Buried shared sewer with 90 degree bend under garage

[j_s]

Just had Severn Trent out to locate a blockage. Blockage already cleared without intervention (I apologised as should have checked it again). They got the camera out anyway and inspected and found no sign of obvious issues to explain the blockage. They did however find a 90 degree bend under my garage and there is no inspection chamber. This wasn't the issue as the blockage was further down well beyond the bend based upon my kitchen waste gully pot pretty much overflowing too which is 10m the other side of the house that connects further down on the shared sewer run. There is an inspection chamber I believe in next doors garden (lhs of us) where our kitchen waste joins. You could in theory rod from that side but it's around a 10m run to the 90 degree turn. To complicate this our neighbours on the rhs have their waste connect to ours 3m before this 90 degree turn. Pipe diameter is 4" I believe. Severn Trent guys said the buried nature isn't ideal but as its shared they would just deal with it if a problem arose and dig up the garage floor.

My question is, is this not covered by building regs? Property built in 2006/7 and I'm the second owner. Should this stuff not be inspected by building control? It's pretty poor in my opinion and I guess I either be proactive about it and get an inspection chamber fitted somehow but as it's Severn Trent's responsibility they may need to agree but I doubt they would pay for it, or leave it until a problem arises and it gets fixed in an emergency instead. 

 

Any thoughts? 

[PeterW]

Was built prior to the adoption rules for sewers but I can guarantee it was probably covered over before the BCO ever saw it … is it a developer house . Z

[j_s]

Small scale build ( 3 houses). Construction quality was appalling but hidden so not obvious until we moved in. Only just about finishing fixing the problems after starting 4 or 5 years ago. This is now another one. 

Edited November 20, 2022 by j_s