If the house you're thinking of buying is older than 20 years, it is recommended to video scan the main sewer line. SewerScan is a new service that I offer and it can help identify blockages from tree roots or scale build up and other damages to the main sewer line. Average cost of sewer line repair is $6,000 and a SewerScan can help you avoid a 'crappy' and costly situation. This picture was taken at a 20 year old house and at 72 feet a massive blockage noted. Armed with this photo, the buyer asked the seller to have this blockage removed, saving the buyer roughly $600-$800. SewerScan can help you save money and problems with you main sewer line.