Construction Without a Deadline: When the Absence of a Cut-Off Date Does Not Void the Sale (Cass. civ. 3e, 4 December 1985)

Imagine: you own a plot of land in Sedan. A developer offers to buy it, but instead of cash payment, he undertakes to build you a house. The deal seems great, until months pass, then years, without a single shovel of earth being turned. Have you signed an empty contract? Can you demand the construction, or are you tied hand and foot?

This is exactly the question the Court of Cassation decided in 1985. A question every owner asks when they accept payment in kind, especially when no timeline is written in black and white. And the judges' answer is more subtle than it seems: the absence of a cut-off date does not render the obligation void, but it creates an uncertainty that the court can resolve.

In this article, we will dissect this little-known but essential decision for anyone selling or buying land with a work-in-kind counterpart. Whether you are in Rethel, Sedan or elsewhere, the principles set out by the Court of Cassation in 1985 are still relevant – and they can save you from a tricky situation.

The Facts: A Story Like Many Others

Mr. X, owner of a plot of land in Rethel, enters into a sale with the company Breguet. The price? Not a sum of money, but the buyer's obligation to build and deliver a house on the sold land. No date fixed in the deed: the buyer was simply to perform 'as soon as possible' – or rather, without any mention of a deadline.

The company Breguet, substituted by another buyer, applies for a building permit. But months pass, and nothing is built. The seller becomes impatient, then worried: what if the obligation to build is merely a legal illusion? He sues the buyer to have a deadline set and to obtain specific performance.

The case goes before the court of appeal, then before the Court of Cassation. The seller argues that the obligation without a date is a purely potestative condition (a condition depending solely on the debtor's will) – however, Article 1174 of the Civil Code (old) declares null and void obligations contracted under such a condition. In other words, if the buyer can unilaterally decide never to build, the contract would be void, and the seller could recover his land.

But the Court of Cassation disagrees. It quashes the appeal judgment that had annulled the sale and refers the case to another court. For the Court, the absence of a cut-off date does not transform the obligation into a potestative condition: it is simply an uncertain term (a future event whose date is unknown, but which will necessarily occur). Moreover, the judge can always fix this term if the parties have not provided for it.

A twist: in the meantime, the company Breguet had not obtained the building permit by a certain date, which complicated matters. The Court of Cassation recalls that obtaining the permit is a necessary step, but the undertaking to build remains valid.

The Reasoning of the Court — Dissected

To understand the decision, one must grasp the fundamental distinction between two legal concepts: the potestative condition and the uncertain term. Article 1174 of the Civil Code (in its version applicable at the time, and now restated in Article 1304-2) provides that 'any obligation contracted under a potestative condition on the part of the person who binds himself is void.' In other words, if the performance of the obligation depends solely on the will of the debtor, the undertaking is stripped of its substance.

Let's take a concrete example: if I promise to pay you 'if I want to', my obligation is void, because it does not bind me to anything. On the other hand, if I promise to pay you 'on the day I have money', the obligation exists, even if the date is unknown: it is an uncertain term.

In the 1985 case, the Court of Cassation applies this reasoning. The buyer undertook to build a house. Building a house is a certain event (it will happen or not, but it depends on the buyer's will only to a certain extent: a permit, financing, a builder are needed…). The Court considers that the obligation is not purely potestative because the buyer cannot by his sole will prevent the construction: he must take steps (apply for a permit, contract with a builder). If nothing is done, the judge can compel the buyer to perform and even set a deadline.

The lower court judges (the court of appeal) had annulled the sale, considering that the absence of a deadline made the obligation illusory. But the Court of Cassation censures them: 'Whereas in so deciding, without examining whether the obligation to build constituted an uncertain term and not a potestative condition, the court of appeal did not give a legal basis to its decision.' In other words, it was necessary to analyse whether the obligation could be enforced by judicial compulsion, rather than declaring it void outright.

This decision illustrates a tendency of judges to save contracts rather than annul them, as long as the parties' intention is clear. It also reminds us that the judge has the power to fill the silence of the parties on deadlines, to prevent a serious obligation from becoming a dead letter.

What This Means for You — Concretely

If you are a seller of land and you accept a house as payment, this decision protects you: even if no deadline is provided, your right to obtain the construction is not lost. You can apply to the court to have a cut-off date fixed and obtain specific performance. Example: an owner in Sedan signs a sale in 2020 with a developer who must build him a 120 m² villa. In 2023, still nothing. Thanks to this decision, he can ask the judge to impose a deadline of 18 months, and even damages if the delay causes harm.

If you are a buyer (the developer or individual who undertakes to build), beware: you cannot hide behind the absence of a date to avoid your obligation. The contract is valid, and you risk being ordered to build under a penalty (a fine per day of delay).

If you are a notary or estate agent, this case law reminds you of the importance of fixing a deadline in the deed. Failing that, the judge will do so, with unpredictable consequences for the parties.

In figures: imagine a plot sold for €150,000, payable by construction of a house valued at €180,000. If the developer does not build for 3 years, the seller can seek in court the forced construction, and possibly damages for loss of enjoyment: €500 per month of delay, i.e. €18,000 over three years. Without this decision, the contract would have been annulled, and the seller would have had to return the land – often a less advantageous solution.

Four Tips to Avoid This Type of Dispute

• Fix a precise deadline in the deed: even an indicative schedule (e.g. 'the house will be delivered within 24 months of obtaining the building permit') avoids any ambiguity. Without a deadline, you leave the door open to judicial interpretation.
• Include a penalty clause: in case of delay, a fixed indemnity (e.g. €100 per day of delay) discourages the buyer from dragging their feet. This clause is valid and regulated by the Civil Code (Article 1231-5).
• Require a performance guarantee: bank guarantee or first-demand guarantee. Thus, if the buyer does not build, you can call on the guarantee without going through a long trial.
• Have the lack of diligence recorded: if the buyer does not apply for the building permit within a reasonable time (e.g. 6 months), send him a formal notice by registered letter. This will allow you, if necessary, to prove his default and obtain termination of the contract or damages.

Further Analysis: Related Case Law and Developments

Before 1985, the Court of Cassation had already distinguished between potestative condition and uncertain term, but mainly in the context of obligations to pay a sum of money (e.g. 'I will pay when I can'). The originality of the 1985 decision is to apply this distinction to an obligation to do something (to build).

Since then, case law has clarified that the judge can fix the uncertain term according to the circumstances: nature of the obligation, reasonable time, conduct of the parties (Civ. 3e, 10 June 1998, no. 96-16.413). In a recent case (Civ. 3e, 12 September 2019, no. 18-18.791), the judges even held that the debtor's total lack of diligence over several years constituted a wrongful non-performance, justifying termination of the contract.

The trend is therefore clear: the courts seek to uphold contracts, but they do not hesitate to sanction abuses. If you are a creditor of an obligation to do something without a deadline, do not wait: act quickly to have a term fixed by the judge.

In Practice: What to Do

1. Check your contract: reread the sale deed. If no date is mentioned for the construction, you are in the situation of the 1985 decision: the obligation is valid, but its term is uncertain.

2. Put the buyer on formal notice: send a registered letter with acknowledgement of receipt asking him to justify the steps taken (permit application, contract with a builder) and to set a schedule.

3. Apply to the court: if the buyer does not respond within 2 to 3 months, you can ask the judge to fix a time for performance and, if necessary, impose penalties. The Judicial Court (formerly TGI) has jurisdiction over property disputes.

4. Anticipate costs: court proceedings cost between €1,500 and €5,000 in legal fees, depending on complexity. But the stakes (building a house) often justify this investment.

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 →