A dividing fence is a fence that separates the land of adjoining owners, whether on the common boundary of adjoining lands or on a line other than the common boundary.
Prior to constructing a dividing fence between your property and your neighbours, you will need to contact them to work out the location, cost and design of the fence. This matter is covered by the Dividing Fences Act 1991.
If you do not know the name of your neighbour you may submit an Adjoining Owner's Details form to council.