Neighbours are responsible for shared fences. When building or repairing fences both parties should agree on the style, cost and timing of the necessary works
A Fencing Act provides a formal process for resolving of fencing disputes including the issuing of a fencing notice. Costs should be shared between neighbours
Both neighbours should pay for a fence to be built or repaired. Usually, you would each have to pay for half of the cost of the fence, and agree on a style of fence.
The Fences Act contains a dispute resolution process for when you and your neighbour do not agree about the location of the common boundary
You may give a boundary survey notice, which sets out your intention to have the common boundary defined by a licensed surveyor
Neighbours should attempt to resolve any issues between themselves rather than having the fence dispute escalate into an expensive and ongoing issue