The scheme limits the number of pupils a school can take by allowing only those within a certain area to enrol.
Those outside the designated zone are subject to availability of places.
Principal Tara O'Neill said the school was getting too many pupils for its current size and the scheme enabled the school to keep an eye on the numbers.
‘‘There’s not enough space at the school and there are too many students.’’
There were a lot of home developments around Waitati and more pupils kept turning up, she said.
The school had potential to expand and an enrolment scheme was a standard part of that process, she said.
When home zones were in place the Ministry of Education would start to consider expansions, as the scheme proved the school had a need for more infrastructure, she said.
It had been in the works since last year and had taken a long time to be put into place.
There were just over 100 pupils enrolled at the school at present.
There would still be some space for pupils outside of the home zone, she said.
A formal notice would go out advertising the number of spaces soon.
