The new two and three storey Spires Academy building in Canterbury will accommodate 600 students in six main learning areas.
This project involves disposing of the site of the Montgomery School and re-investing the proceeds to help fund the new facility on the adjacent sports field.
The design incorporates specialist facilities for a four-court sports hall, dance and drama studios and an enterprise suite.
Biomass boilers will heat the predominantly naturally-ventilated building when it is completed.