Works are set to begin soon on upgrades to Harrington Park Public School, with Grindley Construction being awarded the main works construction tender.
The development application for the school's upgrade - which will deliver 19 new classrooms and upgrade core facilities including the hall, library, covered outdoor learning area and staff facilities - has also been approved.
The works are expected to begin before the end of the year and be complete in late 2022.
The start of construction comes after Labor representatives called for action on the planned school upgrades back in October.
Local teacher and Labor party spokeswoman Sally Quinnell, the opposition spokeswoman for education Prue Car and Labor Duty MLC for Camden Mark Buttigieg visited Harrington Park Public School to call for movement on the upgrades, which were originally scheduled for completion in mid-2021.
"We are calling on the state government to deliver these much-needed upgrades as promised," Ms Car said at the time.
"The school is at 137 per cent capacity at the moment.
"Development is being completed before infrastructure and we are seeing that all across the south and north west."
Camden MP Peter Sidgreaves said at the time that the delays to the start of construction were due to traffic concerns.
"More time was needed for Camden Council and NSW Government Traffic Engineers to work together to address potential traffic impacts on Sir Warwick Fairfax Drive and Harrington Parkway," he said.
"As parents and members of the school community are aware, as well as residents of Harrington Park, there are existing traffic concerns around the school so it is important that traffic impact matters are resolved before the upgrade commences."
Mr Sidgreaves said this week the awarding of the contract was a positive step forward, and he was delighted with the progress of the upgrade works.
"This is an important project for the Camden area," he said.
"I'm pleased the contract has been awarded because it marks a significant milestone for the upgrade."
NSW Education Minister Sarah Mitchell said she was proud to help deliver the upgrades for the Harrington Park community.
"I'm very pleased the NSW Government is delivering these much-needed resources for the education of our children and look forward to seeing the new school starting to take shape in the coming months," she said.