Most jobs start with clearing the line enough to run a camera, then a recording that shows the pipe material, the trouble spots, and their distance from the cleanout. From that, the plumber can say whether a spot repair, lining, or full replacement fits.
Pipe replacement needs a plumbing permit through the Building Department's OpenGov portal. If the work goes beyond your yard, expect DPW trench or road opening permits, and digging near the street may also involve curb cutting. Ask the plumber to walk you through which permits apply to your lot.
Abington's housing runs from pre-1940 homes through 1950s construction to much newer houses, and lateral lengths and depths vary a lot from lot to lot, so the camera footage shapes the plan more than any rule of thumb.