Board of trustees chairman Gabe McGregor said the school was under pressure because its roll was almost at capacity and more pupils were expected to enrol during the year.
The school needs extra classrooms, but the Ministry of Education will not consider any "property solutions" until the school implements the new zone.
Mr McGregor said the proposed enrolment zone went through consultation with surrounding schools late last year but as a result of the process, some schools and the ministry asked for changes to the zone.
"We made some changes to the proposed map and then it went to the ministry and they came back to us with some changes they wanted made as well."
He said the changes had been made and the proposed map was now with the ministry, awaiting approval.
"We’re hoping to hear back within the next week.
"We had hoped to have the zone established for the start of this year, but with there being a few changes and the ministry having to sign off on it, it hasn’t quite come through yet.
"We don’t know when it will be implemented yet. We’ve asked the ministry to allow us immediate implementation, just because of the pressure on our roll.
"But ultimately, it’s up to the ministry and they might come back and tell us we want you to start it on this date."
Ministry of Education figures show the school’s roll dropped from more than 100 pupils a decade ago to just 73 in 2009.
But Mr McGregor said the roll had grown consistently since 2011 — from 80 pupils in four classes to 144 pupils in six classes this year.
He said the school was nearing its 150-pupil capacity, and any future growth would increase class sizes, which might affect the quality of education at the school.
