Career
He was elected to the Northern Ireland Assembly for Lagan Valley in the 2007 assembly election. Mr. Lunn took over the Alliance candidacy for Lagan Valley from Seamus Close, the longtime representative for the area. While many pundits predicted that Alliance would struggle to hold on to the seat, Mr Lunn"s performance saw the new candidate being elected 4th out of 6 seat available.
He retained the seat at the 2011 Assembly election.
He is a former chairman of the Alliance Party. Trevor Lunn has been a councillor for Lisburn since 2001, serving as deputy mayor for the term 2005/6 and was elected as mayor of the City of Lisburn on 22 June 2006.