Mediation and Arbitration in Spain: ADR as Alternative to Court Proceedings (2026)

Alternative Dispute Resolution (ADR) in Spain

Alternative Dispute Resolution (ADR) encompasses out-of-court mechanisms for resolving disputes without resorting to ordinary judicial proceedings. In Spain, the main mechanisms are mediation and arbitration, each governed by specific legislation.

Civil and Commercial Mediation (Law 5/2012)

Legal Framework

Law 5/2012, of 6 July, on mediation in civil and commercial matters (transposing Directive 2008/52/EC) is the foundational statute. It excludes matters of public policy, criminal law, and consumer disputes (which have their own dedicated system).

Key Features of Mediation

• Voluntariness: no party can be compelled to mediate (except for a mandatory prior information session in certain cases; Law 1/2000, Ley de Enjuiciamiento Civil (Civil Procedure Act, "LEC"), art. 414.1, as amended by Royal Decree-Law 6/2023)
• Confidentiality: communications made during mediation may not be used in subsequent judicial proceedings (art. 9, Law 5/2012)
• Mediator neutrality: the mediator does not issue rulings or impose solutions
• Impartiality: the mediator must have no interest in the outcome

Procedure

1. Application for mediation (in person or electronically)
2. Information session (the mediator explains the process)
3. Mediation sessions (as many as needed, until an agreement is reached or the process is exhausted)
4. Mediation agreement: may be elevated to a public deed (escritura pública) to give it direct enforceability, or formally notarised, in which case it constitutes an enforceable title (art. 25, Law 5/2012)

Effect on limitation and lapse periods (art. 4, Law 5/2012): filing a request for mediation suspends the running of both limitation and lapse periods for the duration of the procedure.

Mandatory Prior Mediation

Royal Decree-Law 6/2023 (procedural reform) introduced, in certain civil proceedings, a mandatory mediation information session as a prerequisite to the admission of a claim (amended arts. 403 and 414 LEC). This does not require the parties to mediate, only to attend the information session.

Arbitration (Law 60/2003)

Legal Framework

Law 60/2003, of 23 December, on Arbitration (Ley de Arbitraje) governs both domestic and international arbitration. It is compatible with the 1958 New York Convention on the Recognition and Enforcement of Foreign Arbitral Awards, ratified by Spain in 1977.

The Arbitration Agreement (Art. 9, Law 60/2003)

The arbitration agreement (arbitration clause) is the parties' agreement to submit to arbitration any disputes that have arisen or may arise from a legal relationship. Requirements:

• Written form: in a contract, by exchange of letters, or by electronic communications
• Arbitrable subject matter: only disputes concerning matters within the parties' free disposal (matters such as civil status, parentage, family law ( except for separation agreements ) and legal capacity cannot be arbitrated)
• Invalidity of the clause: if it is unfair in business-to-consumer (B2C) contracts (CJEU, Case C-168/05)

Arbitration plea (art. 11, Law 60/2003, and art. 39 LEC): if a claim is brought before a court where an arbitration agreement applies, the defendant must raise the arbitration plea when filing their defence; the court will uphold it and dismiss the proceedings.

Types of Arbitration

• Ad hoc: the parties design the procedure themselves
• Institutional: administered by an arbitral institution (CIMA, CAM, CEEI, ICC Spain) under its own rules

Arbitration Procedure

1. Request for arbitration submitted to the institution or designated arbitrator
2. Constitution of the arbitral tribunal: sole arbitrator or panel of 3 arbitrators (as agreed by the parties)
3. Statement of claim and statement of defence
4. Hearings and taking of evidence (the tribunal directs the procedure within the limits set by the Law)
5. Arbitral award (laudo arbitral) (art. 37, Law 60/2003): to be rendered within 6 months of the tribunal's constitution, extendable

The Arbitral Award

The award carries the force of res judicata and is directly enforceable (art. 44, Law 60/2003, read together with arts. 517 et seq. LEC). For compulsory enforcement before the courts, it is presented directly as an enforceable title.

Challenge (arts. 40–43, Law 60/2003): the only available remedy is an action for annulment before the Tribunal Superior de Justicia (High Court of Justice, "TSJ") of the relevant Autonomous Community (time limit: 2 months from notification of the award). The grounds are exhaustive: absence of a valid arbitration agreement, breach of due process, ruling beyond the scope of the agreement, violation of public policy.

An appeal on the merits of the award is NOT available.

Recognition of Foreign Arbitral Awards (New York Convention)

To enforce a foreign arbitral award in Spain, the exequatur procedure must be followed before the Civil Chamber of the Tribunal Supremo (Supreme Court, "TS") ( or the TSJ where the matter is not international ) in accordance with the New York Convention. Refusal is only available on the grounds set out in Article V of the Convention (absence of a valid agreement, breach of due process, public policy).

Comparison: Mediation vs. Arbitration vs. Court Litigation

Conclusion

Mediation is ideal when the parties wish to preserve their relationship and have genuine incentives to reach a settlement. Arbitration is preferable when a binding resolution is needed promptly and with confidentiality, particularly in high-value or international contracts. Lawyers should include well-drafted arbitration clauses and advise clients on the choice of arbitral institution.

Lexiel can draft arbitration clauses, mediation agreements, and award challenge submissions, with references to relevant Tribunal Supremo case law.