N
Newboy
I'm assuming that your diagram & photo in post #6 are turned 180° from your photo in post#15?
1) Confirm that it only serves your home - camera survey would be a good check. I'd be interested (must get a life!) to know where the run goes to after it exits the chamber.
2) If it does and you are going to extend over the sewer then consider ripping the chamber out and building a new one with a double seal. Rerouting your current waste runs doesn't look feasible. The interceptor arrangement already looks to be blocked and there's either a vent or roding eye somewhere between the two houses.
Depending on where the outlet runs to, it's possible you might need to consult with Thames after all.
1) Confirm that it only serves your home - camera survey would be a good check. I'd be interested (must get a life!) to know where the run goes to after it exits the chamber.
2) If it does and you are going to extend over the sewer then consider ripping the chamber out and building a new one with a double seal. Rerouting your current waste runs doesn't look feasible. The interceptor arrangement already looks to be blocked and there's either a vent or roding eye somewhere between the two houses.
Depending on where the outlet runs to, it's possible you might need to consult with Thames after all.
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