In 1996, Saunders was appointed a judge of the Eastern Caribbean Supreme Court (ECSC). He became a High Court Judge in 1997 and from 1997 to 2001 served as a judge in Montserrat and Anguilla. In 2001, he began serving as a judge in Saint Lucia.
In 2003, Saunders became a Justice of Appeal of the ECSC and in 2004 he became the acting Chief Justice of the ECSC, succeeding Dennis Byron. As Chief Justice, he was the supreme judicial officer of the courts of Anguilla, Antigua and Barbuda, the British Virgin Islands, Dominica, Grenada, Montserrat, Saint Kitts and Nevis, Saint Lucia, and Saint Vincent and the Grenadines. In 2005, he was appointed as a judge of the Caribbean Court of Justice and stepped down from the ECSC.
- "The Honourable Mr. Justice Adrian Saunders", caribbeancourtofjustice.org.