Short answer: You need at least 10% of the house price. On a $600,000 house, that is $60,000.
For most first-home buyers in New Zealand, you need at least 10% of the house price saved as a deposit. If the house costs $600,000, you need $60,000. Some schemes let you buy with 5% if you meet certain conditions.
Setup: Sarah wants to buy a $650,000 house in Hamilton.
Deposit: She needs $65,000 (10%).
Extras: She budgets $8,000 for lawyer, inspection, and moving.
Kiwisaver: She has $35,000 in KiwiSaver she can withdraw.
Savings: She has saved $30,000 in cash.
Total: Her total available is $65,000. She has enough.
Shortfall: If she only had $50,000 total, she would need to save $15,000 more or look at cheaper houses.