Buying property in France is a milestone many international purchasers prepare for with care. The legal framework is structured and, for the most part, predictable. Yet when a transaction unravels \u2014 whether because a seller conceals crucial information, a buyer vanishes after signing the compromis de vente<\/em> (preliminary sale agreement), or an estate agent claims a commission on a deal that never closed \u2014 the consequences can be severe and the legal remedies unfamiliar. This article examines the French legal architecture governing failed property transactions and fraudulent behaviour, anchored in recent decisions of the Cour de cassation, and explains what foreign buyers, sellers and investors should understand before they sign.<\/p>\n\n\n\n At Kohen Avocats<\/a>, our bilingual team assists Anglophone clients with every stage of French property transactions, from the initial memorandum of understanding through to litigation before the Tribunal Judiciaire. This article is written for a practical audience: it assumes no prior knowledge of French civil procedure but aims to deliver enough legal precision to be useful.<\/p>\n\n\n\n For buyers arriving from the United Kingdom or the United States, the compromis de vente<\/em> is often mistaken for a non-binding offer or a simple reservation agreement. It is neither. Under French law, once both parties have signed and the ten-day cooling-off period has expired, the compromis<\/em> is a binding contract. Walking away carries financial and, potentially, legal consequences.<\/p>\n\n\n\n Article 1583<\/a> of the French Code civil<\/em> states a principle that surprises many Anglo-Saxon buyers: \u00ab Elle est parfaite entre les parties, et la propri\u00e9t\u00e9 est acquise de droit \u00e0 l’acheteur \u00e0 l’\u00e9gard du vendeur, d\u00e8s qu’on est convenu de la chose et du prix. \u00bb<\/em> The sale is perfect, and ownership transfers as between the parties, as soon as they agree on the item and the price \u2014 even before payment or delivery. Article 1589<\/a> extends the same logic: a promise of sale is equivalent to a sale when there is mutual consent on the property and the price.<\/p>\n\n\n\n Two types of preliminary agreements exist in France. A promesse unilat\u00e9rale de vente<\/em> (unilateral promise of sale) binds the seller for a certain period while giving the buyer an option to purchase; if the buyer does not exercise the option within the stipulated period, the promise lapses. A promesse synallagmatique de vente<\/em> (bilateral promise, often just called a compromis de vente<\/em>) binds both parties immediately, subject only to the satisfaction of any conditions suspensives. The distinction is critical: in the first, the buyer can walk away; in the second, neither party can, absent the failure of a condition or a valid legal ground for annulment.<\/p>\n\n\n\n The Cour de cassation reaffirmed this principle in a March 2026 ruling concerning an agent’s right to a commission on a promesse unilat\u00e9rale<\/em> that was never completed. The Third Civil Chamber held that \u00ab le b\u00e9n\u00e9ficiaire d’une promesse unilat\u00e9rale de vente avait la facult\u00e9, m\u00eame lorsque toutes les conditions suspensives sont remplies, de renoncer sans faute au b\u00e9n\u00e9fice de l’avant-contrat. \u00bb<\/em> \u2014 the beneficiary of a unilateral promise may, even after all conditions are satisfied, renounce the benefit of the preliminary contract without committing a fault (Cass. 3e civ., 26 Mar. 2026, no. 24-13.838<\/a>). This holding demonstrates why the structure of the preliminary agreement matters so much: a seller who signs a unilateral promise takes a real risk, while a buyer who signs a bilateral compromis<\/em> does too.<\/p>\n\n\n\n Most compromis de vente<\/em> agreements require the purchaser to lodge a deposit \u2014 usually 5\u00a0% to 10\u00a0% of the purchase price \u2014 with the notary within a few days of signing. This deposit is not a token sum; it is a d\u00e9p\u00f4t de garantie<\/a><\/em> (security deposit) that the seller may retain if the buyer withdraws in breach of contract, unless the withdrawal is justified by the non-fulfilment of a condition suspensive<\/a><\/em> (suspensive condition).<\/p>\n\n\n\n The most common conditions suspensives are the buyer’s obtaining of a mortgage loan and the absence of a pre-emption right exercised by a public authority. Article 1304-3<\/a> of the Code civil<\/em> provides that a condition suspensive is deemed fulfilled if the party who stood to benefit from it prevented its fulfilment \u2014 a rule that can work in either party’s favour.<\/p>\n\n\n\n The Cour de cassation has repeatedly emphasised that the failure of a condition suspensive extinguishes the obligation retroactively. In a June 2024 ruling, the Third Civil Chamber applied Article 1304-6<\/a> of the Code civil<\/em> and held: \u00ab en cas de d\u00e9faillance de la condition suspensive, l’obligation est r\u00e9put\u00e9e n’avoir jamais exist\u00e9. \u00bb<\/em> \u2014 where a suspensive condition fails, the obligation is deemed never to have existed (Cass. 3e civ., 20 Jun. 2024, no. 23-12.106<\/a>). The practical consequence is straightforward: if a buyer’s loan application is refused and the buyer can prove it, the deposit must be returned. If, however, the buyer simply changes their mind, the seller is entitled to retain the deposit and may also enforce any penalty clause.