Out here, a sewer line replacement quote often covers a lot more than the pipe. The lines run under driveways, RV pads, mature trees, and yards that have been groomed for decades, and a trench through any of it turns a plumbing project into a property project. A failing line in El Cajon can often be rebuilt from the inside, trenchless, and much of the surface may never need touching.
The method is called pipe lining, CIPP formally. A resin soaked liner gets threaded into the existing line, frequently by way of a cleanout, presses tight against the old pipe walls, and cures into a hard new pipe inside the old one. For El Cajon's older clay lines with joints that have worked loose, the fit can be a good one. The new pipe has no joints in the lined section, so roots have fewer seams to find. When a line qualifies, the contractor will lay out the schedule and what, if anything, the driveway needs.
Lining requires a pipe that still holds its shape, and footage from inside the line is how you find out. Some lines qualify and some don't, and you'll see which group yours is in. You get that evidence, the options in plain English, and the decision stays with you, with a licensed contractor performing the work when you say go. Before anyone digs up the yard, it's worth a look inside the pipe.