Diales specialise in providing Expert Witness services to the global engineering and construction industry. Our experts support the legal profession in Arbitration, Litigation, and Alternative Dispute Resolution.

Working across all areas of the construction and engineering industry, our support covers Delay, Quantum, and Technical disciplines, including Architecture, M&E, Power and Environmental, and Civil and Structural Engineering.



About Diales

Diales provide specialist support to the global engineering and construction industries, in Arbitration, Litigation, and Alternative Dispute Resolution.

Diales Experts:

  • Understand their responsibilities to the court and to their clients.
  • Have participated in formal conflict resolution processes; they have given testimony, and they have been cross-examined.
  • Are experienced in producing concise, detailed reports, on time, and within tight deadlines.
  • Have access to global support staff through the Driver Group plc, enabling them to meet client requirements and maintain excellent standards.

Our expertise supports the delivery of major projects worldwide, and bridges the gaps between the construction, legal, and financial sectors. Our specialist experience covers the mining, energy, infrastructure, buildings, oil and gas, transport, marine, and process and industrial sectors.

With 31 offices across 18 countries, spread over 5 continents, our team of highly qualified consultants and experts understand the needs of our clients, their culture and the culture of their location, enabling us to understand their problem and set about the solution.

About The Driver Group

Driver Group has been providing consultancy services to the construction and engineering industries since 1978. The company has grown to over 500 members of staff, with offices across the UK, Africa, Americas, Asia Pacific, Mainland Europe, and the Middle East. The range of services offered across the Group provides support to the construction and engineering industries it serves, from start to finish.

The consultancy business trades as ‘Driver Trett’ following the successful acquisition of Trett Consulting in May 2012. The Driver Trett team deliver high level commercial and claims support, as well as procurement advice; contractual and strategic advice; and the full range of planning and programming services.

Driver Project Services is the group’s project controls team. They deliver commercial management, quantity surveying, and planning services throughout the project lifecycle.

Diales is the Group’s specialist expert witness service, that deals with higher profile litigation, arbitration, and alternative dispute resolution cases.