A radon mitigation system cost is usually fairly standardized, which makes it easier to spot an outlier quote — but a few details still matter.
What to look for
- System type matched to your foundation — sub-slab depressurization is the most common approach, but crawlspaces and certain foundation types need different systems.
- Fan brand and warranty, since the fan is the component most likely to eventually need replacement.
- Post-installation testing included, to confirm the system actually brought radon levels down, not just that it was installed.
- Independent initial testing — ideally from a source other than the company selling the mitigation system.