Seena~ Be sure to check on Angie'sList.com to see if the lateral sewer company you are working with is not ripping you off. Get a couple of free camera inspections, as you will learn which roots are tearing up your sewer pipe and can modify/eliminate that if you wish. My quotes varied hugely ($4800 to $14,500 for same job.) Ask if you can get by for a few years with regular cleanouts. The new laterals are all one piece hard, flexible pipe that gets pulled through your existing pipe without tearing up walkways. I had mine done for just under $5k after living with the issue (cleanouts every two years, then every year and a half, then every 13 months...) as it deteriorated and I saved my pennies. Yours may be "livable" with a similar annual cleanout. The company I chose gave me a small senior discount - they did a great job here in Pinole, and the inspectors were impressed (yes, you have to have city inspectors all along the process, which should be included in your quote.) They were called Streamline Plumbing, and I was told by "Greg" that they do no regular plumbing, just lateral replacements. Good luck in the muck.