Boundary pegging and redefinition by a licensed cadastral surveyor. Where the line actually is, marked on the ground
Fences are not boundaries. Hedges are not boundaries. Neither is the line the previous owner pointed at.
Only a licensed cadastral surveyor can re-establish a legal property boundary and put a peg in the ground that means something. I have been doing boundary surveys across Auckland since 1984, on everything from a single fence line to contested boundaries that have ended up in court.
Even cross lease boundaries can be problematic. The flats plan defines your exclusive-use area, but if buildings have been altered or added to over the years, the plan and reality can be well apart.
If that is where you have landed, it may be worth looking at a cross lease to freehold conversion while the survey is being done.
Most boundary disputes come down to someone assuming the fence was right. Once there is an actual survey on the table, a lot of them resolve themselves.
Where they do not, I have provided survey evidence and affidavits in contested matters and have been through the Environment Court process. You get a licensed cadastral surveyor’s determination, not an opinion.
Give me the address and tell me what is happening: fence, build, dispute, or you just want to know where the line is.