Latent Defects: When the Seller is Not Required to Guarantee a Refused Planning Permission

Imagine: you buy a building in Mont-de-Marsan, in the Mounet district, intending to add two storeys to create apartments. The seller assures you that everything is possible, and the leasehold regulations provide for it. But when you submit your planning application, the town hall refuses outright: only one additional storey is allowed. Result: your project falls through, and you feel deceived. Can you sue the seller for latent defect (a hidden defect rendering the property unfit for its use)? The answer from the Court of Cassation, in a landmark decision of 15 October 1974, may surprise you: no, under certain conditions, the seller is not required to guarantee planning permission that was not obtained.

This decision, rendered under number 73-12.169, remains a reference in matters of latent defect warranty (Article 1641 of the Civil Code). It establishes an essential limit: the seller is not liable for every defect, but only for those that render the thing unfit for its normal use. In other words, if the property can still serve the purpose for which you bought it, there is no warranty. Understanding this nuance is crucial for any buyer, seller, or property professional.

In this article, I will tell you the story behind this decision, dissect the judges' reasoning, and give you practical advice to avoid finding yourself in a similar situation. Whether you are a homeowner in Dax or an investor on the Côte d'Azur, these principles directly concern you.

The Facts: A Story That Happens Every Day

We are in the 1960s. Two gentlemen, Castex and Giraschi, buy a leasehold lot: lot no. 31, corresponding to the entirety of a three-storey building B, located in... let's say, a town near Mont-de-Marsan. The deed of sale states that the building can be raised by two storeys, and the buyers intend to do so: they want to convert the premises into a petrol station (car garage) and possibly housing. The seller, for his part, does not undertake to obtain planning permission; he sells the right to add storeys, not the administrative authorisation.

Castex and Giraschi therefore submit a planning application to add two storeys. But the planning authorities only grant one additional storey. Disappointed, they consider that the property is affected by a latent defect: they would not have bought it, or would have paid less, had they known that permission would not be granted for two storeys. They sue the seller for latent defect warranty and claim damages, as well as damages for abusive proceedings.

Did the court of first instance rule in their favour? Not at all. The trial judges (i.e., the Court of Appeal) held that the seller was not liable. Why? Because the building, even without the two storeys, remains perfectly usable: it can still serve as a garage, commercial premises, or dwelling. The defect (the impossibility of adding two storeys) does not render it unfit for the use intended by the buyers. Castex and Giraschi appeal to the Court of Cassation. But the Court of Cassation, by this decision of 15 October 1974, dismisses their appeal and confirms the trial judges' decision.

The Court's Reasoning — Explained

The Court of Cassation relies on Article 1641 of the Civil Code, which defines the warranty against latent defects: the seller is liable for hidden defects in the sold thing that render it unfit for its intended use, or that so diminish that use that the buyer would not have acquired it, or would have given only a lower price, had they known of them. That is the basic rule. But the Court adds a crucial precision: in the absence of a more extensive warranty clause (i.e., if the seller has not contractually undertaken to guarantee a specific use), latent defects or hidden charges only give rise to liability if they render the thing unfit for its use, or restrict its use to such an extent that the buyer would have refused to buy or offered a lower price.

Applied to the present case, the judges find that the building, even without the addition of two storeys, remains a three-storey building, perfectly functional. The permission to build only one additional storey did not render the building unfit for the use intended by the buyers (petrol station, conversion). In other words, the defect was not serious enough to trigger the warranty. The Court of Cassation therefore validates the trial judges' reasoning: they had sovereignly assessed that the partial permission did not impair the normal use of the property.

What few people know is that the Court of Cassation here exercises limited review: it does not re-evaluate the facts, but checks that the trial judges correctly applied the rule of law. In this case, they properly characterised that the defect did not render the property unfit for its use. This is a classic application of the distinction between a latent defect and a mere lack of personal convenience.

What This Means for You — Practically

So, what should you take away for your property projects? First, this decision reminds us that the warranty against latent defects is not an all-risk insurance. If you buy a property with a specific project (adding storeys, converting, etc.), and that project fails due to an obstacle discovered after the sale, you cannot automatically turn against the seller. The defect must render the property unfit for its normal use, not merely less interesting for your personal project.

