This is a question asked by many property owners in NSW. This is because disagreements over dividing fences can often cause friction between neighbours. Generally, the basic principle under The Dividing Fences Act 1991 (NSW) states that, as adjoining owners, you are required to equally share the cost of a “sufficient dividing fence”. Should your neighbour disagree about the kind of fencing that is to be built, then you can choose to seek a resolution through mediation.