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Glad you found the problems and got it sorted. Are you going to look to reclaim costs from the builder or put it down to experience?
Bobbo-
I'm not sure any of it actually was the builder to be honest.
The biggest issue was the damaged elbow underground - he didn't touch that. The T may have been installed by him or a different guy who came to check our drains last year when we thought we had a smell and rat problem. He came to check on it a couple of days after I posted on here and was really nice about it - he's a decent guy.
I think we're just going to draw a line under everything now and wait for the next big expense.
tbc
We got a CCTV survey done in the end and it turned out the drain was properly fucked.
There were three problems:
The poorly-fitted rat gate where our run met the main sewer was backing up
The T joint where the downstairs soil pipe met the pipe from upstairs hadn't been sealed properly and was leaking
The clay elbow underground where the downpipe turned to run into the sewer was smashed to pieces
Patio dug up, new rat gate installed, new UPVC pipes installed, wallet significantly lightened, confidence in plumbing restored.