A small shed has been destroyed at Hawker College, on Murranji Street.
ACT Fire & Rescue was alerted to the incident by an Emergency Triple Zero (000) call at 4:40am.
The 5mx5m shed was fully alight when units arrived on scene.
Firefighters extinguished the fire, which was confined to the shed with no further damage to the school.
Crews have begun salvage operations and are conducting investigations into the cause of the fire.
Three pumpers, two commanders and the Breathing Apparatus Van attended.