Alarms sounded at the school, 1517 Jessee St., shortly after 4 a.m. on Saturday.
Police responded to find a broken window on the side of the school.
Kingsport Police Department Detective Toby Wells said six inside windows, which allow viewing into classrooms from the hallways of the school, had also been broken.
The contents of a fire extinguisher were found dispensed down the halls.
Wells said a juvenile was quickly located near the school and confessed to the breaking and entering and vandalism.
Wells added that several miscellaneous items believed to be stolen from the school were recovered that night from the suspect, with others discovered later at the juvenile’s home.
Due to the suspect’s age, police declined to provide further details of the case, including if the suspect is a student at the school.
On Tuesday, the juvenile was charged with burglary and vandalism over $500.
Principal Jim Nash said the stolen items were personal contents of a teacher’s desk.