St Mary's Primary School was closed for three months after the February 22 earthquake in 2011. Its roll dropped from 124 students to 65.
The school had damage to buildings and five new classrooms were built.
School principal David O'Neill said the roll had climbed back to pre-quake numbers with 115 students attending.
The new classrooms were great for the children and helped entice families back to the central city.
He said the growth was positive for the school and central city, as it showed people were moving back into the area.