St Anne's Church, busy as a place of worship, is also doubling as a school admin building while the adjacent St Anne's Catholic School is being renovated.
Staff needed a new space to work after the administration and staffroom area were demolished last week. Property operations manager at Diocese of Palmerston North, Corinne Richdale, said upgrading the infrastructure was necessary to match the school's increasing roll.
"The building was original from when the school was built and I think that would be in the 40s," Richdale said.
"It's had the odd upgrade, but no decent money spent on it."
Shane Stone Builders were doing the rebuild which will include a new principal's office, reception area, toilets and staffroom.