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I. Lists and registers of experts

The Ministry of Justice may appoint sworn experts, translators, interpreters as well as legal representatives and business mediators in law enforcement and administrative matters to carry out tasks assigned to them by the judicial and administrative authorities. The experts who have been appointed in this way and subsequently sworn in before a chamber of the Supreme Court of Justice are included in a register available on the website of the Ministry of Justice.

While the register was designed for criminal and administrative matters, it is also used for civil and commercial matters. Courts are not obliged to appoint experts appearing on the register, but they typically do so.

Professionals apply to the Ministry of Justice to be listed on the register. Applications to be included in the register may be submitted to the Ministry of Justice using an online assistant available on (see « Forms / Online services») or the mobile application.A complete file (including a diploma in the field in question, evidence of professional experience, a CV and a criminal records extract) is sent to the Ministry of Justice, which then starts a procedure of verification, including of the trustworthiness of the expert. The ministry decides whether to register the expert by checking the candidate’s qualifications (including degrees in the field and further education) and experience. If admitted to the register, experts have to swear an oath in court.

Once an expert has been designated by the Ministry of Justice and sworn in by a court, the content of the register is published in the Official Journal of Luxembourg. Once registered, experts have no particular obligation. They do not need to send any activity report to the ministry. They are not under any obligation to follow continuous education. The register is updated at regular intervals.

Experts may be revoked if they violate their obligations or professional ethical rules or for other serious reasons. Such reasons occur if they no longer fulfil the qualification requirements, have been found to have neglected their duties or no longer present the trustworthiness required, e.g. they have been found guilty of a crime. An expert is dismissed by decision of the minister after having taken the advice of the public prosecutor and having heard the expert concerned. The dismissal will take the form of a revocation by ministerial decree. The revocation can be challenged before the administrative court. There is no specific code of conduct or ethics applicable to experts. However, ethical or other professional codes that apply to the expert’s specific profession have to be complied with.

II. Experts’ qualifications

Experts have to obtain a certain educational level in their specialised discipline in order to call themselves experts. Such degrees will be essential for them to be entered in the register of experts held by the Ministry of Justice. In order to practise as an expert, experts have neither to be a member of a professional body nor to regularly improve their skills (there is no system of continuous legal education, but experts may follow training on a voluntary basis).

III. Remuneration of experts

The remuneration of experts is fixed by a regulation. In specific cases, especially if the expert’s mission is particularly complex, the court can decide not to apply the legal tariff. In practice, experts usually request the parties to agree to paying a higher amount than the legal tariff. In civil matters, when appointed by the court, one party is obliged to pay the expert in advance. Experts can receive advance payment on their fees that exceed the legal tariff. But at the end of the proceedings, in the judgment on the merits, the court decides who has to bear the final burden of costs. The burden of costs may be shared between the parties. The parties may obtain legal aid with regard to the expert’s remuneration with prescribed rates.

In criminal matters the advance on costs is always paid by the state. The defendant only has to pay the expert’s remuneration if the defendant is sentenced. Experts requested by the prosecutor can also be paid by the state.

IV. Liability of experts

There is no specific rule applicable to the liability of experts. Their action is thus governed by general tort and contractual rules. Such rules do not provide for any cap of liability. There is no obligation to cover the expert’s possible liability via professional indemnity insurance.

V. Additional information about expert proceedings

The appointment of experts is currently regulated by a specific statute, the « Loi modifiée du 7 juillet 1971 portant en matière répressive et administrative, institution d’experts, de traducteurs et d’interprètes assermentés et complétant les dispositions légales relatives à l’assermentation des experts, traducteurs et interprètes ». This law pertains only to criminal and administrative matters. No specific law exists in civil matters.

It should be noted that certain other provisions of the codes of criminal or civil procedure are also relevant, as is the « Loi modifiée du 21 juin 1999 portant règlement de procédure devant les juridictions administratives ».

There are no fundamental differences between the appointment procedures in civil, administrative and criminal matters. However, in criminal matters, the defendant has more extensive rights than in other matters. The vast majority of judicial experts are appointed in preliminary proceedings, prior to trial. At least half of the requests for appointment of an expert are initiated in preliminary proceedings. Appointment of experts during main proceedings is not very common.

