Expert Witness Services
Expert Services International can provide expert witness services in Indonesia, particularly in international arbitration under BANI and institutional rules, and cross-border construction disputes.
Indonesian Expert Witness Practice
Expert Services International can provide expert witness services in Indonesia, particularly in international arbitration and cross-border construction disputes. Indonesia operates a civil law system derived from the Dutch colonial legal tradition, and expert evidence in domestic courts is typically provided through court-appointed experts under the Indonesian Code of Civil Procedure.
Law No. 30 of 1999 provides the statutory framework for arbitration and alternative dispute resolution. BANI (Badan Arbitrase Nasional Indonesia) is the principal arbitration institution, and the Construction Services Law 2017 (Law No. 2 of 2017) governs construction industry disputes. In international arbitration, party-appointed experts are accommodated under BANI, ICC and other institutional rules.
Indonesia is a civil law jurisdiction with Dutch colonial legal heritage. Expert evidence in domestic courts is provided through court-appointed experts under the Indonesian Code of Civil Procedure. In international arbitration, party-appointed experts are accommodated under institutional rules.
Expert Evidence Framework
Indonesia's court system comprises District Courts (Pengadilan Negeri), which exercise general jurisdiction over commercial and construction disputes, and Commercial Courts (Pengadilan Niaga), which specialise in commercial and certain specialized matters. Expert evidence is adduced in both forum types, and the admissibility and procedure for expert evidence is governed by the Criminal Procedure Code (KUHAP), which applies by analogy in civil proceedings, and by specific provisions contained in Indonesian procedural law.
A significant development in Indonesian law has been the enactment of Law No. 20 of 2025, which replaces the previous Criminal Procedure Code Law No. 8 of 1981. Law No. 20 of 2025 was signed into law in December 2025 and became effective on 1 January 2026. This new legislation modernises Indonesian criminal procedure and contains provisions relevant to expert evidence, although the precise applicability of these provisions to civil proceedings involving expert evidence is still emerging. The Criminal Procedure Code framework, which applies to expert evidence in Indonesian courts, does not impose specific restrictions on the qualifications or background of expert witnesses. Unlike jurisdictions with formally regulated expert witness codes of conduct, Indonesia permits a broad range of individuals with relevant expertise and knowledge to provide expert evidence, including academic experts, practitioners, professionals and others with specialised knowledge in their respective fields.
One of the distinctive features of the Indonesian framework is that it has not yet developed detailed and comprehensive regulations governing expert qualifications, testimony mechanisms and the duties of expert witnesses. This represents both an opportunity and a challenge in Indonesian expert witness practice. Whilst the absence of formal restrictions allows for flexibility in the selection of experts, it also means that practitioners must be mindful of the developing jurisprudence and the evolving expectations of Indonesian courts as they assess the reliability and admissibility of expert evidence. Expert witnesses providing evidence in Indonesian courts should be cognisant that expectations regarding independence, impartiality and the expert's duty to assist the court, whilst not formally codified in Indonesian rules, are increasingly recognised as fundamental principles in international best practice and are likely to be expected by Indonesian judges.
International Arbitration
Arbitration has become the dominant mechanism for resolving international commercial disputes involving Indonesian parties and disputes involving foreign investment in Indonesia. Law No. 30 of 1999 on Arbitration and Alternative Dispute Resolution provides the legislative framework for arbitration in Indonesia, implementing the UNCITRAL Model Law on International Commercial Arbitration. This legislation establishes a supportive framework for arbitration and provides mechanisms for enforcement of arbitration agreements and recognition and enforcement of arbitral awards.
The Badan Arbitrase Nasional Indonesia (BANI) is the principal arbitration institution in Indonesia and promulgates the BANI Rules for Arbitration. A significant modernisation of the BANI framework has occurred with the implementation of the BANI 2025 Rules, which became effective on 2 January 2025. The BANI 2025 Rules introduce substantial enhancements to the framework for arbitration in Indonesia, including provisions for emergency arbitration, mechanisms for handling multi-party and multi-contract disputes, and enhanced accountability measures for arbitrators. These modernised rules reflect BANI's commitment to aligning Indonesian arbitration practice with international best practice and meeting the needs of commercial parties involved in complex disputes.