<\/p>\n\n\n\n Penalty clauses (clauses p\u00e9nales<\/em>) are common and can be substantial \u2014 often 10 % of the purchase price. The Cour de cassation has clarified that such clauses remain enforceable even after the underlying promise has lapsed, provided they were designed to sanction the behaviour of the party that prevented the conditions from being met. In a November 2023 decision, the Third Civil Chamber stated: \u00ab la clause p\u00e9nale stipul\u00e9e dans la promesse de vente, dont la force ex\u00e9cutoire, qui n’\u00e9tait pas atteinte par la caducit\u00e9 de la promesse de vente, avait pour but de sanctionner le comportement de l’une des parties qui aurait emp\u00each\u00e9 la r\u00e9alisation de ses conditions. \u00bb<\/em> \u2014 the penalty clause remained enforceable notwithstanding the caducity of the promise, because its purpose was to sanction conduct that blocked the conditions (Cass. 3e civ., 23 Nov. 2023, no. 22-22.307<\/a>). For a foreign buyer this is an essential point: a penalty clause is not rendered void merely because the sale did not close. Whether it is enforceable depends on why the transaction failed.<\/p>\n\n\n\n A December 2023 ruling provides a further cautionary note. The Cour de cassation upheld the forfeiture of a \u20ac12,200 deposit after the buyers refused to complete a sale, arguing that structural cracks constituted a vice cach\u00e9<\/em> (hidden defect). The Court noted that \u00ab par leur importance et leur \u00e9tendue, elles n’avaient pu \u00e9chapper \u00e0 un acqu\u00e9reur normalement diligent \u00bb<\/em> \u2014 the cracks, by their size and extent, could not have escaped a normally diligent purchaser (Cass. 3e civ., 21 Dec. 2023, no. 22-21.234<\/a>). Visible defects are not hidden, and relying on the vice cach\u00e9<\/em> guarantee to avoid a deposit penalty will fail where the defect was apparent on reasonable inspection. Foreign buyers who view a property only once, or who rely on photographs sent by an agent, should take particular note.<\/p>\n\n\n\n When a property transaction collapses, the question of who bears responsibility is often central. Three categories of potential liability arise: the seller’s liability for fraud or non-disclosure, the estate agent’s duty to verify the parties, and, in some cases, the notary’s obligation to ensure the act’s legal efficacy.<\/p>\n\n\n\n French law recognises dol<\/em> (fraudulent misrepresentation) as a vice of consent that can nullify a contract. Article 1137<\/a> of the Code civil<\/em> defines dol<\/em> as obtaining the other party’s consent through manoeuvres or lies; it also encompasses r\u00e9ticence dolosive<\/em> \u2014 the intentional concealment of information known to be determinative for the other party. Critically, the same article excludes from the definition of dol<\/em> the mere failure to disclose one’s own estimate of the property’s value.<\/p>\n\n\n\n To succeed in an action for dol<\/em>, the buyer must prove (i) the existence of deliberate concealment or deception, (ii) that the concealed information was determinative of consent, and (iii) that the error induced by the dol<\/em> was excusable. The burden of proof rests on the buyer, and dol<\/em> is never presumed.<\/p>\n\n\n\n A July 2024 ruling of the Cour de cassation illustrates how difficult this proof can be. In that case, an acquirer sought annulment of a sale on the ground that the sellers had concealed the fact that the chalet was built without proper planning permission and was located in a zone non constructible<\/em> (non-buildable zone). The Court of Appeal had annulled the sale, finding that the sellers had committed a r\u00e9ticence dolosive<\/em>. The Cour de cassation quashed the decision, applying Article 1116 of the former Code civil<\/em> and recalling: \u00ab le dol est une cause de nullit\u00e9 de la convention lorsque les manoeuvres pratiqu\u00e9es par l’une des parties sont telles, qu’il est \u00e9vident que, sans ces manoeuvres, l’autre partie n’aurait pas contract\u00e9. Il ne se pr\u00e9sume pas, et doit \u00eatre prouv\u00e9. \u00bb<\/em> \u2014 dol<\/em> is a ground for nullity only when the manoeuvres are such that the other party would clearly not have contracted without them; it is not presumed and must be proved (Cass. 3e civ., 4 Jul. 2024, no. 23-11.532<\/a>). The lower court had failed to draw the consequences of its own finding that the buyer had declared in the deed of sale that he knew the property and had made his own planning enquiries \u2014 a declaration that severely undermined any claim of having been deceived.<\/p>\n\n\n\n For foreign buyers, the practical lesson is significant. Widespread advice to include a clause specifying that the buyer has conducted due diligence<\/a> and is not relying on the seller’s representations may, paradoxically, weaken a future dol<\/em> claim. The Cour de cassation’s analysis confirms that such a declaration, present in the authentic deed, can make it very difficult to argue that the buyer was misled \u2014 even if the seller did, in fact, conceal material information.