Arbitration Consolidation and Joinder in Nigeria under the Arbitration and Mediation Act 2023

Arbitration consolidation and joinder in Nigeria are important considerations for parties managing complex, multi-party projects under the Arbitration and Mediation Act 2023 (AMA 2023). As Nigerian businesses review dispute clauses for infrastructure, energy and construction projects in 2026, the ability to coordinate related proceedings and join additional parties has become a practical commercial concern. This article examines the statutory framework, tribunal powers, drafting issues and procedural considerations relevant to in-house counsel, contract managers and external counsel handling disputes across related contracts.

Executive Summary and Who Should Read This Article

This article examines the AMA 2023 and its implications for consolidation, joinder and multi-contract arbitrations in Nigeria. It is intended for in-house counsel managing project portfolios, contract managers negotiating dispute clauses, and external counsel handling multi-party claims. It explains how the statutory provisions affect contract drafting and tribunal applications, and how careful planning can reduce fragmented proceedings and duplicated costs.

Before issuing a notice of arbitration, review the relevant contracts and dispute resolution clauses. Whether proceedings can be consolidated, an additional party joined, or separate arbitrations maintained will depend on the statutory requirements, the parties’ agreement and any applicable institutional rules. For background on virtual hearings and digital procedure, see the Online Dispute Resolution, Nigeria (background on virtual hearings & ODR) resource.

Quick takeaway for contract drafters

Key Consideration for Contract Drafters

Where a project involves several contracts, multiple parties or a chain of subcontractors and guarantors, arbitration clauses should be drafted to work together. Aligning the seat, governing law and applicable arbitration rules, while addressing consolidation and joinder expressly, can reduce procedural uncertainty. However, contractual provisions must still satisfy the AMA 2023 and the requirements for consent where applicable.

What the AMA 2023 Means for Arbitration Consolidation and Joinder in Nigeria

The Arbitration and Mediation Act 2023 repealed and replaced the former Arbitration and Conciliation Act, modernising Nigeria’s arbitration framework in line with developments in international arbitration, including principles reflected in the UNCITRAL Model Law on International Commercial Arbitration. For consolidation and joinder, sections 39 and 40 are particularly important. Section 39 addresses consolidation and concurrent hearings, subject to the parties’ agreement, while section 40 empowers a tribunal to join an additional party where that party is, prima facie, bound by the relevant arbitration agreement.

Under the former regime, coordinating claims arising from related contracts could be difficult. A single construction or energy project might generate separate arbitrations, leading to duplicated evidence, higher costs and potentially inconsistent findings. The AMA 2023 provides an express statutory basis for consolidation and joinder, but these mechanisms do not eliminate the need to respect party consent and the limits of the tribunal’s jurisdiction.

Statutory Provisions and Primary Sources

The relevant statutory provisions should be checked against the enacted text of the AMA 2023 before being relied upon in pleadings, applications or contract drafting. The Act’s provisions on consolidation and concurrent hearings appear in section 39, while section 40 governs joinder of parties.

Section 39 permits parties to agree to consolidate arbitral proceedings, including proceedings involving different parties where those parties agree. It also permits concurrent hearings on agreed terms. Under section 39(2), a tribunal cannot order consolidation or concurrent hearings unless the parties agree to the order. Section 40, by contrast, empowers the tribunal to join an additional party where that party is prima facie bound by the arbitration agreement. The tribunal may subsequently determine any jurisdictional question arising from its joinder decision.

The Act also introduces an award review tribunal and provides for third-party funding of arbitration. These reforms are relevant to the wider arbitration framework, although they do not themselves determine whether consolidation or joinder is permissible in a particular dispute.

Practical Effect for Multi-Contract Projects

For Nigerian infrastructure and energy projects, coordinated arbitration depends on compatible clauses and compliance with the statutory requirements. A single arbitration involving claims under several contracts may be possible where the relevant agreements and applicable rules permit it. Where the clauses differ, or the necessary consent is absent, the parties cannot assume that related disputes may be combined simply because they concern the same project. Consistent drafting across the contract chain remains essential.

Interaction with Institutional Rules and Ad Hoc Arbitrations

High-value Nigerian disputes may proceed under institutional rules, such as those of the ICC, the LCIA or a domestic arbitral institution, or through ad hoc arbitration. Where institutional rules apply, their provisions on consolidation and joinder must be read alongside the AMA 2023. The relevant rules may impose additional conditions concerning consent, compatibility, timing and tribunal constitution. They cannot simply be assumed to override applicable statutory requirements.

