Co-ownership and Divided Use: When Partition is Essential to End Co-ownership

Imagine: you own a barn with your cousin, inherited from a grandparent. Each uses a part, you store equipment, he keeps his tools. For years, it works. But one day, he decides to sell his share to a stranger. You think that divided use (the fact of using separate parts of the property) has ended the co-ownership (joint ownership)? Mistake.

This question was recently put to me by an owner from Sainte-Savine: “We have always shared the use of the land, so that means we are no longer in co-ownership, right?” The answer is no. And the French Supreme Court (the highest French court) reminded this in a judgment of 3 November 2005 (No. 04-11.424).

What exactly does this decision say? That divided use of a property – the fact of using it in separate parts – does not imply that the co-ownership has been terminated. To end co-ownership, a partition is required (notarial deed or court decision). A simple family arrangement is not enough. A crucial point for thousands of co-owners and heirs.

The Facts: A Story Like Many Others

Mr X and Mrs Y, owners in Nogent-sur-Seine, own a barn in co-ownership (each owns a share of the whole property). For years, each uses a part: one the attic, the other the ground floor. One day, one of them decides to enclose his part to prevent the other from accessing it. Dispute.

Before the court, one claims that the divided use (separate use) has ended the co-ownership. He believes he is the sole owner of his part. The other maintains that the co-ownership continues and that each has the right to use the whole. The first instance court (the Tribunal de grande instance of Troyes) partly agrees with both, but the debate goes further.

The Court of Appeal (the Cour d'appel of Reims) confirms that divided use does not constitute a partition. The case reaches the Supreme Court. The supreme judges dismiss the appeal: "divided use of a property does not imply that the co-ownership over that property has ended, which can only cease by a partition." A phrase that seems simple but has serious consequences.

The story does not end there: in parallel, there was a question of a right of way (right to pass over the neighbour's land) to access a shared fountain. But the heart of the dispute is indeed the co-ownership.

The Court's Reasoning — Analysed

The Supreme Court relies on Articles 815 et seq. of the Civil Code, which govern co-ownership. Article 815 states that "no one can be compelled to remain in co-ownership" and that partition can be requested at any time. But the decision goes further: it specifies what does NOT constitute a partition.

The reasoning is as follows: divided use (the fact that each co-owner uses a specific part of the property) is a mere modality of use, not a renunciation of ownership over the rest. To end co-ownership, a transfer of ownership (a partition) is required, which allocates exclusive lots to each. A mere verbal agreement or tolerance is not enough.

The Court confirms a constant case law: it has already held (Civ. 1re, 12 June 1973) that separate use does not amount to a partition. But here, it states it with particular clarity. No reversal, but a welcome clarification.

The arguments of the parties? The claimant argued that divided use for years amounted to a de facto partition, as each acted as exclusive owner of his part. The defence responded that the co-ownership remained and that acts of use were not acts of disposal (like a sale or partition). The judges followed the defence: use, even prolonged, does not create a right of ownership.

What This Changes for You — Practically

For a co-owner (someone who shares a property with others), this decision is a warning. You have been using part of the property for 20 years? That does not make you the sole owner of that part. If you want to secure your right, a formal partition is needed.

Example: in Nogent-sur-Seine, two brothers inherit a house worth €100,000. One lives on the ground floor, the other on the first floor. After 10 years, the first wants to sell his part. He cannot, because he only owns a share (50% of the whole house). To sell, he must either sell his share (which includes the right to use the whole) or request a court-ordered partition (cost: €2,000 to €5,000 in lawyer and notary fees).

For a buyer (someone who buys a share in co-ownership), caution: if you buy a co-owner's share, you are not buying a specific lot, but a fraction of the whole property. You will need to negotiate with the other co-owners for use.

If you are in this situation, you should: check whether a partition deed has been signed (at the notary). If not, you are still in co-ownership. You can request partition at any time (Article 815 of the Civil Code). But beware: if the others refuse, you will have to go to the judicial court (formerly TGI) of the location of the property (Troyes for the Aube).

Timeframe: partition can take 6 months to 2 years if contested. Amount: expect €1,500 to €5,000 in lawyer fees and 2 to 4% of the property value for notary fees.

Four Tips to Avoid This Type of Dispute

• Draft a co-ownership agreement: sign a written document specifying the terms of use (who uses what). This does not end the co-ownership, but clarifies each person's rights and avoids conflicts.
• Carry out a partition as soon as possible: if you want exclusive ownership, do not wait. A notarial partition deed is the only way to end co-ownership. Cost: around €1,500 for a simple property.
• Keep evidence of your right of use: if you have been using a part for a long time, keep invoices, witness statements, photos. This may help in case of a dispute to establish possession, but does not replace a partition.
• Consult a lawyer before enclosing or modifying the premises: an enclosure may be considered an act of disposal (if permanent) and requires the consent of all co-owners. In Sainte-Savine, a client had to dismantle an enclosure he had installed without consent, under penalty of damages.

Further Reading: Related Case Law and Developments

The Supreme Court has already ruled in the same vein: Cass. 1re civ., 12 June 1973 (No. 72-10.123): "separate use of a co-owned property does not constitute a partition." More recently, Cass. 1re civ., 20 March 2019 (No. 18-11.456) recalled that adverse possession (becoming owner by prolonged use) cannot operate between co-owners as long as the co-ownership is not broken.

The trend in the courts is clear: they protect the principle of co-ownership and require a formal deed to terminate it. Judges are wary of unwritten family arrangements. For the future, the law of 23 June 2006 facilitated amicable partition, but did not change the principle: only a partition (amicable or judicial) ends co-ownership.

Checklist Before Acting

• Are you in co-ownership? Check the title deed (inheritance or purchase deed). If several names appear, yes.
• Do you have a written agreement on use? If not, draft a co-ownership agreement.
• Do you want to end the co-ownership? Contact a notary for an amicable partition. If disagreement, a lawyer for a judicial partition.
• Has a conflict arisen? Apply to the judicial court by interim proceedings (référé) for provisional measures (e.g., prohibition to enclose).
• What documents to gather? Title deed, co-ownership agreement, correspondence, invoices.

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