Latent Defects: Definition and Rights

Buying a property is often the biggest financial commitment of a lifetime. A few months after the keys are handed over, some buyers discover a reality that nothing suggested during the viewings: leaks behind a freshly painted wall, a roof frame eaten away by dry rot (mérule), a dangerous electrical installation or defective foundations. The question then becomes a blunt one: can the buyer take action against the seller? French law answers with the warranty against latent defects (garantie des vices cachés), an old but remarkably technical mechanism. This guide explains exactly what a latent defect is in real estate matters, the strict conditions that must be met, the remedies open to the buyer and the time limits not to be missed.

Definition of latent defects in real estate law

The warranty against latent defects is found in Article 1641 of the French Civil Code, which gives a precise definition:

The seller is bound by the warranty in respect of latent defects in the thing sold which make it unfit for the use for which it is intended, or which so impair that use that the buyer would not have bought it, or would have paid only a lower price, had he known of them.

In practical terms, a latent defect is a defect affecting the property sold, which was neither visible nor known at the time of the sale, and which seriously compromises its use. Applied to real estate, this definition covers defects that are often invisible to the naked eye during an ordinary viewing: dry rot or termites in the structural timbers, a lack of watertightness of the roof hidden by recent works, structural cracks concealed by a coat of render, soil pollution, a non-compliant septic tank, or drains that are out of use. The case of a particular item of sanitary equipment, the macerator toilet (sanibroyeur) installed without being mentioned in the preliminary sale agreement, and the remedies open to the buyer are examined in our dedicated article.

The logic of this warranty is to protect the buyer against what could not have been anticipated. The seller must deliver a property that is fit for the use legitimately expected of it. Where a serious, concealed defect ruins that expectation, the law rebalances the position in favour of the buyer, even if the seller was unaware of the defect.

Latent defect, apparent defect: the boundary

Article 1642 of the French Civil Code sets an essential limit: The seller is not liable for apparent defects of which the buyer was able to satisfy himself. In other words, what could be seen or guessed at during the viewings gives no right to the warranty. A crack clearly visible on a facade, visible signs of damp on the ceiling, a roof that is plainly dilapidated: these matters fall within the buyer's duty of vigilance.

The difficulty lies in where the line is drawn. A defect is regarded as apparent by reference to what a reasonably attentive buyer, albeit a layperson, could have noticed. A private buyer is not required to dismantle a partition or probe a roof frame. By contrast, the case law is more demanding of a professional buyer in real estate or construction, who is presumed capable of detecting certain defects that a private individual would not see.

The four cumulative conditions of the warranty

To rely on the warranty against latent defects, the buyer must satisfy four conditions. They are cumulative: if one is missing, the action fails. This is where most disputes are decided.

A hidden defect that could not be detected

The defect must not have been apparent at the time of the sale, nor known to the buyer. A defect concealed by cosmetic works, for example new boxing-in hiding a beam attacked by wood-boring insects, meets this condition. Conversely, a defect reported in a technical survey annexed to the deed can no longer be described as hidden: the buyer was aware of it.

Whether a defect is hidden is assessed on the day of the sale. It does not matter that the defect becomes fully apparent months later; what matters is that it could not be perceived at the time of purchase.

A defect existing before the sale

The defect, or at least its origin, must exist before the notarial deed (acte authentique) is signed. A problem arising after the purchase, through normal wear or a new event, is not covered. The nuance is important: it is not necessary for the defect to have appeared before the sale, it is enough that its cause pre-existed.

Take the example of a buyer who discovers, the winter after moving in, rising damp in the ground-floor walls. If the expert report establishes that the absence of a damp-proof barrier in the foundations dated from construction, the pre-existence of the defect is established, even if the phenomenon only appeared after the first heavy rains. The buyer's remedies in this situation are discussed in our article on water ingress and damp in a house.

A sufficiently serious defect

Not every defect will do. Article 1641 requires a defect that makes the property unfit for the use for which it is intended, or that so impairs that use that the buyer would not have bought it or would have offered a lower price. A minor imperfection, a finishing defect or a tolerable nuisance does not cross this threshold of seriousness.

In real estate matters, the case law generally regards as sufficiently serious defects such as a roof frame in danger of collapse, a leaking roof requiring complete renewal, an electrical installation posing a danger to occupants, or structural damp making certain rooms uninhabitable. Seriousness is assessed by reference to the intended use of the property: the same is not expected of a main residence, commercial premises or a barn for renovation sold as such.

A defect unknown to the buyer

The buyer must not have been aware of the defect at the time of the sale. This condition largely overlaps with the hidden nature of the defect, but it focuses on the buyer's personal position. A buyer who purchases with full knowledge, because the seller informed them or because the documents supplied revealed the problem, cannot subsequently rely on the warranty.

The warranty against latent defects and other remedies: not to be confused

The warranty against latent defects is not the only tool available to a disappointed buyer. Several mechanisms coexist and follow different logics.

