As of 2015, Grimsley's campus has 11 separate buildings, consisting of the Main building (1929), which has offices and classrooms on the first floor, classrooms on the second and third floors, and the 1500+ seat John Barnes Chance-M. Thomas Cousins Auditorium. The Old Science Building (1929) has two stories of classrooms. Immediately behind it is the one-story New Science building (1975). There is a two-story Home Economics Building (1956). The one-story Library Building (1967/expanded 2003) has two classrooms as well as the GHS library. The Old Cafeteria Building (1929) has classrooms on the first and second floor currently. Before 2014, the cafeteria building housed the school lunch room. The two-story Herbert R. Hazelman Music Building (1956, named 2004) contains the band, orchestra, and choir rooms, plus numerous practice rooms and two classrooms. The Vocational Building (1942) has two stories of classrooms. Plans were complete in 2011 for a new Cafeteria Building (authorized by a bond vote in 2008), to be constructed behind and between the Home Economics and New Science buildings. The New Cafeteria building was complete by the beginning of the 2013–2014 school year.