A sewer scope inspection is essential for older homes because underground lateral lines are often constructed from legacy materials like clay, cast iron, or orangeburg that naturally degrade over time. Over decades, these aging pipes become exceptionally vulnerable to tree root intrusion, shifting soil, cracking, and internal corrosion, all of which can lead to severe blockages or complete structural collapse. Because main sewer line repairs or full replacements require extensive excavation and routinely cost thousands of dollars, a pre-purchase camera inspection provides vital visibility into the hidden condition of the pipe, protecting you from sudden, biohazardous backups and giving you critical leverage to request repairs or credits before closing.