Just thought I'd pass on some info.
We just HAD to replace our sewer line in 40yr old house. Big maple tree in the front yard had decided that our main line was a fine place to find water and nutrients. We've been in the house for a little over a year and had to snake the line something like 6-7 times after it flooded the basement (YYYUUUCCCCKKKK!) The last time occurred after only about 1 month since the previous cleaning.
We had the line scoped and found about three places where the tree roots were getting into the line. Of course one of the locations was about 6-8 ft into the street. No chance of just replacing the line out to the sidewalk and actually fixing the problem. We gotta go all the way to the middle of the street.
Looking into contractors, we found a couple companies that do "trenchless" replacements. They dig a hole at each end and use a hydraulic ram to pull the new pipe through the old one. A wedge over the end of the new pipe shatters the old clay pipe and shoves it out of the way.
Two days of work and everything is back together. Our front yard didn't get tore appart, and now I can forget about wondering if I'm going to find water standing in the basement every time I go down there.
I can't say the $6500 bill was to my liking, but there wasn't much way around it. Companies that were going to dig the trench were going to be in the $9k range.
If anyone else is in the same kind of situation facing replacing their sewer line, check into this. Might save you some $$