In an ad hoc arbitration seated in Nigeria, the tribunal must consider the AMA 2023 and the parties’ agreement when determining whether consolidation or joinder is permitted. Express drafting is particularly important where the parties intend to coordinate disputes arising from different contracts. Arbitration, mediation, litigation and hybrid dispute resolution arrangements offer different ways to manage related claims; the appropriate approach depends on the contracts, the parties’ agreement and the nature of the dispute.

Tribunal Powers under the AMA 2023: Consolidation, Joinder and Case Management

The AMA 2023 gives arbitral tribunals powers to manage proceedings, but consolidation and joinder are subject to specific statutory conditions. Under section 39, parties may agree to consolidate arbitrations or hold concurrent hearings, including proceedings involving different parties where the necessary agreement exists. A tribunal cannot order either measure without the parties’ agreement. Under section 40, a tribunal may join an additional party where that party is, prima facie, bound by the arbitration agreement giving rise to the arbitration. The tribunal retains the power to determine its jurisdiction after making a joinder decision.

Case management can improve efficiency even where consolidation is unavailable. Within the scope of its authority, a tribunal may establish procedural timetables, coordinate document production and organise evidence to avoid unnecessary duplication. However, these measures cannot be used to circumvent the consent requirement for consolidation or concurrent hearings under section 39, or to extend the tribunal’s jurisdiction beyond the applicable arbitration agreement.

Applying for Consolidation or Joinder

• Establish the legal basis. Identify the relevant arbitration agreements, the connection between the proceedings and the consent required under section 39, or the basis for concluding that the proposed additional party is prima facie bound under section 40.

• Submit a reasoned application. Set out the relevant facts, legal grounds, overlapping issues and relief sought. Follow any applicable institutional rules and procedural directions.

• Notify affected parties. Ensure that the existing parties and any proposed additional party receive the application and a fair opportunity to respond.

• Consider tribunal composition. Address any implications for the appointment and independence of arbitrators, particularly where the proposed arrangement would alter the constitution of the tribunal.

• Obtain a decision. The tribunal determines the application within its statutory authority and the applicable procedural framework. Where consolidation is unavailable, it may consider permissible case management measures instead.

Tribunal Remedies and Procedural Orders

Beyond consolidation and joinder, a tribunal may exercise its available procedural and remedial powers to manage the dispute. Depending on the circumstances and the parties’ agreement, it may determine preliminary issues separately, organise hearings efficiently, issue procedural directions and make appropriate interim measures within its statutory powers. Coordinating the presentation of common evidence can reduce duplication, but a tribunal cannot direct another independent tribunal or suspend separate proceedings over which it has no authority merely to achieve procedural efficiency.

The choice of arbitrator also matters. Experience in multi-party and multi-contract disputes can help a tribunal manage jurisdictional objections, procedural fairness and overlapping claims effectively.

Court Support, Assistance and Limits: Enforcement, Injunctive Relief and Setting Aside

The AMA 2023 provides for court assistance while limiting judicial intervention in arbitral proceedings. Depending on the circumstances, the courts may grant interim measures of protection, assist with aspects of the arbitral process and recognise or enforce awards. Section 5 provides for a stay of court proceedings concerning a matter covered by an arbitration agreement, subject to the statutory conditions. These powers support arbitration without giving courts a general supervisory role over the tribunal’s procedural decisions.

For multi-contract disputes, court involvement may become necessary when a party challenges jurisdiction, seeks interim protection or applies to enforce an award. An award arising from consolidated proceedings is not automatically enforceable merely because consolidation occurred. Recognition and enforcement remain subject to the applicable statutory requirements and any relevant grounds for refusal. Nigeria’s obligations under the New York Convention, together with the AMA 2023, provide the framework for recognising and enforcing foreign arbitral awards. A party seeking to prevent litigation brought in breach of an arbitration agreement should consider the statutory stay procedure and any other relief available under the applicable law.

When to Apply to Court Rather Than the Tribunal

• Urgent interim protection. Consider applying to court where urgent relief is required and the available arbitral mechanisms cannot provide it in time. The availability of court relief depends on the statutory conditions.

• Assistance involving third parties. Court assistance may be necessary where evidence or assets are held by persons outside the arbitration and the tribunal lacks the power to compel their participation.

• Recognition and enforcement. Apply to the competent court where recognition or enforcement of an award is required under the applicable law.

• Stay of court proceedings. Where litigation concerns a matter covered by an arbitration agreement, an application may be made under section 5, subject to its requirements.

• Challenges to an award. A party seeking to challenge an award must follow the applicable statutory procedure, including the provisions governing review by an award review tribunal and subsequent court intervention where available.

