In 1983, Hay was elected as a member of the Mount Roskill Borough Council, and served as mayor of that borough between 1987 and 1989, when it was absorbed into Auckland City. He was subsequently elected to the
Auckland City Council on the
Citizens & Ratepayers ticket, and served as deputy mayor between 1991 and 1998 under
Les Mills, and from 2001 to 2004 and 2007 to 2010 under
John Banks. His achievements on council included the restoration of the
Civic Theatre and the establishment of Metrowater, and he supported the formation of the
Auckland supercity. Hay was elected to the
Auckland Regional Council in 2004, and served one three-year term. He did not seek election to the new Auckland Council in 2010. ==Business career==