Expert evidence in BANI arbitration is governed by the BANI Rules and, in many cases, by the parties' agreement that the tribunal shall have regard to the International Bar Association Rules on the Taking of Evidence in International Arbitration (IBA Rules). Whilst the IBA Rules are not automatically applicable in BANI arbitration, they are widely adopted by BANI tribunals as a practical framework for managing expert evidence efficiently and ensuring consistency with international standards. The IBA Rules on Taking of Evidence provide detailed guidance on the disclosure of expert reports, the conduct of expert testimony, the cross-examination of experts and the appointment of tribunal-appointed experts. Many Indonesian arbitrations conducted under BANI Rules either expressly incorporate the IBA Rules or apply them on a de facto basis as reflecting international best practice.
The Chartered Institute of Arbitrators (CIArb) maintains an East Asia Branch which covers Indonesia and the broader Asia-Pacific region, and has published the Protocol for Party-Appointed Expert Witnesses in International Arbitration, which provides comprehensive guidance on the conduct of party-appointed expert evidence in international arbitration. This Protocol, whilst not mandatory in Indonesian arbitration, provides a framework that many practitioners and tribunals find valuable in structuring expert evidence procedures. Additionally, Supreme Court Regulation No. 3 of 2023 provides further reinforcement of the enforceability of arbitral awards and the supportive approach that Indonesian courts adopt towards arbitration, creating a legislative environment that encourages arbitration as a mechanism for resolving disputes involving construction and infrastructure matters.
Construction Disputes
Indonesia's construction and infrastructure sector is governed by Law No. 2 of 2017 on Construction Services, which was subsequently amended by the Job Creation Law (Law No. 6 of 2023). This legislation establishes the regulatory framework for construction services in Indonesia and encourages the use of alternative dispute resolution mechanisms for resolving construction disputes. The Construction Services Law recognises the importance of dispute boards, adjudication and other ADR mechanisms in addressing disputes efficiently and without disrupting construction activities.
Many major construction contracts in Indonesia utilise international standard forms, particularly the FIDIC (International Federation of Consulting Engineers) conditions of contract, which are frequently used in government-funded infrastructure projects and major commercial developments. Indonesian translations of FIDIC standard forms are readily available and are widely accepted in the Indonesian market. The FIDIC framework includes provisions for Dispute Adjudication Boards (DAABs) and expert determination procedures, and the concept of dispute adjudication boards is explicitly permitted under Indonesian Construction Services Law. This creates a comprehensive framework for the management of expert evidence and dispute resolution in major infrastructure projects, combining the international standard FIDIC framework with Indonesian legislative support for alternative dispute resolution mechanisms.
The Indonesian Government Procurement Policy Agency (LKPP) promulgates model contracts for government procurement that are frequently used in government-funded construction and infrastructure projects. These model contracts are largely derived from FIDIC standard forms and include provisions recognising dispute boards, adjudication and other expert determination mechanisms. The use of government model contracts, FIDIC standard forms and established international contracting frameworks means that Indonesian construction disputes frequently benefit from sophisticated dispute resolution mechanisms that incorporate expert evidence procedures aligned with international practice.
Key sectors within the Indonesian construction and infrastructure market include major infrastructure development projects (ports, highways, railways and power generation), technology infrastructure, mining and mineral extraction projects, and complex joint venture arrangements involving foreign investment and Indonesian contractors. These sectors generate substantial disputes involving quantum claims, delay analysis, contract interpretation and technical matters, and expert evidence is regularly adduced in resolving these disputes.
Contemporary Issues
Indonesian expert witness and arbitration practice is experiencing significant modernisation and development, driven by several important legislative and institutional changes. The implementation of Law No. 20 of 2025 (the new Criminal Procedure Code), effective from 1 January 2026, introduces procedural modernisations that will influence civil practice and the treatment of expert evidence in Indonesian courts. Whilst the full implications of this legislation are still emerging, it represents a significant step forward in modernising Indonesian procedural law and aligning it with contemporary international standards.
