When a person brings a case to court, the judge first checks whether they have the right to do so. Even before examining the merits of the dispute, the court assesses the admissibility of the request. Article 31 of the Code of Civil Procedure establishes the central rule of this filter: only those who can demonstrate a legitimate interest may take legal action.
This text, brief in its formulation, has concrete effects before every judicial court, every court of appeal, and even before the Court of Cassation. Understanding its mechanism helps avoid a dismissal for lack of admissibility, meaning a rejection of the request without the judge ever examining the case on its merits.
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Interest in acting and standing to sue: two distinct filters of the CPC
Article 31 of the Code of Civil Procedure mentions two concepts in the same sentence, and confusion between the two remains common. The interest in acting, on one hand, refers to the concrete advantage that the claimant derives from the lawsuit. Standing to sue, on the other hand, refers to the legal title that allows a specific person to make the claim.
An example clarifies the distinction. You are a tenant, and your neighbor damages the building’s facade. You suffer a nuisance: you have an interest in acting. However, to request the repair of the facade itself, only the owner or the homeowners’ association has standing to sue. Your request, if it concerns the facade, will be declared inadmissible, not because it is unfounded, but because you lack standing.
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As explained in Article 31 of the Code of Civil Procedure on Contre Informations, this distinction has direct practical consequences on the litigation strategy of a claimant.
This difference is far from theoretical. Before the judicial court, the defendant can raise a dismissal for lack of standing at any time during the proceedings, including on appeal. The judge can even raise it ex officio.
Dismissal for lack of standing based on Article 31: consequences in proceedings
When a defendant invokes Article 31, they raise a dismissal for lack of standing. This defense mechanism is clearly distinct from procedural exceptions (formal defects, lack of jurisdiction) and substantive defenses (disputing the right itself).
Why does this distinction matter for the litigant? Because the legal regime differs on a crucial point: the dismissal for lack of standing can be raised at any stage of the proceedings. Unlike procedural exceptions, which must generally be presented before any substantive defense, the lack of interest or standing can arise in first instance, on appeal, and even for the first time before the Court of Cassation in certain cases.
Admissibility review and merits review: do not confuse
A common mistake is to mix the examination of admissibility with that of the merits. The judge who checks the interest in acting does not ask whether the claimant is right. They only verify whether this person derives sufficient advantage from the success of their claim.
Real estate law practitioners highlighted this confusion in 2026: some litigants attempt to use the dismissal for lack of interest as a means to filter actions by confusing it with a merits review. The court must, however, strictly separate the two stages.
- The admissibility review (Article 31 CPC) concerns the existence of a legitimate interest and, if applicable, standing to sue.
- The merits review concerns the substantive right invoked: is the claimant right in their claim?
- A request can be admissible (the claimant has interest and standing) while being rejected on the merits (the invoked right is not established).
Article 31 in specific disputes: request for interpretation and partition of co-ownership
Article 31 is not limited to classic disputes between two parties. It serves as a criterion for admissibility in specific procedural mechanisms, sometimes little known.
Request for interpretation of a court decision
Articles 461 and 481 of the CPC allow a judge to interpret their own decision when it presents obscurity or contradiction. For this request to be admissible, the claimant must demonstrate an interest in acting as per Article 31. If the decision is clear and unambiguous, the request will be rejected for lack of interest. The Court of Cassation (2nd civil chamber, October 22, 2009, No. 07-21.834) confirmed this principle.
Action for partition of co-ownership
In property law, Article 31 underpins the admissibility of the action for partition. The claimant must prove a personal and direct interest related to their status as a co-owner. A third party without a link to the co-ownership cannot request the partition, even if they find an indirect economic advantage.
Popular action and limits set by civil jurisdiction
Article 31 acts as a lock against what French law calls popular action. This type of action, by which a citizen would act in the public interest without justifying personal harm, is generally inadmissible before civil courts.
The law provides exceptions: certain associations or organizations are granted standing to sue by specific texts, even without personal interest. This is the reservation mentioned in the second part of Article 31, which targets “persons that the law qualifies to raise or contest a claim, or to defend a specific interest.”
- Approved consumer associations can act in representation of a collective interest, based on legal authorization.
- Professional unions have a right of action to defend the collective interest of the profession.
- Outside of these cases provided by law, an individual acting for “the principle” without personal harm will have their request declared inadmissible.
This framework explains why, before the judicial court or the court of appeal, the first reflex of a defense lawyer often consists of checking whether the claimant meets the conditions of Article 31. A defense based on lack of interest or standing, if successful, ends the proceedings without examination of the merits, which represents a considerable saving of time and cost for the defendant.
Article 31 of the Code of Civil Procedure remains the foundation of any civil legal action. Mastery of it conditions the strategy from the drafting of the summons: precisely identifying who is acting, on what grounds, and what concrete advantage they expect from it. Neglecting this check exposes one to a dismissal for lack of standing that the judge can raise ex officio at any stage of the proceedings.