If it were a public building and it came out at an inquest that the
'manager' knew of a potential hazard and had failed to do anything
about it, then it would surely be him on trial.

A building manager should be properly trained to assess health and safety
risks as part of his overall responsibility for which he/she is paid. In a
domestic situation, the occupants are not deemed to be so qualified and may
need to rely on the competence of contractors carrying out improvement work
to determine what is safe or not.

Christian.