Kingdown School headteacher Sara Edwards believes plans for a new sixth form will help the school to continue to build on its success.
The school in Warminster submitted plans to Wiltshire Council in April for a sixth form to include a common room, where food will be served, seminar rooms and an ICT suite.
It would be built between the all-weather pitch and the school boundary. The school originally submitted an application for a sixth form on the same site in 2012, but the new application includes elevation changes.
Mrs Edwards said the school’s current sixth form building, which will be turned into classrooms, was inadequate for the pupil numbers for post-16 education.
She said: “We have been looking at getting a new sixth form for the last three years and now have enough money.
“Our numbers are continuing to increase and it is important that our facilities improve to help us continue to be successful. It will mainly be a social and independent learning area and give students a space of their own.
“We want work to start in the next month, with the building to be completed early in 2015.”
The school currently forecasts pupil numbers for the next five years will increase from 1,562 to 1,719 – 235 to 320 in the sixth form.
The deadline for comments on the plans is Monday, May 12, and the council expected to make a decision at the start of June.