The requirements for boundary fencing are covered under the Fencing Act 1978.
We do not administer this act and advise that if you are going to do any work related to boundary fencing you should first discuss this with your neighbour.
If you are unable to reach agreement then you will need to seek legal advice to find a solution.
Please be aware that if you propose to erect a boundary fence that is outside of the scope of exempt building works, you will need to apply for a building consent before starting work.
Follow the links below to learn more about exempt building works.
About Building Consents
Fencing Act 1978 (legislation.govt.nz)