Judicial Boundary Demarcation: Who Pays for the Boundary Markers? The Court of Cassation Rules

Imagine yourself in Dax, owner of a beautiful house with a garden. You always believed your land extended to that laurel hedge. Your neighbour, however, is convinced the boundary runs three metres closer to your terrace. Discussions become heated, relations tense. You end up applying to the court for a boundary demarcation (official delimitation of plots). The judge appoints an expert, who traces the boundary and proposes installing boundary markers. But who should pay for these markers? You? Your neighbour? Both?

This seemingly technical question can inflame neighbourly relations and seriously burden a budget. undefined in Mont-de-Marsan, I have seen cases where the mere cost of the markers – a few hundred euros – reignited conflicts thought to be settled. Yet, the answer was not so clear until now.

The Court of Cassation, in a ruling of 27 March 2025, has provided essential clarification. It specifies under what conditions the costs of purchasing and installing boundary markers fall under legal costs (procedural expenses). This decision, which directly concerns all property owners, tenants, and real estate professionals, deserves attention. But what exactly does it change for you?

The Facts: A Story as Common as Any

The story begins like so many others. Mr K, owner of a plot at [Address K], and his neighbour, owner of the adjacent plot at [Address 13], disagreed on the boundary separating their properties. To avoid conflict, they attempted an amicable boundary demarcation (friendly delimitation) on 19 December 2000. But doubts persisted. As years passed, tensions rose. Who had the right to plant that tree? Where exactly did maintenance responsibility end?

Finally, one of the owners applied to the court to obtain a judicial boundary demarcation (delimitation ordered by a court). The judge appointed a surveyor-expert with a precise mission: determine the separating boundary and, crucially, mark the plots according to this boundary. The expert did his work, traced the line, and naturally proposed installing physical markers to materialise this border on the ground. That's where the problem arose.

Mr K contested having to bear the costs of purchasing and installing these markers. He argued that, traditionally, boundary demarcation – even judicial – is done at shared expense. In other words, each pays half. But was it that simple? The court of appeal, seized of the case, adopted different reasoning. It considered that since the expert's mission explicitly included boundary marking, these costs should be included in the legal costs of the procedure. Mr K, dissatisfied, lodged an appeal to the Court of Cassation. The judicial twist was underway.

The Court's Reasoning – Analysed

The Court of Cassation examined the case carefully. Its reasoning rests on a subtle but fundamental distinction. On one hand, there is the general principle: boundary demarcation, whether amicable or judicial, is normally carried out at shared expense. It is a rule of common sense, stemming from custom and case law, aimed at fairly sharing the burden between neighbours.

But on the other hand, there is the judicial procedure and its specific rules. Article 695 of the Code of Civil Procedure (which lists costs considered as legal costs) is central here. The high court held that when the judge, in their decision, appoints an expert and entrusts them with a mission that explicitly includes marking the plots according to the boundary they have determined, then the costs related to this mission – including the purchase and installation of markers – fall under legal costs.

In short, the Court of Cassation made a distinction between the general principle of sharing costs and the situation where the judge integrates boundary marking into the expert's mission. In this second case, these costs become an integral part of legal expenses, subject to the rules of taxation and coverage provided by the Code of Civil Procedure. The court therefore dismissed Mr K's appeal, confirming the court of appeal's decision.

What few people know is that this decision fits into a logic of procedural coherence. If the judge orders a boundary demarcation, it is logical that the costs necessary for its complete execution are treated as procedural expenses. However, be careful: this does not mean that all boundary demarcation costs are automatically legal costs. It all depends on the wording of the mission entrusted to the expert.

What This Changes for You – Practically

If you own a house in Tarnos and become involved in a judicial boundary demarcation procedure, this decision has very practical implications. First, for the landlord: if you rent out a property and a boundary dispute arises with the neighbour, know that the costs of markers could be considered legal costs if the judge includes them in the expert's mission. This can influence your negotiation or procedural strategy.

For the tenant, the situation is different. In principle, boundary issues fall to the owner. But if you are indirectly affected (e.g., if the dispute blocks works), it is useful to understand these mechanisms. For the purchaser, this decision is crucial. Before buying land in Mont-de-Marsan or nearby, always check the state of boundaries. An uncertain boundary demarcation can generate unexpected costs. undefined, I have encountered cases where the absence of clear markers caused an owner to lose several square metres, with a significant discount on resale.

Practically, the costs of purchasing and installing boundary markers vary. Expect between 150 and 400 euros per marker, depending on the type (stone, concrete, metal) and access conditions to the land. If the judge includes these costs in the legal costs, they will be allocated according to procedural rules, often based on the success or failure of the parties. If you are in this situation, you must be particularly attentive to the drafting of the expert's mission requested from the court.

Four Tips to Avoid This Type of Dispute

• Have an amicable boundary demarcation carried out upon acquisition: before buying land, especially in rural areas around Dax, commission a surveyor-expert for an amicable boundary demarcation. It is an investment (around 800 to 1,500 €) that can save you much more costly procedures.
• Keep all documents carefully: notarial deeds, plans, old photos, exchanges with neighbours. In a dispute, a 30-year-old plan can make the difference.
• Always prioritise discussion with your neighbour: before applying to the court, attempt mediation or conciliation. Mediation centres near Mont-de-Marsan can help you find common ground at lower cost.
• If you must go to court, be precise in your requests: when applying to the court for a boundary demarcation, specify whether you want the expert's mission to include the installation of markers. This will influence cost allocation.

Deep Dive: Related Case Law and Developments

This Court of Cassation decision fits into relatively stable case law. Already, in a ruling of 7 July 2010 (No. 09-13.891), the high court had held that the costs of boundary demarcation proper (surveyor's fees) could be included in legal costs when the judicial mission provided for it. The 2025 ruling extends this logic to the material costs of purchasing and installing markers.

However, there are divergent decisions on ancillary points. For example, some courts have considered that if markers are installed after the judicial decision, on the initiative of one party alone, the costs are not legal costs. The current trend in courts, particularly in the jurisdiction of Mont-de-Marsan, is to favour a pragmatic approach: if boundary demarcation is ordered by the judge, everything necessary for its effective realisation tends to be integrated into the sphere of legal costs.

For the future, this decision clarifies the legal landscape. It encourages parties and their lawyers to be very precise in drafting requests and expert missions. How to react? By anticipating these questions from the outset of the dispute.

Checklist Before Acting

1. Check the state of your property boundaries: do you have visible markers? Documents mentioning them?
2. In case of doubt, consult a surveyor-expert: their assessment can prevent a conflict.
3. If a dispute arises, first attempt an amicable solution: mediation, conciliation, or a simple written agreement.
4. If you must apply to the court, specify your expectations: do you explicitly request the installation of markers in the expert's mission?
5. Anticipate costs: budget for expert fees and, if applicable, for the markers themselves.

Find yourself in a similar situation? A first 30-minute consultation with Maître Zakine (45€) can save you months of procedure – and often much more. Book an appointment →