Installing a radon mitigation system can cost anywhere from $800 to $2,500, depending on your home's foundation type and the system's complexity. It's an upfront investment, but you'll also need to factor in annual operating costs for the fan, which adds maybe $150 to your electricity bill. Compared to the long-term health risks of radon exposure, many homeowners find this cost well worth it. I've seen some people try DIY fixes, but professional installation often ends up being more reliable an… radon system cost 12