Not sure this is the right place to post this but as it's building related i'll do it here.Our next door neighbours have recently removed there old lean to utility (built against our brick built utility ) and bulit a kitchen/utility room at the back of the garage at the same time converting the garage into a study and created a walkway between our utility and there extension,they have installed a toilet in the new extension on the outside wall,i assume they have installed a macerator as there is no soil pipe, does this still need to go into the main sewer pipe as there appears to be 2 pipes coming out of the wall about 2" diameter,the main soil pipe is against the side of the house so would mean laying a pipe about 4 metres long. Now the main point of this post, since this has been built we have the original storm drain in our utility and just lately we have been having a strong smell of sewage in the drain which appears to be leaking through the concrete, my suspicion is that the builders have dug a soakaway for the drain hence the suspected sewage coming through the concrete,how can i trace this without upsetting my neighbours. As this is quite a large extension it goes beyond the building line of the house would planning permission have been needed,also the overflow (i think thats what you would call it)from the central heating boiler comes though the garage wall into the walkway between the house at a height from the ground of about 4 feet the pipe comes out of the wall and has a u bend on it to direct any water back at the wall i always believd it should terminate at about 2" from the ground. Sorry for the long post