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Insurance exclusion clauses: when are they valid?

When a claim arises, the insured sometimes discovers that their contract contains a clause allowing the insurer to refuse coverage. However, this exclusion clause must first be valid and enforceable against the insurer.

Insurance law strictly regulates exclusion clauses. They must be clearly identifiable in the contract, but also drafted in sufficiently precise terms to allow the insured to know exactly the situations in which they will not be covered.

An exclusion clause that is imprecise, too general, or open to interpretation may be deemed unenforceable. The insurer must then cover the claim, provided that it falls within the original scope of the policy.

What is a warranty exclusion clause?

An exclusion clause is a contractual stipulation by which the insurer excludes from coverage certain events, behaviors or circumstances that would normally have been covered.

It thus negatively delimits the insured risk.

For example, a contract may exclude:

• damage resulting from a precisely defined lack of maintenance;
• claims arising from undeclared activity;
• certain damages caused under the influence of alcohol or narcotics;
• the consequences of a specific voluntary act;
• certain geographical, technical or professional risks expressly identified.

The exclusion clause should not, however, be confused with a condition of the guarantee.

The guarantee condition defines the circumstances under which the insurance can be invoked. The exclusion, on the other hand, deprives the insured of the benefit of a guarantee that would, in principle, apply.

This distinction is essential in the event of a dispute: the insured must demonstrate that the loss falls within the coverage subscribed to, while it is up to the insurer who invokes an exclusion to establish its existence and the conditions of application.

An exclusion clause must be "formal and limited"

According toArticle L. 113-1 of the Insurance Code, losses and damages resulting from an unforeseen event or from the fault of the insured are the responsibility of the insurer, except in the presence of a "formal and limited exclusion contained in the policy".

These two requirements are cumulative.

A formal exclusion

A clause is formal when it is written in a clear, precise and unambiguous manner.

The insured should be able to understand, simply by reading the contract, which events or behaviors are not covered. They should not have to interpret the clause, make complex connections between several stipulations, or wait for a claim to occur to discover its scope.

An exclusion based on indeterminate expressions such as "lack of maintenance", "negligent" behavior, "abnormal" use or a violation of "best practices" can therefore be challenged if the contract does not precisely define the facts concerned.

Case law regularly considers that a clause requiring interpretation is not sufficiently formal.

A limited exclusion

The clause must also be limited. It cannot be so broad as to negate the essential elements of the guarantee purchased.

After application of the exclusion, the guarantee must retain real and effective content.

A clause that would exclude virtually all claims corresponding to the risk normally covered could therefore be declared unenforceable. The insurer cannot offer coverage in the special conditions of the contract and then render it meaningless through an exceptionally broad exclusion in the general conditions.

The examination must be carried out with regard to the overall economics of the contract, the definition of the guarantee and the concrete scope of the exclusion.

The clause must be presented in very conspicuous characters

The precision of the clause is not enough. Its physical presentation must also attract the insured's attention.

ArticleL. 112-4 of the Insurance Code provides that clauses stipulating exclusions are only valid if they are mentioned in very conspicuous characters.

This requirement does not simply mean that the clause must be legible. It must stand out sufficiently from the rest of the contract to immediately attract the subscriber's attention.

According to the document's presentation, this highlighting can result from:

• with an explicit title;
• bold text;
• of a distinct font or size;
• from a box;
• of a particular color;
• from a clearly identifiable location in the contract.

A clause buried in the general terms and conditions, presented in a typography identical to the other stipulations or distributed between several paragraphs may be deemed unenforceable, even if its content is relatively precise.

The assessment is, however, concrete: the policy must be examined as a whole and not just the disputed clause reproduced in isolation.

The insurer must prove that the exclusion applies

When refusing coverage, the insurer cannot simply cite an exclusion found in the general terms and conditions.

It is up to him to demonstrate:

• that the clause has been brought to the insured's attention;
• that it is formal and limited;
• that it is presented in very conspicuous characters;
• that the general conditions which contain it are enforceable against the subscriber;
• that the precise circumstances of the loss correspond to the hypothesis targeted by the exclusion.

The refusal of a guarantee must therefore be justified and compared with the facts of the case.

For example, when the exclusion relates to the exercise of an undeclared activity, the insurer must establish that the damage actually originates from that activity. Similarly, if the clause is based on the non-performance of a specific obligation, the insurer must demonstrate this non-performance and its connection to the loss when required by the contract.

