The firm is now pressing ahead with the Stone Lodge School project following a pre-construction period.
The team has already conducted ecological investigations, relocated wildlife and diverted public rights of way.
BAM is using its integrated capabilities with BAM Design and BAM Services Engineering working on the three-storey building, delivering the mechanical and electrical elements.
Architect KSS has been novated to BAM.
Construction manager Dan Brenchley said: “BAM originally learned it had become successful in its competitive tender on the day lockdown was announced.
“So immediately we required an adjustment to this new way of working for our teams as we began to develop the design.”
He added: “By bringing more of the work in-house we increase co-ordination and reduce risks which helps us deliver the programme for the school and it enhances our ability to use digital techniques and find modular solutions.”
The school is currently operating from temporary premises. It will become home to around 1200 students and an additional 250 or so sixth form students. A separate sports block and external pitches are part of the new facilities.
Handover is expected to be in February 2022.