Management of Affairs and Written Mandate: Estate Agent Cannot Act Without a Mandate

Imagine: you are a homeowner in Vitrolles, and without having formally instructed them, an estate agent finds you a buyer. The sale goes through, but the agent demands a commission. Can you refuse to pay? The answer is yes, if the agent did not have a prior written mandate. This decision of the Court of Cassation of 22 March 2012 (No. 11-13.000) confirms this.

The question every homeowner asks: "Can an agent charge me for a service I did not order?" The law answers in the negative, except in very limited exceptions. Here, the estate agent attempted to rely on "management of affairs", a legal mechanism that allows a person to act without a mandate on behalf of another, provided that the latter subsequently ratifies the transaction. But the Court of Cassation ruled: this mechanism is incompatible with the Hoguet Law, which requires a prior written mandate for any property transaction.

In plain terms, even if the seller signed the preliminary sale agreement (ratification), the agent cannot claim their commission if they had no written mandate at the time of their intervention. A decision that protects homeowners against abusive practices, but also reminds professionals of the importance of formalising their instructions.

The Facts: A Story That Happens Every Day

Mr and Mrs X, owners of a house in Salon-de-Provence, wish to sell. Without having signed a written mandate with an agency, they are contacted by Sarro Immobilier, which introduces them to a buyer. The couple agrees to sign a synallagmatic promise of sale (preliminary contract) with the buyer, without notifying the agency. The sale is completed, and the agency then claims its commission, arguing that it managed the affair on behalf of the sellers, and that the sellers ratified its management by signing the preliminary contract.

Mr and Mrs X refuse to pay, considering that the agency had no written mandate. The case is brought before the Tribunal de Grande Instance of Marseille, then before the Court of Appeal of Aix-en-Provence. The lower courts rule in favour of the agency, holding that ratification by signing the preliminary contract amounts to acceptance of the management of affairs. But Mr and Mrs X appeal to the Court of Cassation.

The Court of Cassation quashes the appeal judgment. It reminds that Law No. 70-9 of 2 January 1970 (the Hoguet Law) and its implementing decree require a prior written mandate for any property transaction. However, management of affairs presupposes an absence of mandate at the outset. The two regimes are incompatible. The agency, which did not hold a written mandate, cannot therefore rely on management of affairs to claim its commission. Mr and Mrs X are released from any obligation to pay.

The Reasoning of the Court — Analysed

The Court of Cassation relies on Article 1372 of the Civil Code (management of affairs) and the Hoguet Law. The reasoning is as follows: management of affairs is a source of obligations that allows a third party (the manager) to act without a mandate on behalf of another person (the principal), provided that the latter ratifies the management. But this mechanism is subsidiary: it cannot be used to circumvent a law of public policy.

However, the Hoguet Law is a matter of public policy: it requires every property professional to hold a professional card and a prior written mandate to intervene in a transaction. This requirement protects consumers against abusive solicitation and guarantees transparency of fees. Allowing an agent to rely on management of affairs would effectively empty the law of its substance.

The lower courts had held that the sellers' signing of the preliminary contract amounted to ratification of the management. But the Court of Cassation responds that ratification cannot remedy the absence of a prior written mandate, because the law requires a prior mandate, not mere subsequent approval. In other words, management of affairs is incompatible with the mandatory provisions of the Hoguet Law.

This decision confirms consistent case law: the courts are very strict on the formality of the property mandate. It reflects the intention to protect individuals against the practices of unscrupulous agents. An agent who intervenes without a mandate does so at their own risk: they will not be able to claim a commission, even if their service was useful.

What This Means for You — Practically

For seller homeowners: You can refuse to pay a commission to an agent who has no written mandate, even if you have signed the preliminary sale contract. Example: if an agent demands €15,000 commission for a sale of €300,000, you can contest it. But be careful: if you have signed a written mandate, even after the steps have begun, you are bound. The decision does not challenge the validity of a written mandate, but sanctions its absence.

For buyers: You are not directly affected, but if an agent shows you a property without a mandate, be aware that the seller might refuse to pay the agent, which could complicate the transaction. In Salon-de-Provence, I saw a case where the agent had to waive their commission after the seller invoked this decision.

For estate agents: The lesson is clear: never approach clients without a written mandate. Even if you are confident of your success, you risk losing your commission. A mandate must be signed before any service. If you intervene first and obtain a mandate afterwards, you are vulnerable. The case law is inflexible.

For professionals (notaries, lawyers): During a sale, check that the agent presents a written mandate. If not, inform the parties of the risks. This can avoid later disputes.

Four Tips to Avoid This Type of Dispute

• Demand a written mandate before any intervention: Whether you are a seller or an agent, do not start any steps without a signed document stating the duration, fees, and conditions. An oral or tacit mandate is not enough.
• Keep a copy of the mandate: In case of dispute, you will need to prove the existence of the mandate. Keep it safe, preferably with an acknowledgement of receipt.
• Be wary of unsolicited approaches: If an agent contacts you without being asked, politely refuse and do not sign anything without reading the mandate. You are not obliged to pay for an unrequested service.
• In case of dispute, do not pay without advice: If an agent demands a commission without a mandate, consult a lawyer specialising in property law before paying. The 2012 decision gives you a strong argument to refuse.

Further Reading: Related Case Law and Developments

This decision is part of a line of strict rulings on the formality of the property mandate. For example, in a decision of 26 March 2008 (No. 06-19.068), the Court of Cassation had already held that management of affairs could not compensate for the absence of a written mandate. However, some appeal courts had attempted to relax the rule in cases of ratification, but the Court of Cassation firmly corrected them.

Since 2012, the trend has been towards strengthening the obligations of estate agents. The Hoguet Law has been amended several times, but the principle of a written mandate remains unchanged. The courts are increasingly meticulous about form: a mandate without a date, without mention of fees, or signed after the service may be annulled. For homeowners, this is additional protection. For agents, it is a reminder to be rigorous.

This case law may evolve with the digitalisation of transactions, but for now, the paper mandate remains the rule. An electronic mandate signed electronically is valid, provided it complies with the same formalities.

Key Points to Remember

1. An estate agent must have a written mandate before any intervention. Without it, they cannot claim a commission, even if the sale goes through.
2. Management of affairs does not apply to property transactions. You cannot be forced to pay for an unrequested service.
3. If you sign a preliminary sale contract without a mandate, you are not obliged to pay the agent. The signature does not amount to ratification of a non-existent mandate.
4. In case of dispute, do not give in to pressure. Consult a lawyer to assert your rights.

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