Hidden defects and sales disputes: asserting your rights, whether you are the buyer or the seller
Buying a used vehicle, a property or a piece of equipment, and then discovering a fault — a hidden defect that was not visible at the time of sale: the situation is common and a frequent source of disputes. The law provides several forms of protection, including the warranty against hidden defects. LexInnov assists both buyers and sellers in these disputes.
The warranty against hidden defects
Set out in Articles 1641 to 1649 of the Civil Code, the warranty against hidden defects allows a buyer to take action against the seller where the item is affected by a defect that makes it unfit for its intended use, or so reduces that use that the buyer would not have bought it, or would have paid less for it.
Three conditions must be met. The defect must be hidden — not apparent at the time of sale and not detectable by a reasonably attentive buyer. It must pre-date the sale, even if it only comes to light afterwards. And it must be serious enough to affect the item’s expected use. It is, in principle, for the buyer to establish that these conditions are met, which makes the evidence — often technical — decisive.
The buyer’s remedies
Where these conditions are met, Article 1644 of the Civil Code gives the buyer a choice. The buyer may bring an action to rescind the sale (action rédhibitoire), returning the item and recovering the price. Or the buyer may prefer an action for a price reduction (action estimatoire), keeping the item while obtaining a partial refund. Depending on the circumstances, the buyer may also claim damages, particularly where the seller knew of the defect at the time of sale.
One essential point of caution: the action must be brought within two years of discovering the defect (Article 1648). This time limit, often overlooked, is reason enough to act without delay as soon as a serious fault appears, and to keep all relevant material (the contract, correspondence, invoices, reports).
Don’t confuse the different guarantees
The warranty against hidden defects is distinct from the statutory warranty of conformity, provided by the Consumer Code (Articles L.217-3 et seq.), which applies between a professional and a consumer and rests on different conditions and time limits. To these may be added contractual commercial warranties offered by the seller or the manufacturer. Identifying the right guarantee — and therefore the right legal basis for action — is a decisive step: the same situation may fall under several regimes, which do not offer the same options.
The special case of the professional seller
The situation differs considerably depending on whether the seller is a private individual or a professional. A professional seller is presumed to know of the defects in what they sell: it is therefore harder for them to escape liability, and clauses limiting or excluding the warranty are, as against them, largely deprived of effect. Between private individuals, by contrast, a clause excluding the warranty against hidden defects can be effective — unless the seller acted in bad faith. Establishing the exact status of the parties is thus a preliminary step in any strategy, since it shapes both the legal bases available and the fate of any exclusion clause.
A closer look: automotive expert assessment
In disputes over a used vehicle, the expert assessment is often the decisive element in the case: it is what establishes the reality of the defect, its origin and, above all, the fact that it pre-dates the sale — the three elements at the heart of the warranty against hidden defects.
Several forms of assessment exist side by side. A private expert assessment, carried out at the request of a single party, is quick, but its evidential weight is limited if it is not adversarial. An adversarial private assessment, to which the seller — and, where relevant, the insurers — is invited, offers stronger guarantees. Finally, a court-ordered assessment, directed by the judge and entrusted to an independent expert, carries the greatest weight: it is conducted on an adversarial basis and, while its report does not bind the judge, it is in practice closely followed.
How LexInnov Law Firm can help you
Our firm first helps to characterise the situation: is this genuinely a hidden defect, and on what basis should you act? It then guides the amicable phase (formal notice, negotiation, recourse to an expert assessment) and, if necessary, the court phase. It defends both buyers seeking to assert their rights and sellers facing a claim.
Click here to make an appointment: Maître Simon will analyse your situation and set out the available remedies and the time limits to observe.
Grenoble – 17 September 2026