Atlanta International School is adding a $12-plus million expansion to its campus.

The new three-story primary school building will include 21 classrooms, an outdoor classroom, flex space and shared work areas. The project also includes a new cooling tower to improve air conditioning to both the new Primary School Learning Center and existing buildings and a new cafeteria and large outdoor courtyard and learning area.

SG Contracting, an Atlanta-based general contracting and construction management company, is overseeing the construction.

Atlanta International School is a private school that has students from kindergarten to high school representing more than 60 countries. About half of its students are international. It offers an International Baccalaureate and language immersion programming.

“The new Primary Learning Center will create spaces that have a new level of connection and flexibility, offering our students exciting opportunities for creative collaboration, exploration and learning,” Headmaster Kevin Glass said.

Sachin Shailendra, president of SG Contracting, said, “AIS is a critical component of Atlanta’s international fabric, and we’re happy to see it expand.”