Building Permit: When a Judge Can Order Demolition Despite Authorisation

Imagine yourself in Capbreton, owner of a plot with an ocean view. You finally obtain that long-awaited building permit for your dream home. The work progresses, the walls go up, you see your project taking shape. But then a neighbour takes you to court, claiming that your construction encroaches on an easement (a legal restriction affecting your property) or does not comply with the rules of the PLU (Local Urban Plan, the document governing construction in your municipality). What to do? Your permit is valid, isn't that sufficient protection?

This situation, far from theoretical, is at the heart of a major decision by the Court of Cassation. Every year, in the jurisdiction of Mont-de-Marsan, dozens of property owners find themselves facing this dilemma: their project is authorised by the town hall, but challenged by those around them. Is the building permit an impenetrable shield against any legal action?

The answer, provided by France's highest judges, is nuanced and deserves to be understood by every property owner, tenant, or real estate professional. This decision clarifies a crucial point: the civil judge (who settles disputes between individuals) does indeed have the power to rule on the conformity of the works with the permit, even if the latter has not been annulled by the administrative judge. In short, having a permit does not protect you from possible demolition.

The Facts: A Story as Common as Any

The case begins like so many others. Mr. and Mrs. Martin, owners of a plot in Tarnos, decide to build a single-family house. They submit an application to the town hall, respect the deadlines, and obtain their precious sesame: the building permit. Relieved, they start the works. The foundations are poured, the walls rise. But their neighbour, Mr. Dubois, watches the construction with a concerned eye.

According to Mr. Dubois, the new house does not comply with several rules. First, it would encroach on a public utility easement (a restriction imposed in the public interest, such as a non-buildable zone near a watercourse). Secondly, it would not comply with the provisions of the Tarnos PLU, particularly regarding distance from boundary lines or maximum height. Mr. Dubois then initiates legal proceedings before the judicial tribunal. He does not request the annulment of the permit – that would fall under the administrative tribunal – but outright demolition of the construction, arguing that it causes abnormal neighbourhood disturbance and violates mandatory rules.

Before the tribunal, the Martins brandish their building permit. "How could one order the demolition of a legally authorised building?", they plead. The tribunal, then the court of appeal, rule in their favour at first instance. The judges consider that, since the permit has not been annulled, they cannot challenge its validity nor verify if the works comply with it. Mr. Dubois, persevering, appeals to the Court of Cassation. This is where the case takes a decisive turn.

The Court's Reasoning – Analysed

The Court of Cassation, seized of the appeal, makes a subtle but fundamental shift in case law. It first recalls an essential distinction: the administrative judge is competent to annul a building permit for ultra vires (i.e., if the administrative authority made an error of law in issuing it). The civil judge, on the other hand, is competent to settle disputes between individuals, particularly based on abnormal neighbourhood disturbance or non-compliance with planning rules.

In this case, the Court quashes the appeal court's judgment. Its reasoning can be summarised in one key sentence, repeated in the summary: "It falls to the civil judge, seized of an action for demolition [...] to rule, when this action is based on non-compliance with planning rules or public utility easements, on the conformity of the works carried out with the building permit." In other words, even if the permit has not been annulled, the civil judge can – and must – verify whether what has been built corresponds exactly to what was authorised.

The legal basis invoked is Article 1240 of the Civil Code (which obliges compensation for damage caused by one's fault), combined with planning rules. The Court considers that the appeal court disregarded the provisions of Article 455 of the Code of Civil Procedure (which requires judges to address all parties' arguments). Indeed, Mr. Dubois argued that the works did not comply with the permit; the appeal court did not examine this argument, merely stating that the permit was valid. Error of law.

This reasoning marks an evolution. Previously, some tribunals hesitated to encroach on the administration's domain. Now, the boundary is clear: the administrative judge controls the legality of the act (the permit), the civil judge controls the reality of the works. If you build something different from what is authorised, you can be ordered to demolish, permit or not.

What This Means for You – Practically

But what exactly does this change in your life as a property owner, tenant, or professional? Let's take concrete examples, rooted in the jurisdiction of Mont-de-Marsan.

