Garth Hulley was called to the Bar on 7 July 1997. Two years after admission, he took up a post at the Constitutional Litigation Unit. He took silk on 16 September 2014.

In January 2020 he took up an appointment as an evidence leader with the State Capture Commission where he was the leader of the Law Enforcement Agencies work stream.

His areas of practice include constitutional and administrative law, labour and employment law, commercial law, medical malpractice and personal injury law, aspects of municipal law and construction law. He has been involved in many tender reviews both for and against state entities and works frequently with various aspects of the Public Finance Management Act and the Local Government: Municipal Finance Management Act.

He has been involved in a wide array of cases in areas ranging from criminal and labour law, on the one hand, to judicial independence and the constitutionality of municipal rates, on the other. He has appeared in Swaziland and Botswana. He has acted as a Judge of the Labour Court and the High Court of Gauteng (Johannesburg and Pretoria) on numerous occasions and has written several reported judgments particularly in the Labour Court.