Work on the £22.5m contract will begin later this month.
The new Chetham’s will be built in the city’s Medieval Quarter, between Victoria Station, the MEN Arena and the existing school building.
The architect for the scheme is Stephenson Bell and project manager is Drivers Jonas
Once the new site is complete, Chetham’s will plough on with further phases of its development programme.
This includes the refurbishment of the existing Millgate and Nicholls buildings, which currently house classrooms but will be transformed into accommodation for students.