A group of Sydney's most expensive schools will spend up to $200 million on new facilities as they seek to attract lucrative student dollars.

New documents submitted to the NSW Department of Planning reveal that Wenona, Redlands and St Ignatius' College, Riverview are planning on spending millions within the next year on state of the art facilities.

The other developments, which range from a "retail and hospitality" hub at Riverview to an "Olympic pool with underwater cameras and timers" at Trinity Grammar, are designed to lure new students that pay tuition fees of up to $30,000.

Wenona girls' school in North Sydney has lodged a development application for an indoor pool inside a new six storey building focusing on science and technology.