Limits and Grounds for Court Intervention

The AMA 2023 restricts challenges to arbitral awards to specified statutory grounds. These include matters such as the invalidity of the arbitration agreement, a party’s inability to present its case, decisions exceeding the tribunal’s jurisdiction, irregularities in the tribunal’s composition or procedure, and conflict with public policy, as applicable under the relevant provision. An award challenge is not an opportunity simply to reopen the merits of the dispute.

In consolidated and joined proceedings, jurisdiction over an additional party and procedural fairness are particularly important. A tribunal must satisfy the statutory conditions for consolidation or joinder and give affected parties a fair opportunity to be heard. Before filing a challenge, counsel should verify the applicable statutory grounds, procedural route and time limits, including any requirements relating to the award review tribunal.

Drafting Effective Multi-Contract and Multi-Party Arbitration Clauses under the AMA 2023

The most reliable way to facilitate consolidation and joinder in Nigeria is to address them when drafting the relevant contracts. Express provisions on consolidation and joinder, a common seat, compatible arbitration rules and a clear dispute escalation procedure can reduce conflicts across a project’s contracts. The objective is consistency: arbitration agreements should be compatible, and the parties should expressly address how related claims may be heard together, subject to the AMA 2023 and any applicable institutional rules.

Clause Examples for Multi-Contract, Construction Chain and Supply Chain Projects

The following drafting approaches illustrate possible arrangements. They are examples for discussion, not bespoke legal advice, and should be adapted to the transaction and reviewed before execution.

• Multi-contract project clause. Provide for disputes under related project agreements to be resolved under the same arbitration rules and at the same seat. Include express consent to consolidation of proceedings arising under two or more agreements, subject to the applicable statutory requirements. This can facilitate a single arbitration where the necessary agreement exists.

• Construction chain clause. Where a project involves a main contract and subcontracts, require compatible dispute resolution provisions throughout the contractual chain. Address expressly whether and on what terms subcontractors, guarantors or indemnifiers may participate in related proceedings. A flow-down provision alone does not automatically bind a third party to the main contract’s arbitration agreement; each relevant agreement must establish the necessary consent or legal basis for participation.

• Supply chain clause. For cross-border supply arrangements, align the arbitration agreements across supply, logistics and ancillary contracts. Specify the seat, applicable rules and intended procedures for consolidation and joinder, including the parties’ consent to multi-party proceedings where appropriate. This reduces the risk of fragmented proceedings, although differences between contracts and jurisdictions may still affect whether claims can be combined.

Negotiation Tips and Alternatives

Where a counterparty will not accept unrestricted consolidation, consider narrower provisions identifying the contracts or types of claims that may be combined. A severability clause can help preserve the arbitration agreement if another contractual provision is invalid, although it cannot cure every defect in the arbitration agreement itself.

The parties may also agree on defined conditions for consolidation and establish procedures for coordinating related disputes. Where joinder of affiliates is resisted, compatible arbitration clauses and advance consent to concurrent hearings may offer alternatives, subject to section 39 of the AMA 2023. Record the parties’ intentions clearly, since the wording of the arbitration agreements is important when determining whether consolidation or joinder is permitted and whether the tribunal has jurisdiction over each party.

Practical Considerations for In-House Counsel Managing Multi-Contract Disputes

When a dispute arises across several contracts, early preparation helps counsel determine whether consolidation or joinder is available and how best to proceed. The process should begin with a review of the relevant agreements and continue through tribunal constitution, procedural applications and enforcement planning.

Pre-Dispute Clause Audit

Maintain a register of arbitration clauses across the project, recording the seat, governing law, applicable rules and provisions on consolidation and joinder. Identify inconsistencies before a dispute arises and, where commercially feasible, address them during contract negotiations or renewals. An early review can reduce jurisdictional objections and procedural disputes when claims emerge.

Initial Steps When a Dispute Arises

• Initial assessment. Review the dispute notices, preserve relevant documents across the affected contracts and involve the legal, commercial and project teams.

• Determine the appropriate procedure. Assess whether consolidation, joinder or separate but coordinated proceedings are legally available. Consider the parties’ agreements, applicable rules and any urgent need for interim relief.

• Prepare applications and constitute the tribunal. Submit the relevant requests in accordance with the applicable procedure, notify affected parties and address any implications for tribunal composition and appointment rights.

• Establish procedural arrangements. Once the tribunal has the necessary authority, seek appropriate directions on timetables, document production, hearings and other case-management matters.

• Plan resources and enforcement. Review the budget, allocate responsibilities for evidence management and consider how any resulting award may be recognised or enforced.

The timing of these steps will depend on the applicable rules, the complexity of the dispute and the availability of the tribunal and parties. They should not be treated as fixed deadlines.

