Looking at a property in Morton Bay area that has a sewer easement running right through the middle, diagonally front to back, but not running under the main dwelling. Wanting to place a granny flat in the back, and despite being large-ish (600+) block, the only usable area is smack bang in the middle of the sewer line. Have spoken to Unitywater, GF builder and Town planner- all of which say it is possible but ultimately up to the water authority to decide, which is no guarantee. If I went ahead and everything was approved, what happens if there is an issue with the sewer line down the track, and Unitywater need to access the pipe? I know in other states authorities have the ability to remove whatever has been built on top (legally or not) should an issue arise- this can be a condition of adding a structure over an easement. Anyone have any experience with anything similar?