Drought and Clay Subsidence in France: Legal Protection for Foreign Property Buyers in 2026
France is living through its most severe drought on record. In July 2026, groundwater levels were below average at 63% of monitoring points and falling at 94% of them, according to reports in the French and international press, while three heatwaves in two months have pushed the Caisse centrale de réassurance (CCR), the state-owned reinsurer, to warn that 2026 could match 2022 — the costliest year on record for drought damage to homes. The numbers are striking: an estimated 12 million houses, roughly 60% of the French housing stock, are built on clay soils susceptible to retrait-gonflement des argiles (clay shrink-swell), and CCR now puts the long-term repair bill in the hundreds of billions of euros.
For buyers from the United Kingdom, the United States and Australia, this is not an abstract climate debate. It is a legal one. Cracks in walls and foundations, the refusal of an insurer to pay, a seller who concealed a past drought claim, an outdated état des risques (natural risk disclosure statement) in the sale file — each of these situations is now governed by a body of French law that the Cour de cassation has been refining, including in rulings handed down in 2024, 2025 and as recently as February 2026. This article sets out, step by step, how drought damage is compensated in France, what the seller must disclose before you sign, and what remedies you have after completion if the house starts cracking. It is written for foreign buyers who are not familiar with the French system, and it refers exclusively to official sources: the French Civil Code, the Insurance Code, the Environmental Code, the Construction and Housing Code, and published decisions of the Cour de cassation with their official links.
I. How French Law Compensates Drought Damage: The Catastrophes Naturelles Regime
Drought damage to private homes is not covered by ordinary building insurance. It is covered by a dedicated mechanism created in 1982, the régime des catastrophes naturelles (natural disasters regime, often shortened to “cat nat”). Every home insurance policy in France must automatically include this extension by law, and it is funded by a levy on every policy. Understanding its exact scope, and its strict deadlines, is the first thing any owner — resident or non-resident — must master.
A. The Scope of the Guarantee: Direct Material Damage Only, Caused by a Recognised Event
The legal foundation is Article L. 125-1 of the French Insurance Code, which defines the covered damage as “les dommages matériels directs non assurables ayant eu pour cause déterminante l’intensité anormale d’un agent naturel” — in plain English, direct material damage that could not be insured against through ordinary policies, caused in a decisive way by the abnormal intensity of a natural agent. Since the reform enacted by the law of 28 December 2021, which took effect on 1 January 2024, the text adds a specific rule for clay soils: for mouvements de terrain différentiels consécutifs à la sécheresse et à la réhydratation des sols (differential ground movements caused by drought and by soil rehydration), the guarantee requires a “succession anormale d’événements de sécheresse d’ampleur significative” — an abnormal succession of significant drought episodes, rather than a single dry spell.
Two practical consequences follow directly from this definition, and both have been confirmed by the Cour de cassation in recent years.
First, the damage must result from a natural event that has been formally recognised by the state. Recognition takes the form of an arrêté interministériel (joint ministerial order) declaring the municipality in a state of natural disaster and specifying the period and the nature of the covered damage. Without such an order covering your commune and the relevant period, the insurance extension is not triggered. This is why the first question any owner asks after discovering cracks is whether their municipality has been recognised, and for which period.
Second, the guarantee is strictly limited to direct material damage. In Cass. 2e civ., 9 November 2023, no. 22-13.156, a couple from Barjac (Gard) whose house had been damaged by drought asked their insurer to reimburse their relocation costs and storage costs for furniture during the repair works. The Cour de cassation struck those amounts down, ruling that “ne sont pas garantis à ce titre les dommages immatériels” — intangible losses, such as moving and storage expenses, are not covered by the cat-nat guarantee. The repair of the foundations, walls and finishes is covered; the disruption around it, as a general rule, is not.
The same strict reading applies to the burden of proving the cause. In Cass. 2e civ., 12 February 2026, no. 24-15.504, the Cour de cassation quashed a Court of Appeal decision that had ordered the insurer MMA to pay €40,000 for cracks in a building. The appeal court had assumed, from the absence of visible cracks at the time the policy was taken out, that the damage was caused by the exceptional droughts of 2016 and 2017. The Cour de cassation held that the judges must verify, under Article L. 125-1, whether “les mesures habituelles à prendre pour prévenir ces dommages n’ont pu empêcher leur survenance ou n’ont pu être prises” — that is, whether the usual preventive measures could not prevent the damage, or could not have been taken. The lesson for owners is simple: do not assume that the insurer will pay on the basis of a visual inspection. You will need a technical expert’s report demonstrating that the drought, not the age of the building or pre-existing fragility, is the decisive cause, and that prevention was impossible or ineffective.
