ADR Notebook HK

ADR · 2025-11-27

Mediation vs Arbitration: Five Key Differences to Help You Choose the Right Dispute Resolution Method

The High Court of the Hong Kong Special Administrative Region reported in its 2024 Annual Report that civil cases awaiting trial for more than 180 days increased by 18% year-on-year, reaching 3,742 cases. This backlog, combined with the phased implementation of the Mediation Ordinance (Cap. 620) amendments effective 31 December 2025—which will expand the categories of mediated settlement agreements eligible for enforcement as court orders—has made the choice between mediation and arbitration a pressing operational decision for businesses and individuals alike. A wrong choice can mean months of procedural delay versus a binding award, or a confidential settlement versus a public record. This article sets out five key differences between mediation and arbitration under Hong Kong law, enabling you to match the forum to the dispute.

1. The Nature of the Outcome: Binding vs. Non-Binding

The most critical distinction between mediation and arbitration lies in the finality of the result. Arbitration produces a binding award enforceable under the Arbitration Ordinance (Cap. 609). Mediation produces a settlement agreement that, while contractually binding between the parties, requires a separate step to become a court order.

Arbitration: A Final and Binding Award

Under section 73 of Cap. 609, an arbitral award is final and binding on the parties. The court’s role is limited to enforcing or, in narrow circumstances, setting aside the award (sections 81–88). This finality is the primary reason parties choose arbitration for commercial contracts—it ends the dispute.

  • Timeline: A typical Hong Kong International Arbitration Centre (HKIAC) administered arbitration, under the 2024 HKIAC Administered Arbitration Rules, takes 9 to 15 months from case filing to final award for a single-arbitrator case.
  • Enforcement: The award can be enforced in Hong Kong as a judgment of the Court of First Instance (section 84 of Cap. 609). For cross-border enforcement, the New York Convention on the Recognition and Enforcement of Foreign Arbitral Awards applies to Hong Kong awards in 172 jurisdictions.

Mediation: A Settlement Agreement, Not a Court Order

Mediation results in a written settlement agreement if the parties reach consensus. This agreement is a contract. If a party breaches it, the other party must sue for breach of contract or apply to the court to enforce the agreement as an order under Order 86 of the Rules of the High Court (Cap. 4A).

  • The 2025 Amendment: The Mediation (Amendment) Ordinance 2025, gazetted on 1 July 2025 and effective 31 December 2025, expands the types of mediated settlement agreements that can be registered with the District Court for enforcement. Previously limited to agreements reached through accredited mediators under the Department of Justice’s mediation schemes, the amendment now covers agreements from any mediation conducted in Hong Kong where the mediator holds a recognised qualification.
  • Practical effect: Starting 1 January 2026, a party can register a mediated settlement agreement directly with the District Court, bypassing a full trial on the underlying dispute. The court will enforce the terms unless there is evidence of fraud, duress, or a material error in the mediation process.

2. Control Over the Process and the Decision-Maker

The second difference concerns who controls the procedure and who decides the outcome. In arbitration, the tribunal controls the process and renders a decision. In mediation, the parties control both the process and the outcome, with the mediator facilitating but never deciding.

Arbitration: Tribunal-Driven Procedure

Under section 47 of Cap. 609, the arbitral tribunal determines the procedure, subject to any agreement between the parties. The tribunal decides the place of arbitration, the language, the rules of evidence, and the timetable. The parties can agree on procedural rules—such as the HKIAC Rules or the UNCITRAL Arbitration Rules—but once appointed, the tribunal has the final say on procedural matters.

  • Choice of arbitrator: Parties can agree on the number of arbitrators (usually one or three) and their qualifications. The HKIAC maintains a panel of over 400 arbitrators from 40 jurisdictions.
  • Hearing format: Arbitration hearings are adversarial. Witnesses give evidence under oath, parties present legal submissions, and the tribunal may issue interim orders or procedural directions. The 2024 HKIAC Rules introduced mandatory case management conferences within 30 days of the tribunal’s constitution.

Mediation: Party-Driven Process

The mediator has no power to impose a decision. The process is facilitative. The mediator’s role is to assist the parties in identifying issues, exploring options, and reaching their own agreement. The parties decide the agenda, the pace, and whether to hold joint sessions or private caucuses.

  • Confidentiality: Section 8 of the Mediation Ordinance (Cap. 620) provides that mediation communications are confidential and inadmissible in court proceedings, subject to limited exceptions (e.g., where disclosure is required by law or to prevent harm).
  • Flexibility: Mediation can be conducted in person, by video conference, or in a hybrid format. The Hong Kong Mediation Accreditation Association Limited (HKMAAL) reported in its 2024 Annual Report that 62% of mediations conducted by its accredited mediators in 2024 used a hybrid format, up from 41% in 2022.

3. Time and Cost: Predictability vs. Flexibility

Arbitration has a defined cost structure and timeline, though both can be significant. Mediation is generally faster and cheaper, but the cost savings depend on whether the parties reach an agreement.

Arbitration: Predictable but Potentially Expensive

The HKIAC’s 2024 cost survey, published in March 2025, reported that the median cost of an HKIAC-administered arbitration (including arbitrator fees, administrative fees, and legal fees) was HKD 1.85 million for disputes valued between HKD 10 million and HKD 50 million. The median duration was 14 months.

