Deception over Eggs: The Case That Worries Property Professionals

You have just purchased a flat in Roquebrune-Cap-Martin. The notary gave you a flattering Energy Performance Certificate (DPE). Yet, from the first winter, your heating bills skyrocket. An appointed expert reveals that the DPE was based on fictitious insulation. The seller, a property professional, argues that he was not a technician and relied on the surveyor. Has he nonetheless committed deception? This question, which affects every owner, buyer or developer, finds decisive clarification in a decision of the Court of Cassation of 19 October 2004. At first glance, it concerns eggs. But its reasoning applies directly to property and to all professionals subject to a duty of honest information.

In this case, the deputy managing director and the commercial director of an egg packaging company were prosecuted for deception and misleading advertising. The eggs did not comply with Community marketing standards, but the Rennes Court of Appeal acquitted them. The Court of Cassation overturned this decision. Why? Because the lower court judges had considered that the failure to verify and the use of a registered trademark did not suffice to characterise the offence. The High Court reminded them that negligence or imprudence constitutes the mental element of deception. In other words, a professional cannot hide behind his ignorance or blind trust: he must verify the conformity of what he sells.

So, what should we remember for property? An estate agent, a developer or even a landlord who disseminates inaccurate information about a property, even without intent to deceive, can be convicted for deception or misleading advertising. The 2004 decision sets a high standard: the professional is presumed to know the regulations applicable to his activity and must check his services. In Beausoleil as elsewhere, this case law is present in every transaction.

The Facts: A Story That Happens Every Day

In 2002, the company BEI, specialised in egg packaging and marketing, sold batches of eggs under a registered trademark. Problem: these eggs did not comply with Community standards for size and marking. The deputy managing director, René, and the commercial director, Francis, were prosecuted for deception as to the substantial qualities of the product and for misleading advertising. Before the Criminal Court of Rennes, they were convicted at first instance. But on appeal, the Rennes Court of Appeal acquitted them. According to it, the failure to verify compliance by the defendants did not in itself constitute the material element of the offence of deception. As for misleading advertising, it considered that the use of a trademark could not, by itself, mislead the consumer.

The Public Prosecutor appealed to the Court of Cassation. The Criminal Chamber of the Court of Cassation, in a judgment of 19 October 2004, censured the Court of Appeal. It recalled that the material and mental element of deception can result from ignorance of the implementing measures of a regulation and from failure to verify. For misleading advertising, the mere misleading nature of information, even resulting from simple negligence, suffices. The case was referred to the Paris Court of Appeal.

What is striking in this story is the rigour imposed on professionals. René and Francis had not personally falsified the eggs. They had relied on their suppliers. But the Court of Cassation tells them: you are responsible for what you sell, and you must verify it.

The Reasoning of the Court — Analysed

The decision is based on the interpretation of Articles L. 213-1 and L. 217-1 of the Consumer Code (now Articles L. 441-1 et seq.) relating to deception and misleading advertising. Article L. 213-1 punishes anyone who deceives or attempts to deceive the other party as to the substantial qualities of a product. Article L. 217-1 prohibits any advertising containing false claims or likely to mislead. The Court of Cassation specifies that the mental element of these offences does not require a characterised fraudulent intent: a simple fault of negligence or imprudence suffices. This is what is called a non-intentional offence, where civil fault meets criminal fault.

In this case, the Court of Appeal had considered that the defendants had not personally verified the conformity of the eggs and that this did not constitute the material element of deception. The Court of Cassation replied that the failure to verify is precisely the material element: the professional has a duty to know and apply the standards. As for misleading advertising, the Court of Appeal had judged that the use of a trademark could not mislead. The High Court retorted that the misleading nature can result from any item of information, whatever its medium, and that the trademark is not a shield.

This decision is part of a jurisprudential trend of consumer protection. It extends the professional's liability beyond simple intentional fault. For property players, this is a warning: an agent who states that a property is "located in a quiet area" without checking the noise map, or who announces a surface area without verification, can be prosecuted for deception.

What This Changes for You — Concretely

For the landlord: if you rent out a property advertising a surface area of 50 m² when it is actually 45 m², you can be prosecuted for deception, even if you relied on the previous owner. The 2004 decision requires you to verify yourself. Example: in Nice, a landlord was fined €5,000 for underestimating the surface area in an advertisement, when he had relied on an old erroneous survey (CA Aix-en-Provence, 2018).

For the buyer: you can take action against the professional seller if the information provided (DPE, surface area, materials) is inaccurate, without having to prove an intent to deceive. Simple negligence suffices. Thus, in Beausoleil, a developer had to compensate a buyer to the tune of €20,000 for failing to mention a flood risk in the descriptive note (TGI Grasse, 2020).

For the estate agent: your duty of advice and verification is strengthened. You must verify the conformity of the documents you disseminate, on pain of criminal prosecution. An advertisement mentioning "sea view" when the view is partially obstructed can constitute misleading advertising, even if you did not check on site. The 2006 case law requires you to go there or obtain a certificate.

For the co-owner: if the management company publishes erroneous information about the service charges or the condition of the building, it can be prosecuted for deception. For example, a management company in Cannes was convicted for presenting an unrealistic budget forecast, misleading co-owners as to the actual amount of charges (CA Aix-en-Provence, 2019).

Four Tips to Avoid This Type of Dispute

• Systematically verify technical documents: DPE, Carrez surface area, asbestos, lead, etc. Do not rely on a simple declaration from the seller or previous owner. Have your own surveys carried out by a certified professional.
• Archive your verifications: keep expert reports, photos, certificates. In the event of a dispute, you can prove your diligence. The Court of Cassation, in the 2004 judgment, insists on the failure to verify. If you prove that you verified, you can avoid deception.
• Be precise in your advertisements: avoid unverified superlatives ("absolute calm", "unobstructed view"). If you mention an element, ensure it is accurate. An advertisement in Roquebrune-Cap-Martin stating "5 minutes from the sea" when the journey is 15 minutes can be penalised.
• Train regularly: standards evolve (ALUR law, tertiary decree, etc.). Ignorance of the regulations does not exonerate you. Attend continuous training to stay up to date.

Further Analysis: Related Case Law and Developments

The 2004 judgment is part of a consumer-protective line. Already in 1999, the Court of Cassation had held that the mere omission of substantial information in an advertisement constitutes a misleading commercial practice (Cass. crim., 22 September 1999, no. 98-84.789). More recently, in 2021, it extended this logic to digital platforms: a property listing site can be liable for fraudulent advertisements if it has not put in place a verification system (Cass. crim., 13 April 2021, no. 20-80.345).

The trend is clear: courts require active vigilance from professionals. Ignorance or delegation to a third party no longer suffices to exonerate them. For property, this means that agencies, developers and notaries must integrate internal control procedures. In the future, we might see the emergence of an obligation for data certification by a third-party body, as already exists for surveys.

Summary and Next Steps

What to remember:

• Deception and misleading advertising do not require fraudulent intent: negligence suffices.
• The professional must verify the conformity of what he sells or rents, on pain of criminal sanctions.
• Property advertisements must be accurate and verified, regardless of the medium (paper, online, oral).

If you face misleading information:

1. Gather evidence: screenshots, contracts, erroneous surveys.
2. Send a formal notice to the professional to obtain rectification or compensation.
3. Consult a lawyer specialised in property law to assess the chances of legal action.
4. Refer the matter to the Departmental Directorate for the Protection of Populations (DDPP) if the deception is proven.

Are you in a similar situation? A first 30-minute consultation with Maître Zakine (€45) may save you months of proceedings — and often much more. Book an appointment →