The NSW Government will outsource the maintenance of more than 200 Sydney schools as it seeks to sell off part of the state's public works program.

The call for expressions of interest from the NSW Minister for Finance Services and Property, Dominic Perrottet, is the latest in a string of non-teaching privatisations in the public education sector.

NSW Finance Minister Dominic Perrottet Credit:James Alcock

Cleaning, design and maintenance services are currently outsourced in different areas across the state.