Justin Sullivan

Founder and Managing Director
DD: +44 (0)1372 888630 | M: +44 (0)7932 940 000


Justin is a Chartered Quantity Surveyor, a Fellow of the Royal Institution of Chartered Surveyors (RICS) and has more than 25 years of experience in the construction industry. He formed Adair Ltd in 1994.


  • RICS Expert Witness Registration Scheme
  • UK Register of Expert Witnesses
  • Expert Witness Directory


  • A Professional Member of the Expert Witness Institute
  • An Associate of the Chartered Institute of Arbitrators
  • A Member of the Society of Construction Law

Construction Skills

His RICS duties include being the current Global and UK Chair of the Quantity Surveying and Construction Professional Group boards, a past member of the International Governing Council and co-authoring the RICS New Rules of Measurement 2 (the standard for the detailed measurement of construction work).

He is a Trustee of the International Construction Measurement Standards Coalition and immediate past General Secretary for the European Committee of Construction Economists (CEEC).

Justin also specialises in project management, quantity surveying and project monitoring for commercial projects and international super-prime residential projects in places such as London, Gibraltar, the Cayman Islands and UAE.

He has chaired and spoken at many conferences for the RICS and the CEEC, and is skilled at organising and facilitating networking clubs and events.

Expert Skills

Justin acts as an expert witness for construction claims, adjudications, arbitrations and civil proceedings, including those in the Technology and Construction Court within the High Court. He
provides expert reports for construction disputes, in particular those relating to quantum, building defects, contracts, professional negligence, construction costs and fees. Justin gave quantum evidence last year in the UK TCC Court.

Justin has acted as expert and single joint expert on many occasions. He is regularly appointed as a party representative in adjudication proceedings by referring or responding parties, and is often instructed by solicitors to support adjudication proceedings for claimants or defendants.