纽西兰：增加租金

How much notice do I need to give to increase the rent?

For periodic tenancies the landlord must give the tenant at least 60 days’ written notice to increase the rent, in addition to a period allowed to correctly serve the notice. There is no limit to how much a landlord may increase the rent, as long as the rent is not increased excessively above market rate.
For periodic tenancies, the rent cannot be increased within 180 days of the beginning of the tenancy, nor within 180 days of the last rent increase.
Rent can only be increased for fixed-term tenancies where provision for this is written into the tenancy agreement.
For boarding house tenancies, the landlord must give the tenant at least 28 days written notice to increase the rent.

http://www.dbh.govt.nz/faqs-tenancy-rent