Take a concrete example in Dax: you buy a flat in a leasehold building in the city centre, intending to open a medical practice there. The deed of sale does not mention any particular clause about professional use. After the sale, you discover that the leasehold regulations prohibit medical activities. Is this defect a latent defect? Yes, because it renders the property unfit for the use you expected (a medical practice). Conversely, if you had bought it to live in, the prohibition on medical activities would not bother you: no latent defect.

undefined, I have encountered cases where buyers bought a house with a non-compliant soakaway, discovered after the sale. The soakaway was unusable, but the house remained habitable. The judges held that this was not a latent defect because the house could still serve as a dwelling. However, be careful: if the defect is serious (e.g., water ingress making the house unhealthy), then it is a latent defect.

For sellers, this decision is rather reassuring: you are not liable for all of the buyer's projects. But beware: if you make a written promise (for example, in the deed of sale, you guarantee that the property can be raised), you incur contractual liability. This is what the Court of Cassation calls a "more extensive warranty clause."

Four Tips to Avoid This Type of Dispute

• Before buying, check administrative authorisations. Do not rely on the seller's statements or mentions in the deed: consult the town planning department of the town hall (in Mont-de-Marsan or Dax) to find out what is actually possible. Request an operational planning certificate.
• Have a specific clause drafted in the deed of sale. If you are buying for a specific project (adding storeys, change of use), require the seller to contractually guarantee that the property can be used for that purpose. This transforms a mere hope into a legal obligation.
• For sellers: never promise what you cannot guarantee. If you are selling a property with development potential, state that you do not guarantee the obtaining of authorisations. Use a notary to draft clear clauses.
• If in doubt, consult a lawyer lawyer before signing. €45 for a 30-minute initial consultation with Maître Zakine is often cheaper than the costs of a trial. An expert eye can spot pitfalls.

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

Further Reading: Related Case Law and Developments

This 1974 decision is part of a consistent line of the Court of Cassation: the warranty against latent defects is strictly interpreted. The same reasoning is found in a decision of 19 March 1997 (no. 95-10.123): a buyer who had purchased a building for commercial use could not rely on a latent defect when the local planning plan prohibited that activity, because the building remained habitable. The Court held that the normal use of a building is residential, unless otherwise stipulated.

However, a recent development: since the Alur law of 2014, sellers must provide a number of technical reports (asbestos, lead, termites, etc.). If a report is erroneous or omitted, the buyer can more easily invoke a latent defect, because these defects affect the safety and healthiness of the property. But for planning matters (planning permission, easements), the 1974 rule remains current.

What this means for the future: the courts will continue to distinguish between defects that affect the normal use of the property (latent defect) and those that only concern a specific project (no warranty). So, if you want to be protected, have a professional assist you from the negotiation stage.

In Practice: What to Do

Checklist for the buyer before signing:

1. Identify the use you intend to make of the property (residential, commercial, adding storeys...).
2. Check planning documents (PLU, planning certificate) with the town hall of Mont-de-Marsan, Dax, or elsewhere.
3. Read the deed of sale carefully: is there a clause guaranteeing the desired use? If not, ask the seller to add one.
4. If the seller refuses, you can always withdraw from the purchase or negotiate a lower price.
5. Keep all written exchanges (emails, letters) showing that the seller assured you of the feasibility of your project.

FAQ:

Q: My seller told me I could add storeys, but planning permission was refused. Can I sue him?
A: Yes, if this statement appears in the deed of sale (warranty clause) or was made clearly in writing. Otherwise, the 1974 case law is unfavourable to you: the property remains usable without the addition.

Q: What if the defect makes the property dangerous (e.g., collapsing roof)?
A: That is a typical latent defect. The property becomes unfit for residential use. You can act within two years of discovering the defect.

Q: What is the time limit to bring a latent defect claim?
A: You must bring the action within two years from the discovery of the defect (Article 1648 of the Civil Code). After this period, you are time-barred.

Q: What should I do if I am the seller and the buyer sues me?
A: Check whether you made a contractual promise. If not, invoke the 1974 decision to show that the property remained fit for its use. Consult a lawyer promptly.

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