Morgan Sindall's £25m redevelopment of Neston High School in Cheshire is set to be approved next week.
The scheme forms part of the Government's latest Priority School Building Programme.
The plan will see a three-storey building built next to the current Recreation Centre at the school site. The building design includes a central main hall and dining area, with classrooms located around the outside.
Enabling works are expected to begin in December 2015, with construction of the school and play area scheduled to start in January 2016. From September 2017 demolition of the old school buildings will begin, to make way for new parking and a bus stop.
The construction site includes part of the sports field, the former Sure Start Centre and the Leonardo Centre.
Once complete, the school will total 130,000 sq ft.
The scheme was recommended by planning officers ahead of a meeting of Cheshire West & Chester's strategic planning committee on Thursday 22 January.
Morgan Sindall was announced by the Education Funding Agency as the winner for the £120m contract to build 12 schools across the North West in August 2014. The projects are the third privately financed batch of Priority School Building Programme schools.
Morgan Sindall will be responsible for the design and construction of the schools as well as the provision of maintenance and lifecycle services over the next 25 years.
The contractor is supported on the programme delivery by architecture practices Stride Treglown and HLM Sheffield, alongside engineering firms Cundall, Waterman Group and 3E Consultants.