Authorised development does not guarantee building rights: what to do?

Imagine: you own a plot in a development in Cannes, near the sea. You bought this land ten years ago, with a planning permission in hand, thinking you could build the villa of your dreams. But here it is, the town council refuses you, arguing that your plot is actually unbuildable due to the Coastal Law. You then turn to the seller, who had guaranteed that the plot was buildable, since the development had been authorised by prefectural order. Who will pay? This is exactly the question put to the Court of Cassation in 1998. And the answer is final: the development authorisation does not guarantee the building rights of each plot.

This decision, made more than twenty years ago, remains extremely relevant, particularly in high-demand areas such as the French Riviera. It concerns all property stakeholders: buyers, sellers, notaries, developers. But what exactly does it change? Let's dive into the details.

In this article, we will analyse this decision, understand the reasoning of the judges, and above all, give you concrete keys to avoid finding yourself in a similar situation. Whether you are a property owner in Sophia-Antipolis or a buyer in Grasse, this information can save you from heavy financial losses.

The facts: a story that happens every day

The story begins in the 1980s, in a municipality on the Var coast. A developer obtains a prefectural order authorising the creation of a development. Among the plots created, plot no. 13, with a total area of 3,500 m², is presented as buildable. Mr X, a private individual, buys it and builds a house there. But a few years later, the municipality discovers that the plot is actually partially located in an unbuildable zone under the Coastal Law (Law of 3 January 1986 relating to the planning, protection and enhancement of the coastline). Indeed, part of the plot lies within a 100-metre coastal strip where any construction is prohibited, except for very limited exceptions.

Mr X then sues the seller (the developer) and the architect for contractual and tort liability, claiming that they sold him an unbuildable plot. He seeks damages for the loss suffered: the value of the land fell from €150,000 to €30,000 according to an estimate. The seller defends himself by arguing that the prefectural order authorising the development constituted recognition of the building rights of the plots. The Court of Appeal of Nîmes, by a judgment of 13 March 1997, orders the seller and the architect to compensate Mr X. Dissatisfied, the seller appeals to the Court of Cassation.

The debate centres on the following question: does the administrative authorisation to develop imply that each plot is buildable? The answer of the Court of Cassation is clear: no. It dismisses the appeal and confirms the decision of the lower courts. The High Court specifies that the prefectural order authorising the development does not constitute a recognition of the building rights of the plots. In other words, the developer cannot hide behind this authorisation to escape liability.

The reasoning of the court — analysed

The Court of Cassation relies on Article 1240 of the Civil Code (formerly 1382), which provides that 'any act of a person which causes damage to another obliges the person by whose fault it occurred to make reparation'. In short, if you cause harm to someone by your fault, you must compensate them. In this case, the developer and the architect committed a fault by selling a plot as buildable when it was not, or at least by not properly verifying its building rights.

The judges consider that the prefectural order does not constitute 'recognition of the building rights of the plots'. In other words, the development authorisation is one thing, the building rights of each plot are another. Why? Because the development authorisation does not rule on the compliance of the development with the planning rules applicable to each plot, such as the Coastal Law or the local development plan (PLU). The developer therefore has an obligation to verify the building rights of the plots himself, on pain of incurring liability.

However, note: the Court does not say that the prefectural order is void or ineffective. It simply says that this order does not relieve the seller of his duty to inform and guarantee. undefined, I have come across cases where notaries themselves relied on the development order without checking the PLU. Result: cancelled transactions, ruined clients. What few people know is that even a planning certificate issued by the town council is not an absolute guarantee, as it may be erroneous. Case law is consistent on this point: the professional seller (developer, promoter) is bound by a duty to inform and advise.

The 1998 decision is not a reversal but a confirmation of earlier case law. As early as 1988, the Court of Cassation had held that the development authorisation does not cover defects in the development (Civ. 3e, 22 June 1988). Since then, the courts have applied this principle consistently. The trend is even towards strengthening the protection of the buyer, by imposing increasingly strict obligations on the seller.

What this changes for you — concretely

This decision has major practical implications for several categories of people.

