Hi all, my next project will be refurbishing the bathroom as it is in a sad state. The previous owner of the house was in his 90s and presumably could not get into or out of the bath, so it was removed and a shower fitted instead (without making good the gap where the bath was). Water has got behind the shower tiles and damaged the plasterboard and generally the whole thing is in disrepair. Anyway, I have a few questions. My initial plan was to do what the neighbours have done and remove the vent pipe and replace it with an air inlet valve. This has allowed them to put in a small built-in cabinet across the window wall and containing the basin and toilet which seems like a good use of the limited space. Also it means the hand basin can be moved slightly towards the end wall so it isn’t jammed up against the bath. I was also thinking that removing the vent would ultimately make reroofing simpler and allow more space for solar panels (longer term plan). However, speaking to someone else it seems that this breaks building regulations as you are meant to have at least one open vent in the system, and that the air inlet valve must be above the level of the basin outlet (theirs is just above floor level). Just wondering what other people’s experience/knowledge of this is. Also does anyone know what the vent pipe is made of? When I saw the neighbours’ removed it looked like asbestos but I didn’t look closely. They said it as cast iron, but I don’t think they removed it themselves, so maybe that as just what they were told. My last idea, if it isn’t advisable to remove the vent pipe would be to remove the boxed-in covering and replace it with an exposed chrome plated or stainless steel one to save space and make a feature of it, coming up through a built in cabinet.