standard cost for sewer line replacement
1 Smaller projects generally cost more per foot. 2  To replace sewer lines less than 50' long, CostHelper readers paid $5,500-$6,800 or $148-$550 per foot for traditional trenching projects, at an average cost of $6,167 or $232 per foot. Replacing an average sewer line from the house to where it connects to the public sewer system typically costs $3,000-$6,000. 2  However, if the project is complex and/or if the connection to the public system is in the middle of the street it can cost $7,000-$25,000 or more.