Melville High School students will return from their holiday to a refurbished science block and recreation centre.
The upgrade comes at the cost of other buildings that were used by performing arts and special needs students.
To secure Ministry of Education funding for work on the science block and recreation centre, "surplus" buildings had to be removed. Only those surplus buildings were being used.
Principal Clive Hamill said a large building that was utilised for performing arts was demolished. Another building for special needs students, which included a specially-fitted toilet and kitchen, was also removed. The school only has regular classroom space available to meet the specialist needs.
Mr Hamill said every school was "funded and resourced based on the number of students". As such, Melville was seen as being over-resourced in terms of buildings so some had to be sacrificed in order to gain approval for the recreation centre and science block upgrades.