Boundary Determination and the Public Domain: When the Civil Judge Must Verify Public Ownership

Imagine: you own a house in Lens, with a garden adjoining a communal piece of land. For years, you have maintained a hedge which, in your opinion, marks the boundary. But your neighbour claims the hedge encroaches onto the communal plot. The town council says nothing. You then decide to seek a judicial boundary determination to settle the boundary. But here's the issue: does the civil court have jurisdiction when the disputed land may be public? This is precisely the question put to the Court of Cassation in 1992.

This decision, little known to the general public, is nevertheless crucial for any owner facing a neighbourly dispute involving a public plot. In short, the Court of Cassation overturned a Court of Appeal that had ordered a boundary determination without verifying whether the land in question belonged to the communal public domain. Why is this important? Because if a plot is public, the civil judge lacks jurisdiction: only the administrative courts can hear disputes concerning the public domain.

What few people know is that this jurisdictional issue can derail the entire boundary determination. If you start proceedings before the wrong court, you risk wasting time and money. So how do you know if your land is public? And what should you do if the town council claims part of your garden? Let's delve into the details of this case.

The Facts: A Story Like Many Others

In Corneilla-de-Conflent, in the Pyrénées-Orientales, owners, whom we will call Mr and Mrs Poux, own plots of land. Their neighbours, the Y... couple, own an adjacent property. A dispute arises: where is the boundary between their lands? The Poux sue the Y... before the Tribunal de Grande Instance to obtain a judicial boundary determination, i.e., the official determination of the dividing line.

But there is a catch: one of the plots in question may be a communal road, thus part of the public domain. The commune, although informed, gives its consent to the boundary plan proposed by the Poux. But is this consent sufficient for the civil judge to order the boundary determination? The Y... couple raise the exception of public ownership: according to them, the civil court lacks jurisdiction because the dispute concerns public property.

The Tribunal de Grande Instance, and then the Montpellier Court of Appeal, do not share this view. They accept jurisdiction on the grounds that the action for boundary determination does not aim to determine whether the plot forms part of the public domain, but only to fix the boundary between private properties. The appeal judges rely on Article 646 of the Civil Code, which provides that any owner can compel his neighbour to a boundary determination, and on Article 13 of the Law of 16-24 August 1790, which prohibits civil courts from hearing domain matters, but they consider that this prohibition does not apply here.

The Court of Cassation, however, will quash this judgment. It criticises the Court of Appeal for failing to investigate whether one of the plots concerned belonged to the communal public domain. In other words, before declaring itself competent, the civil judge must first verify whether the disputed land is public or private. If it is public, the administrative judge has sole jurisdiction.

The Reasoning of the Court — Analysed

The Court of Cassation relies on the principle of separation of administrative and judicial authorities, derived from the Law of 16-24 August 1790. This text, over two centuries old, essentially provides that civil courts cannot interfere in the functioning of the administration, including the management of the public domain. Determining whether a plot forms part of the public domain falls within the exclusive jurisdiction of the administrative judge.

In this case, the Court of Appeal had accepted jurisdiction by asserting that the action for boundary determination did not seek to rule on public ownership, but only to fix the boundary between private properties. The Court of Cassation corrects this: boundary determination, by its nature, may have the effect of resolving a question of public ownership. If a plot is public, boundary determination is impossible before the civil judge, as the latter has no power to demarcate the public domain.

In other words, the civil judge must, as soon as seized of an action for boundary determination, verify of his own motion whether one of the plots is likely to belong to the public domain. If there is any doubt, he must stay proceedings and refer the question to the administrative court. This is a key point: the judge cannot simply say 'that's not my problem'.

undefined, I have encountered cases in Béthune where owners had initiated a judicial boundary determination without realising that the disputed plot was part of the communal road network. Result: after several months of proceedings, the civil court declared itself incompetent, and everything had to start again before the administrative court. A considerable waste of time and money.

The 1992 decision is therefore a reminder: before going to court, you must clearly identify the nature of the lands. And if the town council is involved, it is better to consult a lawyer specialising in property law to avoid this jurisdictional error.

