Most Greater Cincinnati homes pay $1,200 to $2,400 for an active sub-slab radon system. Crawl spaces with a sealed membrane run $1,800 to $3,500, and adding a fan to an existing passive radon pipe runs $700 to $1,200. A professional test is typically $150 to $300.
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Where a quote lands inside that range depends on the house more than the neighborhood. A slab home with a short pipe route to an outside fan sits near the low end. A basement that needs interior routing through finished rooms, extra sealing of hollow block walls, or a second suction point sits near the top, and a split-level or an addition built over a crawl space can reach $2,000 to $4,500. Our pricing by foundation type breaks this out tier by tier, and the radon cost calculator gives a range for your foundation and square footage. As a national check, HomeGuide's February 2026 cost guide puts a typical active soil depressurization install at $1,200 to $2,000 with an average near $1,600, and EPA says most homes can be fixed for about the cost of other common home repairs. In Ohio, a written proposal has to follow an in-person inspection and must state both the installation price and an estimate of the system's annual operating cost, so a firm price given over the phone without a visit is a warning sign. Plan for small ongoing costs as well: HomeGuide estimates fan electricity at roughly $70 to $80 a year, and EPA puts a future fan replacement at around $200 to $350 including parts and labor. Our answer on what affects mitigation cost covers the individual cost drivers.