Party Wall and Chimneys: Who Pays for Works After a Raising?

Imagine the scene: you own a flat in Menton, with a beautiful sea view. One morning, your neighbour starts to raise the wall separating your two properties. So far, nothing unusual. But after the works, your chimneys no longer draw, smoke backs into your living room. Who must pay for the restoration? This question is asked by hundreds of owners each year, often without knowing the answer.

Article 658 of the Civil Code (which governs party walls, i.e., shared ownership of a wall) provides that the co-owner who raises the party wall must reimburse the neighbour all expenses rendered necessary by the raising. But what does this notion cover? The Court of Cassation, in a judgment of 9 October 1985, ruled: as soon as there is a causal link between the raising and the malfunctioning of the chimneys, the neighbour can claim the cost of raising them.

This decision, handed down nearly forty years ago, remains highly relevant today. Whether you are a landlord in Saint-Laurent-du-Var, a buyer of a co-ownership property in Nice, or a private individual, understanding this principle can save you from costly litigation. Let's delve into the details.

The Facts: A Story That Happens Every Day

Mr X owns a building in Menton. His neighbour, Mr Y, decides to raise the party wall separating their properties. The works are entrusted to a contractor. But once the wall is raised, the chimneys of Mr X's building no longer function properly: the draught is insufficient, smoke comes back inside. Mr X then has to raise his own chimneys to restore normal draught.

Mr X considers these works are a direct consequence of Mr Y's raising of the wall. He therefore asks Mr Y to reimburse the costs incurred. Mr Y refuses, arguing that Article 658 of the Civil Code only provides for reimbursement of expenses rendered necessary by the raising, and that raising the chimneys would be mere comfort, not a necessity. The dispute is taken to court, then to the court of appeal. The court of appeal rules in favour of Mr Y, considering that the works contract entered into by Mr X included the raising of the chimneys, which in its view proves that these works were planned independently of the raising.

Mr X appeals to the Court of Cassation. The Court of Cassation quashes the judgment of the court of appeal, on the ground that it violated Article 658 of the Civil Code. The High Court recalls that this text allows claiming all expenses rendered necessary by the raising, as long as there is a cause-and-effect relationship. It does not matter whether the works were planned or not: only the causal link counts.

The Reasoning of the Court — Analysed

The Court of Cassation relies on a literal interpretation of Article 658 of the Civil Code. This text provides: "The co-owner wishing to raise the party wall must reimburse the neighbouring owner all expenses rendered necessary by the raising." In other words, if the raising of the wall forces the neighbour to carry out works that he would not otherwise have had to do, he must be fully reimbursed.

In this case, the issue was whether the raising of the chimneys was rendered necessary by the raising. The court of appeal had found that it was not, based on the fact that Mr X had signed a works contract including this raising even before the completion of Mr Y's works. For the trial judges, this showed that Mr X had voluntarily decided to raise his chimneys, independently of the raising.

The Court of Cassation dismisses this analysis. It states that it suffices to establish a material causal link: the raising of the wall caused poor draught, which made the raising of the chimneys necessary. It does not matter that Mr X anticipated the works or ordered them before the end of the raising: the determining cause remains the raising. This reasoning is consistent with the purpose of the text, which is to protect the neighbour suffering the consequences of a unilateral act.

What few people know is that the Court of Cassation here adopts a broad conception of necessity. It is not about vital works (like repairing a water leak), but works objectively indispensable to restore the previous situation. In short, if the raising disrupts the functioning of an element of your property (chimney, drainage, lighting), the neighbour must pay.

What This Changes for You — Practically

This decision has immediate practical implications for several profiles.

For the owner who raises: you must anticipate the consequences of your works. If your raising risks affecting the neighbour's chimneys, windows, or drains, know that you will have to bear the cost of corrective works. undefined, I have come across cases where an owner in Saint-Laurent-du-Var had to pay €8,000 for the raising of chimneys at his neighbour's, simply because he had raised a wall by 50 cm.

For the neighbouring owner: if you suffer damage, do not hesitate to have the causal link established by an expert (e.g., an architect or a consultancy firm). Keep quotes and invoices. You can claim not only the cost of works, but also any expert fees and relocation costs if necessary.

For the tenant: you are not directly concerned by the dispute between owners. But if your chimney no longer works, inform your landlord in writing (registered letter). It is up to him to take action against the neighbour. You can also ask for a rent reduction if the disturbance is serious.

For the buyer: before buying a property, check whether any raising works have taken place recently. Ask the seller about the condition of the chimneys. A draught defect may reveal a latent conflict.

Note, however: Article 658 only applies to party walls. If the wall is privately owned, different rules apply. Moreover, the limitation period (time to act) is five years from knowledge of the damage. Do not delay.

Four Tips to Avoid This Type of Dispute

• Before raising a party wall, inform your neighbour in writing. Send a registered letter with acknowledgement of receipt detailing the planned works. Offer a meeting on site. Transparency defuses many conflicts.
• Have a joint inventory of condition carried out before works. Take photos, call a bailiff if necessary. This will allow proving the initial state of chimneys, windows, etc.
• If you are the neighbour, do not delay in reporting problems. As soon as you notice an issue (smoke, insufficient draught), write to your neighbour by registered post. Have a bailiff's report drawn up quickly.
• In case of dispute, prefer mediation before litigation. The cost of court proceedings can be very high (several thousand euros). Mediation, even if paid, is often cheaper and faster.

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Further Analysis: Related Case Law and Developments

The 1985 solution fits into a consistent trend of the Court of Cassation to interpret Article 658 broadly. Thus, in a judgment of 12 March 1974 (No. 73-10.456), the Court had already held that necessary expenses include not only the raising, but also consolidation works on the existing wall. More recently, in a judgment of 6 January 2021 (No. 19-22.001), the Court clarified that reimbursement also covers amicable expert fees.

This case law shows that judges are sensitive to protecting the neighbour suffering damage. However, there are limits: if the neighbour himself has abnormally modified his installations (e.g., by installing a non-compliant chimney), the causal link may be broken.

For the future, one can expect the notion of necessary expenses to extend to non-material damages (loss of enjoyment) and additional energy costs. Courts follow the evolution of standards (energy performance, accessibility).

In Practice: What to Do

1. I have raised my party wall and my neighbour is asking me to pay for the raising of his chimneys. What should I do?
First, verify the causal link: request a bailiff's report or an expert opinion. If the link is established, you must pay. Try an amicable agreement. If you contest, you can take the matter to the judicial court, but the chances of success are low given the case law.

2. My neighbour has raised the party wall and since then my chimney no longer draws. Can I force him to pay?
Yes, on the basis of Article 658. Send him a formal notice with a quote. If he refuses, take the matter to court. You can also request an interim payment (provision) in summary proceedings.

3. What are the time limits for taking action?
The action is subject to a 5-year limitation period from the day you knew of the damage (Article 2224 of the Civil Code). For continuous disturbances, the period runs from the cessation of the disturbance.

4. The wall is not party, but privately owned. What should I do?
If the wall is privately owned, Article 658 does not apply. You will need to invoke the theory of abnormal neighbourhood disturbances (Article 1240 of the Civil Code) or an easement (right of way, etc.). Consult a lawyer to identify the appropriate basis.

5. Can I obtain damages in addition to reimbursement of works?
Yes, if you can prove a separate loss (loss of enjoyment, loss of rent). For example, if your tenant left the premises because of the defective chimneys, you can claim the loss of rent.

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 →