The analysis cannot therefore be limited to the abstract reading of the policy: it requires comparing the contract, the circumstances of the loss, the declarations made during the subscription and the technical or expert documents.

Contractual exclusion and intentional misconduct: two different mechanisms

Article L. 113-1 of the Insurance Code also provides that the insurer is not liable for losses and damages resulting from an intentional or fraudulent fault of the insured.

This is a legal exclusion, which is distinct from exclusions provided for in the contract.

Intentional misconduct implies that the insured intended to cause the damage as it occurred. Fraudulent misconduct may be established when the insured deliberately adopted a course of action that they could not have been unaware would inevitably lead to the damage.

These errors should not be confused with simple imprudence, negligence, or even a particularly serious mistake. In principle, insurance is specifically designed to cover the consequences of certain errors committed by the insured.

An insurer alleging intentional or fraudulent misconduct must therefore provide proof. Such misconduct cannot be presumed solely based on the seriousness of the alleged behavior.

Can exclusion be used to penalize the disappearance of randomness?

The issue of risk is playing an increasingly important role in insurance disputes.

In a ruling dated March 12, 2026, the second civil chamber of the Court of Cassation admitted that a contract may include a clause excluding the guarantee in the event of the disappearance of the risk during the term of the contract.

Such an exclusion can apply without requiring proof of intentional or fraudulent misconduct on the part of the insured. However, like any contractual exclusion, it must be explicit and limited.

This decision illustrates the distinction between:

• legal exclusion resulting from intentional or fraudulent misconduct;
• contractual exclusion based on precisely defined circumstances eliminating the element of chance.

In practice, an insured party who is aware of the existence of a serious disorder and who persistently refrains from taking the measures expressly provided for in the contract could have a clause relating to the disappearance of the risk invoked against them, provided that it precisely describes the situations concerned.

The decision also reiterates an important procedural point: challenges to the formal and limited nature of a clause must be raised before the lower courts. They cannot necessarily be raised for the first time before the Court of Cassation.

How to contest a warranty refusal?

The insurer's letter of refusal does not constitute the end of the case. Several checks must be carried out before accepting the application of the exclusion.

In particular, it is necessary to examine:

1. Does the claim fall within the definition of the guarantee?
   The first step is to precisely identify the guarantee invoked and verify that the reported event falls within its scope.
2. Does the clause in question actually constitute an exclusion?
   The insurer's classification is not decisive. A stipulation presented as a mere condition can, through its effects, constitute a genuine exclusion of coverage.
3. Are the general terms and conditions enforceable?
   The insurer must be able to establish that the insured received and accepted them when subscribing to or modifying the contract.
4. Is the clause sufficiently clear?
   Any vague, subjective, or undefined notion must be examined. If the scope of the exclusion requires interpretation, its validity may be challenged.
5. Does the exclusion leave any effective guarantee in place?
   A clause that is too broad can render the guarantee meaningless.
6. Is the presentation of the clause sufficiently apparent?
   The typography, layout and placement of the stipulation must be checked.
7. Do the facts of the claim correspond exactly to the exclusion?
   The insurer must establish that the precise circumstances of the case fall within the scope of the clause.

The dispute can begin with a reasoned request for review, accompanied by relevant documents. Depending on the nature and extent of the damage, an amicable expert assessment, referral to the competent mediator, or legal action may then be considered.

It is also important to monitor the applicable limitation periods. In principle, actions arising from an insurance contract are subject to the two-year limitation period provided for inArticle L. 114-1 of the Insurance Code, subject to specific rules, grounds for interruption and case law developments that may affect its enforceability.

What are the key points to remember about exclusion clauses in insurance?

An exclusion clause is not enforceable against the insured simply because it appears in the contract.

To be effective, it must:

• having been brought to the insured's attention;
• to be presented in very conspicuous characters;
• it must be written in clear and precise terms;
• target sufficiently defined circumstances;
• not to render the guarantee meaningless;
• correspond exactly to the circumstances of the disaster.

Analyzing a denial of coverage therefore requires a thorough reading of the contract and a precise examination of the facts. It cannot be based solely on the insurer's assertion that the claim is "excluded".

The Insurance Law department of ARST Avocats assists companies, professionals and individuals in the analysis of insurance policies, the contesting of refusals of guarantee, the monitoring of expert assessments and the litigation opposing insured parties, insurers and insurance intermediaries.

Article written by Morgan Jamet,
Partner – ARST Avocats