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Quantum Expert, Javier Sánchez Llopes, wins Client Choice Award Celebrating our first year in New York Get to know the new Regional Head of Diales in Oceania We are hiring in New York Diales Discusses – Virtual Hearings Diales staff are re-elected to the SCL Council Martin W. J. Smith, Diales Technical Expert, features in Big Project ME Diales launch new Middle East service: Arabic Litigation Support Diales welcomes Adrian Kong in Singapore Mark Wheeler, Head of Diales, to speak at the UK Adjudicators Conference Webinar: The role of Expert Witnesses in construction and engineering disputes Diales Technical collaborate with artist Gerry Judah, to create Drift. Diales open a new office in Madrid Diales announce collaboration with EVRA Consulting (PTY) Ltd (EVRA) Diales welcomes David Merritt to it’s team of experts Diales feature on Leaders League Diales open a new office in New York Diales Technical shortlisted in the British Construction Industry Awards 2020 Head of Diales, Mark Wheeler, is published in Lawyer Monthly. Chris Sunderland joins Diales as our Marketing and Business Development Director Diales Technical feature in photo contest Diales reception, 5th March 2020 COVID-19 UPDATE Diales Sponsor 8th ICC MENA Conference on International Arbitration Construction Claims Dubai – Record Keeping Evaluating Contract Claims, 3rd Edition – Out Now Diales are excited to sponsor the 17th ICC Miami Conference on International Arbitration Diales Sponsor the 7th Biennial Conference on Construction Projects from Conception to Completion How To Avoid Construction Disputes – Maria Fisentzou Diales nominated in Structural Awards 2019 Diales are delighted to announce that Phil Duggan been appointed as Head of Diales for the Middle East Diales are proud sponsors of Asia ADR Week 2019 Diales are pleased to be sponsoring the 5th ICC Asia Conference in Singapore Diales are pleased to be sponsoring the 4th ICC Africa Conference in Lagos this week Diales is proud to be sponsoring the 3rd PAW and to host a conference Diales is delighted to be taking part in the 3rd Kuwait Project Management Conference 2019. Diales is proud to be sponsoring the 7th ICC MENA Conference on International Arbitration Dealing with conflicting pressures – A practical guide Diales Technical are shortlisted for an award. Diales are proud sponsors of the CIArb’s International Arbitration Conference 2018 Flying high! Another Goodwood sculpture success Diales Host Drinks Reception GAR Live Construction Disputes ICC Institute Advanced Training on “Drafting enforceable awards” Should arbitration in investment protections treaties be forsaken? DRBF Conference – Paris, France Diales work with Gerry Judah on a new sculpture – Jacob’s Ladder Diales experts gain professional recognition Diales have two new experts Diales host successful drinks reception Diales are commended at the 2017 Structural Awards Mark Castell is attending the 2017 Dutch Arbitration Day, Amsterdam Independence Day: Why Do Many Experts Fail at Being ‘Independent’? John Mullen is published in the Construction Law Review Diales technical are shortlisted for two awards Diales celebrates five years of dedicated Expert Witness support services ICC 1st European International Arbitration Conference Diales are the lead sponsor of Kuala Lumpur International Arbitration Week

Expert Profile

Phil Duggan

Phil Duggan

Regional Head of Diales (Middle East) - Quantum and Delay Expert


BSc Quantity Surveying
MSc Construction Law and Arbitration

Memberships & Associations


Contract Experience


Presentations & Training

Delivered various FIDIC, NEC, Dealing with Delay and Disruption, Contract Management, and bespoke in-house training.


Process & Industrial

Regional Experience

Asia Pacific
Middle East
United Kingdom

Cross-Examination Experience



  • Quantity Surveyor
  • Over 30 years of engineering and construction projects experience
  • Specialist in valuation issues and disputes
  • Extensive international arbitration and litigation experience
  • Instructed on projects up to a value of US$10bn


Phil is a quantity surveyor with over 30 years of experience in the construction and engineering industries. He particularly deals with the preparation and valuation of variations; claims for prolongation disruption and acceleration, disputed accounts and counter-claims and damages.

Phil gained 12 years working experience with two of the UK’s largest multi- discipline construction and engineering contractors. In this time Phil carried out a full range of quantity surveying and commercial management functions on power station projects, water and sewage treatment works, petro-chemical and other process plants as well as major civil engineering projects across the UK.

For the past 16 years, Phil has been a consultant involved in claims, dispute, and expert work on major projects around the globe including UK, France, Netherlands, Germany, Poland, Denmark, Russia, Egypt, Saudi Arabia, Qatar, Oman, UAE, South Africa, Singapore, Peru, Canada, USA, Australia, and Japan

Phil has experience across many sectors of the construction industry including power generation, water and sewage treatment, petro-chemical and process plants, roads, tunnels, rail, and major domestic and commercial building. He has been instructed on behalf of employers, engineers, main contractors, sub-contractors, and JV partners in dispute.

Phil has been involved in many different dispute resolution procedures in various jurisdictions including litigation, arbitration, adjudication, expert determination, mediation and DABs.

This expert has the following cross-examination experience:

  • International Arbitration
  • Domestic Arbitration
  • Adjudication/Mediation

This expert has recently been instructed by:

  • De Berti Jachia Franchini Forlani
  • Mundays LLP
  • Pinsent Masons
  • DAC Beachcroft
  • KR Lalla & Company

“Phil brings his in-depth and very wide ranging experience and knowledge to every matter with a hands on and affable approach. Phil is someone I have come to trust over many years of engagement on complex matters. I have never been let down by Phil or his judgement.”