B. Claims, Recognition and Time Limits: The Deadlines You Must Not Miss
Time limits are the second pillar of the regime, and they are strictly enforced. There are three distinct clocks, and a foreign owner who misses any of them loses the claim entirely.
The first clock concerns the request for recognition. Under Article L. 125-1 of the Insurance Code, the municipality must apply to the prefect for recognition of the state of natural disaster, and no application can succeed if it is filed more than twenty-four months after the start of the natural event. As a homeowner you cannot act directly: the request is made by the mayor, and recognition is published in the Journal officiel. In practice, owners should contact their town hall promptly after a drought episode and monitor the publication of the orders.
The second clock concerns the claim against the insurer. The general rule, set out in Article L. 114-1 of the Insurance Code, is that actions arising from an insurance contract are barred after two years. By exception, since the law of 28 December 2021, claims relating to damage caused by mouvements de terrain consécutifs à la sécheresse-réhydratation des sols (ground movements consecutive to drought and soil rehydration) are barred after five years. In both cases, however, the starting point is not the date of the drought, nor even the date of the damage: it is the moment the policyholder learned of it, if he can prove he was previously unaware. For cat-nat damage, the Cour de cassation has combined this with the specific rule that the limitation period cannot start before the arrêté recognising the catastrophe is published.
In Cass. 2e civ., 11 July 2024, no. 22-21.366 (published in the Bulletin), buyers of a house in Haute-Garonne discovered micro-cracks in July 2004 and later learned, through the expert’s report delivered in July 2016, that the damage originated from the drought episode of spring 2011, recognised as a natural catastrophe by an order published in August 2012. The Court of Appeal had barred their claim, holding that the two-year period ran from publication of the order. The Cour de cassation quashed the decision, stating that “le point de départ de la prescription de l’action en indemnisation des conséquences dommageables d’un sinistre de catastrophe naturelle se situe à la date de publication de l’arrêté, mais peut être reporté au-delà si l’assuré n’a eu connaissance des dommages causés à son bien par ce sinistre qu’après cette publication” — the limitation period for a cat-nat claim starts at the publication of the order, but is postponed if the policyholder only became aware of the damage after that date. The combination of Article L. 114-1 of the Insurance Code and Article 2224 of the Civil Code, under which personal actions are barred after five years from the day the claimant knew or should have known the facts enabling the action, therefore gives owners meaningful protection — provided they act within the window once the damage becomes apparent.
The third practical point is documentation. Insurers will ask for proof of when the damage first appeared, photographs, and often a geotechnical study. Keep every document, in French where possible, and notify the insurer in writing (recorded delivery with acknowledgement of receipt, lettre recommandée avec accusé de réception) within the applicable period. For non-resident owners, the question of which insurer to contact — the French home insurer — is straightforward, but the question of who is entitled to make the claim when the property is owned through a French SCI (property holding company) deserves specific advice, because the policyholder must match the insured entity. A lawyer familiar with both French property law and the practicalities of cross-border ownership, such as the real estate team at Kohen Avocats in Paris, can review your ownership structure before you ever need to claim.
II. Buying in Clay-Prone Areas: Disclosure, Hidden Defects and Practical Protection
The second part of this article addresses the purchase itself. The 2026 drought has made clay risk a mainstream concern for buyers, and French law gives buyers two complementary layers of protection: mandatory information before the sale, and the seller’s legal liability after it.
A. What the Seller Must Disclose: The État des Risques and the Diagnostics File
French law requires the seller of a property located in a risk zone to inform the buyer, through a standardised document called the état des risques (natural risk disclosure statement). This obligation is set out in Article L. 125-5 of the Environmental Code, which provides that buyers of property “situés dans des zones couvertes par un plan de prévention des risques technologiques, par un plan de prévention des risques miniers ou par un plan de prévention des risques naturels prévisibles, prescrit ou approuvé” — located in areas covered by a technological, mining or natural risk prevention plan (plan de prévention des risques naturels, PPRN), prescribed or approved — must be informed of these risks. The statement is generated from official data on the government’s Géorisques platform, where the exposure of every commune to clay shrink-swell is mapped and, since the revised maps published in 2025 and 2026, increasingly precise. The statement must be annexed to the sale file, and its absence or inaccuracy can be sanctioned, under Article L. 125-5 V, by the buyer “poursuivre la résolution du contrat ou demander au juge une diminution du prix” — bringing an action to rescind the sale or asking the court to reduce the price.
