Lindum is to build a three-storey extension to John Leggott College in Scunthorpe.
The work will see 12 new classrooms constructed, along with additional breakout learning spaces.
It will also involve remodelling the existing frontage, giving the entire campus a new and modern appearance.
Work is due to start in May and is expected to continue until January 2023.
Lindum Construction was awarded the contract following a two-stage tender process.
Construction Manager Mark Robertson said: “As a Lincolnshire-based construction company, we will be looking to work with local suppliers and subcontractors on this project.
“Thanks to its history of manufacturing, Scunthorpe has an excellent network of practical businesses for us to call on.
“As part of the work we will also be refurbishing the adjoining building to bring the finishes it in line with new extension and the college is taking the opportunity to introduce a new breakfast area for the students incorporating a new coffee shop on the ground floor.
“The end result will make a huge difference to the appearance of the college and will reflect its position as a leading local provider of post-16 education.”
Lindum has vast experience working in ‘live’ school environments and Mark said the safety of staff and pupils would be of the highest priority.
“Fencing will be put up around the site and the current exit to the staff carpark will be widened by removing the brickwork walls and forming a wider access road,” he added.
“The current student walkway will be closed off and appropriate signage will be installed to direct students along the footpath around the site.
“Security cameras will be installed, and appropriate signage will be erected warning of recording cameras and the dangers of a construction site.”
Expansion work at the college has been commissioned to accommodate a predicted increase in students in the coming years. Scunthorpe has seen a significant increase in the number of Year 11 pupils.
Leon Riley, Principal at John Leggott College, previously said: “The expansion will allow the College to address the demographic upturn in Northern Lincolnshire and ensure we meet local demand.
“We continue to invest significantly into our estate to ensure our current and future learners have 21st century state-of-the-art learning spaces.”
Lindum Bids Manager Hayley Cowell is a former student from the college and said she was looking forward to seeing the work progress.
“I live in Scunthorpe and took my A Levels at John Leggott in 2005. I really enjoyed my time there and it will be great to revisit the campus during construction,” she said.
“As a local company, Lindum aims to do more than simply provide excellent buildings and I will be working alongside the construction team to ensure we engage with as many young people as possible over the coming months.
“We intend to bring added value to the scheme by working with John Leggott, and other local schools and colleges, to offer things like work placements, site tours and careers advice to pupils.”
Daniel Garfoot from Banks Long & Co said: “We are delighted to be involved with the John Leggott College project providing Quantity Surveying and Employers Agent services and we are looking forward to working with Lindum Construction to bring the scheme to a successful delivery for all concerned.”