Hi all - first time post and hoping to tap the knowledge of wealth out there I am building a new house on a 405 sqm lot with the BCC area and have been held up by issues relating to the neighbours recently completed new build, also on a 405 sqm. My block required a retaining wall along the common boundary side (but within my boundary) and on excavating soil for my retaining wall, the fence on the neighbours property but along the boundary would have fallen over due to not having the support posts to a suitable level under the soil. 700mm vs actual 300mm. We were held up for a couple of weeks for the neighbour to sort a solution. The next issue was an encroachment below the surface caused by an over-pour of concrete footings for the neighbours concrete block retaining wall - during the construction of my retaining wall, we had to dig down for the supports only to hit concrete. This resulted in my builder excavating the entire length of the wall & requiring the neighbours builder to remediate the situation (jackhammer etc). However given the change in conditions, revisions had to be made in the retaining wall on my block, formi-tube, rock etc & now I am up for a significant variation cost. Anyone know where to go on issues such as these?