The état des risques is one component of the dossier de diagnostic technique (technical diagnostics file) which, under Article L. 271-4 of the French Construction and Housing Code, must be attached to the compromis de vente (preliminary sale agreement) or, if there is none, to the acte authentique (final notarial deed). The text is explicit about the consequence of a missing risk statement: “En l’absence, lors de la signature de l’acte authentique de vente, du document mentionné aux 5° et 12° du I, l’acquéreur peut poursuivre la résolution du contrat ou demander au juge une diminution du prix” — if the risk statement is missing at the final deed, the buyer may seek rescission or a price reduction.
This is not a theoretical sanction. In Cass. 3e civ., 19 February 2026, no. 24-10.524 (published in the Bulletin), a couple had bought a building plot in the Hérault on 21 and 23 March 2012. A flood risk prevention plan (PPRN) for the commune had been approved by prefectoral order on 28 February 2012 — after the promesse de vente (promise to sell) of 3 November 2011 but before the final deed. The seller produced an état des risques dated 3 November 2011 which only mentioned the prescribed (not yet approved) plan, and the notary did not update it. In 2016, the buyers discovered they could not build: the plot was in the plan’s very high flood-hazard zone, and a negative planning certificate confirmed it. The Court of Appeal dismissed their claims, but the Cour de cassation quashed the decision, holding that “si, après la promesse de vente, la parcelle sur laquelle est implanté l’immeuble objet de la vente est inscrite dans une zone couverte par un plan de prévention des risques naturels prévisibles prescrit ou approuvé, le dossier de diagnostic technique est complété, lors de la signature de l’acte authentique de vente, par un état des risques ou par une mise à jour de l’état existant” — if, after the preliminary contract, the plot enters a zone covered by a prescribed or approved PPRN, the file must be completed at the final deed with a new or updated risk statement. The seller and the two notaries were ordered to bear the costs. For a foreign buyer, the practical rule is simple: check the date of the état des risques, verify on Géorisques that it reflects the current exposure (including approved plans), and ask the notary to confirm in writing that the statement was updated at the final deed.
Finally, sellers must also answer questions about past damage truthfully. In Cass. 3e civ., 18 January 2023, no. 21-24.266, the deed stated that the house had never suffered a claim arising from a natural or technological disaster, although the region had experienced several droughts. The buyers later faced cracks and sued for dol (fraudulent misrepresentation). The Cour de cassation upheld the dismissal of their claim, but on instructive grounds: the false declaration was indeed established, yet the buyers had been fully informed of the drought risk because the list of natural catastrophe orders for the commune was set out in the deed itself, and the house had been stable for eleven years. The Court recalled that “l’erreur provoquée par le dol devait avoir été déterminante du consentement” — the mistake induced by the fraud must have been decisive of the buyer’s consent. The lesson cuts both ways: a misleading declaration is not automatically actionable, but the deed’s contents — including the list of past arrêtés and the seller’s warranty declarations — become the central piece of evidence in any dispute.
B. Hidden Defects After Purchase: The Seller’s Liability Under Vices Cachés
If cracks appear or worsen after completion, the buyer’s second layer of protection is the seller’s legal warranty against hidden defects, the garantie des vices cachés. Article 1641 of the Civil Code states that “Le vendeur est tenu de la garantie à raison des défauts cachés de la chose vendue qui la rendent impropre à l’usage auquel on la destine, ou qui diminuent tellement cet usage que l’acheteur ne l’aurait pas acquise, ou n’en aurait donné qu’un moindre prix, s’il les avait connus” — the seller guarantees against hidden defects that make the property unfit for its intended use, or reduce its use to the point that the buyer would not have bought it, or would have paid less, had he known. The buyer can choose, under Article 1644 of the Civil Code, between rescission of the sale and a reduction of the price, plus damages if the seller was in bad faith.
The boundaries of this warranty have been clarified by the Cour de cassation in cases directly involving cracks, clay soils and drought. Three points matter most for a foreign buyer.
