The rebuild of the fire-ravaged Corrimal High School could take up to three years to complete.
The Department of Education is currently working with stakeholders to develop a concept design for the rebuild of infrastructure lost in the fire last November.
This response comes hot on the heels of Keira MP Ryan Park writing a letter to new Education Minister Sarah Mitchell.
The Shadow Minister for Illawarra noted that the government's assets division had assisted the school greatly.
But Mr Park said he was concerned about the length of time it was taking and the lack of a clear timeline outlining when the building works will be completed.
"Surely after six months after the fire this can be sorted out and discussed with the school so they can provide feedback as to the most ideal location and scheduling of works to minimise the impact on students and staff," he wrote.
"There was comment made that the new building could take anywhere between two to five years. That is clearly unacceptable and will not be tolerated by myself or the community I represent."
In response to Mercury questions, a NSW Department of Education spokesman said the department was working with an insurance loss assessor to determine a budget and project scope.
"The department will continue to consult with the school principal about the potential scope of the project and will begin discussions with architects about the concept design," he said.
It is early in the planning stage for the new build......timeframe could take two to three years.NWS Department of Education spokesman
"The rebuild will be used as an opportunity to deliver modern school infrastructure with sustainable solutions and contemporary learning spaces.
"It is early in the planning stage for the new build and a typical planning, commissioning and construction timeframe could take two to three years."
Mr Park also expressed his concerns the temporary industrial arts demountable classroom hadn't been "properly fitted out".
The spokesman said demountables are progressively being modified, adding Corrimal was operational with demountables in place as a medium term solution to provide industrial arts teaching spaces.