What Is a Hammer Clause in Professional Liability Insurance?

Short Answer

A hammer clause determines what happens when your professional liability insurer recommends settling a claim but you want to keep defending it. If you refuse the recommended settlement and the case later resolves for more, a hammer clause can shift some or all of the extra cost onto you. The exact split depends entirely on the policy wording, so architects and engineers should never assume their clause works the same way as one they've heard about from another firm.

What a consent-to-settle provision does

Most A&E professional liability policies require the insurer to get your consent before settling a claim. This protects you from having your insurer settle a case you believe you could win, sometimes over your objection.

A hammer clause is the flip side of that protection. It sets a consequence for withholding consent when the insurer wants to settle and you say no. Without a hammer clause, an insured could refuse every proposed settlement with no financial downside, since the carrier would keep paying full defense costs regardless of outcome.

Why professionals sometimes don't want to settle

Architects and engineers often resist a recommended settlement for reasons beyond the dollar amount.

Reputation is one factor. A settlement can look like an admission of fault to future clients, even when it isn't one legally.

Precedent is another. A firm worried that settling one claim will invite similar claims, or signal to the market that a particular design approach is vulnerable, may prefer to defend the case on the merits instead.

Some professionals also genuinely believe they weren't negligent and want a judgment that reflects that, not a negotiated number.

No hammer, 50/50, and 80/20 wording

These terms describe how the extra cost gets split after the insured refuses a recommended settlement:

No hammer clause. The carrier cannot force a settlement. If you refuse, the carrier continues covering defense costs and any eventual judgment under the policy's normal terms, without added penalty for saying no.

50/50 hammer clause. Once you refuse the recommended settlement, the carrier's responsibility for costs above that recommended amount is capped, often at half. You become responsible for the rest, whether that shows up in added defense costs, the eventual judgment, or both.

80/20 hammer clause. Similar structure, but with a different split. The carrier might cover 80 percent of costs beyond the recommended settlement while you cover 20 percent.

These percentages and mechanics vary by carrier and by form. Some clauses apply the split to defense costs only, others to the final judgment, and others to both. Reading the actual clause is the only way to know which applies to your policy.

How post-recommendation costs may be allocated

Once a hammer clause is triggered, the policy typically distinguishes between costs incurred before the refusal and costs incurred after it. Costs incurred before you rejected the settlement are usually covered under the policy's normal terms. Costs incurred afterward, including additional defense expense and any amount by which the final resolution exceeds the recommended settlement, are where the hammer clause split applies.

The specific mechanics, including whether the split applies to a full amount or just the difference above the recommended settlement, depend on how the clause is drafted.

Why the exact wording matters

Two policies can both be described as having an "80/20 hammer clause" and still work differently. Some apply the split only to the amount above the original settlement recommendation. Others apply it more broadly. Some trigger the clause the moment you decline in writing, others require additional steps.

Because of this variation, no reader should assume a percentage split works identically across carriers. The only reliable way to know is to read the specific consent-to-settle and hammer clause language in your own policy.

Example

An insurer recommends settling an engineering claim for $100,000. The engineer believes there was no negligence and refuses. Litigation continues, generating another $80,000 in defense expense, and the case eventually resolves for more than the original $100,000 recommendation.

Under a no hammer clause, the carrier would likely continue covering these costs under the policy's normal terms. Under a 50/50 or 80/20 hammer clause, some portion of the costs incurred after the refusal could shift to the engineer, depending on how the clause defines the split and what it applies to. This example is conceptual. The actual outcome depends entirely on the specific policy language.

What to check in your own policy

• Look for a “consent to settle” or “hammer clause” provision, often near the claims or conditions section
• Check whether the clause is no hammer, or includes a percentage split
• Confirm whether the split applies to defense costs, the judgment, or both
• Check what costs count as “before” versus “after” the refusal
• Ask your broker to walk through how the clause would apply in a real scenario

Related Questions

What is a consent-to-settle clause?

It's a policy provision requiring the insurer to get your approval before settling a claim on your behalf. A hammer clause sets the consequence if you withhold that approval.

What does a 50/50 hammer clause mean?

Generally, it means that once you refuse a recommended settlement, the carrier's responsibility for costs above that amount is capped at half, with you responsible for the rest. The specific mechanics vary by policy.

Is an 80/20 hammer clause better than a 50/50 hammer clause?

Not necessarily. A lower percentage of cost exposure sounds favorable, but the trigger, scope, and calculation method matter as much as the split itself. One clause isn't automatically better just because of the ratio.

Can I avoid a hammer clause entirely?

Some policies are written without one. Availability depends on the carrier and form. Ask your broker whether a no hammer option exists on the policies you're comparing.

Where do I find the hammer clause in my policy?

Look in the claims-handling or conditions section for language about consent to settle. If you can't locate it, ask your broker or carrier to point you to the specific provision.

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Author:

Hardcover Editorial Team

Reviewed by:

Hardcover Insurance Team

Last reviewed:

September 25, 2026

This article is educational and does not provide legal advice or determine whether a specific claim is covered. Policy terms, exclusions, underwriting requirements, and applicable law vary. Consult your insurance professional and qualified legal counsel regarding your circumstances.