Category: Insurance definitions · Reviewed by Jake Leat, Associate Director · Last reviewed May 2026
A defamation extension in a professional indemnity policy extends cover to claims of libel and slander arising from the firm’s professional activities. PI policies typically exclude defamation as standard; the extension carves it back in, usually subject to a sub-limit, a requirement that the statement was made in good faith in the ordinary course of business, and the exclusion of any deliberate or malicious defamation.
The cover matters for any firm that produces written advice, reports, valuations, articles, witness statements or public commentary as part of its professional work. Under the Defamation Act 2013 the threshold for a successful claim is high but defence costs alone can run into substantial figures. For the wider PI picture, see the Ultimate UK Professional Indemnity Insurance Guide 2026.
Defamation is the legal wrong of publishing a statement that damages the reputation of a person or company. In English law it comes in two forms: libel (written or otherwise permanent) and slander (spoken or transient). The Defamation Act 2013 requires the claimant to show that the statement has caused, or is likely to cause, serious harm to reputation — a higher threshold than under the previous law.
Standard PI policies exclude defamation because it is treated as a distinct intentional-tort exposure rather than ordinary professional negligence. A separate “defamation extension” or “libel and slander extension” puts cover back in for inadvertent defamation committed in the course of providing professional services.
The extension typically responds to:
The extension does not respond to defamation that was deliberate, knowing or malicious. It also does not respond to defamation that arises from work the firm performed outside the scope of its professional services — for example, a partner’s personal social media post unconnected to the firm’s work.
The mechanics of a defamation extension typically work like this:
Trigger. A statement made by the firm or one of its employees in the course of professional services becomes the subject of a complaint or claim. The statement might be in a written report, an email to a third party, a published article, a witness statement, or a public-facing comment.
Notification. Defamation claims usually arrive with a letter before action under the pre-action protocol, often demanding retraction. Early notification to the insurer matters — defamation claims escalate quickly and remedies can include injunctive relief that the policy may or may not cover.
Defence and settlement. The insurer normally appoints solicitors with defamation experience. Defences typically run on truth, honest opinion, qualified privilege (which protects many professional reports) or publication on a matter of public interest. The legal cost of running a contested defamation case is high — six-figure defence spend is common even in moderate claims.
Settlement. Many defamation claims settle on terms involving a retraction, an apology and a contribution to the claimant’s costs. The policy generally covers all three within the sub-limit.
Sub-limit. The defamation extension is almost always sub-limited rather than carrying the full PI limit. Sub-limits of £100,000, £250,000, £500,000 or £1m in the aggregate are common.
A Bristol-based surveying practice with annual fee income of £350,000 carries £1m PI cover with a £5,000 excess. The policy includes a defamation extension sub-limited to £250,000 in the aggregate.
The firm produces a structural report on a commercial property for a buyer. The report describes the previous works as “incompetently executed” and names the contractor who carried them out. The named contractor sues the surveying firm for libel, claiming serious harm to its reputation and lost business.
Under the policy:
Without the extension, the firm would have faced the full £155,000 from its own resources, and would have had to source its own defamation counsel.
These figures are illustrative. Defence costs in defamation cases vary widely with complexity, and settlement values depend on the seriousness of the harm alleged.
The defamation extension matters most for firms whose professional work produces reports, opinions or commentary on identifiable third parties. The exposure points include:
It also matters for any firm with a social media or marketing presence where employees comment on industry matters or competitors. The line between protected fair comment and actionable defamation is not always clear.
Wordings vary in important ways:
Sub-limit structure. Most extensions carry a sub-limit on the aggregate amount payable in the policy year. Sub-limits commonly sit between £100,000 and £1m. A higher sub-limit usually requires a small additional premium.
Defence costs inside or outside the sub-limit. Where defence costs sit inside the sub-limit, the available indemnity for damages is reduced by the legal spend. Where defence costs sit outside the sub-limit (and outside the main PI limit), the cover is materially more valuable. Read the policy wording carefully.
Good faith requirement. Most extensions require the defamatory statement to have been made in good faith. A statement made knowing it was untrue, or with reckless disregard for its truth, is not covered.
Pre-action conduct. Some wordings require the insured to issue an apology, retraction or correction promptly if requested, before the claim escalates. Failure to do so can affect cover.
