Schools operating over their campus capacity are getting creative to cater for roll growth.
New data shows 17% of state schools had more students enrolled than their official classroom capacity last year.
Another 71% are operating at capacity.
Secondary Principals' Association president Vaughan Couillault told Mike Hosking packed schools typically put in more prefabs in the first instance.
He says they may also start to make classes bigger or use libraries and meeting rooms as classrooms.
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The Mike Hosking Breakfast