Cincinnati radon mitigation cost by foundation type (2026)
Most Greater Cincinnati and Northern Kentucky homes pay $1,200 to $2,400 for an active sub-slab radon system, and the foundation under the house decides where in that range a written quote lands. The table below is our 2026 pricing guide by foundation type, the same ranges behind our radon cost calculator, with what each tier typically includes.
How these ranges compare. HomeGuide's February 2026 national cost guide puts a typical active soil depressurization system at $1,200 to $2,000 installed, with an average near $1,600 and a full span of $500 to $8,000 for unusual houses. The Minnesota Department of Health gives $1,500 to $3,000 as a general range. EPA avoids dollar figures and says most homes can be fixed for about the same cost as other common home repairs.
Why a written quote can differ from the table. In Ohio, a licensed mitigator has to inspect the house before writing a proposal, and has to run a communication test where the material under the slab is unknown. What that visit finds, including how far suction spreads, how much sealing the floor and walls need, and where the pipe can run, sets the final number. Every install here is performed by an NRPP- or NRSB-credentialed mitigator and quoted in writing after that visit.
| Foundation or item | Typical cost | What it typically includes |
|---|---|---|
| Slab on grade | $1,200 to $1,800 | One suction point cored through the slab, a short pipe route to a fan outside the living space, sealing of slab joints and plumbing penetrations, a pressure monitor, and labels. |
| Poured concrete basement | $1,200 to $2,400 | Usually one suction point. Urethane sealing along the floor-to-wall joint, an airtight sump cover if there is a pit, and routing either up the outside wall or through a closet or chase to an attic fan. |
| Hollow block basement | $1,800 to $3,000 | Block walls add work: Ohio requires their open tops to be closed and sealed, and cracked block needs more sealing. HomeGuide lists block-wall systems at $1,800 to $3,000 nationally. |
| Crawl space (sub-membrane) | $1,800 to $3,500 | A soil gas retarder of at least 6-mil polyethylene over the dirt floor, seams overlapped 12 inches and sealed, fastened to walls and piers, with suction drawn beneath it. |
| Basement or slab plus a crawl space | $2,000 to $4,500 | Split-levels and additions built over a crawl need suction in more than one area, often joined to a single fan. |
| Larger homes, over 2,500 sq ft | Add about $200 to $500 | More slab area can mean a second suction point, longer pipe runs, or a larger fan. |
| Existing passive radon pipe | $700 to $1,200 | Adding a fan, pressure monitor, electrical circuit, and labels to a vent pipe the builder already ran through the house, after confirming it reaches the gravel under the slab. |
| Radon fan replacement | About $200 to $350 | EPA figure including parts and labor. Fans may last five years or more, and manufacturer warranties tend not to exceed five years. |
| Professional short-term radon test | $150 to $300 | A 48-hour or longer test by an Ohio-licensed tester or Kentucky-certified measurement contractor. HomeGuide lists $125 to $400 nationally. |
| Fan electricity | About $70 to $80 a year | HomeGuide estimate; the fan runs continuously and draws about as much power as a 60-watt bulb. |
| Radon in well water, carbon system | $1,200 to $1,800 | HomeGuide range for a granular activated carbon tank. EPA recommends carbon for moderate levels, around 5,000 pCi/L or less in water. |
| Radon in well water, aeration system | $4,000 to $5,000 | HomeGuide range. EPA rates aeration at 95 to 99 percent reduction; it vents the radon outdoors and needs annual cleaning. |
What an Ohio proposal has to include
Ohio's Radon Mitigation Standards set the minimum contents of a written proposal. Before you sign, check that it:
- states the installation price and an estimate of the annual operating cost
- describes any maintenance you will be responsible for
- guarantees to bring the average below 4.0 pCi/L and states the conditions, or explains why there is no guarantee
- says whether the same licensee tested the house or gave the advice that led to the job, and mentions the benefits of long-term testing
EPA's Consumer's Guide adds items worth asking for: the total cost including taxes and permit fees, the deposit and when the balance is due, the time needed to finish, an agreement to obtain permits and follow code, proof of liability insurance, and responsibility for damage and cleanup.
Red flags in a quote
A firm price over the phone with no visit. Ohio requires an inspection before a written proposal. A phone range is useful; a phone contract is not.
A fan in the basement or living space. Ohio's standards allow the fan only in an attic, a garage that is not beneath living space, or outdoors.
No monitor, no labels, or no plan for the post-mitigation test. Every active system needs a monitor, and the post-mitigation test should run no sooner than 24 hours and no later than 30 days after the fan starts.
A license you cannot find. Ohio mitigation contractors appear on ODH's radon licensure map, and Kentucky contractors must hold NRPP or NRSB certification and state registration.
To see where your home is likely to land, try the radon cost calculator, read our Cincinnati cost answer, or see what the radon mitigation systems scope includes. Call or text us with your foundation type and test result, and we will give you a range before anyone visits.
Data sources
- HomeGuide, Radon Mitigation Cost (February 2026)
- HomeGuide, Radon Testing Cost
- Minnesota Department of Health, Radon Mitigation Systems
- US EPA, How do I know if my radon mitigation system is working properly?
- US EPA, Consumer's Guide to Radon Reduction (PDF)
- Ohio Administrative Code 3701-69-08 and Ohio Radon Mitigation Standards
- Ohio Department of Health, Hire a Professional
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