This topic is very relevant to me. I have just moved into a new house (mid terrace), which means my house and the end house are sharing the downpipe from the roof - it was on their property - just inside the wall They have built a huge extension right across the back of the house. They had it built before I moved in and I have no problem with it. However, the guttering (or downpipe) which was there has just been cut off in mid air above the sloping roof over their extension. With the amount of rain we have been getting, there appears to be a huge gush of water flowing down, hitting their roof and just belting off the top of the wall between us. When the rain was really heavy, it was hitting off the wall and landing inside my wall causing a pool to form on my newly built patio. Its fierce noisy also. Am I within my rights to request they get it repaired/replaced.