Our neighbour is subdividing his backyard which includes a tennis court. The tennis court fence was setback approximately 500mm from a retaining wall. At the ends of the tennis court there was timber fencing between the retaining wall and the tennis court fence so that we effectively had a 500mm wide rectangle on his property. I have attached a diagram of the rectangle. Our neighbor has replaced the retaining wall and now is asking us to pay for half of the costs of a new timber fence, stating that the tennis court fence was not a boundary fence. My argument is that the tennis court even though it was on his property and not on the boundary was a dividing fence and that we should not be paying for 50% of the costs for the new timber fence. Any advice would be welcome. It seems that we are in a bit of a grey area, after speaking to our local council and referencing the Fences Act.