NAB offers pre-approval to its borrowers, which it calls conditional approval. You can apply for conditional approval with NAB via phone, online or in person at a branch.
Home loan pre-approval is an optional step in the application process that some lenders offer. Pre-approval means a lender has examined your savings, income and spending habits and has a rough idea of how much it could lend you. It's not the same as full loan approval and it's no guarantee that the lender will ultimately approve a full application. But it does allow borrowers to start looking for a home with more confidence and a clearer idea of their borrowing power.