Notice to quit by a co-owner: why a single owner cannot terminate a lease

Imagine the scene. In Offemont, in the Territoire de Belfort, a building is owned by several brothers and sisters after the death of their parents. One of them, eager to sell or recover the dwelling, decides to serve notice to quit on the tenant in his name alone. He says to himself: 'After all, I am an owner, am I not?' Grave mistake. Because in co-ownership (shared ownership without division of shares), no co-owner acts alone for important decisions such as the termination of a lease.

The question that every owner in co-ownership asks: 'Can I serve notice to quit on the tenant without the agreement of my brothers and sisters, or my co-owners?' The answer is an emphatic no. And this is the case even if you hold 90% of the shares. The Court of Cassation, in a judgment of 8 April 1999 (No. 97-15.706), decided: a notice to quit served by a single co-owner, without the consent of all the others, is devoid of any legal effect. In other words, it is worthless.

This decision, handed down more than twenty-five years ago, remains an absolute reference. It recalls a fundamental principle of civil law: in co-ownership, decisions that go beyond simple administration (such as serving notice to quit) require unanimity. So, how to avoid this trap? And what to do if you are a tenant and receive a notice to quit signed by a single co-owner? Complete analysis.

The facts: a story that happens every day

It all begins with a building located in eastern France, perhaps in Valdoie, a neighbouring commune of Belfort. The Y… family are co-owners of a dwelling let under a lease. On 16 July 1991, one of them, no doubt eager to realise the capital gain, serves on the tenant a notice to quit with an offer to sell (Article 15-II of the Law of 6 July 1989). The tenant, who benefits from a right of pre-emption (priority to purchase the dwelling in case of sale), receives this document in due form.

Except that the other co-owners were not consulted. They did not give their consent. The tenant, perhaps worried about having to leave the premises or to buy at a price he considers too high, challenges the validity of the notice. The case ends up before the Court of Appeal, which annuls the notice. Reason? A single co-owner cannot act for the whole of the co-ownership. An appeal in cassation is lodged by the dissatisfied co-owner.

Before the Court of Cassation, two main arguments are put forward. First, a violation of Article 883 of the Civil Code (now codified in the rules of co-ownership): the notice would be valid because the co-owner was acting as manager of the co-ownership. Second, the unilateral nature of the notice would make it irrevocable: once served, the lessor could no longer withdraw it. But the High Court rejects these arguments. It upholds the reasoning of the Court of Appeal: 'the Court of Appeal, which notes that the notice had been served by one of the co-owners without the consent of all, correctly deduces that this notice could not produce any effect.'

The reasoning of the court — analysed

To understand this judgment, one must grasp the mechanism of co-ownership. When several people own the same property without their shares being materially divided, they are in co-ownership. Each co-owner holds a proportionate share (for example 50%, 25%, etc.), but none has an exclusive right over a specific part of the property. Important decisions – such as serving notice to quit on a tenant, selling, mortgaging – require unanimity (except for exceptions, such as acts of preservation or day-to-day administration).

The Court of Appeal had found that the notice had been served by a single co-owner, without the consent of the others. It deduced from this, correctly according to the Court of Cassation, that this notice was unenforceable against the tenant and the other co-owners. Why? Because a notice to quit is an act of disposition (it terminates the lease, modifies the rights of the tenant). However, Article 815-3 of the Civil Code (formerly 883) provides that acts of disposition require unanimity. A single co-owner cannot bind the others.

The appellant also invoked the unilateral nature of the notice: once issued, it would be irrevocable. The Court of Cassation implicitly responds that an act void from the outset can produce no effect, even if it is unilateral. It does not matter that the lessor wished to 'revoke' his offer: the notice never legally existed. In practice, this means that the tenant can ignore this notice, and the other co-owners can challenge any sale that might result from it.

This judgment is neither a revolution nor a reversal. It confirms a consistent line of authority: for decades, the courts have reminded that co-ownership is a 'constrained partnership' where unanimity is the rule. The novelty? Its application to the field of residential leases, with the 1989 Law. Before, some might have thought that a notice to quit was an act of day-to-day administration, falling within property management. The Court of Cassation puts an end to this ambiguity.

What this changes for you — concretely

For the co-owner: You cannot, alone, serve notice to quit on a tenant. Even if you are the majority owner. Example: you hold 70% of a building in Offemont, your two sisters 15% each. If you want to recover the dwelling for your own use or to sell it, you must obtain their written consent. Without this, the notice is void. And if you sell without their consent, the sale can be annulled. For the tenant: You receive a notice to quit signed by a single co-owner? It is without effect. You can remain in the premises. However, check that the signatory was not authorised by the others (for example, a written mandate). If not, challenge it by recorded delivery letter. For the potential buyer: If you are considering buying a let property, ensure that all co-owners have signed the notice to quit or the promise to sell. Otherwise, you risk ending up with a tenant who refuses to leave or co-owners who challenge the sale.

Let’s put figures on it. In Valdoie, a 70 m² dwelling rents for about €550 per month. If a void notice is given, the tenant can stay for 3 more years (the term of a lease). The owner loses €19,800 in rent if he wanted to sell vacant. Not to mention legal fees (€2,000 to €5,000) for a nullity proceeding. For the residents' committee or managing agent: In a block of flats, if the unit belongs to a co-ownership, the managing agent must verify that all co-owners sign the notices. One missing signature and the tenant stays.

Four tips to avoid this type of dispute

• Obtain a written mandate from all co-owners before any action. Before serving notice to quit, have each co-owner sign a document expressly authorising you to act. This can be a notarised power of attorney or a simple writing (but beware of proof).
• If you are a tenant, demand proof of unanimous consent. In case of doubt, ask the lessor in writing to justify that all owners have approved the notice. If he cannot, the notice is void.
• In case of a sale, have the promise signed by all. If one of the co-owners refuses, the sale is compromised. It is better to resolve the conflict beforehand (partition, auction sale, etc.).
• Consult a lawyer at the first sign of disagreement. A simple letter may suffice to settle matters, but if a co-owner blocks, legal action (a summons for partition or for nullity of the notice) may be necessary.

Further reading: related case law and developments

This 1999 judgment is part of a consistent line. One can cite a judgment of the Court of Cassation of 14 November 2013 (No. 12-27.205): a co-owner cannot alone conclude an agricultural lease. And another of 6 November 2019 (No. 18-21.476): the sale of a co-owned property by a single co-owner is void. The trend is clear: the courts protect unanimity in co-ownership, except for acts of preservation (urgency, avoiding loss of the property).

Since the Law of 23 June 2006 reforming succession and gifts, the rules of co-ownership have become more flexible: a two-thirds majority suffices for certain acts of administration (Article 815-3-1 of the Civil Code). But serving notice to quit on a tenant remains an act of disposition requiring unanimity, unless it can be shown to be an act of day-to-day administration (which is rare). In the future, perhaps the law will evolve to align notice to quit with acts of administration, but for now, caution is advised.

Checklist before acting

• Do I have the consent of all co-owners? Check in writing (email, letter, notarial deed). When in doubt, assume not.
• Was the notice signed by a single co-owner? If yes, it is probably void. Consult a lawyer before reacting.
• What if I am a tenant and receive such a notice? Reply by recorded delivery letter challenging its validity, and remain in the premises. Do not sign anything.
• What if I am a buyer? Require all co-owners to sign the deed of sale and the notice. A lack of unanimity can block the transaction.
• Deadlines to observe: The notice must be given at least 6 months before the end of the lease (1989 Law). If the notice is void, the lease is automatically renewed.

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