I'm considering this property and it's got a sewer mains running through the back part of the land (but not on the back edge) and the land between the back fence and the sewer pipe is shaded in the sewer diagram sketch. My solicitor pointed this out to me - he said the "plumber hashed the hand behind the pipe - this usually means you'll encounter difficulty building on it". I went and did further research and ascertained the following: 1) the land is not in a flood zone, not subject to mainstream flooding or overland flows 2) no easements 3) title search looks clear My solicitor can't get more specific than the above - what could he be referring to that would block, say, a granny flat build? Land is narrow block (12m frontage) and slopes towards the back gently. I'm aware of potential sewer concrete encasement requirement adding to construction cost and I'm fine with it.