The school, which doubles as the biggest polling station in the electorate, will also receive airconditioning as a result of the funding.

Parliamentary Secretary for Western NSW MLC Rick Colless said the money would come from the coalition's $6 billion commitment to schools across the state, but added exactly how much money would be allocated hadn't been finalised.

"At the moment it's going through a final planning phase and the funding hasn't been approved per se, but it has been identified as one of those 170-odd schools across NSW which will receive that funding," he said.

Mr Colless later clarified it was party policy.

"It's a major thing the coalition government is committing to after the election," Mr Colless said.

"[Voters] can expect it if the coalition is returned, I don't know what the Labor party's plans are for these regional schools."

He said the final figure would run into the millions of dollars, but commercial confidence meant he couldn't specify a specific amount.

"I think when the final plans are produced it will go out to tender and it will go out to what the final cost will be. Irrespective of what that cost will be, the facilities and the demountables will be upgraded," he said.

Bletchington Parents and Carers president Warwick Baines thanked Mr Colless and the Nationals for the pledge and said it was something for parents to consider when voting on March 23.

"We as the P&C have been campaigning for some time to have our hall extended, it's a serviceable hall but doesn't fit the whole school so to have these facilities upgraded is fantastic," Dr Baines said.

"The kids will have a far better learning environment in which to engage."