Uniquely, Wales has a primary legislature, but remains part of a single legal jurisdiction with England. It does not have responsibility for administering civil and criminal justice but has long had a range of devolved tribunals. Given this jurisdictional and constitutional context, a distinctively Welsh approach to administrative law and administrative justice, tribunal reform, and “integrity” institutions has developed. Welsh tribunals have become a test bed for further devolution of justice powers and the eventual establishment of a separate Welsh courts and tribunals service. In this article we examine reforms to Welsh tribunals, alongside the potential for building a broader justice system from the foundations of administrative justice