The school serves children from all over Rhondda Cynon Taf and surrounding counties.

The upper school is the western side of the building consisting of several Science labs, Modern Foreign Languages and mathematics.

The building has expanded several times in recent years with the addition of new sporting facilities and new classrooms with elevators to cater for wheelchair users.

St Elvan's is usually the host for whole-school services and major school events, such as the annual Prize Giving ceremony.

Notably, the school has welcomed iconic members of the Anglican Church through its doors.