If you are a landlord in Capbreton and you are building a rental property, this decision directly concerns you. Imagine: you have a permit for an 8-metre-high building, but on site, the contractor exceeds and reaches 9 metres. A neighbour complains about loss of sunlight. Before 2016, you could have argued that your permit was valid. Now, the neighbour can seize the judicial tribunal and request demolition of the excess part. The judge will verify conformity. If the excess is proven, you risk a heavy conviction: not only demolition (average cost: €15,000 to €30,000 for an overheight), but also damages for neighbourhood disturbance. undefined, I have encountered cases where such deviations, even minor, led to proceedings lasting several years.

If you are a tenant, this decision can also impact you. You move into a new home in Tarnos, and discover that the construction encroaches on an easement (for example, a flood zone). The neighbouring owner initiates an action for demolition. Even if your lease is ongoing, legal uncertainty weighs: the building could be demolished, forcing you to leave hastily. Always verify, before signing a lease, that the property complies with the rules.

If you are a purchaser, beware: when buying a new property, demand a certificate of conformity of the works with the permit. Otherwise, you might inherit a costly dispute. For co-owners, this also applies: non-compliant common works can lead to legal actions against the entire co-ownership.

In short, this decision strengthens legal security for neighbours, but increases risks for builders. It reminds us that the permit is not a blank cheque: you must build exactly what is authorised, point by point.

Four Tips to Avoid This Type of Dispute

• Scrupulously verify site/permit conformity: From the start of works, and at each stage, compare the permit plans with the site reality. Use a surveyor if necessary, especially for boundaries and heights. A 20 cm difference can change everything.
• Obtain a certificate of conformity at the end of works: Once works are completed, have a professional (architect, surveyor) certify that everything is compliant. This certificate can protect you in case of later challenge.
• Check easements before building: Inquire at the town hall or with a notary about public utility easements (such as pre-emption zones, alignments) that apply to your plot. In Capbreton, for example, coastal zones are highly regulated.
• Document all exchanges with the administration and neighbours: If you modify a project detail, obtain an amendment to the permit or written agreement from affected neighbours. A mere oral agreement is insufficient before a judge.

Deep Dive: Related Case Law and Evolutions

This decision fits into a broader jurisprudential trend. Before 2016, the Court of Cassation had already evolved, for example in a judgment of 7 April 2011 (No. 10-10.305), where it began to recognise the civil judge's competence to verify conformity, but more timidly. The 2016 judgment consolidates this orientation.

A prior divergent decision, like that of the Bordeaux Court of Appeal in 2013, showed reluctance to encroach on the administrative domain. Now, the line is clear: civil judges must settle these disputes without hiding behind the permit's validity. What few people know is that this evolution responds to a practical need: to speed up the resolution of neighbourhood conflicts, without waiting for a possible administrative annulment that can take years.

For the future, this means increased judicialisation of planning disputes. The tribunals of Mont-de-Marsan already see an increase in cases where owners challenge the conformity of neighbouring constructions. The trend is towards stricter control, with particular attention to easements and environmental rules, increasingly present in PLUs.

What You Must Absolutely Remember

Here is a numbered checklist to summarise the essentials:

1. The building permit is not an immunity: Even if valid, it does not protect against an action for demolition if the works are not compliant.
2. The civil judge can verify everything: Seized by a neighbour, he examines the conformity of the works with the permit, independently of any administrative annulment.
3. Easements and planning rules are crucial: Non-compliance with a public utility easement or the PLU can justify demolition.
4. Act preventively: Verify conformity during and after works, and document everything.
5. In case of dispute, consult quickly: A specialised solicitor can help you negotiate or defend your rights before the situation escalates.

How to react if you are in this situation? Don't panic, but act quickly. An amicable expert assessment can sometimes resolve the conflict without going to court.

Do you find yourself in a similar situation? A first 30-minute consultation with Maître Zakine (€45) can save you months of proceedings – and often much more. Book an appointment →