Figuring out radon mitigation cost often surprises homeowners because it's not just about the equipment; the price hinges on your home's size, foundation type, and how much labor is needed to install sub-slab depressurization or seal cracks. You might spend anywhere from $800 to $2500, but older homes with complex crawl spaces can push that higher, and it's money well spent for cutting your lung cancer risk from that invisible, radioactive gas. radon mitigation cost 12