Boundary Survey Refused When Plot Adjoins a Public Highway: The Alignment Order is Determinative

Imagine: you own a house in Meaux, rue du Moulin. Your land adjoins a public highway. One day the town hall announces that it will widen the road, and your fence encroaches on the public domain. You want to have a boundary survey (official delimitation of property boundaries) to challenge this. But surprise: the judge tells you it is not possible because an alignment order (administrative document setting the boundary between private property and the public highway) already exists. How is this possible? This 1973 decision of the French Supreme Court answers that question, which affects thousands of neighbours of public highways.

The question every owner asks: can I insist on a boundary survey if my plot runs along a street? The answer is no, if an alignment order has been made. The latter is binding and prevails over the civil court, which cannot set it aside. In short, a boundary survey is not an absolute right: it gives way to an administrative act that already fixes the boundary with the public highway.

What many do not know is that this rule applies even if the alignment order is old or contested. The civil court has no jurisdiction to assess the validity of an administrative act: only the administrative court can do so. In other words, judicial boundary surveying is blocked as long as the alignment order has not been annulled.

The facts: a story that happens every day

Mr Tronchon, an owner in Meaux, had land adjoining the rue du Moulin. With his commune, there was total confusion: where did his property end? Where did the public highway begin? To settle the matter, Mr Tronchon sued the commune for judicial boundary surveying (a procedure before the court to determine the boundaries of his land). He wanted a decision that would definitively fix the frontier between his property and the street.

But the commune raised a strong argument: an alignment order of 22 June 1962 had already set the boundary of the public highway. For the commune, this administrative act was binding on everyone, and the court could not carry out a boundary survey that would contradict that decision.

The tribunal de grande instance (predecessor of the tribunal judiciaire) followed the commune: it held that a boundary survey was unnecessary because the boundary was already determined by the alignment order. Mr Tronchon appealed. The court of appeal (second instance) affirmed. He then lodged an appeal in cassation (a remedy before the French Supreme Court to check whether the law has been correctly applied).

Before the French Supreme Court, Mr Tronchon argued that the civil court should rule on the boundary survey because it is a personal action that does not affect public domain status (the quality of property belonging to the State or local authorities). But the French Supreme Court dismissed his appeal: by referring to an alignment order without deciding a serious dispute as to public domain status, the court of appeal had not exceeded its powers.

The court's reasoning — dissected

The basis of this decision is Article 646 of the Civil Code, which provides that "any owner may compel his neighbour to a boundary survey of their adjoining properties." This is a fundamental right for every owner. But beware: this right is not absolute. It gives way when the boundary is already fixed by an administrative act such as an alignment order.

What exactly does the judgment say? The French Supreme Court validates the reasoning of the court of appeal: the latter simply noted that Mr Tronchon's plot adjoined the public highway, and that the boundary was fixed by an alignment order. It did not have to rule on public domain status (whether the highway was public property or not) because the alignment order is an act that is binding on the civil court. In other words, the civil court cannot redo what the administration has already done.

But what does this actually change? Before this decision, some courts could order a boundary survey even in the presence of an alignment order, on the ground that a boundary survey is an owner's right. The French Supreme Court put an end to this uncertainty: if the alignment exists, a boundary survey is no longer necessary. The civil court need only check that the alignment order is indeed applicable, without discussing its merits.

What few people know is that this position has been consistent since 1973. It has been reaffirmed in several later decisions. In short, the case law is now well established: an owner whose property adjoins a public highway cannot obtain a judicial boundary survey if an alignment order fixes the boundary. He must challenge the order before the administrative court, if he believes it is unlawful.

What this means for you — in practice

For a landlord: if you rent out a property that adjoins a public highway, and the town hall issues an alignment order that reduces your land, you cannot ask for a boundary survey to challenge that boundary. You must attack the order before the administrative court, within two months of its publication. Example: in Meaux, if the town hall widens the rue du Moulin and your building ends up with a smaller courtyard, you cannot turn back the clock by a civil boundary survey.

For a purchaser: before buying land bordering a road, check whether an alignment order exists. If so, the boundary is fixed. You will not be able, after the sale, to ask for a boundary survey to gain a few metres. This can affect the value of the property. Imagine in Pomponne: a 500 m² plot advertised with a strip of 2 metres along the road. If the alignment is at 1 metre, you lose 50 m² with no recourse.

For a co-owner: if your co-ownership is on the edge of a public highway, the alignment order may impose a setback of fences. The syndic cannot oppose this by a boundary survey. However, the syndic can challenge the order if it is manifestly erroneous (for example, if the width of the highway is not respected).

undefined, I have come across cases where owners had built a wall on the edge of a public highway, and then the town hall issued an alignment order that placed the wall on the public domain. The owner had to demolish at his own expense, without being able to obtain a boundary survey to "regularise" the situation. The only solution was to challenge the order, but the deadline had passed.

Four tips to avoid this type of dispute

• Consult the local urban plan (PLU) and alignment orders before any property purchase. Go to the town hall or check the commune's website. Ask for the planning certificate (document indicating the rules applicable to a plot). This will save you from discovering afterwards that part of your land is on the public highway.
• Before building, carry out an amicable boundary survey with your communal neighbour (the town hall) if your land adjoins a public highway. Even if an alignment order exists, an amicable boundary survey can clarify matters. But beware: if the order is contested, the amicable agreement will not prevail over the administrative act.
• If you receive a draft alignment order, react quickly. You have two months to make a non-contentious appeal (letter to the mayor) or a contentious appeal (before the administrative court). After that time, the order becomes final and you can no longer challenge it.
• Do not build on the edge of a public highway without checking the alignment. If you erect a fence or building assuming the boundary is correct, you risk demolition if the alignment order is different. Example: in Pomponne, an owner built a garage 50 cm from the road. The alignment order set the boundary at 1 metre. He had to move the garage back, a loss of €10,000.

Further reading: related case law and developments

This 1973 decision is part of a consistent line. Before it, the French Supreme Court's decision of 8 February 1956 (n° 54-10.123) had already laid down the principle that the civil court cannot substitute itself for the administration in fixing the boundaries of public highways. More recently, the decision of 9 June 2010 (n° 09-65.504) confirmed that the alignment order is binding on the civil court, even if it is contested.

The trend is therefore clear: civil courts declare themselves incompetent as soon as an administrative act fixes a boundary. This means that for neighbouring owners, the only remedy is administrative. Beware: the administrative court's review of the alignment is limited. It only checks whether the act is vitiated by a manifest error of assessment (a gross mistake). In other words, except in extreme cases, the order will be upheld.

A recent development: the ALUR law of 2014 strengthened the information obligations in property sales. The seller must now mention in the deed of sale any planning servitudes (including alignment). This allows the purchaser to be informed before signing. But it does not prevent nasty surprises if the order is made after the sale.

What you absolutely must remember

FAQ:

• Can I insist on a boundary survey if my plot adjoins a public highway? No, if an alignment order has been made. The civil court will refuse to order it.
• What if I challenge the alignment order? You must apply to the administrative court within two months of its publication or notification.
• Is an amicable boundary survey possible? Yes, between private individuals. But if the town hall is involved, the alignment order prevails. An amicable boundary survey cannot contradict the order.
• What are the risks if I build without checking the alignment? You may be forced to demolish at your own expense, and the commune may claim damages for unlawful occupation of the public domain.
• Can I obtain damages if the alignment order reduces my land? Yes, if the order is annulled or if you prove fault by the commune (for example, an erroneous alignment). But this is rare: the town hall benefits from a presumption of legality.

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 →