Five years have now passed since the Construction Contracts Act 2013 came into force in Ireland on 25 July 2016. This article seeks to examine in the context of recent Irish case law, with the focus on the operation of the adjudication, what impact the Act has made in its primary policy objectives of, firstly, providing a prompt payment regime to improve recognized issues with cash flow and, secondly, introducing a process for the swift resolution of payment disputes. Drawing comparisons with the similar statutory regime in the UK, this paper reviews developments in adjudication under the Act in its first five years of existence in the context of recent consideration by the Irish courts, and identifies what challenges the regime may face in the future.