Budgeting and Evidentiary Coordination Across Contracts

Multi-contract disputes require careful evidence management. Prepare a common chronology covering the relevant contracts, identify witnesses whose evidence relates to several claims and coordinate expert instructions where appropriate. Allow for the initial cost of coordination, but assess its likely benefits against the expense of separate proceedings. Consolidation does not always reduce costs, and the potential savings must be weighed against the complexity of the combined arbitration and the risk of additional procedural disputes.

Comparison: Consolidation vs Joinder vs Multi-Contract Arbitration

These mechanisms serve different purposes. Consolidation brings separate arbitrations together; joinder adds a party to an existing arbitration where the legal requirements are met; and multi-contract arbitration involves claims arising under more than one contract being heard in one arbitration. Their availability depends on the arbitration agreements, the AMA 2023 and any applicable institutional rules.

Practical Scenarios and Examples

The following scenarios illustrate how consolidation, joinder and multi-contract arbitration may operate in practice. The appropriate procedure will depend on the relevant agreements and the tribunal’s jurisdiction.

Construction Chain Example

An employer engages a main contractor under a construction contract, and the main contractor appoints several subcontractors under separate agreements. A defect emerges that may involve both the main contractor and a specialist subcontractor.

If the relevant arbitration agreements and statutory requirements permit joinder, the subcontractor may be added to an existing arbitration. Alternatively, the parties may agree to consolidate separate proceedings where the conditions under section 39 are satisfied. This can help avoid duplicated evidence and inconsistent findings on causation.

For future projects, compatible arbitration clauses and express provisions addressing joinder should be included in the relevant subcontracts. A flow-down clause alone does not automatically make every subcontractor a party to the main contract’s arbitration agreement.

Energy and Cross-Border Example

An engineering, procurement and construction (EPC) contract for a power project sits alongside separate equipment-supply and services agreements with different counterparties. A delay dispute affects all three contracts.

Where the arbitration agreements permit claims under the different contracts to be heard together, a multi-contract arbitration may provide an efficient means of resolving the dispute. Consolidation may also be possible if separate arbitrations have already commenced and the requirements of section 39 are met.

If the agreements are incompatible or the necessary consent is absent, the parties may have to proceed separately. Coordination through concurrent hearings may be considered where the parties agree and the statutory requirements are satisfied. For future projects, aligning the dispute resolution provisions across the contract suite can reduce the risk of fragmented proceedings.

Joinder of a Non-Signatory: Jurisdiction and Evidence

A parent company negotiates or performs aspects of a contract through a subsidiary, which is the only named signatory. When a dispute arises, the counterparty seeks to join the parent company, relying on its involvement and control.

The parent’s involvement in the transaction does not, by itself, establish that it is bound by the arbitration agreement. Under section 40 of the AMA 2023, the relevant question is whether the proposed additional party is prima facie bound by that agreement. Depending on the facts and applicable law, issues such as agency, consent or other recognised legal grounds may be relevant.

An application should identify the legal basis for joinder and provide supporting contractual and documentary evidence. Where a group of companies intends to participate collectively in arbitration, the safer approach is to identify the intended parties and obtain their express agreement to the relevant arbitration arrangements at the drafting stage.

Conclusion: Effective Consolidation and Joinder under the AMA 2023

Effective consolidation and joinder begin with careful contract drafting and a clear understanding of the AMA 2023. Counsel should review the relevant arbitration agreements, align dispute resolution provisions across related contracts and assess the statutory requirements before seeking to combine proceedings or add a party. Any clause templates or procedural checklists should be adapted to the transaction and reviewed by qualified counsel before use.

For further reading, consult relevant resources on non-signatories and the group-of-companies doctrine, seat versus venue, arbitration confidentiality, emergency and interim relief under the AMA 2023, and construction arbitration clauses. Where specialist representation is required, a Nigeria dispute resolution practice overview and a reputable lawyer directory may help identify suitable arbitrators and counsel.

The AMA 2023 provides a statutory framework for consolidation and joinder, but these mechanisms remain subject to the parties’ agreements and the applicable legal requirements. Reviewing the contract chain early, securing the necessary consent and addressing procedural issues before a dispute arises can reduce fragmentation, unnecessary costs and jurisdictional challenges. The most effective approach is to plan for coordinated dispute resolution when the contracts are drafted, rather than wait until proceedings begin.

Sources

1. National Assembly of the Federal Republic of Nigeria (NASS)
2. Federal Ministry of Justice, Nigeria
3. Supreme Court of Nigeria
4. Nigerian Bar Association (NBA)
5. UNCITRAL, Model Law on International Commercial Arbitration
6. Nigerian Institute of Advanced Legal Studies (NIALS)