Fraud (dol), provided for in Articles 1137 and 1138 of the French Civil Code, penalises the seller's deceitful conduct or intentional concealment of decisive information. If the seller knew of the defect and deliberately hid it, for example by masking active cracks just before the viewings, the buyer may act on the basis of a defect in consent and seek annulment of the sale. This route requires proof of an intention to deceive, which is demanding.

The ten-year builder's liability (garantie décennale), arising under Articles 1792 et seq. of the French Civil Code, concerns damage that compromises the structural soundness of the work or renders it unfit for its purpose, within ten years of acceptance of the works. It falls on builders and contractors, not on the seller as such, save in the particular case of a seller after completion of the building.

The obligation to deliver a conforming property, based on Article 1604 of the French Civil Code, covers the situation where the property delivered does not match what was agreed, for example a floor area smaller than that stipulated. It is distinct from a latent defect, which presupposes a property conforming to the order but affected by an intrinsic defect.

Identifying the appropriate legal basis correctly is decisive, because each remedy is subject to its own conditions and time limits. A wrong turn may cause the loss of an otherwise legitimate claim.

Warranty exclusion clauses in sale deeds

Almost all preliminary agreements and sale deeds between private individuals contain a clause releasing the seller from the warranty against latent defects. This stipulation is in principle lawful: Article 1643 of the French Civil Code allows the parties to exclude the warranty, unless the seller knew of the defects.

This is the decisive point. The exclusion clause protects only the seller acting in good faith, that is, one who was genuinely unaware of the defect. Where the buyer shows that the seller knew of the defect and kept silent about it, the clause cannot be relied on against the buyer and the seller is fully liable for the defect. The operation of this clause and its limits are analysed separately in our article on the clause excluding the warranty against latent defects.

The position differs radically depending on the status of the seller:

• Between two private individuals, the exclusion clause operates normally, unless the buyer proves the seller's bad faith.
• Where the seller is a real estate professional, a property dealer (marchand de biens), developer or builder, the case law regards the seller as bound to know of the defects affecting the thing sold. The seller is treated as a seller in bad faith, and the exclusion clause has no effect against the buyer.

For a buyer, reading this clause carefully and understanding its real scope is a step that warrants the advice of a legal professional before signing.

The buyer's rights in the face of a latent defect

Where the conditions are met, Article 1644 of the French Civil Code gives the buyer a choice between two actions. The buyer is free to choose the one that best serves their interests.

The action for rescission (action rédhibitoire) allows the buyer to return the property and have the whole price refunded. The sale is undone: the buyer returns the property and the seller repays the price paid. This route makes sense where the defect is so serious that keeping the property is no longer worthwhile, or where the cost of repairs approaches or exceeds the value of the property.

The action for a price reduction (action estimatoire) allows the buyer to keep the property while obtaining a partial refund of the price. The amount of the reduction is generally determined by expert appraisal, having regard to the cost of the necessary works or the loss in value caused by the defect. It is the most common option in practice where the buyer wishes to keep the home but does not intend to bear the cost of the defect alone.

To these two main actions is added the question of damages, which depends on whether the seller was in good or bad faith. Article 1645 of the French Civil Code provides that a seller who knew of the defects must, in addition to refunding the price, compensate the buyer for the whole of the loss suffered: rehousing costs, ancillary works, loss of enjoyment. Conversely, Article 1646 limits the obligation of a seller in good faith to refunding the price and reimbursing the costs incurred by the sale. The distinction between a seller in good faith and one in bad faith therefore directly determines the extent of compensation.

The time limit to act: two years from discovery

The time limit is the most frequent pitfall. Article 1648 of the French Civil Code requires that the action be brought:

An action arising from latent defects must be brought by the buyer within two years of the discovery of the defect.

The starting point is therefore not the date of the sale, but the date the defect was discovered. A defect revealed five years after the purchase can still be pursued, provided the buyer acts within two years of that revelation. In practice, the date of discovery is fixed at the moment the buyer was able to become aware of the reality and seriousness of the defect, often evidenced by a recorded finding (constat) or a first technical report.

This two-year period is a period for bringing legal proceedings, not merely for making a claim. A letter of claim to the seller does not interrupt the period in the same way as legal proceedings. In practice, starting summary proceedings for the appointment of an expert (référé expertise) is often the safest way to preserve one's rights, as it clearly shows the intention to act while organising the evidence.

Imagine a buyer who discovers signs of dry rot at the start of an autumn. If the buyer delays, engages in repeated amicable exchanges and only applies to the court two and a half years later, the action risks being declared inadmissible, whatever the real seriousness of the defect. Vigilance on this point is imperative.

How to prove a latent defect: the role of the expert report

The burden of proof lies on the buyer. It is for the buyer to establish, consistently, that the defect was hidden, existed before the sale, was serious and was unknown to the buyer. This demonstration almost always rests on a technical expert report.

