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any help would be gratefully accepted. We’ve had a single storey extension to the rear with toilet. Now we have a strange sewage like odour coming from behind the kitchen sink but not this side of the trap. The sink waste along with the new bathroom waste all now go into the soil pipe which in turn is now enclosed in the extension. The soil stack is now a plastic one instead of a cast iron one which has a cap or air admittance valve on top. This has also been shortened by about 5 feet and no longer goes through the waves and onto the roof. There is also a new manhole which I haven’t checked if it’s blocked but I wouldn’t think so as it’s only weeks old. (I’ll lift the lid and check at the weekend) once again thanks for any help. Steve.