First, a defect is not “hidden” simply because it is not visible from the pavement. Under Article 1642 of the Civil Code, “Le vendeur n’est pas tenu des vices apparents et dont l’acheteur a pu se convaincre lui-même” — the seller is not liable for apparent defects which the buyer could have discovered for himself. The Cour de cassation interprets this strictly in the buyer’s favour. In Cass. 3e civ., 14 September 2023, no. 22-16.638, buyers of a house in Isère sued after discovering “numerous cracks in every room and on every facade” — the expert recommended demolition and reconstruction. The Court of Appeal dismissed their claim, reasoning that metal tie rods installed years earlier and some visible cracks should have alerted the buyers. The Cour de cassation quashed the decision, ruling that the judges had to examine whether the buyers could have appreciated, by themselves, “l’ampleur et des conséquences des fissures” — the full scale and consequences of the cracks — which were evolving and, according to the expert, compromising the structure. A few visible cracks, or even structural clues, do not necessarily make the defect apparent; its true extent often only emerges from a full expert report.
Second, a seller who conceals cracks loses the benefit of any exclusion clause. In Cass. 3e civ., 7 March 2024, no. 20-17.790, sellers in Noisy-le-Grand (Seine-Saint-Denis) sold a house for €325,000 after filling in cracks and re-rendering the facades before the sale. The buyers discovered cracks caused by the 2003 drought and the clay nature of the soil. The Cour de cassation upheld the award against the sellers of €202,267.20 by way of price reduction plus €7,800 in damages. The Court found that “les vendeurs, qui connaissaient les problèmes de structure de l’immeuble depuis 1980 ainsi que l’ampleur des fissurations réapparues en 2003, avaient, par ces travaux de colmatage, cherché à les dissimuler” — the sellers, who had known about the structural problems since 1980 and about the extent of the cracks that reappeared in 2003, had sought to conceal them by filling them in. Because they were in bad faith, the standard clause excluding the vices cachés warranty in the deed was of no avail to them. The deed’s declaration that the property had suffered no natural catastrophe claim — the very clause at issue in the 2023 decision — must therefore be read carefully, and any cosmetic work visible on the facades should raise a question rather than provide comfort.
Third, timing is again critical. The action for hidden defects is a personal action barred after five years under Article 2224 of the Civil Code, running from the day the buyer knew or should have known of the defect — in practice, the date of the expert report confirming the cause and extent of the damage. As the Cour de cassation made clear for insurance claims in the 2024 ruling discussed above, the knowledge requirement is applied rigorously, but it does not reward inaction: once the damage is apparent and its origin established, the five-year clock starts running, and it is prudent to act well before it expires. The claim requires proof of three elements: the defect existed at the date of the sale, it was hidden, and it makes the property unfit for its intended use or materially reduces its value. A court-appointed expert (expert judiciaire) is almost always necessary, and the expert report, obtained through a pre-litigation application (référé expertise), is the document that will make or break the claim.
Conclusion
The 2026 drought is a legal as much as a climatic event. For foreign buyers and owners, the French system offers real protection, but only to those who respect its mechanics. Before signing, verify the état des risques, check the commune’s exposure to clay shrink-swell on Géorisques, read the seller’s declarations about past claims, and ask your notaire (French notary, the public officer who drafts and secures the deed) to confirm that every document in the diagnostics file is current and was updated at the final deed — the Cour de cassation’s February 2026 ruling shows that a stale risk statement can turn a purchase into a litigation file. After completion, keep a photographic record of the property’s condition, notify your French home insurer in writing without delay if cracks appear, and remember the two key periods: the five-year limitation for drought-related insurance claims since the 2021 reform, and the five-year period for a hidden-defect claim against the seller, both running from the date you actually became aware of the damage.
Insurance indemnities paid under the cat-nat regime are designed to restore the damaged property; their tax treatment depends on your country of residence and the ownership structure, and should be reviewed with your tax adviser. From a legal standpoint, the essential steps are documentation, deadlines and expert evidence. If you are considering a purchase in a clay-prone region, or if a property you already own has started to crack, a lawyer specialising in French real estate law — such as the team at Kohen Avocats, with its real estate law practice for international clients in Paris — can help you structure the transaction, review the sale file, and secure your rights within the applicable time limits. The drought will pass; the legal consequences of the purchase will last much longer.