An out-of-court expert report (expertise amiable), commissioned by the buyer, makes it possible to document the defect and to assess its origin, its pre-existence and the cost of repair. It is a first piece of evidence, but its probative value remains limited where it has not been debated adversarially with the seller.

A court-ordered expert report (expertise judiciaire), ordered by the summary proceedings judge (juge des référés) under Article 145 of the French Code of Civil Procedure, has far greater evidential weight. The appointed expert summons all the parties, inspects the property, collects their observations and files a report that will serve as the basis of the proceedings on the merits. This measure is sought before any dispute, provided there is a legitimate reason to preserve or establish evidence of facts. Starting summary proceedings for an expert within the time limits protects both the evidence and the claim.

Several items support the demonstration of pre-existence and of the hidden nature of the defect:

• the mandatory technical surveys annexed to the deed, which may reveal what had or had not been reported
• bailiff's reports (constats d'huissier) recording the state of the property at the time of discovery
• quotes and reports from contractors describing the nature and age of the defects
• written exchanges with the seller, which may reveal the seller's knowledge of the defect

The quality of the evidence file largely determines the outcome of the dispute. A poorly dated discovery, a non-adversarial expert report or the absence of a recorded finding considerably weakens the buyer's position.

Conclusion: act quickly and on the right basis

The warranty against latent defects is a powerful but demanding instrument. It does not penalise the buyer's disappointment, but a serious, concealed and pre-existing defect that ruins the expected use of the property. Three reflexes determine the success of an action. The first is to date the discovery of the defect rigorously, because the two-year period under Article 1648 of the French Civil Code starts at that moment. The second is to build the evidence without delay, ideally through a court-ordered expert report obtained in summary proceedings, rather than wearing oneself out in amicable exchanges that let time slip away. The third is to choose the right legal basis: latent defect, fraud and ten-year builder's liability are not interchangeable and do not carry the same conditions or the same time limits.

The position that emerges from practice is clear: faced with a serious defect discovered after the purchase, delay is the buyer's enemy. Before starting any negotiation with the seller, have a dated technical report prepared and consult a lawyer to check that your action is not at risk of being time-barred and that it rests on the most protective basis.

Frequently asked questions

What is the time limit for bringing a claim under the warranty against latent defects for a property? The action must be brought within two years of the discovery of the defect, in accordance with Article 1648 of the French Civil Code. This starting point is the moment the buyer becomes aware of the reality and seriousness of the defect, not the date of the sale. To preserve this period, starting court proceedings, in particular summary proceedings for an expert, is safer than a simple amicable claim.

Is the warranty exclusion clause in the sale deed always valid? No. This clause, provided for by Article 1643 of the French Civil Code, protects only the seller in good faith who was genuinely unaware of the defect. If the buyer shows that the seller knew of the defect and concealed it, the clause cannot be relied on against the buyer. Against a professional seller, property dealer or builder, the clause is in principle without effect, because such a seller is presumed to know of the defects of the property.

What is the difference between a latent defect and an apparent defect? An apparent defect is a defect that is visible or detectable by a reasonably attentive buyer during viewings, for example an obvious crack or manifest damp. Article 1642 of the French Civil Code excludes such defects from the warranty. A latent defect, by contrast, is neither visible nor known at the time of the sale. Seriousness and concealment are assessed on the day the deed is signed.

What can the buyer obtain where a latent defect is established? Article 1644 of the French Civil Code gives a choice between two actions. The action for rescission allows the buyer to return the property and recover the whole price. The action for a price reduction allows the buyer to keep the property while obtaining a reduction in price, generally fixed by expert appraisal. If the seller knew of the defect, the buyer may also claim damages under Article 1645.

Does the presence of dry rot or termites amount to a latent defect? It can, provided the four statutory conditions are met. The infestation must have been hidden, have pre-dated the sale, be serious enough to affect the use of the property and have been unknown to the buyer. If a termite survey annexed to the deed reported the risk, the hidden nature disappears. An expert report is generally essential to establish the pre-existence and extent of the damage.

Is an expert report needed to prove a latent defect? In practice, yes. The burden of proof lies on the buyer, who must show the existence, pre-existence and seriousness of the defect. A court-ordered expert report obtained in summary proceedings under Article 145 of the French Code of Civil Procedure offers the best evidential weight, because it is adversarial and enforceable against all parties. An out-of-court expert report can start the file, but its value remains limited if the seller was not involved.

Can one act against the seller if one is a real estate professional oneself? Yes, but the courts are more demanding of a professional buyer, presumed capable of detecting certain defects that a private individual would not perceive. A defect that ought to have been detected by an informed buyer risks being classed as apparent, which excludes the warranty. The assessment nevertheless depends on the nature of the defect and the technical competence actually expected of the buyer concerned.