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There definitely isn't one as the conservatory was put up in 1994, and buildover agreements came in with the transfer for public drains to the water companies in 2011.
Prior to that it was agreed as part of the building regs sign off from the council.
Dicks.
Grumpy_Git-
Yeah, you definitely won't have a buildover agreement, because the owner would be agreeing with themselves (and would also be liable for the repairs). The lack of a buildover agreement is why our purchase fell through recently (much more recent extension) and it was a lack of awareness about the problem that made us bin it.
You actually want the foundation to extend below the drain as that means the load is transferred to the underlying substrate. A shallow foundation would transfer load onto the top of the drain which can then displace/crack and the extra water/sewage could cause subsidence issues (hence why it was covered under building regs). -
yeah this - I checked with work and there was nothing on the systems - I just spoke to my neighbour and look at my neighbours plan for their extension where they found the main
If you want you could get a cctv survey done to check the condition of the drain
hamrack
musa
there most likely won't be one if that old - the foundations aren't that deep generally from speaking to a builder friend