Not school, or not directly related to school(adjective)
A building or organization that is not a school.(noun)
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Use "nonschool" in a sentence
"The education department had a policy that prohibited religious instruction and worship at public schools during nonschool hours."
"We haven't paid for nonschool endeavors for Luke, our college junior, who has worked the past four summers at a robotics-engineering shop -- an internship equivalent -- to raise cash."
"At the University of California, Berkeley, for example, students who buy the school plan pay $10.80 for an X-ray on campus, while nonschool-plan holders pay $54."