Education Minister Peter Collier said the first stage of the program would cost $39 million and provide new buildings for art, media, textiles, science, technology and enterprise.
There was $12 million set aside for a two-storey block for Year 7 students, who will attend secondary school for the first time in 2015.
Mr Collier and Riverton MLA Mike Nahan launched the start of construction work last Wednesday.
Get in front of tomorrow's news for FREE
Journalism for the curious Australian across politics, business, culture and opinion.
READ NOW‘The school was deservedly named WA Secondary School of the Year in the 2011 WA Education Awards, and the visionary leadership of principal Chris Booth has seen him named a finalist in this year’s Secondary Principal of the Year category,’ Mr Collier said.
‘Not only will Year 7 students have access to the outstanding facilities and technology available, but as we move into the next decade all students and staff will benefit from a modern environment befitting its status as one of WA’s premier schools.’
Dr Nahan said Willetton Senior High School was a clear illustration of the Government’s commitment to the highest standard of educational facilities for the Western Australian community.
The project includes a two-storey arts, media and textiles block, a two-storey science, technology and enterprise block, refurbishment to the performing arts building, a gymnasium extention, landscaping and car parking.
The original buildings were constructed in the 1970s.