Abnormal Neighbourhood Disturbance: When 2004 Backfilling Engages Your Liability in 2017

Imagine the scene: in Doullens, you have just bought a house with a beautiful garden. Your neighbour, delighted to welcome you, undertakes backfilling work to level his land. Five years later, cracks appear on your boundary wall. Who pays? Your insurer? His? The question that troubles every owner: when does liability begin?

This decision of the Court of Cassation of 12 October 2017 (No. 16-19.657) provides a precise answer to this question. It reminds that the harmful event – that is, the event that triggers the insurance cover – is the cause of the damage, not the date on which you discover the damage. A crucial point that can turn a case around.

In the case judged, Mr and Mrs A... saw their boundary wall crack after backfilling work carried out in 2004 by their neighbour, Mrs Z... The disorders were noted in October 2008. The Paris Court of Appeal had held that the date of appearance of the cracks (2008) was the harmful event. The Court of Cassation quashed this reasoning: the causative event is the backfilling of 2004. Why is this distinction crucial? The limitation period and the insurance cover depend directly on it.

The facts: a story that happens every day

Mr and Mrs A... are owners of a house in Doullens, peacefully settled for years. Their neighbour, Mrs Z..., decides in 2004 to carry out backfilling on her land to make it flatter. Nothing exceptional, ordinary gardening work. Except that the consequences are only felt four years later: in October 2008, the A... notice significant cracks on the boundary wall separating the two properties. Worried, they alert their neighbour and commission an expert report.

The expert concludes that the cracks are directly linked to the 2004 backfilling: the pressure exerted by the added earth caused differential settlement, weakening the structure of the wall. Mrs Z... is sued before the court for Troubles anormaux de voisinage">abnormal neighbourhood disturbance – a well-known principle: no one may cause another a disturbance exceeding normal neighbourhood inconveniences (Article 1240 of the Civil Code).

The Paris High Court orders Mrs Z... to compensate the damage. But a twist occurs: Mrs Z... calls upon her insurer for cover, as she had taken out civil liability insurance. The insurer refuses, arguing that the harmful event (the backfilling) dates from 2004, more than two years before the claim declaration in 2008, and that the two-year limitation period under Article L. 114-1 of the Insurance Code has expired. The Paris Court of Appeal, in its judgment of 24 February 2016, upholds the insurer on the basis that the appearance of the disorders in 2008 constitutes the harmful event. The A... and Mrs Z... appeal to the Court of Cassation.

The reasoning of the court — analysed

The Court of Cassation quashes the appeal judgment. Its reasoning is simple but decisive: the harmful event, within the meaning of Articles L. 124-1-1 and L. 124-5 of the Insurance Code, is the generating cause of the damage, not the date of its manifestation. In other words, it is not when the crack appears that matters, but what caused it.

Specifically, Article L. 124-1-1 of the Insurance Code defines the harmful event as the generating event of the damage. Article L. 124-5 deals with the limitation period for the direct action of the victim against the insurer. By linking the two, the Court reminds that the insurer cannot rely on the two-year limitation period if the generating event (here the backfilling) is prior to the manifestation of the damage, provided that the victim has acted within two years of the manifestation.

This decision is not a departure: it falls within settled case law. The Court had already held, in a judgment of 22 March 2012 (No. 11-13.967), that the starting point of the limitation period for liability actions is the date of the manifestation of the damage. But it clarifies here that, for insurance, the harmful event remains the cause. Why? Because it is at that date that the cover is determined: the insurer who covered the risk in 2004 is liable, even if the damage appears later.

The arguments of the parties were stark: the insurer wanted a fixed date (2004) to escape its cover; the victims and Mrs Z... argued that the damage only arose in 2008. The Court makes a balanced choice: it protects the victim by maintaining the obligation to repair, but it fixes the insurer's liability at the time of the generating event – which is logical to avoid injustices.

What this changes for you — concretely

This decision has immediate practical implications for several profiles:

• Landlord: If you rent out a property and work carried out by your tenant (or a neighbour) causes damage that appears years later, your insurer cannot refuse its cover by relying on the date of the act. For example, in Péronne, a landlord saw his wall collapse six years after earthworks by the neighbour: the insurer had to indemnify.
• Purchaser: When you buy a property, check the history of work done by neighbours. If disorders appear later, know that the starting point of the limitation period is the date of discovery. But beware: the direct action against the neighbour's insurer may be limited if the cover has expired in the meantime.
• Co-owner: In a co-ownership, a construction defect may take years to manifest (cracks, leaks). This case law confirms that the managing agent must act upon discovery of the damage, but that the liability of the company that did the poor work is engaged at the date of the work – hence the importance of keeping contracts.

A quantified example: in Doullens, an owner had to pay €8,000 for wall repair. His insurer refused cover relying on the limitation period. Thanks to this case law, he was able to succeed because the generating event (the backfilling) dated back less than five years. Without this decision, he would have lost.

Four tips to avoid this type of dispute

• Before work on your property or a neighbour's, make a dated photographic record. A bailiff's report (around €150) can avoid years of proceedings. In Doullens, such a report proved that the cracks did not exist before the work.
• Keep all your insurance contracts and endorsements. In the event of a dispute, the applicable cover is that in force on the date of the harmful event. If you change insurer, check that the new policy covers previous work.
• Declare any loss to your insurer as soon as it appears, even if you doubt the cause. The two-year limitation period runs from the manifestation of the damage. Failure to declare may cause you to lose your rights.
• In case of disagreement, take the matter to court within two years of discovery. A late legal action may be declared inadmissible. Consult a specialist lawyer to assess the deadlines.

Further reading: related case law and developments

This decision is part of a consistent line. In a judgment of 22 March 2012 (No. 11-13.967), the Court of Cassation had already held that the starting point of the limitation period for liability actions is the date of manifestation of the damage. Here, it transposes this principle to insurance law by clearly distinguishing the harmful event (cause) and the manifestation (effect).

A more recent judgment of 6 February 2020 (No. 18-25.217) went in the same direction: for damage caused by construction work, the generating event is the date of construction, even if the disorders only appear years later. The trend is therefore towards the protection of victims, but with rigour in determining the cause.

In the future, we can expect insurers to tighten their clauses by requiring immediate declaration of any event likely to cause future damage. Owners will have to be extra vigilant.

In practice: what to do

Checklist: What to do if you discover damage caused by a neighbour

1. Photograph the damage and note the date of discovery.
2. Inform your neighbour by recorded delivery letter with acknowledgement of receipt, describing the facts and requesting an amicable expert report.
3. Declare the loss to your insurer within 5 working days (or as per your contract).
4. Keep all supporting documents: photos, letters, repair estimates.
5. Consult a lawyer if the neighbour refuses to repair or if the insurer relies on the limitation period.

FAQ

• What is abnormal neighbourhood disturbance? It is a disturbance that exceeds ordinary neighbourhood inconveniences (noise, odours, material damage). Article 1240 of the Civil Code allows for compensation.
• Can I act if the damage appeared more than two years after the work? Yes, if you act within two years of discovery. But the neighbour's insurer may refuse cover if the policy has expired.
• What is the deadline to sue? You have 5 years from the manifestation of the damage to bring a civil liability action (Article 2224 of the Civil Code). For insurance, the deadline is 2 years from the loss.
• How much does a judicial expert report cost? Between €800 and €3,000 depending on complexity. It is often ordered by the court and shared between the parties.
• What if the insurer refuses cover? Take the matter to the judicial court within 2 years. A lawyer will help you demonstrate that the generating event is indeed prior to the manifestation.

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 →