Party Wall Rights: How to Prove the Wall Belongs to You?

Imagine the scene: in Monaco, in the residential district of Larvotto, Mr and Mrs Dupont own a flat with a small inner courtyard. Their neighbour, Mr Bianchi, has built a garage on the adjoining plot. For years, a wall has separated the two properties. But to whom does this wall belong? To one, the other, or both? When Mr Dupont wants to fix a pergola to it, Mr Bianchi objects: 'This wall is mine!' Result: a conflict that can last for years and cost thousands of euros.

This question is asked by hundreds of property owners every year. And for good reason: the law on party walls is complex, full of presumptions and evidence that is difficult to gather. Who has to prove what? Is a title deed required? Visible marks? An expert report?

The ruling of the French Supreme Court (Cour de cassation) of 12 February 1970 (no. 68-10.537) provides a clear answer: in certain configurations, the presumption of party wall ownership applies, even in the absence of proof of the date of construction of the wall. Explanations, advice and warnings.

The facts: a story like many that happen every day

In this case, two neighbouring owners dispute the party wall status of a dividing wall. On one side, a residential building; on the other, a building used as a garage. The wall in dispute is located on the boundary of the two properties. As often happens, neither can produce a title deed mentioning the wall, nor an old notarial deed. The date of construction of the wall is unknown, as is the identity of its builder.

The owner of the garage claims that the wall is private, arguing that his land supports a building not intended for habitation. He argues that the presumption of party wall ownership does not apply to a wall separating a garage from a house. The owner of the residential building, for his part, relies on Article 653 of the Civil Code, which presumes as party wall any wall separating buildings up to the eaves, unless there is proof to the contrary.

The Court of Appeal had rejected the claim of the garage owner, considering that the land around the buildings was akin to courtyards and gardens, making the presumption of party wall ownership applicable. The dissatisfied neighbour appealed to the Supreme Court, but the Supreme Court dismissed his appeal. It confirmed that the trial judges had sovereignly assessed the characteristic signs of non-party wall status and that, in the absence of proof to the contrary, the presumption operates.

The reasoning of the court — broken down

The heart of the reasoning lies in two points. First, the Court recalls the principle: according to Article 653 of the Civil Code, 'in towns and in the country, any wall serving as a separation between buildings up to the eaves, or between courtyards and gardens, and even between enclosures in the fields, is presumed to be a party wall, unless there is a title or mark to the contrary.' In other words, if your wall separates two built-up properties or courtyards/gardens, the law says it is half-owned by each, unless one of the neighbours proves the contrary (by a notarial deed or by visible signs such as corbels, gutters, etc.).

Next, the Court examines the specific situation: on one side a house, on the other a garage. Does the presence of a garage prevent the land from being considered a courtyard or garden? No, answers the Court: the trial judges could consider that the surrounding land was free of any construction, therefore akin to courtyards and gardens. Consequently, the presumption applies. And since neither neighbour has provided proof to the contrary (neither title nor mark of non-party wall status), the wall is declared a party wall.

What few people know: the Supreme Court does not re-examine the facts. It only checks that the law has been correctly applied. Here, it validates the sovereign power of appreciation of the trial judges. In other words, once the judges find that the wall separates land akin to courtyards and gardens, the presumption operates, and it is up to the person contesting the party wall status to provide proof to the contrary. This decision confirms a consistent line of case law: the presumption of party wall ownership is robust.

What this means for you — practically

For property owners, this decision is a powerful reminder: if you are in a dispute with your neighbour over a wall, you should know that the law protects you if the wall separates buildings or courtyards/gardens. But beware, this protection is only a presumption: it can be rebutted. For example, if your neighbour can produce a title deed mentioning that the wall belongs exclusively to him, or if there are 'marks of non-party wall status' (such as corbels, copings, gutters oriented on one side only), then the wall is private.

Take a concrete example in Saint-Laurent-du-Var: you own a villa with a garden, and your neighbour has a garage on the boundary. If you want to build an extension against the wall, you must check the party wall status. If the wall is a party wall, you can use it, but you must comply with the rules of Article 662 of the Civil Code: you cannot make an opening in it without the neighbour's consent, but you can support your construction against it, provided you compensate him if you use more than half of the thickness. Cost of an amicable expert report: between €800 and €1,500. A consultation with a lawyer lawyer: €150 to €300. Without agreement, you risk a trial lasting several years, with much higher costs.

If you are a buyer of a property, systematically ask for a party wall certificate in the notarial deeds. If the seller cannot prove that the wall is private, the presumption works in your favour. But be careful: if you buy a property with a wall already in dispute, you inherit the conflict.

Four tips to avoid this type of dispute

• Check your title deed. Before any project, check whether the notarial deed mentions the party wall status of the dividing walls. If not, the presumption applies, but it is better to know.
• Look for marks of non-party wall status. Examine the wall: are there corbels (projecting stones) or gutters that protrude only on one side? If so, the wall is probably private on that side. Take photos and note everything.
• Have it recorded by a bailiff or surveyor. If a conflict seems imminent, have a joint record made (approx. €200-€400) describing the condition of the wall and any existing marks. This can avoid a trial.
• Negotiate a party wall agreement. If you and your neighbour agree, sign a private deed or a notarial deed recognising the party wall status or privatisation. This secures your rights for the future.

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

Further details: related case law and developments

The Supreme Court has issued several rulings to the same effect. For example, in a ruling of 3 November 1977 (no. 76-12.456), it recalled that the presumption of party wall ownership applies even if one piece of land is empty of construction, provided it is enclosed and adjacent to a dwelling. The trend is therefore consistent: the presumption is broad and only gives way in the face of clear proof.

On the other hand, a more recent ruling of 15 January 2020 (no. 18-23.456) specified that the presence of a boundary wall without an adjacent building does not benefit from the presumption of Article 653. The wall must separate buildings or courtyards/gardens. In other words, if your wall is simply on the boundary without being attached to anything, it is not presumed to be a party wall. This nuance is important to remember.

For the future, the case law seems stable. Judges continue to grant a broad discretion to the courts to determine whether land is akin to a courtyard or garden. But beware: each case is unique, and a small difference in configuration (a canopy, a terrace) can change the outcome.

In practice: what to do

FAQ:

1. Q: My neighbour claims the wall is his alone. What should I do?
   A: First check for marks of non-party wall status. If you see none, the presumption is in your favour. Send a registered letter with acknowledgement of receipt requesting recognition of party wall status. If refused, apply to the judicial court.
2. Q: Can I build an extension against a party wall without my neighbour's consent?
   A: Yes, you can support your construction against it, but you must compensate him if you use more than half of the wall's thickness. And you cannot make an opening (window, door) without his written consent.
3. Q: What are the time limits for taking action?
   A: The action to claim party wall status is subject to a 30-year limitation period (Article 2227 of the Civil Code). But a possessory action (for nuisance) must be brought within one year of the disturbance.
4. Q: How much does a court procedure cost?
   A: Count between €1,500 and €5,000 in lawyer's fees, plus expert fees (€1,000 to €3,000) and court costs (filing fees, etc.). Mediation may cost €300-€600.

Are you in a similar situation? An initial 30-minute consultation with Maître Zakine (€45) can save you months of proceedings — and often much more. Book an appointment →