Cast-iron pipe replacement won't break the bank
A plumber came by recently to look at a problem in our kitchen but when we showed him our garage with our 1936 overhead drainpipes he gasped at our old bell-style cast-iron pipes and said they were severely corroded.
The one thing you don't mention is the sewer lateral - the underground portion of the drain system that empties into the city sewer.
Replacement of the lateral is also a possibility and a can be a big-ticket item.
The next generation was no-hub cast iron with joints sealed by a stainless steel-and-rubber coupling.
A steel band similar to an auto's radiator clamp sealed the joint.
[...] today either ABS or PVC plastic drain, waste and vent lines are the norm in most areas.