I live in the greater Seattle Area. The rule here, and I am sure in many other places, is that you are responsible for your sewer line all the way to the point of connection to the main. The main usually is out in the Street. The Street is City property. So, why do you have to fix the sewer line under City property… right??? The City will maintain the Sewer Main. You are responsible for connecting to it. And you are responsible for all costs associated to connect to it. When something goes wrong with your sewer line from the house to main and the only repair is to replace it, then you have to pull city permits. You have to jack hammer the street up and repair, replace, inspect, get approval to cover, fix the street, inspect, sign off… IT IS A NIGHTMARE!!!
Or… you can go trenches…See if your condition is something that can be sleeved. Yes, there is a way to sleeve old sewer lines and make them new again. No jackhammers, no permits.