Cross-Liability Clauses Explained

Reviewed by Matthew Bartlett, Director, Apex Insurance Brokers Limited · Last reviewed 2026-08-05

When several businesses share a single liability policy — a contractor and subcontractors on a joint names policy, a parent company and its subsidiaries, or partners in a joint venture — a problem arises. A policy indemnifies the insured against liability to third parties. But if everyone on the policy is an insured, is anyone a third party to anyone else? A cross-liability clause answers that question. This guide explains what the clause does, where it appears, and why it matters when a claim lands between people named on the same policy.

What a cross-liability clause actually does

A liability policy typically insures more than one party under a single contract, either by naming them individually or through a general "insured" definition covering group companies. The cross-liability clause — sometimes called a "separation of insureds" provision — treats each insured as though the policy had been issued to them separately.

The practical effect is twofold:

• One co-insured can claim against another. If Party A injures Party B, and both are insured under the same policy, Party B is treated as a third party in relation to Party A's liability. The insurer responds as if two separate policies existed.
• The conduct of one insured does not automatically prejudice another. A breach or act by one party is generally not held against an innocent co-insured, subject to the exact wording.

Crucially, a cross-liability clause does not increase the amount of cover. The limit of indemnity applies to the policy as a whole, not per insured, unless the wording says otherwise. Two co-insureds share one limit.

Why the clause is needed: the "own liability" problem

The starting point in English law is that a person cannot be liable to themselves, and you cannot insure against your own liability to yourself. If a policy simply names Company A and Company B as "the Insured" jointly, an insurer could argue that a claim by B against A is really a claim by "the Insured" against "the Insured" — a circular situation that falls outside cover.

The cross-liability clause dismantles that argument by legally separating the insureds. Each is placed in the position of holding their own policy, so a genuine claim between them can proceed.

This is why the clause features heavily in construction and contracting, where joint names policies are common. On a building project, the employer, main contractor and subcontractors may all be insured under one contract works or public liability policy. If a subcontractor negligently injures an employee of another subcontractor, cross-liability wording is what allows that claim to run through the shared policy.

Where you will find cross-liability wording

It appears most often in public and products liability, employers' liability, and contract works policies. It is far less common — and usually inappropriate — in professional indemnity, which insures your own professional negligence rather than shared operational risk.

Cross-liability is not the same as a shared limit

A frequent misunderstanding is that a cross-liability clause multiplies the cover. It does not. The clause governs who can claim, not how much is available. If your policy carries a £2m limit and two co-insureds are involved in the same incident, that £2m is the ceiling for the whole loss, not £2m each.

Some policies add an "aggregate limit per insured" or a specific cross-liability limit, but you should never assume this. Read the limit of indemnity section alongside the cross-liability wording — the two interact.

What the clause does and does not do

• It does allow co-insureds to be treated as separate parties for claims between them.
• It does usually protect an innocent insured from another insured's breach, depending on wording.
• It does not increase the policy limit unless expressly stated.
• It does not override exclusions — a claim still has to fall within cover in the first place.
• It does not remove the insurer's rights against the actual wrongdoer where the wording preserves them.

Because outcomes turn on the precise words, two policies that both mention "cross liability" can behave very differently. If a contract you are signing requires cross-liability cover, check that your policy genuinely delivers it — ask us to review the wording before you rely on it.

Common questions

Does a cross-liability clause double my cover for two insureds?

No. It changes who can claim, not the amount available. The limit of indemnity applies to the policy as a whole unless the wording specifically provides a limit per insured.

Is cross-liability the same as joint names?

Not quite. "Joint names" describes who is insured under the policy. A cross-liability clause describes how those named parties are treated in relation to each other. Joint names cover often needs a cross-liability clause to work properly for claims between the parties.

Do I need a cross-liability clause in a professional indemnity policy?

Usually not. PI insures your own professional negligence and rarely involves multiple operational co-insureds claiming against each other. Cross-liability is far more relevant to public, products, employers' and contract works liability. If you are unsure which cover a contract actually requires, ask a broker.

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.