Cheap enough to fit a syphon with integral overflow thus doing away with the
problem of where to discharge to.
Should not take long to do either provided you have a reasonable idea of
what to do.
"James B" wrote in message
...

Can a WC overflow be plumbed unto a sink waste-pipe without raising
issues with surveyors and building inspectors? If so, How about into
the WC's soil pipe? I guess running it through a wall to spill onto a
public pavement would be a no-no, since it could turn to ice on the
pavement and cause an accident, right?

I once saw one WC overflow that ended inside an ajacent shower
cubicle. Is that considered acceptable?

Thanks

James B