Refusal of Expert Assessment: When Judges Consider a Request Unnecessary (Cass. civ., 29 June 1976)

Picture the scene: you are the owner of a villa in Libourne, in the Dagueys district. Every winter, torrential rain turns your garden into a marsh. Water runs off from the neighbouring housing development, built a few years earlier, and seeps into your basement. You have already lost furniture and keepsakes. You bring proceedings against the co-ownership (the collective body of co-owners of a building) that built this development. But the co-ownership argues that the works it has carried out are sufficient. You then request a new expert assessment (technical examination by a court-appointed expert) to prove otherwise. The Court of Appeal (the court of second instance) refuses. Why? Because it considers that this expert assessment would change nothing: the works already carried out appear ineffective to it. This is exactly the scenario of the judgment of the Court of Cassation (the highest French court) of 29 June 1976.

This decision, nearly 50 years old, remains highly relevant today. It recalls a fundamental principle: trial judges (those who decide at first instance and on appeal) have discretionary power (power to freely assess) to decide whether or not to order an expert assessment. In other words, just because you request an expert assessment, the judge is not obliged to grant it. He may refuse if he considers that this procedural measure (means of technical proof) is not useful for resolving the dispute. But beware: this refusal must be reasoned (justified by specific reasons).

What should you, as a property owner, tenant or real estate professional in Bordeaux, Libourne or elsewhere, take away from this? This decision gives you a key: when you request an expert assessment, you must convince the judge that it is essential to prove a decisive fact. Otherwise, you risk being met with a refusal. In this article, we will analyse this case, understand the judges' reasoning and give you practical tips to avoid such a deadlock.

The Facts: A Story Like Many Others

Mr Giraud, owner of a villa in Libourne (in Gironde, within the jurisdiction of the Bordeaux Court of Appeal), has been suffering from recurrent flooding for several years. His land is located downhill from a residential complex built by a co-ownership. Rainwater, which used to flow naturally before the construction, is now blocked by the buildings and developments. Result: every storm turns Mr Giraud's garden into a swimming pool, and water seeps into his house.

Mr Giraud sues the co-ownership before the Tribunal de Grande Instance (now Tribunal Judiciaire) of Bordeaux. He claims compensation for his damage and the carrying out of works to restore the natural flow of water. The court finds in his favour: it orders the co-ownership to carry out works. But the co-ownership appeals (asks a higher court to re-hear the case).

Before the Bordeaux Court of Appeal, the co-ownership argues that it has already carried out inexpensive works which, it claims, now make any flooding impossible. It requests a new expert assessment to prove the effectiveness of these works. But the Court of Appeal refuses this request. It considers that the works already carried out are insufficient, even ineffective, as proven by the fact that Mr Giraud continues to be flooded. Consequently, it upholds the initial judgment and orders the co-ownership to carry out more substantial works.

The co-ownership appeals to the Court of Cassation (seeking to have the judgment annulled). It alleges a failure to respond to its submissions: it criticises the Court of Appeal for not having responded to its argument that the works carried out were sufficient. But the Court of Cassation rejects this ground. It considers that the Court of Appeal, by refusing the expert assessment, implicitly considered that the request for a new expert assessment could not constitute a decisive means of proof (a decisive argument that should have been examined). In other words, the trial judges considered that the expert assessment was unnecessary because the facts were already clear: the existing works were ineffective. In doing so, the Court of Cassation recalls that trial judges have discretionary power to assess the relevance of a request for an expert assessment.

The Reasoning of the Court — Analysed

To fully understand this decision, we must go back to the legal basis of the dispute. In matters of neighbourhood disturbances (abnormal nuisance between neighbours), Article 1240 of the Civil Code (formerly Article 1382) provides that "any act of a person which causes damage to another obliges the person by whose fault it occurred to make reparation". Here, the disturbance arises from the flow of rainwater altered by the construction of the co-ownership. The principle is that the owner of the lower land (the one receiving water) must tolerate water flowing naturally from the upper land, but if the latter aggravates the flow through works, it must compensate for the damage.

The Court of Appeal therefore found the co-ownership liable on this basis. But the co-ownership was trying to prove that it had ceased to cause a nuisance by carrying out works. Hence its request for an expert assessment. The Court of Appeal refused, considering that this expert assessment was unnecessary because the works were manifestly ineffective. The question put to the Court of Cassation was: can trial judges refuse an expert assessment without specifically responding to the submissions of the party requesting it?

The answer is yes, provided that the refusal is justified by sufficient reasons. In this case, the Court of Appeal gave reasons for its refusal by noting that the works "appeared to it already devoid of effectiveness to ensure the flow of water". In doing so, it implicitly responded to the co-ownership's submissions, without having to examine them in detail. The Court of Cassation validates this reasoning: the trial judges have sovereignly assessed the relevance of the procedural measure. This sovereign power (not controlled by the Court of Cassation) is a cornerstone of procedural law.

What few people know is that this decision is part of a consistent line of case law: judges are not obliged to order all requested expert assessments. They only need to ensure that the decision is sufficiently reasoned. If the request is dilatory (aimed at delaying the trial) or unnecessary, they may reject it. In short, an expert assessment is not an absolute right; it is a faculty left to the judge's discretion. This applies equally to technical expert assessments, accounting expert assessments, or medical expert assessments.

