John Delaney is a Chartered Quantity Surveyor and a Fellow of the Chartered Institute of Arbitrators, with 24 years of commercial experience on a range of projects in civil engineering, transport, mixed-use, high-rise, commercial, residential, industrial, health, and local authority sectors.

John has been regularly appointed as a Quantum Expert in respect of matters before the High Court in Ireland, the Court of Session in Scotland, County Courts in England, arbitrations, mediations, and statutory adjudications in the United Kingdom and Ireland. John is regularly appointed to provide opinions as to quantum in respect of professional negligence claims made against construction design team members. John holds qualifications in Construction Law, International Arbitration, Construction Adjudication, and Expert Evidence.

John has provided cost and commercial management, expert witness, and dispute resolution services to numerous clients across a broad range of sectors, specifically construction, civil engineering, and gas pipelines, and has worked on projects in Europe, the Middle East, Africa, Asia, and Australia.

In the course of his career, he has acted as a consultant on multi-million-pound disputes, arbitrations, and adjudications and provided claim preparation/management on numerous projects under both standard and bespoke contracts. He has a successful track record of preparing detailed reports and meeting client demands.

John has also prepared independent reports for the valuation of variations accounts, claims for loss and expense, claims for defective work repairs, supporting narratives for extension of time applications, assessment of submitted final account claims, and commercial strategies for negotiation and settlement of interim and final accounts.

John is a Recommended Expert in Lexology’s Construction, Arbitration, and Consulting Experts – Construction – Quantum, Delay & Technical research.  His peers say he is “a strong commercial operator who offers sound, pragmatic advice”, “his work product is extremely detail orientated and robust, but it is also presented in such a way that makes it easy to read and understand”, and that he is “one of the leading names in the quantum market when it comes to professional negligence claims in the construction and engineering sectors.” His peers also say that “he has a real gift for making the complex seem simple and for adapting his style to different audiences”, “he always has a strong grasp of the issues”, “his reports are accurate and produced in a timely manner”, and “he sits among the foremost construction experts in the market thanks to his stellar track record in high-value disputes involving professional negligence claims.”

Visit John’s Lexology Profile

John also authors the Irish chapter of The Construction Disputes Law Review 1st Edition (2022), 2nd Edition (2023), 3rd Edition (2024), and 4th Edition (2025).

John is a board member of the International Construction Law Association and a member of the Society of Construction Law Ireland Committee.

Pierce has more than 17 years of experience in infrastructure and natural resources projects in Europe, Asia, and North America. Following a number of roles working with main contractors, Pierce has worked for the past 10 years in contract and claims management with a focus on dispute avoidance.

Having undertaken a Master’s Degree in Construction Law and Arbitration, Pierce has a sound understanding of construction contracts and has had exposure to various Standard Forms (particularly FIDIC, NEC3, NEC4, and Public Works) as well as bespoke contracts. Pierce has worked with clients in a number of industry sectors and has experience with various delay analysis techniques and specialist planning software. Pierce has experience negotiating favourable terms within contracts for his clients with a particular interest in programme management, project controls, and delay clauses.