The Berejiklian government says it will deliver "more" free TAFE courses than Labor and "faster", as it promised to fund an extra 100,000 free places over the next four years.

Premier Gladys Berejiklian also committed to building a new $80 million "mega-TAFE" near the forthcoming Western Sydney Airport if the Coalition is returned to government at next month's state election.

NSW Premier Gladys Berejiklian and managing director of TAFE NSW Caralee McLiesh, left, at Miller TAFE in south-west Sydney on Wednesday. Credit:AAP

The government's 100,000 extra free courses will comprise 70,000 places for young job seekers taking on traineeships and 30,000 places for mature-aged workers wanting to re-enter the workforce. The policy is expected to cost $85 million.

The Premier's announcement on Wednesday means the Coalition and Labor will head into the election with rival free-TAFE policies.