Sewer line inspections. Most home inspection companies do not inspect the sewer and plumbing leaving your property. Tree roots are common in older homes and can cause blockages and collapse of the clay pipes . If you're are purchasing a home it is a good idea to get the sewer inspection from a plumber. It's good to know that you have sewer issues that can be very expensive to repair. Depending on the line a replacement can be easily over $10000 if not more if you have to go into the streets. You are responsible for the line leaving your house all the way to the connection to the city. An outside clean out access starts at $3000 and can be more depending on depth of the line.