Reference decision: cc • No. 05-10.845 • 2006-02-01 • View the decision →
Imagine: you have just bought a house in Biscarrosse, with your feet in the sand, to spend your family holidays there. Except that after a few months, cracks appear, damp rises, and your dream turns into a nightmare. The seller tells you: 'Sorry, I didn't know.' You can claim a reduction in the price, but on what basis? On what you paid? Or on what the property is actually worth without the defects?
This question, seemingly technical, has considerable financial consequences. The Court of Cassation, in a judgment of 1 February 2006 (no. 05-10.845), ruled: the price reduction claim (Article 1644 of the Civil Code) allows the buyer to be placed in the situation they would have been in if the sold item had not been affected by latent defects, independently of the sale price. In short, you can obtain a refund of the price corresponding to the real value of the property without the defect, even if it exceeds the price you paid.
For an owner in Dax or a buyer in the Landes, this decision changes the situation. In this article, I will explain concretely what it means, how you can invoke it, and above all how to avoid finding yourself in such a situation.
The facts: a story like any other
Mr. and Mrs. Y. buy a residential house in the Landes. Shortly after the sale, they discover that the property is affected by latent defects: serious structural problems that compromise the solidity of the building. They sue the seller in court to obtain a reduction in the price on the basis of the price reduction claim (Article 1644 of the Civil Code).
The Tribunal de Grande Instance of Mont-de-Marsan orders an expert report to determine the reduction in price. The expert concludes that, despite the defects, the property could not have been sold for less than... the price already paid by the buyers. In other words, according to the expert, the property was worth at the time of the sale, even with its defects, the price paid. The Y. couple would therefore be entitled to a refund of... zero euros.
But the Court of Appeal of Pau does not follow this reasoning. It considers that the buyers are entitled to seek a refund of the price, regardless of the sale price. The seller appeals to the Court of Cassation, arguing that the reduction in price must be calculated in relation to the agreed price.
The Court of Cassation dismisses the appeal and confirms the appeal judgment. It clearly states: 'The price reduction claim under Article 1644 of the Civil Code allows the buyer to be placed in the situation they would have been in if the sold item had not been affected by latent defects, independently of the sale price.'
The legal reasoning — analysed
To understand this decision, we must return to Article 1644 of the Civil Code. This text offers the buyer of a property affected by a latent defect (a hidden defect that renders the property unfit for its use or so diminishes its use that the buyer would not have bought it, or would have paid a lower price) a choice: either return the item and have the price refunded (action rédhibitoire), or keep the item and have part of the price refunded (action estimatoire).
Until this judgment, the question was on what basis to calculate the reduction in price. Should the sale price be taken and compared to the value of the property with the defect? Or should the value of the property without the defect be taken and compared to the value with the defect?
The Court of Cassation opts for the second solution. It considers that the purpose of the price reduction claim is to place the buyer in the situation they would have been in if the defect had not existed. Consequently, the reduction in price corresponds to the difference between the value of the property without the defect and the value of the property with the defect, regardless of the actual value of the property on the day of the sale.
This reasoning is logical: if you buy a house for €200,000, but with the defect it is only worth €150,000, you can claim €50,000 refund. But if the house without the defect would be worth €250,000 (because the market has risen), and with the defect it is worth €150,000, you can claim €100,000, even if you only paid €200,000. The important thing is to put you back in the situation you would have been in if the defect had not existed.
What this changes for you — concretely
This decision has major implications for all players in the property market. For a buyer, it offers enhanced protection. You are no longer limited by the price you paid. If the property increases in value between the date of sale and the date of judgment, you can benefit from it.
For a landlord in Dax, who sells a rented property, beware: if the latent defect is discovered after the sale, the buyer can claim a refund based on the real value of the property without the defect, which may be much higher than the sale price. Example: you sell a flat for €150,000. The buyer discovers a latent defect that reduces the value to €100,000. But if the value without the defect is €200,000 (rising market), the buyer can claim €100,000 refund, i.e., more than the price paid!
For a tenant, this is not directly applicable, but if you become an owner, you are protected. For a co-owner, if your management company sells common parts, the same rule applies.
Concretely, if you are in this situation, you must:
- Have the defect verified by a court-appointed or agreed expert.
- Determine the value of the property without the defect (by comparison with similar non-defective properties).
- Summon the seller to court within two years of discovering the defect (Article 1648 of the Civil Code).
However, be aware: this action is only possible if the defect was hidden at the time of sale, i.e., the buyer did not know about it and could not reasonably have discovered it. An apparent defect does not give rise to this protection.
Four tips to avoid this type of dispute
- Carry out complete technical diagnostics before the sale: EPC, asbestos, lead, termites, gas, electricity... But also, for older houses, a structural study by an engineering firm. In Biscarrosse, where buildings are often exposed to damp and termites, these diagnostics are crucial.
- Negotiate a latent defect warranty clause in the sale deed: Even if the law provides for an automatic warranty, you can tailor it (for example, exclude certain known defects, or reduce the limitation period). But beware: you cannot totally exclude the latent defect warranty.
- Keep all documents relating to the property: invoices for work, previous expert reports, correspondence with the seller. These elements can prove that the seller knew about the defect (which increases their liability) or, on the contrary, that they legitimately ignored it.
- Consult a lawyer lawyer as soon as a defect is discovered: The time limits are short (2 years) and the procedure technical. A quick consultation can prevent you from losing your rights. undefined, I have come across cases where buyers waited too long and found themselves time-barred.
Besoin d'un conseil personnalisé ? Contactez Maître Zakine — première consultation 30 min à 45€.
Further analysis: related case law and developments
This decision is part of a consumer-protective trend. The Court of Cassation had already, in a judgment of 20 July 1994 (no. 92-19.154), specified that the reduction in price should be assessed on the day of the sale. But here, it goes further by detaching the calculation from the sale price.
In a later judgment of 5 May 2021 (no. 19-24.835), the Court confirmed this approach regarding the price reduction claim for defects of conformity. The case law therefore seems consistent: the buyer must be placed in the situation they would have been in without the defect, not in the situation they are in after the sale.
This means for the future that sellers must be extremely careful and transparent about the actual condition of the property. Buyers, for their part, have an interest in having the property inspected before purchase, but also afterwards if doubts arise.
In practice: what to do
1. Am I entitled to the price reduction claim? Yes, if the defect was hidden at the time of sale, renders the property unfit for its use or so diminishes its use that you would not have bought it (or at a lower price), and you act within 2 years of discovering the defect.
2. How is the refund calculated? Have the value of the property without the defect estimated by a property expert or notary. Subtract the value of the property with the defect (also assessed). The difference is owed to you, even if it exceeds the price paid.
3. What if the seller refuses? Start court proceedings. It is strongly advisable to use a lawyer specialising in property law. You can also request a judicial expert to establish the defect and its impact on value.
4. What are the risks? If you lose the case, you will have to pay the legal costs and possibly damages to the seller. But if your file is solid, the chances of success are high.
5. Can I also claim damages? Yes, if the seller knew about the defect (bad faith seller), you can obtain additional damages on the basis of Article 1645 of the Civil Code.
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 →

