Written by Nicolas Tang
SIAC consolidation allows two or more related SIAC arbitrations to be combined into a single proceeding before one tribunal. For parties managing related disputes across multiple contracts or transactions, understanding how SIAC consolidation works under the SIAC Rules 2025 can significantly affect cost, speed, and outcome consistency.
This article examines the grounds, procedure, and strategic considerations for both parties seeking and parties opposing consolidation of arbitration proceedings in Singapore.
Consolidation is the process of combining two or more separate arbitrations into a single proceeding. After consolidation, the disputes are heard together by one tribunal, and the tribunal issues a single award resolving all the consolidated claims.
Consolidation is distinct from:
Consolidation results in a single arbitration. The original arbitrations cease to exist as separate proceedings.
Consolidation offers several advantages.
Hearing related disputes together avoids duplication of procedural steps, evidence, and submissions. If a party finds itself commencing arbitration in multiple proceedings on related contracts, consolidation can prevent disputes from being artificially fragmented across separate forums.
Consolidated proceedings reduce arbitrator fees, institutional fees, and legal costs compared to running multiple parallel SIAC arbitrations.
Separate tribunals deciding related disputes may reach inconsistent findings on the same facts. Consolidation eliminates this risk by placing all issues before one decision-maker.
Without consolidation, a party may face multiple proceedings on the same project or transaction, each requiring separate attention and resources. Consolidation prevents disputes from being artificially split across forums.
However, consolidation is not always appropriate. It may delay proceedings that are already advanced, introduce additional complexity, or raise confidentiality concerns where different parties are involved in different arbitrations.
Rule 8 of the SIAC Rules 2025 (7th Edition) governs the consolidation of arbitration proceedings. The SIAC Court of Arbitration may consolidate two or more arbitrations where:
| Ground | Requirements |
| All parties agree | Consent of all parties to all arbitrations |
| Same arbitration agreement | All claims arise under one arbitration agreement |
| Same parties, same legal relationship | Same parties + same legal relationship + compatible agreements |
| Common questions, same transaction | Common question of law or fact + same transaction or series of transactions + compatible agreements |
The SIAC Court of Arbitration must find that the arbitration agreements are “compatible” before ordering consolidation under grounds (c) or (d). Compatibility typically requires:
Minor differences in clause wording do not necessarily make agreements incompatible, but significant divergences may.
Applications for consolidation are decided by the SIAC Court of Arbitration, not by the tribunal. This reflects the institutional nature of the decision: consolidation affects the structure of proceedings, tribunal composition, and administrative arrangements.
An application for consolidation may be made at any time, but timing affects the practicality of consolidation:
A party seeking consolidation submits a Request for Consolidation to SIAC, identifying the arbitrations to be consolidated and the grounds relied upon. SIAC notifies all parties and invites responses. The SIAC Court of Arbitration then decides whether to consolidate.
The SIAC Court of Arbitration‘s decision is administrative, not a ruling on the merits. It does not bind the tribunal on jurisdictional questions that may arise in the consolidated proceeding.
Review the arbitration agreements in each proceeding and assess which ground under Rule 8 applies:
Consolidation is easiest before tribunals are constituted. If one or both arbitrations are well advanced, consider whether consolidation will cause delay and whether the efficiency gains justify any disruption.
A Request for Consolidation should include:
Submit the Request for Consolidation to SIAC. SIAC will notify all parties to all affected arbitrations and set a timetable for responses.
Consolidation is not automatic, and there are legitimate reasons to oppose it.
If you receive notice of a consolidation application, you will have an opportunity to respond. Your response should address:
Opposing consolidation is not without cost. If the SIAC Court orders consolidation over your objection, you will need to participate in the consolidated proceeding. Consider whether opposition is likely to succeed and whether the resources spent opposing consolidation are justified.
If SIAC decides to consolidate (or refuses to consolidate), that decision is final during the SIAC arbitration. The Singapore courts will not step in to review it.
This was confirmed by the Singapore Court of Appeal in DMZ v DNA [2025] SGCA 52. In that case, a party was unhappy with a procedural decision made by the SIAC Registrar. It went to the Singapore High Court, asking the court to overturn the Registrar’s decision. The High Court said it had no power to do so. The party appealed. The Court of Appeal agreed: the courts cannot review SIAC‘s procedural decisions.
Singapore law is designed to let arbitrations run without court interference. The International Arbitration Act and the UNCITRAL Model Law (which applies in Singapore) say that courts can only get involved in specific situations, and reviewing SIAC‘s administrative decisions is not one of them.
