The Labor government promised to build a new school prior to being elected in 2014, and announced a new Wollaston Road site for the school last February.

The site was purchased for $1.24 million from a $5 million commitment made in the 2015-2016 state budget.

School council vice-president Elaine Knowles, who has two children at the school, said she was “devastated” when she heard it had missed out.

Mrs Knowles said her son Hugh,11, had been taken to hospital after being accidentally knocked over in the school yard due to a lack of space.

“It’s just jam-packed,” she said.

Assistant principal Sue Fraser said she was “extremely disappointed’ with the news.

Ms Fraser said the school, with more than 130 students and three new enrolments in the past fortnight alone, had taken measures to deal with overcrowding including staggering lunch breaks.

“We’ve got everything ready to go,” Ms Fraser said. “All the plans, all the landscape architecture, everything is done. It’s just a matter of getting that go-ahead and getting that full funding.”

Close to $18 million is needed to build a new school, which could have been started within months if the funding had been received.

South West Coast MP Roma Britnell said it was disgusting the school had been left “high and dry”.

“The opening address was about putting people first,” she said. “If you read the treasurer’s words, how can he not have our most vulnerable, the children who are disabled in our community, as his first priority?”

A spokesman for Education Minister James Merlino blamed the previous Liberal government’s education cuts for a “backlog of school investment”.

“We know there are many more schools that need upgrades, including new buildings, in coming years.”