Work on Yealmpstone Farm Primary School is set to begin.
When the £2.8 million works are complete, the Plympton-based school will be able to offer 420 places for local children; exactly double the 210 it can provide today.
Contractors Ryearch Ltd will arrive at the school on Wednesday and will set up and prepare the site prior to the new school term in September.
Councillor Terri Beer, Cabinet Member for Children and Young People said: “It is great to see work begin at Yealmpstone Farm.
“This extension will make a real difference and I’m proud that we as a council have chosen to invest and support the school for the benefit of future, and of course present pupils.”
The expansion of Yealmpstone Farm will provide a new two-storey, eight classroom extension to the left of the existing school. The new building will fill the space next to the hall and create a new studio to act as an overflow to the hall.
New toilets, group rooms and storage will also be created while at the same time, the current hard play and playing field will remain intact. The new space will remove the need to bring temporary accommodation onto site.
Work at the school is expected to be completed by November 2018.