Encroachment on the Subsoil: When Industrial Extraction Crosses the Property Boundary

Imagine: you are the owner of a plot of land in Mehun-sur-Yèvre, in the Cher department. One day, you discover that your neighbour, a quarry operator, has dug well beyond the boundary line. He has extracted sand and gravel under your plot, without your consent. What can you do? This type of dispute, more common than one might think, often pits private individuals against industrial operators. The question that haunts every owner: can the operator invoke the thirty-year limitation period to retain the benefit of his intrusion? The answer is no, says the Court of Cassation in a judgment of 11 February 2015 (No. 13-26.023).

This decision clarifies a crucial point: an industrial extraction activity that exceeds the property boundary constitutes an encroachment (unlawful occupation) by appropriation of the subsoil. In other words, removing another's earth amounts to appropriating the vacant volume left behind, which is an abnormal neighbourhood disturbance and a violation of the right of property.

But that is not all: the Court specifies that this action for cessation of encroachment is not subject to the thirty-year limitation period (the 30-year time limit to bring an action). In other words, even if the operation has been ongoing for decades, the aggrieved owner can demand restoration. Analysis of this decision and its practical consequences for owners, operators and real estate professionals.

The facts: a story like any other

Mr X, owner of a plot of land in Aubigny-sur-Nère, saw his plot adjacent to a quarry operated by a company. For years, the company extracted materials, and Mr X realised that the operation had crossed the boundary line, digging under his land. Furious, he sued the company to stop the encroachment and obtain damages.

Before the Bourges Tribunal de grande instance, the company raised the thirty-year limitation period (30-year time limit to bring an action): according to it, the extraction had been ongoing for more than 30 years, so Mr X could no longer demand restoration. It also contested the abnormal nature of the neighbourhood disturbance, arguing that the operation was authorised and compliant with the rules.

The Tribunal ruled in favour of Mr X on the encroachment, but rejected his claim for compensation for abnormal neighbourhood disturbance for lack of proof of its abnormal nature. The company appealed, and the Bourges Court of Appeal upheld the judgment. The company then appealed to the Court of Cassation.

The Court of Cassation had to decide two questions: does encroachment by extraction of the subsoil constitute an act of appropriation? And above all, can the limitation period be invoked to avoid restoration?

The reasoning of the court — dissected

The Court of Cassation dismissed the company's appeal. It confirmed that the extraction of materials beyond the boundary line constitutes an encroachment by appropriation of the subsoil. Why? Because the operator appropriated the space left vacant by the extraction. By removing the earth, he physically took possession of the underground volume, which is a violation of the neighbour's right of property.

The legal basis is article 544 of the Civil Code, which defines the right of property as the right to enjoy and dispose of things in the most absolute manner, subject to the laws. But also article 1240 (formerly 1382) which requires compensation for damage caused by one's fault. By digging on another's land, the company committed a fault, and the owner is entitled to have the intrusion stopped.

The Court specifies that the action for cessation of encroachment is imprescriptible: it is not barred by 30 years. Why? Because encroachment is a continuous infringement of the right of property. As long as the extraction continues (or its consequences persist), the owner can act. The limitation period only begins to run if the encroachment ceases and the owner does not react for 30 years. Here, the extraction was still active, so no limitation period.

However, the Court confirmed that the claim for compensation for abnormal neighbourhood disturbance requires proof that the disturbance exceeds the normal inconveniences of neighbourhood. Mr X having not provided this proof, his claim was rejected. This point is important: encroachment is automatically sanctioned, but neighbourhood disturbance requires a heavier burden of proof.

What this changes for you — concretely

For owners: if you discover that a neighbour (individual or company) has dug under your land, you can demand restoration, even if the operation has been ongoing for decades. Do not let the limitation period argument pass. For example, in Aubigny-sur-Nère, an owner whose subsoil has been exploited for 40 years without his consent can still act. You can also claim damages for the value of the materials extracted (often considerable sums: €50,000, €100,000 depending on volume).

For quarry operators: do not rely on the age of the operation. Even after 30 years, you may be forced to backfill and compensate. Always check the limits of your mining title and have regular boundary surveys. A simple mapping error can be very costly.

For buyers: before buying land, inquire about neighbouring extraction activities. An amicable boundary survey is advisable. If a quarry adjoins your future property, demand a warranty from the seller against past encroachments.

For co-owners: if the subsoil of the co-owned property is exploited without authorisation (car parks, cellars, etc.), the syndic can act to stop it. The limitation period does not apply if the occupation is continuous.

Four tips to avoid this type of dispute

• Have your land surveyed: a chartered surveyor precisely delimits the boundaries. Cost: around €1,500 for a standard plot. It is cheaper than a lawsuit.
• Monitor neighbouring activities: if a quarry or construction site sets up nearby, visit your land regularly. Take photos, have bailiff's reports made if necessary.
• Keep your title deeds: the notarial deed mentions the area and boundaries. In case of doubt, it is authoritative. Also check easements and exploitation rights.
• Act quickly at the first suspicion: even if the limitation period is not an obstacle, the longer you wait, the more evidence deteriorates. A bailiff's report costs around €200 and can be decisive.

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

Further reading: related case law and developments

This decision is part of a consistent line: the Court of Cassation firmly protects the right of property against underground encroachments. In a judgment of 7 November 2012 (No. 11-25.027), it had already ruled that the extraction of materials beyond the boundaries constitutes an unlawful appropriation. Here, it confirms and clarifies the imprescriptible nature of the action.

However, for neighbourhood disturbances, case law requires rigorous proof of the abnormal nature. For example, noise nuisance or vibrations may be considered normal in an industrial area. The line is therefore fine. The courts are increasingly demanding regarding expert reports.

In the future, it can be expected that operators will be more vigilant about boundary surveys and authorisations. Owners, for their part, must be proactive. Subsoil law remains a technical area, but this decision provides a powerful weapon for aggrieved owners.

Key points to remember

FAQ

Can I act if the extraction started more than 30 years ago? Yes, as long as the encroachment has not ceased and you have not let 30 years pass after the end of the operation.

What compensation can I obtain? Cessation of the encroachment (backfilling) and damages for the value of the materials extracted and loss of enjoyment.

Do I have to prove the abnormal neighbourhood disturbance? Yes, to obtain additional damages. But for the encroachment itself, simple proof of the intrusion suffices.

How much does a lawsuit cost? Expect €3,000 to €10,000 in lawyer and expert fees, but the stakes are often much higher.

Can I defend myself alone? No, this litigation is technical. A specialised lawyer is essential, especially for limitation period and damage assessment issues.

Are you 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 →