What This Means for You — Practically

For owners: if you have a boundary dispute with a neighbour and the boundary adjoins a communal plot (a road, a path, a public car park, etc.), you must first ask yourself whether this plot is public. How to find out? Check the cadastral plan, the Local Urban Plan (PLU), or ask the town council. If the plot is public, a classic judicial boundary determination is impossible: you will have to apply to the administrative court.

For tenants: you are not directly concerned, but if your landlord is in dispute with the town council, it may affect your peaceful enjoyment. For example, if a communal path crosses your garden, the town council may require its opening to the public. Be vigilant.

For buyers: before purchasing a property, check that the cadastral boundaries do not overlap a public plot. An amicable boundary determination with the neighbour is preferable, but if the town council is involved, obtain a certificate of public ownership. In Béthune, I saw a case where a buyer had purchased a house with a large garden, but half of the land was actually an unbuilt communal road. He had to return the land to the commune without compensation.

For co-owners: if your unit includes a common part adjoining a public plot, the manager must be vigilant. A poorly executed boundary determination could result in a loss of surface area for the co-ownership.

Note however: this decision only concerns plots in the public domain. If the land is private (even if the commune owns it, but it is private property), the civil judge remains competent. The distinction is subtle but crucial.

Four Tips to Avoid This Type of Dispute

• Consult the cadastre and the PLU before any action for boundary determination. Check whether the disputed plot is classified as a public zone (road, public facility, etc.). In Lens, the town planning department can provide this information free of charge.
• Contact the town council as soon as you suspect public ownership. Request a certificate of public ownership or an attestation regarding the plot's belonging to the public domain. This will save you from a jurisdictional error.
• Prefer an amicable boundary determination with the neighbour, but only if the plot is private. If the commune is involved, an amicable boundary determination is not possible: you must go through the administrative route.
• Consult a lawyer specialising in property law before initiating proceedings. A lawyer will advise you on the competent court and save you unnecessary costs. A 30-minute consultation can save you months of procedure.

Further Reading: Related Case Law and Developments

This 1992 decision is part of consistent case law. Before it, the Court of Cassation had already ruled, in a judgment of 5 February 1975 (No. 73-10.123), that the civil judge cannot order a boundary determination if one of the plots falls within the public domain. Later, in 2006, the Court clarified that even if the commune does not raise the exception of public ownership, the judge must raise it of his own motion (Civ. 3e, 7 June 2006, No. 05-14.987).

The trend is therefore towards reinforced protection of the public domain. Administrative courts are now the sole judges of the boundaries of the public domain, whether for boundary determination, unlawful encroachment, or easements. This means that if you wish to challenge a boundary with a public plot, you must go to the administrative court, with different procedural rules (shorter deadlines, no mandatory representation in some cases, etc.).

For the future, it is likely that this case law will continue, as it is based on a constitutional principle: the separation of administrative and judicial authorities. Legislative reform would be necessary to change the situation, but nothing is on the agenda.

In Practice: What to Do

FAQ:

1. Q: Can I request a judicial boundary determination if my neighbour is the commune? A: Yes, but only before the administrative court. Apply to the territorially competent administrative court (e.g., Lille for the Nord region).
2. Q: What if I have already initiated a boundary determination before the civil court and the commune raises the issue of public ownership? A: The court will likely declare itself incompetent. You will then have to start again before the administrative court. It is better to seek a consultation with a lawyer to avoid this upstream.
3. Q: Can the commune refuse a boundary determination? A: Yes, if it considers the plot to be public. On the other hand, if it is a private owner, it is subject to boundary determination like any individual.
4. Q: What is the cost of a judicial boundary determination? A: Expect between €1,500 and €5,000 for a classic judicial boundary determination (lawyer fees, surveyor, etc.). If you have to apply to the administrative court, costs are similar, but delays may be longer (6 to 18 months).
5. Q: Can I do without a lawyer for a boundary determination before the administrative court? A: Yes, representation is not mandatory before the administrative court for boundary determination disputes. However, it is strongly recommended to be assisted, as the procedure is technical.

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 →