Injunctive relief. Defamation claims sometimes seek an injunction to prevent further publication. The cost of defending the injunction is usually within the cover; the injunction itself is not “damages” and is not “compensation” but a court order.
Malicious falsehood. A close cousin of defamation — covered by some extensions, excluded by others. Worth checking if the firm produces comparative commentary or marketing about competitors.
Punitive or exemplary damages. UK courts do not award punitive damages in defamation as a rule, but where any aggravated damages element arises, some wordings exclude it.
The defamation extension sits alongside the intellectual property infringement extension, which addresses the related but separate exposure of copyright, trademark or design right infringement in published material. Firms that publish reports digitally should also consider the cyber exclusion, which interacts with online defamation. The dishonesty extension is a separate carve-back addressing deliberate wrongdoing of a different kind.
Is the defamation extension automatic on UK PI policies?
It depends on the wording. Most mid-market and higher-quality PI policies include the defamation extension as standard within the wording, usually with a sub-limit. Smaller package policies, particularly those at the lower end of the SME market, may not include it or may apply a very low sub-limit. Always check the schedule for the words “defamation”, “libel and slander” or “personal injury extension” — some insurers bundle defamation into a wider personal injury carve-back.
What is the difference between libel and slander, and does the extension cover both?
Libel is defamation in a permanent form — written, printed, broadcast or online. Slander is defamation in a transient form — spoken. The Defamation Act 2013 raised the threshold for both but kept the distinction. Most PI extensions cover both libel and slander. Wordings that refer only to “defamation” cover both forms as a matter of law.
Does the extension cover online defamation, including social media?
Yes, where the statement was made in the course of the firm’s professional services. A statement posted to the firm’s official business social media account, or a comment in a published online article, normally falls within the cover. A purely personal social media post by an employee, unconnected to professional work, normally does not. The line can be hard to draw and is fact-specific.
Does the extension cover statements in reports prepared for litigation?
Statements in expert reports and witness statements prepared for legal proceedings usually attract qualified privilege, meaning they are protected from defamation claims as long as they were made without malice. The extension covers the cost of running that defence and any damages if it fails. Some wordings explicitly carve in expert witness work; others rely on the general scope of professional services.
What is “serious harm” under the Defamation Act 2013?
The Defamation Act 2013 requires the claimant to show that the publication has caused, or is likely to cause, serious harm to reputation. For trading companies, the harm must be serious financial loss. The threshold filters out many trivial claims at an early stage and a substantial number of complaints never become claims. The cost of defending up to that point can still be material.
Does the extension cover injunctions to prevent publication?
Defending an application for an injunction is usually within the cover as defence costs. The injunction itself, if granted, is a court order rather than a damages award and is not “indemnified” in the ordinary sense. The firm would simply have to comply with the order. The reputational and commercial impact of an injunction can be significant and is not within the policy.
Are claims by employees for defamation covered?
Generally not under PI. A claim by an employee for defamation arising from internal employment matters — references, performance reviews, dismissal communications — is more naturally covered by employment practices liability insurance (EPLI), which is a separate product. Some PI policies will respond to employee defamation claims; many treat them as outside the professional services trigger.
Can the sub-limit on the defamation extension be increased?
Yes, in most markets, for a small additional premium. Firms with significant defamation exposure — investigators, journalists, public-facing consultancies, expert witnesses on contested matters — typically buy a higher sub-limit, often matched to the main PI limit. Insurers may require a content review process to be in place before agreeing to higher limits.
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Apex Insurance Brokers Ltd is a Bristol-based insurance broker authorised and regulated by the Financial Conduct Authority, firm reference number 724952. The firm is registered at Companies House under number 07014570. We can be contacted at info@apexinsurancebrokers.co.uk or on 0117 325 0027.
Last reviewed: May 2026 by Apex Insurance Brokers Ltd.
Important: this article is general information, not advice on your specific circumstances. For advice on PI insurance for your firm, contact us on 0117 325 0027 or info@apexinsurancebrokers.co.uk.
Apex Insurance Brokers serves UK professional services firms and commercial businesses. Call 0117 325 0027, email hello@apexinsurancebrokers.co.uk, or request a quotation.
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