  • Cost components: Arbitrator fees (typically charged at hourly rates of HKD 3,000 to HKD 8,000), HKIAC administrative fees (based on a sliding scale under Schedule 1 of the HKIAC Rules), and legal representation fees.
  • Security for costs: The tribunal may order a party to provide security for the other party’s costs (section 56 of Cap. 609). This can add a procedural step and additional cost.

Mediation: Lower Cost, Variable Outcome

The cost of mediation is significantly lower. According to the 2024 HKMAAL Annual Report, the average fee for a single-day mediation (6 hours) conducted by an accredited mediator was HKD 15,000 to HKD 30,000. Legal representation fees are separate but typically lower than in arbitration because the preparation time is shorter.

  • Settlement rate: The Department of Justice’s Mediation Office reported a 72% settlement rate for court-referred mediation in 2024 across the District Court and the Family Court. Parties who settle avoid the cost of a trial or arbitration hearing.
  • No settlement cost: If mediation fails, the parties still bear the mediator’s fee and their own legal costs for the mediation session. They then proceed to arbitration or litigation, incurring additional cost.

4. Confidentiality: Private vs. Public Record

Both mediation and arbitration are private processes, but the degree of confidentiality differs. Arbitration produces a public award in limited circumstances. Mediation communications are protected by statute.

Arbitration: Award May Become Public

The Arbitration Ordinance (Cap. 609) does not contain an express provision requiring confidentiality of the award. The common law position, established in A v B (2015) 18 HKCFAR 49, is that arbitration proceedings are private, but the award may be disclosed to the court for enforcement or setting aside. Once filed with the Court of First Instance for enforcement, the award becomes a public court record accessible on the Judiciary’s e-Law system.

  • Practical guidance: Parties who require absolute confidentiality should include a confidentiality clause in the arbitration agreement, specifying that the award and all proceedings remain confidential. The HKIAC Rules provide for confidentiality in Article 45, but this does not override court enforcement disclosure requirements.

Mediation: Statutory Protection

Section 8 of Cap. 620 provides that mediation communications are confidential and not admissible in evidence in any court or tribunal proceedings. This protection extends to all communications made during the mediation, including oral statements, written submissions, and the mediator’s notes.

  • Exception: The court may order disclosure if necessary for the administration of justice or to prevent harm to a child or vulnerable adult (section 8(2) of Cap. 620). This exception is narrowly applied.
  • Enforcement disclosure: If a mediated settlement agreement is registered with the District Court under the 2025 amendment, the terms of the agreement become part of a court order and are publicly accessible. Parties who require confidentiality should consider whether enforcement by registration is appropriate, or whether to rely on contractual enforcement alone.

5. Enforceability Across Borders: New York Convention vs. No Treaty

For cross-border disputes, enforceability is often the deciding factor. Arbitration awards benefit from the New York Convention. Mediated settlement agreements rely on the Singapore Convention on Mediation, which Hong Kong has signed but not yet ratified.

Arbitration: New York Convention Coverage

Hong Kong has applied the New York Convention since 1977 (as extended by the United Kingdom) and continues to apply it post-handover. Awards made in Hong Kong are enforceable in 172 contracting states. The Court of First Instance will enforce a New York Convention award unless one of the limited grounds for refusal under section 86 of Cap. 609 is established—such as incapacity of a party, invalid arbitration agreement, or breach of natural justice.

  • Statistics: The HKIAC reported in its 2024 Case Statistics that 87% of its 2024 arbitration cases involved at least one party from outside Hong Kong. The top three foreign jurisdictions were Mainland China, the United Kingdom, and Singapore.

Mediation: Singapore Convention Not Yet in Force for Hong Kong

The United Nations Convention on International Settlement Agreements Resulting from Mediation (the Singapore Convention) entered into force on 12 September 2020. Hong Kong signed the Convention on 3 August 2020. However, as of 1 August 2025, the Convention has not been ratified and is not in force in Hong Kong.

  • Current position: Mediated settlement agreements from Hong Kong are enforceable in Singapore Convention states only if the mediation was conducted in a state that has ratified the Convention and the agreement falls within the Convention’s scope. As of 1 August 2025, 55 states have ratified the Singapore Convention, including Singapore, the United States, and China (Mainland China ratified on 1 September 2021).
  • Practical impact: For cross-border enforcement of a mediated settlement, parties should consider whether the counterparty’s jurisdiction is a Singapore Convention state. If not, enforcement requires a breach of contract claim in the relevant jurisdiction, which may be costly and time-consuming.

Closing: Five Actionable Takeaways

  1. Choose arbitration when you need a binding, final decision that is enforceable in multiple jurisdictions under the New York Convention — this is the standard for international commercial contracts.
  2. Choose mediation when the relationship matters, the dispute is about interpretation or performance rather than liability, and you want to preserve confidentiality — the statutory protection under Cap. 620 is stronger than the common law position for arbitration.
  3. Factor the 2025 Mediation Ordinance amendment into your dispute resolution clause — from 1 January 2026, mediated settlement agreements can be registered directly with the District Court, reducing enforcement cost.
  4. Do not rely on the Singapore Convention for cross-border mediation enforcement until Hong Kong ratifies it — for now, include an arbitration backstop clause in mediation agreements where the counterparty is in a non-Singapore Convention state.
  5. Include a clear dispute resolution clause in your contract that specifies the forum, the rules, and the seat — a poorly drafted clause can lead to jurisdictional challenges that delay resolution by 6 to 12 months.

This does not constitute legal advice. Consult a solicitor for your specific case.