Hi, I am currently interested in a property but only want to buy it if I can build a granny flat or maybe can construct dual occupancy in the future. It is in a big land of around 1024m2, but there is a board sewerage crossing the back yard and the site is sloping towards the rear part. I am just wondering if it is feasible to build a granny flat in the back, if so, is it going to be very complicated? How the board sewerage will affect the price? Thank you.