Wicklow County Council has granted planning permission for a new school building at Greystones Community College.
It's expected the project could now reach completion within 18 months of the first sod being turned.
Wicklow Minister Simon Harris says the extension will help meet the rising demand for school places in the area.
Wicklow Surgeon Honoured By Tallaght University Hospital
Extra Lifeguards Deployed With Extended Hours On Wicklow Beaches This Week
Bus Service Boost For Wicklow with Connections to Carlow & Kilkenny
Greystones Man Given Suspended Sentence Following Sustained Campaign Of Abuse
Appeal for Information As Rathdrum Man Reported Missing