A Wellington high school has been forced to close after a shock finding revealed 13 classrooms are earthquake prone.

Wellington Girls' College claims the Ministry of Education never informed them the Brook block only met 15 percent of earthquake standards.

It's now having to roster students to work from home, while an alternative campus is organised.

Principal Julia Davidson says the school can legally continue using the building, but it isn't comfortable taking the risk.

"Sure, the seismic risk might be low but if that was to happen - the consequences of that would be severe."

LISTEN ABOVE