We are in a typical London terrace - both houses have extended the kitchen, however, when they neighbours extension was done (by a previous owner) the didn’t build up the party line. Their extension is stepped ‘in’ roughly a metre from the party fence line.
The fence between us was removed when our builders did our kitchen extension, however, for various reasons we now have no evidence, or measurements, of where the first fence post should go. We need to resolve this in order to wrap up the party wall side of things and our builder will soon finish snagging, so needs agreeing now.
Neighbour suggested (option C, which isn’t drawn quite right) - the fence line should go from the very last post at the ends of our garden to the corner end of our extension.
Husband went back and suggested option A) - follow the existing fence posts, as these will not all have moved, and then run from the last original fence post closest to the house to the party wall line on the original buildings. While our extension starts from the party wall line it begins to deviate from the party fence line quite quickly, as we preferred a right angle on the extension. He also suggested option B - that we take the average line from the fence post at the end of our garden through to the party wall line on the original houses.
Party wall surveyors are refusing to suggest what line this should take and the fence is jointly owned but neighbour is refusing to engage. Husband has previously asked neighbour if they could meet outside to agree and mark up the line, which has been refused.
What are our options? And what is the general consensus on what is most fair here? Neighbourly relations are poor.