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We have the same arrangement of neighbours drains converging at our inspection chamber then running under our house to the main sewer. New IC in garden with all drains running to it.
Check Thames Water’s guidance on build-over agreements (actually quite good and useful) but IIRC they now don’t allow any internal manholes, even double sealed.
dbr
Prole.
@tbc
Below is what our plans say.
There is a reason why it couldn't be redirected, I think because our neighbour's sewer joins ours on our property (as with all the other properties on our street).
So it sounds like it will be sealed but will still need to be accessible. Which presumably will make flooring difficult?
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