Bowral Public School principal David Cowie, recently returned from Canada, says it is high time for the Government to make good on a promise made in the 1950s and open a new school on a block of land it bought for that purpose in East Bowral.

The bushland block is located on Old South Road, bordered by Bowral Street and Sheffield Street.

"The plans were drawn up for a new school to be built on the block but then shelved 40 years ago," Mr Cowie said.

"We have a teacher-librarian who recently retired after 50 years of service, who originally bought her house in East Bowral right next to the site of the 'new school'."

Mr Cowie said land on which Bowral Public School was built was sufficient for 300 students at most, but there had been around 600 students learning and playing there for several years now.

"The Department (of Education) looks at areas of rapid growth to allocate new schools," Mr Cowie said.

"While we have not had rapid growth, we are facing a problem that has been here for many years.

"There is a desperate need to reduce Bowral Public School by half and put that half on the other site."

Mr Cowie said the school council would be lobbying the NSW Government on the need for a second primary school in Bowral, and that Wingecarribee Shire Council would also be approached and asked for its support in the campaign.

He said the push for a second primary school would run alongside a similar campaign for a new high school for the area to take the pressure off Bowral High.