Consent to settle and the ‘hammer clause’ explained

Reviewed by Apex Insurance Brokers · Last reviewed 2026-08-05

When a professional indemnity (PI) claim lands, two people have a stake in how it ends: you, whose reputation is on the line, and your insurer, who pays the bill. Consent-to-settle wording sets out how that tension is resolved. The “hammer clause” is the mechanism that stops a policyholder holding out on principle at the insurer’s unlimited expense. This page explains how both work in UK PI policies and what a refusal can actually cost you.

Who controls settlement in a PI claim?

It depends entirely on your policy wording. There is no single statutory rule — this is contract, negotiated between insurer and insured. Broadly, PI policies fall into three camps:

• Insurer-led with your consent required. The insurer conducts the defence and negotiates, but cannot settle without your agreement. This is common and protects your reputation, but is where the hammer clause usually bites.
• Insurer-led, consent not required. Some wordings let the insurer settle at its discretion. You lose control but avoid the risk of being penalised for refusing.
• Consent not to be unreasonably withheld. A middle ground: you can object, but only for good reason. Withhold consent unreasonably and the insurer may fall back on the hammer clause or cease to indemnify you.

Read your own schedule and policy conditions. The label matters less than the exact words that follow it.

What is the hammer clause?

The hammer clause — sometimes called a “blackmail clause” or simply the consent-to-settle limitation — applies when your insurer recommends settling a claim on terms it considers reasonable and you refuse to agree. The clause caps the insurer’s liability at the amount for which the claim could have been settled, plus the defence costs incurred up to the date you refused.

Everything beyond that point — the extra damages if the case goes worse at trial, and the mounting legal costs of fighting on — becomes your problem, not the insurer’s. The clause exists so that an insurer is not forced to bankroll a hopeless or ego-driven fight indefinitely.

A worked example

Suppose a client alleges negligent advice and your insurer negotiates a settlement offer of £120,000, with £30,000 of defence costs already spent. Your insurer advises you to accept. You refuse, believing you did nothing wrong.

Figures are illustrative. The point is that the downside of refusing sits with you, while the upside of a successful fight benefits your reputation. That asymmetry is exactly what the clause is designed to create.

The Senior Counsel (QC/KC) clause: a safeguard against the hammer

Many PI policies pair the hammer clause with a “Senior Counsel clause” (often still called a QC clause). This provides that the insurer will not require you to contest — and, in stronger wordings, will not require you to settle — unless independent senior counsel advises on the merits.

The typical formulation: neither insurer nor insured is obliged to contest proceedings unless a mutually agreed King’s Counsel advises the matter has reasonable prospects of being contested successfully. This is a genuine protection. It means an insurer cannot simply invoke the hammer to strong-arm you into an early settlement that harms your reputation — there has to be an objective, expert view on whether the fight is worth having. If counsel says the case is defensible, the calculus changes.

Check whether your policy has a Senior Counsel clause and how it is drafted. Its absence materially weakens your negotiating position when a claim turns contentious.

Why insurers and professionals see settlement differently

The friction is real and predictable:

• Reputation vs. cost. A quick settlement can read as an admission — damaging for a professional whose livelihood depends on trust. The insurer, by contrast, is managing a portfolio and pricing certainty.
• “No admission of liability” wording. Most settlements are made expressly without admission. This can soften the reputational hit, and it is worth confirming your insurer will insist on it.
• Regulatory reporting. Depending on your profession and its regulator, a claim or settlement may need to be disclosed. Factor that in before you dig in.

The sensible approach is to engage early, understand your wording before a claim arises, and treat your broker and defence solicitor as allies in framing any settlement so it protects you as well as the insurer.

What to check in your own policy

• Does the insurer need your consent to settle, or can it settle at its discretion?
• Is there a hammer clause, and does it cap cover at the settlement figure plus costs to the date of refusal?
• Is there a Senior Counsel / QC clause, and does it cover both contesting and settling?
• Does the wording require consent “not to be unreasonably withheld”?
• Are settlements made without admission of liability as standard?

If you can’t answer these from your schedule, that is a conversation to have before a claim, not during one. Ask us to review your PI wording.

Common questions

Can my insurer settle a claim without my agreement?
Only if your policy allows it. Some wordings give the insurer full discretion; others require your consent, sometimes “not to be unreasonably withheld”. The answer is in your specific policy conditions, so check them before assuming you have a veto.

What happens if I refuse a settlement my insurer recommends?
If your policy contains a hammer clause, the insurer’s liability is capped at the amount the claim could have been settled for, plus defence costs to the date you refused. You then carry any further damages and legal costs. A Senior Counsel clause may protect you if independent counsel supports fighting the claim.

Is the hammer clause standard in UK PI policies?
It is very common, but wordings vary widely in how harshly it bites and whether a Senior Counsel clause tempers it. Because the financial exposure can be significant, it is worth comparing wordings rather than assuming one is like another.

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