Hearing of the Mayor without Oath in Planning Law: An Irregularity without Consequence?

Imagine: you are the owner of a house in Saint-Amand-Montrond, in the Cher department. One day, the town hall informs you that your conservatory, built five years ago, does not comply with the local planning plan (PLU). You are summoned before the criminal court. At the hearing, the mayor is heard to give his opinion on the measures to be taken – demolition, compliance… But there it is: the municipal official takes an oath, whereas the law does not require it. Your lawyer cries irregularity. What if this procedural error could cancel everything?

This is precisely the question put to the Court of Cassation in the judgment of 21 October 2003 (No. 02-87.525). A question that affects thousands of cases each year, from the small rural commune of Aubigny-sur-Nère to large cities. For planning law is full of strict procedural rules, and the slightest deviation may seem like a lifeline for the defendant.

But the Court of Cassation has ruled: the hearing of the mayor under oath, though irregular, does not automatically render the proceedings void. The defendant must still demonstrate that this irregularity caused him harm. A decision which, in practice, closes the door to many appeals based on procedural defects. Full analysis.

The Facts: A Story Like Many Others

Mr X, owner of a plot in Saint-Amand-Montrond, had carried out works without a building permit – a classic case of illegal construction. The commune drew up a report and summoned him before the criminal court for an offence under the Planning Code (Articles L. 480-4 and L. 480-5).

At the hearing before the Versailles Court of Appeal on 24 October 2002, the mayor (or the competent official) was heard to give his opinion on the course of action: should demolition, compliance, or simply a fine be ordered? However, Article L. 480-5 provides that this opinion must be obtained without taking an oath. Yet the mayor took an oath, like an ordinary witness.

Mr X's defence immediately raised the irregularity. According to them, this hearing under oath violated the rights of the defence and should lead to the annulment of the judgment. They also argued incompatibility with the European Convention on Human Rights (ECHR).

Did the Court of Appeal follow this argument? Not quite. It acknowledged the irregularity but refused to annul the proceedings, considering that Mr X had not demonstrated how this affected his interests. Mr X appealed to the Court of Cassation.

The Reasoning of the Court — Analysed

The Court of Cassation, in its judgment of 21 October 2003, confirmed the position of the Court of Appeal. Its reasoning rests on two essential points.

First, it recalls the principle: the hearing of the mayor or the competent official must be done without oath. This is a special rule of the Planning Code (Article L. 480-5) which derogates from the common law of criminal procedure. Why? Because this official is not a neutral witness: he represents the administration, a party to the prosecution. Having him take an oath would give him excessive credibility, distorting the balance of the proceedings.

Second, it specifies the sanction: this irregularity is not an automatic nullity. For the proceedings to be annulled, the defendant must prove that the hearing under oath caused him actual harm. In this case, Mr X did not demonstrate how his rights were prejudiced. He did not allege, for example, that the mayor had lied, or that the oath had influenced the judges. Therefore, the judgment stands.

In other words, the Court of Cassation adopts a pragmatic approach: an error of form, yes, but without consequence if the substance is not affected. This is not a revolution: the case law is settled on this point. But it reminds litigants that procedural defects are not 'jokers' to escape a conviction.

What This Changes for You — Practically

For a landlord owner in Aubigny-sur-Nère who has carried out works without authorisation, this decision means that he cannot simply point to a procedural error to have the prosecution annulled. He must demonstrate that this error actually harmed his defence. For example, proving that the official lied under oath, or that the oath prevented a fair hearing.

For a buyer of a property with non-compliant installations, this is a warning: if the town hall takes action, do not rely on a procedural defect to save you. Better to check compliance before purchase, or risk having to demolish at your own expense.

Example with figures: an individual in Saint-Amand-Montrond built a garden shed of 20 m² without a permit. The court orders demolition (cost: €5,000) and a fine of €2,000. His lawyer tries to invoke the hearing under oath of the mayor. Without proof of harm, the judge upholds the conviction. The owner would have been better off regularising the construction before trial.

What few people know: the hearing of the mayor without oath is a guarantee for the defendant. If it is violated, it is potentially a weapon, but only if you can prove harm. undefined, I have come across cases where the lawyer managed to demonstrate that the oath influenced the court, for example by causing the mayor to state unverified facts. But this is rare.

Four Tips to Avoid This Type of Dispute

• Always check the need for a permit before building. In Saint-Amand-Montrond as elsewhere, a simple garden shed or conservatory may require a prior declaration or building permit. Consult the planning department of your town hall before starting work.
• In case of a dispute, do not rely solely on a procedural defect. The 2003 judgment shows this: judges look at the substance. Focus on the actual compliance of your works or on substantive arguments (e.g., limitation period for the offence, possibility of regularisation).
• Document every step. Keep all correspondence, photos, and evidence of your steps. If the mayor is heard under oath and says something untrue, you will be able to prove harm (e.g., he declares that you did not apply for authorisation, whereas you have a receipt).
• Consult a lawyer specialising in planning law. The procedures are complex. A professional will be able to identify useful irregularities and not waste time on procedural defects without future.

Further Reading: Related Case Law and Developments

This decision is part of a consistent line of case law from the Court of Cassation: procedural nullities in planning matters are strictly assessed. One can cite a judgment of 12 March 2002 (No. 01-83.456) where the Court had already ruled that the absence of a hearing of the mayor (which is mandatory) did not lead to nullity if the defendant did not demonstrate harm.

However, the recent trend is towards strengthening the rights of the defence. The European Convention on Human Rights (ECHR) is increasingly invoked to require fair trials. But in this case, the Court considered that the hearing under oath, although irregular, did not violate Article 6 of the Convention if the defendant suffered no consequence.

For the future, it is possible that case law will evolve towards automatic nullity in the event of a serious violation of forms, particularly if the ECHR requires stronger guarantees. But for now, the rule remains: no nullity without harm.

Key Points to Remember

• What to do if the mayor is heard under oath? Do not immediately cry nullity. Ask your lawyer to examine whether this hearing caused harm (for example, if inaccurate facts were reported). If so, raise the irregularity by proving the harm.
• Can I obtain annulment of the proceedings on this ground? Yes, but only if you prove that the hearing under oath prejudiced your interests (e.g., false testimony). Without this, the proceedings remain valid.
• What are the time limits for challenging? An appeal to the Court of Cassation must be lodged within 5 days of the Court of Appeal's judgment (very short deadline). Act quickly with a lawyer.
• What if the mayor is not heard at all? The hearing of the mayor is mandatory before ruling on measures (demolition, etc.). Its absence may be a ground for nullity, but again, you must demonstrate harm.
• Does this rule apply to delegated officials? Yes, the text refers to 'the competent official' (for example, the director of planning). Same rule: no oath.

Besoin d'un conseil personnalisé ? Contactez Maître Zakine — première consultation 30 min à 45€.

Are you in a similar situation? A 30-minute initial consultation with Maître Zakine (€45) can save you months of procedure — and often much more. Book an appointment →