Hey guys, I decided to get downstairs toilet made under the stairs in my 100yr old victorian house. I already ordered the wall hanging WC pan and a sink. I need to know where the cheapest place will be for getting the water pipes and sewage pipes. Ill be having hot/cold water coming from upstairs bathroom. there's also a gas pipe that runs across the wall about 1ft above floor. the builder will redirect it under the floor.