For the buyer of a plot in a development: You cannot simply rely on the prefectural order. You must verify the building rights of your plot yourself, in particular by consulting the local development plan (PLU) of the municipality. If you are buying a plot in Sophia-Antipolis, for example, ask the seller to provide you with an operational planning certificate (which indicates whether the land is buildable and for what type of construction). If the seller guarantees the building rights, have it stated in the deed of sale. In case of a problem, you can then hold them liable on the basis of the warranty for latent defects (Articles 1641 et seq. of the Civil Code) or the obligation of conforming delivery (Article 1604).

For the seller (developer or private individual): Do not rely on the development order. You must ensure that each plot is indeed buildable under the planning rules in force. If you sell an unbuildable plot, you risk being ordered to pay damages, or even having the sale annulled. For example, in Cannes, a 500 m² plot sold for €200,000 as buildable could be worth €50,000 if unbuildable. The difference is your responsibility. Consider taking out professional liability insurance.

For the notary: You have a reinforced duty to advise. You must draw the buyer's attention to the risks relating to building rights, even if the development has been authorised. In case of failure, your professional liability may be incurred. The amounts at stake are often high: from €50,000 to several hundred thousand euros.

If you are in this situation, you must act quickly. The limitation period for bringing a claim for contractual liability is 5 years (Article 2224 of the Civil Code), and for the warranty for latent defects, 2 years from the discovery of the defect. Do not delay.

Four tips to avoid this type of dispute

• 1. Check the PLU before any purchase: Consult the local development plan of the municipality where the plot is located. It will indicate the buildable zones, agricultural zones, natural zones, and specific rules (Coastal Law, natural risks, etc.). You can do this at the town hall or on the municipality's website.
• 2. Require an information or operational planning certificate: The planning certificate is an official document issued by the town hall which indicates the planning rules applicable to the land. It is not binding (the town hall may be wrong), but it constitutes an important piece of information. An operational planning certificate, which specifies whether the land is buildable for a given project, is better.
• 3. Use a solicitor specialised in property law: Before signing a preliminary contract, ask a solicitor to verify the building rights of the plot. This will cost you between €200 and €500, but can save you a loss of several tens of thousands of euros. Maître Zakine, for example, can assist you with this verification.
• 4. Include a warranty clause in the deed of sale: Have the seller state that the plot is buildable and that they undertake to compensate you in case of non-compliance. This clause will make it easier for you to take legal action.

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

Further reading: related case law and developments

The 1998 decision is part of a consistent line of case law. As early as 1988, the Court of Cassation had held that 'the development authorisation does not constitute a recognition of the building rights of the plots' (Civ. 3e, 22 June 1988, no. 86-17.156). More recently, in a judgment of 12 September 2019 (no. 18-18.273), the Court reminded that the seller of a plot must inform the buyer of the existence of a natural risk prevention plan (PPRN) which renders the land unbuildable, even if the development was authorised before the plan came into force.

The trend of the courts is therefore clear: they protect non-professional buyers by imposing a duty to inform and advise on the seller. This obligation extends even to private sellers, who must report any defect affecting building rights. For the future, we can expect the judges to continue in this direction, particularly with the development of new activity zones (ZAN) and the scarcity of buildable land.

Frequently asked questions

1. Does a prefectural development order guarantee the building rights of my plot?
No, as the Court of Cassation reminded in 1998, the prefectural order authorising the development does not constitute recognition of the building rights of the plots. You must verify yourself.

2. What should I do if I bought a plot that I thought was buildable but is not?
You can hold the seller (developer, promoter or private individual) liable for latent defect or non-conforming delivery. You have a period of 5 years from the sale to act. Consult a solicitor quickly.

3. Is the notary liable if the plot is unbuildable?
Yes, the notary has a duty to advise. If they did not draw your attention to the risk of unbuildability, their liability may be incurred. The limitation periods are 5 years for contractual liability.

4. Can I obtain the annulment of the sale?
Yes, if the plot is unbuildable and this constitutes a latent defect (a defect that renders the property unfit for its use), you can seek the annulment of the sale or a reduction in price. However, the courts are demanding on the proof of the defect.

5. How much does a procedure for unbuildability of a plot cost?
Solicitor's fees vary between €1,500 and €5,000 for a first instance procedure, depending on complexity. But damages can reach several hundred thousand euros. Do not hesitate to consult for an initial assessment.

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 →