"We're committed to building new schools and classrooms to meet demand, and ensuring that students can learn in facilities that enable them to achieve to the best of their potential," she said.
Whanganui MP Chester Borrows said the investment acknowledged the importance of kura to the community.
"It will give more whanau the opportunity to choose Maori medium education for their rangatahi.
"This also backs up National's commitment to supporting our Maori students to achieve, and to be able to do so in a kaupapa Maori environment," he said.
The new classrooms will have high standards of lighting, and ventilation and will feature the latest IT infrastructure to support digital learning. Mr Kawau said he had viewed some of the new classrooms in New Plymouth.
"They are a modular design, which means they can be moved around if school roles fluctuate," he said.
The last time new buildings were added to the school was in 2011, when new classrooms designed by Whanganui architect Eddie Belchambers were added to replace prefabs.