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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).
hamrack
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.