Õ¥Ö¼§ is now set to start in March.
The predominantly new build scheme will accommodate up to 2,050 pupils, consolidating what is currently two campuses onto a single site, comprising both new and refurbished buildings.
The development also includes sports pitches, outdoor games facilities, sports halls and an outdoor amphitheatre.
Õ¥Ö¼§ is due for completion in September 2013.
Thetford Academy was created in 2010 following the merger of Charles Burrell and Rosemary Musker high schools.
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