NSW's infrastructure spending will grow to a record $93 billion but Treasurer Dominic Perrottet has left the door open for more privatisations to fund major projects in the future.

Ahead of Tuesday's budget, Mr Perrottet said spending on infrastructure would "break through $90 billion for the first time" over the next four years, providing a vital boost to the state's growth.

Dominic Perrottet in question time. He will deliver his third state budget on Tuesday. Credit:Nick Moir

Delivering his third budget as Treasurer, Mr Perrottet said a key focus would be to deliver on the promises made by the Coalition in the state election campaign.

The Berejiklian government promised several big ticket items ahead of the March poll, including $2.8 billion for an extra 5000 nurses.