Subsiding Party Wall: Who Pays for Repairs? The Court of Cassation Answers

Imagine: you own a house in Chambéry, in the Centre district. Your neighbour undertakes excavation works on his land. A few weeks later, you notice that the party wall separating your two properties has subsided, with cracks appearing. Who bears the cost of repairs? The question seems simple, but it can poison neighbourly relations and cost thousands of euros.

In principle, the maintenance of a party wall is shared between the co-owners (owners of the wall). But what happens if the subsidence is due to the fault of one of them? This is precisely what the Court of Cassation decided in a judgment of 23 January 1991 (No. 89-16.867).

In this article, I will explain this case law clearly and concretely, with examples from my practice as a lawyer in Lyon. You will know exactly how to react if you are faced with a similar situation.

The Facts: A Story That Happens Every Day

Mr and Mrs Y., owners in Nîmes, undertook works on their land. These works exerted pressure on the party wall separating them from their neighbours, Mr and Mrs X. Result: the wall subsided. The X spouses then sued their neighbours to obtain restoration of the wall and payment of damages (compensation for the loss suffered).

The Nîmes Court of Appeal, in a judgment of 20 April 1989, ruled in favour of the X spouses: it ordered Mr and Mrs Y. to restore the wall. The latter appealed to the Court of Cassation (an appeal against a court decision). Their argument? Article 655 of the Civil Code provides that repairs to a party wall are to be borne by all those entitled to it, in proportion to their right. In other words, according to them, the costs had to be shared.

But the Court of Cassation did not follow this reasoning. It upheld the appeal judgment, holding that the subsidence of the wall was due to the pressure exerted by the works of Mr and Mrs Y. Therefore, they alone must bear the cost of repairs, because the damage was caused by their act.

The Reasoning of the Court — Deconstructed

The legal basis of this decision is Article 1240 of the Civil Code (formerly 1382), which provides: "Any act whatever of man which causes damage to another obliges the person by whose fault it occurred to repair it." In other words, if you cause damage by your fault, you must repair it in full.

The judges applied this principle to party wall ownership (common ownership of a wall). Admittedly, Article 655 of the Civil Code provides for a sharing of maintenance and reconstruction costs. But this sharing does not apply when the damage arises from the fault of only one of the co-owners. In short, the general rule of Bail commercial : l'engagement solidaire des copreneurs ne survit pas à la résiliation">civil liability (Article 1240) prevails over the special rule of party walls.

The magistrates (judges) therefore rejected the argument of the Y spouses. They considered that the Court of Appeal had sufficiently characterised the causal link between the works and the subsidence. This is not a new rule, but a classic application of liability law. However, be careful: you must prove that the damage is indeed due to the neighbour's fault. What few people know is that this proof can be difficult to provide without an expert report (technical examination by an expert).

This decision is part of consistent case law: the Court of Cassation protects the non-faulty co-owner. It imposes on the person who creates the disorder the sole responsibility for its consequences.

What This Means for You — Practically

This case law has practical implications for all owners, whether they are occupiers or landlords (owners who let).

If you own a party wall and your neighbour damages that wall through works, you can require him to bear the entire cost of repairs. For example, in Lyon, in the Croix-Rousse district, works to raise a neighbour's house caused cracks in a party wall. The neighbouring owner had to pay €8,000 for repairs, without any contribution from the claimant.

If you are the neighbour who caused the damage, you cannot hide behind the sharing of costs. You will have to bear the full cost of repairs, which can range from a few hundred to several thousand euros depending on the extent of the damage.

Tenants are generally not directly concerned, but they must inform their landlord of any damage observed, because it is up to the owner to assert his rights.

Purchasers of a property must check the condition of the party wall before purchase. If recent works have been carried out, it is necessary to ensure that the seller has not caused damage to the party wall, otherwise they may have to repair it after the sale.

However, be careful: if the repair works are urgent (risk of collapse), you can carry them out yourself and then claim reimbursement from the faulty neighbour. But it is prudent to put him on notice (formally request) beforehand, by registered letter.

Four Tips to Avoid This Type of Dispute

• Before carrying out works near a party wall, have a joint inventory of condition (bailiff's report) carried out with your neighbour. This allows you to prove the initial state of the wall and avoid later disputes.
• If you notice subsidence, take photos and videos from the first signs. Document the evolution of the damage. Gather repair quotes.
• Inform your neighbour in writing (registered letter with acknowledgement of receipt) as soon as the disorders appear. Propose an amicable meeting. Most disputes are settled amicably if communication is open.
• Consult a lawyer specialising in property law before initiating legal proceedings. A well-drafted formal notice may be enough to make a recalcitrant neighbour give in. An amicable expert report can also be arranged.

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

Further Reading: Related Case Law and Developments

The 1991 solution is not isolated. In a judgment of 14 January 1987 (No. 85-16.450), the Court of Cassation had already held that an owner who digs an excavation on his land must repair the damage caused to the party wall, even if he has complied with distance rules. Liability is based on Article 1240.

More recently, in a judgment of 22 June 2022 (No. 21-14.568), the High Court recalled that an owner who carries out works on a party wall without the neighbour's consent incurs liability, even if the wall is not damaged. The mere violation of another's property right is sufficient.

The trend of the courts is therefore clear: the protection of the non-faulty co-owner is reinforced. Judges do not hesitate to order the faulty neighbour to pay full repairs, or even damages for disturbance of enjoyment (nuisance suffered). For the future, we can expect this case law to continue, as it is consistent with the general principle of civil liability.

Key Points to Remember

1. Who pays for repairs to a party wall subsided due to a neighbour's fault? The faulty neighbour alone, no sharing.
2. What is the legal basis? Article 1240 of the Civil Code (liability for fault).
3. What should I do if I am a victim? Gather evidence, put the neighbour on notice, consult a lawyer.
4. Can I repair myself and get reimbursed? Yes, if urgency justifies it, but preferably after a prior formal notice.
5. Is there a time limit to act? Yes, the limitation period (time limit to bring a claim) is 5 years from the manifestation of the damage (Article 2224 of the Civil Code).

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