The new school will allow Holy Family to move from their current shared site with Winchburgh Primary.
This will allow both schools to grow along with the expanding Winchburgh community when it opens in 2023.
The school is part of West Lothian's largest ever investment in education, a £60.7 million multi-schools project which will deliver the new Holy Family primary and two secondary schools as well as a shared sport, leisure and community facility.
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Executive councillor for education David Dodds said: "It's fantastic to see work starting on another superb new school in West Lothian.
"The council has invested heavily to make sure we continue to have one of the best school estates in the country, to give our pupils the best possible platform for education.
"The new Holy Family Primary will increase capacity for both denominational and non-denominational primary education in Winchburgh, which is essential due to the ongoing development in the area."
