New soil pipe questions

[Jim_cam]

Hi -- a quick couple of questions here regarding soil pipes. I'm digging the foundation for an extension as part of renovation work on an old house, and it's turned out that the soil pipe for the neighbour's house runs right down the middle of the trench for most of its length. I'm going to have to take it out; I'll put the new one in front of the trench, adding two shallow bends to get round the corner (I've okayed all this with the neighbour of course). I've not yet dug the trench to put it in.

The house as it currently exists has no plumbing. I'm not sure what the best course of action is for adding soil/waste pipes, or if there is a single best solution: Should I put junctions in the new soil pipe for the new kitchen, bathroom, and utility room that will be in the extension? Should I route them all into one section of pipe and join that to the new soil pipe? Should I route them into the existing inspection chamber (shown at the right in the drawings), which is a large concrete one with numerous unused entrances? Any advice you have would be great. The previous pipe setup was pretty ad hoc an chaotic so it's nice to have an opportunity to get everything in new, orderly, and accessible -- just not sure of the best way to go about it.

Here's a drawing of how it is currently, with the extension at the top:

And here's how it's going to be:

 

[muggles]

You need to contact your local water authority to get permission to do this, you can't just crack on and do it. They will tell you what they expect to see

 

[Jim_cam]

Thanks for replying -- the layout for the new run was suggested by building control, who also indicated that because the soil pipes were exclusively on mine and my neighbour's land it wouldn't require getting in touch with Anglian water. Is that incorrect? (certainly not ruling out the possibility it is)

 

[Hugh Jaleak]

Pipework from a neighbouring property, once it passes under the boundary, usually becomes the Water Co's responsibility. Speak to Anglian Water before doing anything, as it could well be their responsibility, and will definitely become theirs once you connect into it.

Best option for making your new connections would be via a chamber fitted into the new run. Allows access to the laterals you're planning to lay to the house.