The Science Building (later known as the Maths building incorporated Science and Computers) was the third Hills Grammar building and was constructed in 1984.
The official opening of the two buildings, (referred to as the “Preparatory School Building” and the “Secondary School Science Block”) was on 17 July 1984, by NSW Governor General, His Excellency Air Marshal Sir James Rowland. During Christmas break 2005 a major move took place…. Junior School moved 6 classes - 3 classes for Year 5 and 3 classes for Year 6 to the Old Science Building (1984) creating a merge with Senior School. It is now the Year 6 Centre.