FIDIC Adjudicator Details

International Client Manager

Metehan Caglar  Sonbahar

  Country of residence: United Kingdom

  Citizenship: Turkish


Countries with experience

Other countries with experience:

Global regions

  • East Europe
  • West Europe
  • Middle East
  • Central Asia
  • North Africa
  • Sub Sahara Africa

Languages spoken

  • English

Construction contract experience

  • Construction Contract, 1st Ed (1999 Red Book)
  • Construction Contract, MDB Harmonised Ed, June 2010
  • EPC/Turnkey Contract, 1st Ed (1999 Silver Book)
  • Plant & Design-Build Contract, 1st Ed (1999 Yellow Book)

Consultancy contract experience

  • Client-Consultant Agreement (White Book), 4th Ed 2006
  • Joint Venture (Consortium) Agreement, 1st Ed 1992
  • Sub-Consultancy Agreement, 1st Ed 1992

Specialist contract experience

  • Not applicable - none of the above

CV - Services offered

  • Arbitration
  • Adjudication
  • Contract Expert/specialist
  • Independent expert
  • Expert witness
  • Educational qualifications

Technical expertise

  • Airports - terminals and support
  • Airports - other
  • Building - domestic
  • Building - commercial
  • Building - industrial
  • Building services - other
  • Civil Engineering - Site Investigation
  • Civil Engineering - Foundations and Subsidence/Settlement
  • Civil Engineering - Land Drainage & Dewatering
  • Civil Engineering - Tunnelling and piling
  • Civil Engineering - Retaining Walls
  • Civil Engineering - Dams and reservoirs
  • Construction law
  • Cost engineering (QS)
  • Energy & Power - Fossil Fuel Systems
  • Energy & Power - Hydro Systems
  • Energy & Power - Natural gas and LNG Facilities
  • Infrastructure, Railways, Bridges
  • Marine and ports
  • Metro railway and stations
  • Road and highways - bridges and car parks
  • Road and highways - other
  • Rail - other
  • Water - drainage and sewerage
  • Water - Water Supply
  • Water - Water Treatment
  • Water - Sewerage
  • Water - Sewage Treatment
  • Waste Water - Treatment and Pumping Plant
  • Waster Water - treatment/distribution
  • Other Combined Cyle Power Plants
  • Claims and variations

  • Extension of time
  • Project scheduling

Short summary experiences

Metehan Caglar Sonbahar is the Managing Director with EQUITAS Consulting and committee members of the European Branch of Chartered Institute of Arbitrators and the European External Aid Committee of EFCA. Metehan is dual qualified, having a Master’s Degree in Construction Management and an LLM degree in Construction Law and Arbitration, and is a member of numerous professional institutions.Metehan is a Chartered Civil Engineer with more than 18 years of broad-based construction experience. He has worked extensively across international arbitration and dispute adjudication boards and has acted as quantum and delay expert witness.Metehan has worked on various international projects providing contractual claims and dispute resolution services, project planning, contract drafting and negotiation, delay and disruption analysis and quantum- services. His experience includes buildings, infrastructure, oil and gas, power, highways, water treatment and utilities projects across Europe, Russia and the CIS, Africa, and the Middle East.Metehan has participated in numerous construction disputes and international arbitrations at the ICC, LCIA, DIAC, ITOTAM, DIFC, UNCITRAL and ICSID. He also has experience in various alternative dispute resolution forums including negotiation, dispute resolution boards (DRB), dispute adjudication boards (DAB) and adjudication. Metehan specialises in the FIDIC suite of contracts and has been appointed as a DAB under FIDIC. Metehan has served as an expert in quantum and delay matters, claims management, dispute avoidance, dispute resolution and arbitration support. He has been crossed-examined in arbitral proceedings, including giving concurrent evidence (hot-tubbing). Metehan delivers FIDIC contract claims workshops, training small and large groups of practitioners. He has also published a number of articles on a variety of construction and dispute resolution topics.

Position and experience

Acredited mediator: No
Acredited arbitrator: No

Employment status:
Present position: Managing Director
Previous positions:


  • Arbitration
  • Adjudication
  • Expert Witness
  • Quantum Expert
  • Delay Expert


  • Member of DRBF
  • Member of the Academy of Experts - UK
  • Member of the Chartered Institute of Arbitrators (CIARb)
  • Member of the Chartered Institute of Building (CIOB)
  • Member of the SCL - UK
  • Member of Association of Turkish Civil Engineers
  • Member of Association of Turkish Consulting Engineers and Architects
  • Member of External Actions Committee of EFCA (European Federation of Engineering Consultancy Associations)
  • Committee Member of CIARB European Branch

Qualifications, jurisdiction and discipline

  • FCL Certified Adjudicator
  • Who's Who Legal Listed Expert Witness
  • MSc Construction Management - University of Reading
  • LLM - Construction Law and Arbitration - Robert Gordon University