The SIAC Rules themselves (Rule 40.2) also say that parties cannot challenge decisions made by the Registrar or the SIAC Court of Arbitration in court, except in limited circumstances (like challenges to arbitrators).
If SIAC grants consolidation and you opposed it, or if SIAC refuses consolidation and you wanted it, you cannot go to court to have that decision reversed.
Your only option is to continue with the arbitration and raise the issue later, after the award is issued. At that stage, you could argue (for example) that the consolidation caused a breach of natural justice that affected the outcome. But this is a high bar, and such challenges rarely succeed.
Make your best case at the consolidation application stage. Present all your arguments and evidence to the SIAC Court of Arbitration. Once the decision is made, you will have to live with it for the duration of the arbitration.
Once the SIAC Court of Arbitration orders consolidation, the separate arbitrations are merged into a single proceeding. Several practical questions arise.
If no tribunal has been constituted in any of the arbitrations, SIAC will proceed to constitute a single tribunal for the consolidated case.
If tribunals have been constituted, the SIAC Court determines which tribunal will hear the consolidated proceeding. The SIAC Court may:
The tribunal in the consolidated proceeding will issue a new procedural timetable, taking into account submissions and evidence already filed in the separate arbitrations. Parties may need to update or supplement their submissions to address all consolidated claims.
Work done in the separate arbitrations (submissions, document production, witness statements) is generally preserved. The tribunal will determine how to integrate this material into the consolidated proceeding.
The tribunal will issue a single award resolving all claims in the consolidated proceeding. The award is binding on all parties.
Understanding the differences between joinder and consolidation in arbitration, as well as the multiple contracts mechanism, is important when deciding which procedural tool to use. These mechanisms serve related but distinct purposes:
| Mechanism | What It Does | When to Use | Result |
| Consolidation (Rule 8) | Combines separate arbitrations into one | When related arbitrations are pending and should be heard together | One arbitration, one award |
| Joinder (Rule 7) | Adds a party to an existing arbitration | When a non-party should be included in an ongoing arbitration | Additional party joined to existing arbitration |
| Multiple Contracts (Rule 6) | Allows claims under multiple contracts to be commenced in one arbitration | When disputes arise under related contracts at the outset | One arbitration from the start |
Consolidation is about combining proceedings. Joinder is about adding parties. Multiple contracts is about structuring a single arbitration to cover multiple agreements.
A party facing related disputes may use more than one mechanism. For example, a party may commence an arbitration under multiple contracts, then later apply to consolidate that arbitration with another pending proceeding.
The ease of consolidation depends significantly on how the arbitration agreements are drafted.
If a transaction involves multiple agreements and the parties anticipate that disputes may need to be resolved together:
If a party wishes to limit the risk of consolidation:
Note that parties cannot unilaterally prevent consolidation if the institutional rules permit it. The drafting can make consolidation more difficult, but the ultimate decision rests with the SIAC Court of Arbitration applying the SIAC Rules.
Consolidation under the SIAC Rules allows related arbitrations to be combined into a single proceeding, promoting efficiency, reducing costs, and avoiding inconsistent outcomes. The mechanism is available where parties agree, where claims arise under the same arbitration agreement, or where compatible agreements and common issues justify combining the disputes.
For parties seeking consolidation, the key is demonstrating that the grounds under Rule 8 are met and that consolidation serves the efficient resolution of the disputes. For parties opposing consolidation, the focus is on incompatibility, prejudice, or the absence of common issues.
Whether you are seeking consolidation or opposing it, the arguments deployed at the application stage are critical. The SIAC Court‘s decision cannot be challenged in court, which makes early preparation and a well-structured application essential.
As a legal firm with experience in SIAC arbitration in Singapore, Farallon Law Corporation advises clients on consolidation strategy, compatibility of arbitration agreements, and the procedural steps involved under the SIAC Rules 2025. Whether the dispute involves related contracts, multiple parties, or complex multi-forum proceedings, our team can assist you in navigating the SIAC consolidation process.
For an arbitration law firm in Singapore with specific experience in SIAC proceedings, please contact Farallon Law Corporation by email or via our contact form.
Farallon Law Corporation
21 Collyer Quay #01-01
Singapore 049320
Farallon Law Corporation
21 Collyer Quay #01-01
Singapore 049320
We are recognized regionally by the world-class quality of legal services that we provide. Rely on our capabilities to help you resolve your legal challenges today.