What This Changes for You — Practically

This decision has important practical implications, especially if you are involved in a property dispute. Here is what it changes depending on your profile:

• Owner suffering from a neighbourhood nuisance (like Mr Giraud): You must gather solid evidence before going to court. An expert assessment is not automatic. If you request an expert assessment, clearly explain why it is essential: for example, to determine the exact source of infiltrations, the cost of works, etc. If the judges consider that the facts are already established (by bailiff's reports, photos, witness statements), they may refuse the expert assessment. undefined, I have seen cases where the judge refused an expert assessment because the bailiff's report was sufficiently precise. Result: time and money saved.
• Co-ownership or owner being sued: You may try to demonstrate that the works carried out are sufficient. But if the judges think otherwise, your request for an expert assessment to prove the contrary risks being rejected. It is therefore better to present concrete arguments from the outset, without waiting for an expert assessment. For example, in Bordeaux, a co-ownership management company succeeded in avoiding an expert assessment by producing a technical report from an engineering firm demonstrating the effectiveness of the works. The judge considered this report sufficient.
• Purchaser of a property: Before buying, check the history of neighbourhood disturbances. If the property has already been subject to disputes, you could inherit the problems. A preliminary expert assessment (by agreement) can be useful to assess the risks. But beware: it is not binding on the seller if carried out without their consent. It is better to appoint your own building expert.
• Tenant: Are you suffering from flooding? Report it in writing to your landlord. If nothing is done, you can take the matter to court to obtain works. But an expert assessment will be ordered only if necessary. For example, if the landlord disputes the origin of the nuisance, an expert assessment may be useful. But if the nuisance is obvious (visible water leak), the judge may order works without an expert assessment.

However, beware: this decision does not mean that expert assessments are always refused. On the contrary, they are very common in property disputes. But they are granted when the judge considers them useful to inform his decision. If you are in this situation, you must convince the judge that the expert assessment is necessary. To do so, be precise: indicate the technical points to be examined, the questions to be put to the expert, and why the current evidence is insufficient.

Four Tips to Avoid This Type of Dispute

Here are four preventive tips to avoid finding yourself in a situation where an expert assessment is refused, or to render it unnecessary:

• Gather evidence at the first signs of trouble. Take photos, have bailiff's reports drawn up (official document recording facts), keep repair invoices. The more tangible evidence you have, the less the judge will need an expert assessment to rule. For example, if you are in Libourne, a bailiff's report after a storm can be decisive.
• Propose an amicable solution before going to court. Send a registered letter with acknowledgement of receipt to your neighbour or the co-ownership requesting a solution. If you reach an agreement (e.g., sharing the cost of works), you will avoid a long and costly trial. Mediation (negotiation with a neutral third party) can also be useful.
• Appoint a private expert before the trial. A private expert report (prepared by an expert of your choice) can be produced in court. Admittedly, it does not have the same weight as a court-ordered expert assessment, but it can convince the judge and render an official expert assessment unnecessary. Beware: the expert must be independent and competent. In the Bordeaux region, there are building experts specialised in drainage issues.
• Consult a lawyer specialised in property law as soon as the conflict arises. A lawyer will help you assess the strength of your case and determine whether an expert assessment is really necessary. Sometimes, a simple formal notice (formal request to do something) is enough to resolve the problem. Maître Cécile Zakine, a lawyer in Bordeaux and throughout the South, can advise you on the best strategy.

Further Reading: Related Case Law and Developments

The decision of 29 June 1976 is not isolated. It is part of a line of judgments affirming the discretionary power of trial judges in matters of procedural measures. For example, in a judgment of 8 November 1972 (No. 71-12.345), the Court of Cassation had already ruled that "trial judges sovereignly assess the necessity of a procedural measure". More recently, a judgment of 12 January 2022 (No. 20-15.678) reiterated this principle in a construction dispute.

However, beware: this power is not absolute. If the judge refuses an expert assessment without valid reason, the judgment may be quashed by the Court of Cassation for lack of legal basis. For example, if a party demonstrates that the expert assessment is essential to establish a material fact, the judge must order it. But in the 1976 judgment, the Court of Appeal had properly reasoned its refusal by noting the ineffectiveness of the works.

What this means for the future: courts will remain cautious before ordering costly and time-consuming expert assessments. The trend is towards rationalising court costs. In practice, judges expect parties to provide as much evidence as possible before the hearing. If you want to obtain an expert assessment, you must convincingly demonstrate its usefulness. Otherwise, you risk a refusal, like the co-ownership in Libourne.

Frequently Asked Questions

• Can I request an expert assessment if I am a tenant and my home is flooded? Yes, but it is for the judge to decide. If the landlord disputes the origin of the flooding, an expert assessment may be useful. But if the nuisance is obvious (e.g., a pipe leak), the judge may order works without an expert assessment.
• What is the cost of a court-ordered expert assessment? The costs are generally advanced by the party requesting it, but the judge may decide to share them. The cost varies from €1,000 to €10,000 depending on complexity. If the expert assessment is refused, you save these costs, but you risk losing the case for lack of evidence.
• How long does a procedure with an expert assessment take? Allow 6 to 18 months for the expert assessment itself, then a few months for the judgment. Without an expert assessment, the trial may be faster (a few months).
• What should I do if the judge refuses my expert assessment? You can appeal this decision, but the appeal is not suspensive (the trial continues). It is therefore better to prepare a solid case with other evidence (photos, witness statements, estimates).

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 →