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Living Expenses

The cost of living differs between cities in New Zealand. However, approximate living costs are

Accommodation
Homestay fees are $230 (2017) per week.

If you are in a homestay, you may spend about $100 per week on lunches during the week, bus fares, entertainment etc.

Flats / Apartments
Average prices for flatmate positions range from $70 to $120 per week (+ expenses), and average rent for houses starts from about $200 per week (3 bedrooms, unfurnished).
If you are living alone, you may spend about:

NZ$
Electricity: $30 per week (summer); $45 per week (winter)
Telephone: $15 per week
Bus fares: $25 per week
Food: $100 per week
Total: $170 per week (summer); $185 per week (winter)

If you are sharing, you may spend about:

NZ$
Electricity: $15 per week (summer); $25 per week (winter)
Telephone: $8 per week
Bus fares: $25 per week
Food: $80 per week
Total: $128 per week (summer); $138 per week (winter)

A lot more information about this can be found at this link.