Private and Catholic schools will receive $500 million over four years from a Coalition government to build new classrooms to cope with ballooning enrolments.

Premier Gladys Berejiklian and Education Minister Rob Stokes will on Thursday announce the funding for independent schools to build, extend or upgrade their schools.

Premier Gladys Berejiklian. Credit:AAP

The announcement comes after the Catholic sector launched a concerted political campaign for more funding in the lead-up to the NSW election.

Last month, Catholic school bosses wrote to their 600 principals about their push for more money to spend on building and maintaining schools.