You may dig up to repair your building sewer by traditional methods such as by hand or with a backhoe. You may also use trenchless pipe repair. In this method, 4” polyethylene pipe is pulled through the old pipe leaving a brand new building sewer within the old building sewer. Trenchless pipe repair costs less than traditional methods if your building sewer is deep in the ground. It is helpful as well when you do not wish to disturb your yard or driveway.