Work has begun on a £4.3 million science hub with laboratories and lecture theatres to educate young scientists at Stowe School.
The existing science block - built in 1973 - will be demolished and it will be replaced with a two-storey building with a new sixth-form science base and exhibition foyer.
Architect firm Squires and Brown has designed the single-storey building, due to be completed in October 2016.
Construction firm Stepnell has begun the work on the building, which will be fully wheelchair accessible.
The new entrance will be fully glazed and protected with a sun-shading system.
This project follows Stepnell’s construction of Stowe’s music school, which opened in 2013.
Stepnell’s area manager, Steve Burgess, said: “We’re very excited to be working once again with Stowe School to deliver these state-of-the-art educational facilities.
“The science building project will create a first-class learning environment, designed and built to the highest standard, to meet the needs of the increasing number of pupils choosing to study science.”