A $25 million library designed to look like a Scottish castle, an orchestra pit and a chapel nestled into nearby bushland are just some of the new features planned for Sydney's elite private schools, despite complaints from neighbouring residents and local councils.

Seven schools are planning to spend a combined total of more than $365 million on new facilities and school redevelopments, an analysis of development applications currently waiting for approval from the NSW Department of Planning and Environment has revealed.

Scots College in Sydney's east has submitted plans for a $25.1 million major upgrade of its library building, including a "complete recladding of the exterior in a Scottish Baronial architectural style" complete with castellations, a tower, a turret, and "grand bay windows".

A rendering for Scots College's proposed $25 million new library by JCA Architects.

Loreto Kirribilli has submitted plans for a $103.3 million staged redeveloment of the school, including a new five-storey "innovation centre", outdoor rooftop learning terraces and two "vertical connection pods".