The BANI 2025 Rules, effective from 2 January 2025, constitute a substantial modernisation of Indonesia's principal arbitration framework. These rules introduce procedures for emergency arbitration, which allows parties to seek urgent interim relief before the tribunal is constituted. The BANI 2025 Rules also introduce comprehensive procedures for handling multi-party disputes and multi-contract disputes, recognising the complexity of modern commercial disputes that frequently involve multiple parties and contractual relationships. These enhancements align BANI's rules more closely with other major international arbitration institutions and provide improved procedures for managing complex disputes.
Indonesia's government has demonstrated continued commitment to infrastructure investment and development, with substantial programs supporting major infrastructure development projects across the archipelago. This commitment to infrastructure development ensures an ongoing pipeline of construction and infrastructure disputes that will require expert evidence and dispute resolution services. The combination of government infrastructure investment, the increasing professionalism of Indonesian contractors and engineering consultants, and the development of more sophisticated legal and dispute resolution frameworks means that Indonesian disputes are becoming increasingly international in character and aligned with international standards and best practice.
Regional Expertise
Expert Services International can provide services in Indonesian expert witness services, combining knowledge of Indonesian procedural frameworks and legal traditions with technical expertise in construction, infrastructure and engineering disputes. Our practice serves parties involved in construction disputes, infrastructure claims, arbitration proceedings and alternative dispute resolution mechanisms across Indonesia and throughout the Asia-Pacific region.
Whether the dispute is proceeding in Indonesian District Courts, Commercial Courts, BANI arbitration or alternative dispute resolution mechanisms, our team understands the specific requirements and expectations applicable to each forum. We prepare expert reports that comply with applicable requirements and international best practice, we provide testimony capable of withstanding expert and judicial scrutiny, and we participate effectively in expert meetings and concurrent expert procedures designed to narrow technical issues and promote resolution.
Our Expertise
Expert Services International can provide expert witness services to law firms, stakeholders, investors, contractors, principals, engineers and other parties involved in construction and infrastructure disputes in Indonesia and across the Asia-Pacific region. Our expertise spans the full range of quantum, delay, disruption and construction defects issues that commonly arise in construction, resource and infrastructure contracts, and we maintain knowledge of procedural requirements and dispute resolution mechanisms applicable in the region.
Our consultants prepare expert reports that address the procedural and evidentiary requirements applicable in Indonesia, ensuring compliance with relevant codes of conduct and professional standards. We provide expert testimony in litigation, arbitration, mediation, expert determination and adjudication proceedings, and we participate in contemporary expert procedures including concurrent evidence and expert meetings designed to narrow technical issues and promote resolution.
We are experienced in international arbitration conducted under institutional rules including the IBA Rules on Taking of Evidence, the CIArb Protocol for Party-Appointed Expert Witnesses, and the procedural frameworks of leading arbitral institutions. Whether the dispute is proceeding in local courts, international arbitration or statutory adjudication, our team can assist with expert reports, testimony and advisory services of the highest professional standard.
Service Scope
Detailed expert reports addressing quantum claims, delay analysis, construction defects and technical matters in District Courts, Commercial Courts and BANI arbitration. Our reports comply with applicable requirements and international best practice, presenting clear methodology, transparent reasoning and conclusions capable of withstanding expert scrutiny and cross-examination in Indonesian forums.
Providing expert testimony in Indonesian court proceedings, BANI arbitration, alternative dispute resolution mechanisms and expert determination proceedings. Our consultants are experienced in articulating complex technical and financial information clearly and persuasively, remaining composed under cross-examination and adapting their evidence as required by the court or tribunal.
Expert services in BANI arbitration and other international arbitration proceedings, including expertise in the IBA Rules on Taking of Evidence and the CIArb Protocol for Party-Appointed Expert Witnesses. We participate in expert meetings, concurrent expert evidence procedures and tribunal-appointed expert arrangements to clarify technical positions and promote resolution.
Advisory services in construction and infrastructure disputes, including claims analysis, dispute board procedures, adjudication advice and expert determination. We advise on dispute resolution mechanisms under FIDIC contracts, Indonesian government model contracts and other international and domestic frameworks utilised in Indonesian construction projects.
