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What Is Ad Hoc Arbitration?
Ad hoc arbitration is arbitration that the parties run themselves, without an administering institution. No organization such as the ICC or the LCIA manages the case, collects fees, or supervises the award. Instead, the parties and the tribunal control every procedural choice, from the appointment of arbitrators to the timetable for the hearing.
That independence is the method’s greatest strength and its greatest risk. Done well, ad hoc arbitration is faster, cheaper, and precisely fitted to the dispute. Done badly, however, it can stall the moment one party stops cooperating.
This guide explains how ad hoc arbitration works, when it makes sense, and how to draft for it so the process cannot be sabotaged.
Key Takeaways
- Ad hoc arbitration proceeds without an administering institution, so the parties and the tribunal manage the case directly.
- Most ad hoc cases adopt the UNCITRAL Arbitration Rules, which supply a complete procedural framework and a mechanism for appointing arbitrators.
- The absence of institutional fees can reduce costs, but only if both parties cooperate.
- Awards from ad hoc proceedings are enforceable under the New York Convention on the same footing as institutional awards.
- A well-drafted clause naming the seat, the rules, and an appointing authority is the best protection against obstruction.
Ad Hoc Arbitration vs. Institutional Arbitration
In institutional arbitration, a body such as the ICC, the LCIA, SIAC, or the ICDR administers the case under its own rules. The institution appoints arbitrators when the parties cannot agree, handles deposits and fee schedules, and in the ICC’s case even scrutinizes draft awards before they issue. For that service, it charges administrative fees that typically scale with the amount in dispute.
Ad hoc arbitration strips that layer away. The parties gain flexibility and save the administrative fee. In exchange, they take on the tasks the institution would have performed. Consequently, the choice usually turns on two questions: how sophisticated are the parties, and how likely is one of them to obstruct the process?
The model is more common than many assume. For example, the bulk of London maritime arbitration proceeds ad hoc on the LMAA Terms, and a large share of investor-state cases under bilateral investment treaties are conducted ad hoc under the UNCITRAL Rules rather than through ICSID. The Yukos awards against Russia, worth $50 billion, came from an ad hoc UNCITRAL tribunal seated in The Hague with the Permanent Court of Arbitration acting only as registry.
The UNCITRAL Rules: The Backbone of Ad Hoc Arbitration
Parties rarely invent a procedure from scratch. Instead, most ad hoc clauses adopt the UNCITRAL Arbitration Rules, first issued in 1976 and revised in 2010, with expedited provisions added in 2021. The rules cover everything a case needs: commencement, appointment and challenge of arbitrators, written phases, hearings, interim measures, and the form of the award.
Crucially, the rules solve the appointment problem. If a respondent refuses to name an arbitrator, the designated appointing authority steps in. Where the parties never chose one, the Secretary-General of the Permanent Court of Arbitration in The Hague designates an appointing authority on request. As a result, a properly drafted ad hoc clause cannot be blocked simply by silence.
How to Start an Ad Hoc Arbitration
Commencing a case is simpler than most clients expect. Under the UNCITRAL Rules, the sequence looks like this:
- Serve a notice of arbitration. The claimant delivers a notice identifying the parties, the arbitration agreement, the dispute, and the relief sought. The arbitration is deemed to commence on the date the respondent receives it.
- Constitute the tribunal. The parties appoint one or three arbitrators as their clause provides. Furthermore, if either side defaults, the appointing authority completes the panel.
- Hold a first procedural conference. The tribunal fixes the timetable, the exchange of pleadings, and the rules for evidence.
- Exchange written submissions and proceed to hearing. The tribunal then closes the record and deliberates.
- Receive the award. The award is final and binding, subject only to the narrow setting-aside grounds at the seat.
Because no institution supervises the process, the seat of arbitration matters even more than usual. The courts of the seat fill any gaps, for instance by ruling on challenges or granting interim relief under statutes such as the English Arbitration Act 1996 or the U.S. Federal Arbitration Act.
Advantages of Ad Hoc Arbitration
- Lower cost. There are no institutional administrative fees, and arbitrator fees can be negotiated directly, often on hourly rates rather than an ad valorem scale.
- Procedural freedom. The parties can tailor timetables, document production, and hearing formats to the dispute instead of following a standard template.
- Speed in cooperative cases. With no administrative intermediary, a willing pair of parties can move as fast as the tribunal allows.
- Confidentiality by design. The parties can write the exact confidentiality regime they need into the procedural order.
The Risks, and How to Manage Them
The weaknesses of ad hoc arbitration mirror its strengths. Without an institution, an uncooperative respondent has more openings to delay. Fee disputes with arbitrators land on the parties’ desks. Moreover, no one scrutinizes the award for formal defects before it issues, which places extra weight on the tribunal’s diligence.
Each risk has a drafting answer. Adopting the UNCITRAL Rules closes most procedural gaps. Naming a specific appointing authority, such as the PCA Secretary-General or a trusted institution acting in that limited role, defeats appointment deadlock. Finally, choosing a seat with a modern arbitration statute and experienced courts ensures judicial support when the process needs it.
Enforcing Ad Hoc Arbitration Awards
Enforcement is where doubts about ad hoc arbitration should end. The New York Convention of 1958, now ratified by more than 170 states, draws no distinction between institutional and ad hoc awards. Courts in contracting states must recognize and enforce both, subject only to the Convention’s narrow refusal grounds, such as invalid agreement, lack of due process, or conflict with public policy.
In practice, therefore, a well-run ad hoc award enforces exactly like an ICC award. The Yukos enforcement saga, litigated across multiple jurisdictions, proceeded on that footing. What matters is not the presence of an institution but the integrity of the agreement and the procedure that produced the award.
Drafting an Ad Hoc Arbitration Clause
The entire method stands or falls on the clause. A reliable ad hoc arbitration clause specifies:
- the seat of arbitration, which determines the supervising courts and the setting-aside regime;
- the UNCITRAL Arbitration Rules, or another complete ruleset, to govern procedure;
- the number of arbitrators, usually one for smaller disputes and three for complex ones;
- a named appointing authority to break deadlocks;
- the language of the proceedings and the law governing the contract.
Ambiguity in any of these elements invites satellite litigation. Our guides on drafting enforceable arbitration clauses and bulletproof international arbitration clauses cover the details.
When Should You Choose Ad Hoc Arbitration?
Ad hoc arbitration suits experienced commercial parties, disputes where cost control matters, and industries with established self-administered practice, such as shipping and commodities. It also dominates treaty-based investor-state cases outside ICSID. By contrast, institutional administration earns its fee when parties are unequal in sophistication, when obstruction is likely, or when award scrutiny adds valuable insurance.
Our firm advises on both models, from clause design through hearing and enforcement. If you face a dispute under an ad hoc clause, or are negotiating one, contact our office to discuss strategy.
Conclusion
Ad hoc arbitration offers control, economy, and speed to parties prepared to manage their own process. The UNCITRAL Rules supply the procedural spine, the seat’s courts stand behind the tribunal, and the New York Convention guarantees the award travels. Draft the clause carefully, choose the seat wisely, and the absence of an institution becomes an advantage rather than a gamble.
Ad hoc arbitration offers flexibility, but it also places more procedural decisions on the parties themselves. Contact our team to discuss whether an ad hoc or institutional process suits your dispute.
