Sam O’Callaghan (Capital Law)

Sam O’Callaghan

Sam O’Callaghan is a Solicitor in the Construction, Energy & Projects team, with particular expertise in complex contentious construction matters.

Sam was called to the Bar in 2014 before joining a construction law consultancy specialising in out of court dispute resolution (both nationally and internationally). He joined Capital Law in May 2017.

Sam has expertise in all forms of dispute resolution relevant to large construction / commercial disputes – and in particular – construction adjudication.

He has assisted clients throughout the supply chain, covering both public and private sector clients. Recent experience includes successfully representing a local authority client in defending a £5million adjudication.

While he focuses on dealing with contentious matters, Sam applies the experience gained from the contentious work to provide insightful analysis with non-contentious matters and assist in avoiding common problems that cause disputes.

Sam’s had articles and comments published in publications such as The Guardian and has appeared on BBC Radio Wales to address the ramifications of Carillion.

“Sam O’Callaghan is also praised for his ‘good working knowledge of the construction industry‘ and is particularly accomplished at handling adjudication work”

The Legal 500 | 2019

  • Assisting a large repair and maintenance contractor with a £3million aged debt claim which was met by over £4million counterclaim. Involved 7 discrete Adjudications before being resolved by negotiation and a substantial payment for the aged debt.
  • Commenced and defended several complex Adjudications on behalf of a contractor against a local authority – with the local authority claiming £14million for alleged defects.
  • Defended local authority client in relation to a £5million dispute for additional payment. Commenced a proactive adjudication for a contractual determination which successfully defeated the £5million claim in its entirety.
  • Drafting the contractual documents for a recommissioned wind turbine utilising a FIDIC Yellow Book 1999 form of contract.
  • Advised FE college on procurement and contractual documentation for the £30million Science, Technology, Engineering, Arts and Mathematics (STEAM) Academy.
  • Assisted local authority through the procurement of a new Dry-Mixed Recyclate facility; which involved drafting the ITT, PQQ and drafting the construction documentation based on the NEC4 Engineering and Construction Contract.
  • Adjudication
  • Arbitration
  • Commercial positioning and negotiation
  • Litigation
  • Mediation


  • Paralegal, Capital Law Limited (May 2017 – present)
  • Dispute Resolution Consultant, Contract & Construction Consultants Limited (2014 – 2017)
  • Director, Attica Law Limited (2014 – 2016)


  • BPP University: Legal Practice Course (2018)
  • Cardiff University: Bar Professional Training Course (2014)
  • Cardiff University: Law LLB (2010 – 2013)


  • Member of the Honourable Society of Gray’s Inn
  • Associate of the Chartered Institute of Arbitrators