<\/p>\n\n\n\n Where a sale is annulled for dol<\/em>, the consequences are governed by Articles 1352-3 and 1352-7 of the Code civil<\/em>. The Cour de cassation set an important \\principe in a December 2024 Bulletin ruling: \u00ab si la mauvaise foi du vendeur ne peut le priver de sa cr\u00e9ance de restitution ensuite de l’annulation de la vente, incluant la valeur de la jouissance que la chose a procur\u00e9e \u00e0 l’acqu\u00e9reur, ce dernier, s’il est de bonne foi, ne doit cette valeur qu’\u00e0 compter du jour de la demande. \u00bb<\/em> \u2014 the seller’s bad faith does not prevent him from claiming restitution of the value of the enjoyment the property provided the buyer; however, a buyer in good faith owes that value only from the date of the legal demand (Cass. 3e civ., 5 Dec. 2024, no. 23-16.270<\/a>). This means a successful dol<\/em> claim can result not only in the return of the price but also in compensation for the increase in market value since the original purchase, which the Court in the same case assessed at 21.50 %.<\/p>\n\n\n\n The French estate agency profession is regulated by the loi Hoguet<\/em> of 2 January 1970, which requires agents to hold a professional card, maintain a financial guarantee and carry professional indemnity insurance. Beyond these formal requirements, the law imposes a duty of verification on agents who present buyers to sellers \u2014 and vice versa.<\/p>\n\n\n\n A May 2026 report in The Connexion<\/em> highlighted a case in which a buyer signed a compromis de vente<\/em> for a \u20ac850,000 property in Roubaix, paid a \u20ac10,000 deposit, and then disappeared \u2014 having provided a false address. The sellers sued the agency, arguing that it should have verified the buyer’s financial and professional standing before allowing the sale to proceed. The Lille court ruled in the sellers’ favour in principle, though the quantum awarded fell short of the \u20ac85,000 sought. This case illustrates a growing body of jurisprudence on the agent’s obligation de conseil<\/em> (duty to advise) and obligation de v\u00e9rification<\/em> (duty to verify).<\/p>\n\n\n\n The Cour de cassation has been particularly strict regarding the agent’s right to claim a commission when the sale was not completed. In a published Bulletin decision of March 2023 concerning the droit de pr\u00e9emption<\/em> (right of first refusal) of a tenant, the Third Civil Chamber held: \u00ab le locataire qui exerce son droit de pr\u00e9emption subsidiaire en acceptant l’offre notifi\u00e9e par le notaire, qui n’avait pas \u00e0 \u00eatre pr\u00e9sent\u00e9e par l’agent immobilier mandat\u00e9 par le propri\u00e9taire pour rechercher un acqu\u00e9reur, ne peut se voir imposer le paiement d’une commission rench\u00e9rissant le prix du bien. \u00bb<\/em> \u2014 a tenant exercising a statutory pre-emption right cannot be forced to pay an agent’s commission that increases the cost of the property (Cass. 3e civ., 1 Mar. 2023, no. 21-22.073<\/a>). The principle extends beyond pre-emption cases: an agent is only entitled to a commission when the transaction was effectively concluded through the agent’s involvement, and that conclusion must be evidenced in a single written instrument containing the parties’ undertakings.<\/p>\n\n\n\n The March 2026 decision cited earlier further clarifies the agent’s position. Because the promesse unilat\u00e9rale had lapsed without the beneficiary lifting the option, the sale had not been concluded, and the agent had no right to a commission \u2014 regardless of the fact that all conditions had been fulfilled before expiry. The Court also held that the agent had failed to prove fraudulent collusion between the promettant and a third-party buyer who later acquired the property, and thus the agent could not claim damages for having been deprived of its commission.<\/p>\n\n\n\n For foreign buyers, two practical points emerge. First, an agent who fails to verify a counterparty’s identity and solvency may bear partial liability if the transaction collapses because of that failure \u2014 but establishing that liability requires proof of fault, causation and damage, which is often easier to plead than to prove. Second, where a buyer disappears after signing, a seller’s recourse is primarily against the defaulting buyer under the contractual penalty clause, not against the agent, unless specific conduct by the agent can be shown to have caused or facilitated the loss.<\/p>\n\n\n\nI. The Compromis de Vente: A Binding Commitment, Not Just a Reservation<\/h2>\n\n\n\n
A. Legal Nature: Promise and Peril Under Articles 1583 and 1589<\/h3>\n\n\n\n
B. The Deposit, Penalty Clauses and Conditions Suspensives<\/h3>\n\n\n\n
II. Fraud, Misrepresentation and Agent Liability in French Real Estate Transactions<\/h2>\n\n\n\n
A. Seller Fraud: Dol and R\u00e9ticence Dolosive<\/h3>\n\n\n\n
B. Estate Agent Liability: Verification Duties and Commission Disputes<\/h3>\n\n\n\n