Oh yes! such is kind of major operation..lol The old sewerage pipes (cast iron type) are already 30 yo, are rusty, leaked and smell too *vomit*. I raised matter, the HDB officer-in-charge came and saw, he also *shake head* lol. Pipes are possible to replace without punching through the structures floor. Procedures : Old Pipes are "sawed off*, removed and new pipes shift in, align and joint up the opening, then cement up. These process got to be extremely fast inorder not to catch any droppings from the top.. get it?
cost $800