is the standard answer. It extends the definition of damage, or the insured perils, so that interruption resulting from prevention or hindrance of access to the insured premises is covered.

Damage-based wordings

The traditional extension is still damage-based, but the damage is to someone else’s property. Cover applies where property in the vicinity of the insured premises suffers damage by a peril insured under the policy, and that damage prevents or hinders access to or use of the insured premises. Two limbs therefore have to be satisfied: an insured peril operating on nearby property, and a causal link to the interruption at the insured location.

Wordings restrict the extension in three ways. A radius or vicinity requirement — sometimes a stated distance, sometimes the vaguer “in the vicinity” — limits how far away the damage may be. A maximum indemnity period, often much shorter than the main indemnity period, caps the duration. And a sub-limit caps the amount. It is common for all three to be materially tighter than the buyer assumes.

Non-damage denial of access

Non-damage extensions dispense with the requirement for physical damage and instead respond to an incident, an emergency, or action taken by a public authority such as the police or a local authority, which prevents or hinders access to the premises. These wordings are far more variable. Some require the action to follow a danger or disturbance within a stated distance; some require an emergency likely to endanger life or property; some are drafted around closure orders.

Related but distinct extensions cover loss of attraction (interruption caused by damage at a location that draws customers to the area), specified suppliers and specified customers, and public utilities. Buyers frequently conflate them. Each has its own trigger, and a loss that fails one may succeed under another.

What the FCA test case settled

The Supreme Court in Financial Conduct Authority v Arch Insurance (UK) Ltd [2021] UKSC 1, handed down on 15 January 2021, considered prevention of access and hybrid wordings alongside disease clauses. Two of its conclusions bear directly on how these extensions are read.

First, on what amounts to an inability to use premises: the Court rejected the requirement of a complete inability, holding that cover can be engaged where the policyholder is unable to use the premises for a discrete part of its business activities, or is unable to use a discrete part of its premises for its business activities. Second, on what counts as a restriction imposed by a public authority: the Court held that mandatory instructions could satisfy the requirement before they acquired the force of law, rather than only once legally binding.

The Court also held that the approach taken in the earlier Orient-Express Hotels decision was wrong, which matters for the counterfactual used when quantifying loss where the same underlying cause produced both the insured event and the wider circumstances. The judgment turned on the specific wordings before the Court, so it guides construction rather than dictating outcomes on other forms; but it substantially changed how prevention-of-access language is approached.

Reading your own extension

Work through the trigger in order. Does the extension require damage, or an incident, or action by an authority? By whom must the prevention be caused, and to what standard — prevented, or hindered, or denied? Is there a radius, and is it measured from the premises or from the damage? Is there a franchise or waiting period before cover attaches? What is the maximum indemnity period for the extension, and is it separate from the main indemnity period? Is there a sub-limit, and does it sit inside or outside the BI sum insured?

Then test it against the events that would actually stop the business: a fire in the adjoining unit, a police cordon after an incident on the street, a flood that closes the only access road, the failure of the neighbouring anchor tenant. Most disputes about these extensions turn out to be about the trigger, not about quantum.

Why it matters

Denial of access is one of the few extensions where the loss is large, the premises are undamaged, and the policyholder’s instinct is that nothing has happened to them. It is also one of the extensions most often left at a nominal sub-limit set years earlier. For any business whose trade depends on physical footfall, on a single access route, or on proximity to a larger attraction, it deserves a specific figure and a specific indemnity period rather than a default.

Frequently asked questions

Does a denial of access extension require damage?

It depends on the form. The traditional extension requires damage by an insured peril to property in the vicinity of the insured premises. Non-damage variants respond instead to an incident or to action by a public authority, without any physical damage.

Is there normally a distance limit?

Usually yes. Most wordings limit the extension by reference to a stated radius or to property 'in the vicinity', and separately impose a maximum indemnity period and a sub-limit that are often much tighter than the main business interruption cover.

What did FCA v Arch decide about inability to use premises?

That a complete inability is not required. Cover can be engaged where the policyholder is unable to use the premises for a discrete part of its business activities, or unable to use a discrete part of its premises for its business activities.

Do mandatory government instructions count as a restriction imposed?

On the wordings considered in the Supreme Court test case, instructions expressed in mandatory terms could satisfy the requirement before they were given the force of law. Whether that applies to a particular policy still depends on the words used in it.

Related entries

• Business interruption insurance
• PI business interruption extension
• Heatwave business interruption
• Proximate cause

This entry is part of the Apex Insurance Wiki. This entry states the position as at August 2026. It is insurance information, not legal advice. Last reviewed 2026-08-22. Next review: 2027-02-22.

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.