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Hi, Cheeky Chops & Buildersmate, thank you for answering. We are at the end of Terraced houses, my new neighbour is knocking walls about and apparentley converting the small front bedroom into a bathroom. The sewer pipe at the moment runs along the rear of the houses, he says he does not intend to use a noisey "Saniflow", but to pass the pipe through the floor joists. I think it all sounds a bit "iffy" as there is not enough fall. Years ago when we had our rear small bedroom converted into a bathroom, the council insisted that we studded and insulated the party wall. Personally, I think he does not have any Building Regs permission.