The building, which will house the school office, staff room, teachers’ work room, board room, interview room, sick bay and offices, is stage three of the rebuild project.
It will also contain the Maniototo Community Library, with a separate entrance for the public.
Stage one — the school’s technology block and design hub — opened last year, followed by the stage two, the senior classroom block.
Stage four — the junior classroom block — is expected to be completed in March next year.
Principal Joe Ferdinands said he was "really delighted" to be able to move in to the administration block earlier than anticipated, with staff able to be based in the building at the start of term four.
The original completion date was set for December.
"Right now we are looking at furniture and stuff," he said.
The previous school buildings were tired and difficult to maintain and the new buildings were more conducive to teaching and learning as pupils and teachers were more comfortable, he said.
"Even a new coat of paint couldn’t take the tiredness of these old buildings.
"It will restore the mana of the school — we are proud of this new building, I mean, we love to show them off."
Mr Ferdinands said he hoped the new buildings would eventually translate to more pupils staying in the region to complete their schooling rather than leaving to study elsewhere in their senior years.
"We do understand there’s tradition ... but having said all that the amount of opportunities the kids get here in senior school is huge."
