Parliament votes to reform Luxembourg arbitration law: what you need to know about the new law

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 On 23 March 2023 the Luxembourg Parliament voted to reform and modernise Luxembourg arbitration law through changes to the New Code of Civil Procedure. The new law will take effect after it is published in the Mémorial (Luxembourg Official Journal).

The Luxembourg Parliament voted on 23 March 2023 to reform and modernise Luxembourg arbitration law through changes to the New Code of Civil Procedure. The new law will take effect after it is published in the Mémorial (Luxembourg Official Journal).

Arbitration law has been codified in Luxembourg since the Napoleonic era, but this is the first significant change to the law in many years. This eagerly anticipated reform ensures that Luxembourg’s arbitration law is responsive to the realities of international commerce and the growing demand for efficiency in alternative dispute resolution. Luxembourg’s arbitration law provides parties with options to resolve their dispute in a discrete, efficient and timely fashion while also ensuring recourse to the support of state courts when necessary.  

The new law incorporates elements of French and Belgian law as well as provisions of the UNCITRAL model law on international commercial arbitration, thus bringing the procedural framework applicable to arbitration in line with international standards. In a departure from French law, the Luxembourg law does not distinguish between domestic and international arbitration but rather creates one coherent regime. This choice makes the law well adapted to the realities of arbitration in Luxembourg, which is typically international, and follows the UNCITRAL model that has been widely adopted by other countries in this respect.

Matters excluded from arbitration

The law prioritises giving parties access to arbitration in civil and commercial matters, while expressly excluding certain types of disputes from arbitration. No arbitration agreement may be made concerning the status and capacity of persons. Furthermore, disputes between professionals and consumers, employment disputes and disputes relating to residential leases may not be subject to arbitration even after the end of contractual relations between the parties. Disputes arising from insolvency proceedings may also not be subject to an agreement to arbitrate, although the opening of insolvency proceedings does not prevent the application of existing arbitration agreements or the conclusion of such agreements during the course of the insolvency proceedings[1].


The arbitration agreement – validity and separability

The law broadly upholds the right of parties to have recourse to arbitration, even after proceedings before state courts have already been initiated.

Parties may enter into an arbitration agreement either by concluding an arbitration clause before any dispute arises in relation to their contract(s), or via an agreement to submit an existing dispute to arbitration (known as a compromis). The law formally recognises the separability and autonomy of the arbitration clause, meaning that its validity is not affected by the invalidity of the contract and vice versa. The law formally enshrines the principle of “competence-competence”, meaning the arbitral tribunal is competent to rule on its own jurisdiction over a dispute.

If a dispute that falls within the scope of an arbitration agreement is brought before a state court, the court must decline jurisdiction unless it finds the subject matter of the dispute to be non-arbitrable, or the arbitration agreement to be manifestly null and void, or manifestly inapplicable. The state court may not, however, assert its lack of jurisdiction over a dispute on its own initiative[2].


Intervention by state courts – interim measures and the supporting judge (“juge d’appui”)

Several provisions of the new law give parties the option of requesting the intervention of state courts to support resolution of their dispute throughout the arbitration process. As provided by Article 1227-4, the existence of an arbitration agreement does not preclude a party from applying to a state court for interim measures before the arbitral tribunal is constituted or when the tribunal cannot grant the requested measure, for example in the case of an attachment procedure or a constraint placed on third parties. Furthermore, an application for an interim, provisional or conservatory measure does not imply a waiver of the arbitration agreement.

To facilitate the progression of an arbitration, the law introduces the role of the supporting judge, or “juge d’appui”. Pursuant to Article 1229, the supporting judge may be involved when:

The supporting judge is the president of the District Court designated in the arbitration agreement, or the President of the District Court of Luxembourg in the absence of a designation. The supporting judge plays an important role in resolving difficulties and disputes that may arise during the arbitration. According to Article 1230, their intervention may be requested by a party, the arbitral tribunal or a single member of the arbitral tribunal.

The law gives the supporting judge authority to intervene in disputes involving the tribunal, including:

The supporting judge may also intervene to:

Annulment and enforcement of arbitral awards

For the purposes of enforcement of an arbitral award, Luxembourg law does not distinguish between “international” and “domestic” arbitration awards but rather between arbitral awards rendered in Luxembourg and those rendered abroad. If Luxembourg is the seat of the arbitration, the award is deemed to have been rendered in Luxembourg (Article 1228)[3].

Awards rendered in Luxembourg[4] may be enforced using a simplified procedure:

Before the reform, parties were required to request the setting aside of an award before the district court, a decision which could then be appealed to the Court of Appeal. Given that under the reformed law, requests for annulment go directly before the Court of Appeal, the reform streamlines and accelerates the enforcement process. Dismissal of the action for annulment makes the award or the provisions of the award not censured by the Court of Appeal enforceable (Article 1242).

Awards rendered outside Luxembourg[5] may similarly be enforced in Luxembourg only through an order of exequatur granted by the President of the District Court within the jurisdiction in which the person against whom enforcement is sought is domiciled or resides, or failing this, within the jurisdiction where the award is to be enforced.

The decision on exequatur may be appealed within one month of notification. Insofar as recognition and enforcement is not governed by a treaty (such as the 1958 New York Convention or the ICSID Convention), the Court of Appeal may only refuse enforcement on the grounds enshrined in Article 1246. The first six grounds are the same as the ones that also apply to awards rendered in Luxembourg (Article 1238). However, Article 1246 adds four additional grounds on the basis of which awards rendered abroad may be refused enforcement (fraud; discovery of decisive documents; recognition of documents as false; recognition of testimonies as false after the award).   

As provided in Article 1245, the exequatur order cannot be granted if the award is manifestly affected by one of the grounds for annulment provided for in Article 1246.

Other notable provisions

The reform makes it clear that, unless the parties have agreed otherwise, the arbitral tribunal has the authority to order provisional or conservatory measures and may require parties to provide adequate security to back their requests for such measures (Article 1231-9). The arbitral tribunal may also consent to the intervention of a third party in the proceedings (Article 1231-12).


The reform makes Luxembourg an even more attractive choice as a seat of arbitration. Luxembourg now has a modernised arbitration framework to match its status as a sophisticated, multilingual and multicultural legal centre.

Our expertise

Contact our Arbitration experts for any queries regarding the provisions of the new arbitration law and how they could potentially impact your activities.


[1] Chapitre I, art. 1224 – 1226.

[2] Chapitre II, art. 1227 – 1227-4.

[3] Chapitre VII.

[4] Art. 1233 et seq.

[5] Art. 1245 et seq.

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Luxembourg Newsflash – Parliament votes to reform Luxembourg arbitration law what you need to know about the new law

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