1. Appointment of experts

In Luxembourg, judicial experts are appointed by courts or hired by the parties. Only judges can appoint experts with the status of judicial experts, either upon request of the parties or on their own motion. In criminal matters, the investigating judge, the juge d’instruction, often appoints the expert, upon request by either the defendant or the prosecutor. The investigating judge can also appoint the expert on their own motion. Since the decision of the investigating judge is a preliminary decision, the principle of adversarial proceedings does not apply.

In criminal law, there are special rules for co-experts or counter-experts who are at the disposal of the defendant.

In civil, commercial and administrative matters, an expert can be appointed prior to trial if there is a special urgency.

a) Appointment by a court

During the main proceedings, the court appoints a judicial expert when it needs advice on technical matters arising in the course of the proceedings. Courts may do so on request of the parties or on their own motion. Experts must report any conflict of interest with a party.

Pretrial appointment of an expert is possible if the matter is urgent or the expertise is required in view of an upcoming litigation on the merits. The appointment of the expert at this preliminary stage is the sole purpose of the proceedings, requiring that the parties file a specific application. Generally, these proceedings cannot be started without the defendant having the opportunity to be heard by the judge. However, in cases of extreme urgency, judicial experts may be appointed immediately, but in this case the respondent has to have an opportunity to be heard at a later stage.

When applying for the appointment of a judicial expert or commenting on the suggestion by the court to appoint one, the parties may propose names and agree on a specific expert. If a court decides to appoint a judicial expert on its own motion, it should give notice of this to the parties and seek their comments before making such decision. Courts are not obliged to appoint experts appearing on the register of experts, although it is typically their practice.

b) Appointment by the parties

While the parties never appoint judicial experts, the parties can be involved in the appointment of an expert by the court. They might agree on the mission of the expert, on the burden of the costs and even on a specific expert. They would then send a common letter of appointment to the chosen expert. If both parties agree, the judge can allow that expert to be appointed. This happens very often in preliminary proceedings.

2. Procedure (civil)

Once appointed, the judicial expert will convene the parties to discuss the case with them. Experts usually communicate through the lawyers with the parties and also inform the court of the developments. There are no specific rules on how this is managed except for the requirement to respect the principle of adversarial proceedings at all times: each party has the right to express its view on all aspects of the case at all times.

There are two attenuations of this principle. These concern the expert’s examinations of purely factual aspects and investigations invading the private sphere (i.e. medical examination). But in these cases, the expert has to present the results of the investigations to the other parties before finalising their report.

The progress of the expert’s investigations is monitored by the competent court. Where petitioned to that effect, the court can agree that the expert is not sufficiently qualified and designate a different expert. As, in the vast majority of cases, only one expert is appointed, there is no procedure whereby experts meet before trial to narrow down the issues.

a) Expert report

The expert delivers his or her report in writing. There is no particular structure that the expert has to follow in his or her report. The expert has the obligation to execute their mission loyally and in respect of the principle of adversarial proceedings. They have to address all factual questions contained in their mission but are not allowed to answer legal questions. The expert’s mandate will be confined by the court, except for procedures where the expert was appointed by the parties, without the intervention of the judge, where they will address the parties’ concerns.

A preliminary report is not mandatory, but can be produced if required by the circumstances of the specific case. This is especially the case if new questions arise during the execution of the mission or if the parties fail to collaborate with the expert.

Cases where the expert might have to deliver an additional report are rare. This may occur when the expert did not answer all the questions included in their mission or where additional questions arise later on. The court will issue a new order stating the need for additional input and specifying the questions that need to be answered. The parties can make a request for further clarification to the judge. However, in practice, it is more likely that another expert is appointed, depending on the parties’ satisfaction with the first report.

Experts’ reports can be challenged both by the parties’ statements and by a counter-expertise. Courts are not bound by the opinion expressed in expert reports. Case-law states that the court may depart from the expert’s opinion if there are good reasons to do so, i.e. if one or both parties prove the expert to be wrong. Contradictory reports have the same probative value, irrespective of whether the expert was appointed by the court or by the parties. Reports initiated by one party, contradictory reports and reports written without the expert having respected the principle of adversarial proceedings may be produced and discussed in trial, but they do not have the same probative value as reports delivered in respect of this principle.

b) Court hearing

Experts do not need to attend any preliminary hearing. They should attend a hearing in order to answer questions by the court after delivering their report. They will not be cross-examined in court.

Last update: 26/01/2024

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