Please help...... we want to build a single story extension but when we dug our footprint we revealed a 4" plastic sewer pipe running right through our footprint. We had CCTV completed which revealed that there is not enough fall on the pipe and southwest water have refused us building over consent. The pipe is shared and is a long standing problem, they want us to pay an extortionate amount of money to see if we can re direct the sewer! How do we increase the fall? Why can't we replace the pipe as there is inspection manhole covers a meter each side of our footprint? Has any one else experienced this problem? Please help