Radon Mitigation Cost Calculator
What a radon mitigation system costs to install depends most on the system your foundation needs, a sub-slab system for a slab or basement, a sub-membrane system for a crawlspace, or a simpler upgrade to an existing pipe, and on how many suction points the house takes. This calculator gives you a rough budgeting range from those, using national averages published by third-party sources, which are named below. It is a starting point, not a quote.
The system follows the foundation: slab, basement, crawlspace, or an existing pipe.
Most homes need one. A large or divided foundation can take more.
Estimated range
$800–$2,800
- Sub-slab system$800–$2,800
These are national averages, not a Peerless Environmental quote.
How This Estimate Is Built
The calculator starts from a published national range for the system type you pick, then adds a figure for each suction point beyond the first and for the extras you select: crack sealing, concealed routing, a permit, and the fan's electrical hookup. Most homes are mitigated with a single suction point, but a large or compartmentalized foundation can need more, and each one adds a core hole, a pipe run, and a sealed connection. Published rates are ranges, so the result is a range too, and a wide one reflects how much foundations genuinely differ.
Where These Numbers Come From
The rates here are national averages published by consumer cost guides and radon-mitigation firms. They are not Peerless Environmental prices, and we did not set them. Where sources disagreed we show the full span, and where one folded moisture encapsulation or dehumidification into a radon figure we left that number out rather than let it inflate the range. What your system actually costs depends on the foundation and how the sub-slab behaves, which is what a site review is for.
What the Calculator Cannot See
The single biggest variable in a radon system cannot be typed into a form: how well the air moves under the slab. A house where one suction point pulls from the whole footprint is mitigated cheaply; one where the sub-slab is broken up by footings and poured sections may need several points to reach every pocket, and there is no way to know which you have until an installer runs a pressure-field test. The calculator lets you add suction points to see the effect, but how many you actually need is a diagnostic finding, not a menu choice.
Which System Your Foundation Needs
The system follows the foundation. A slab or basement usually gets active sub-slab depressurization, a fan drawing radon from under the floor and venting it above the roofline. A crawlspace gets a sub-membrane system, a sealed vapor barrier over the soil with the fan pulling from beneath it, which is why it runs higher. A home with existing drain tile or a sump pit can often tap that drainage for less. And a house that already has a passive stack, common in newer construction, may only need a fan added to turn it active, the cheapest route of all.
Why DIY Radon Mitigation Is Risky
A DIY kit is the cheapest line on this page, and it is where the honest advice diverges from the price. A radon system is not just a fan and a pipe: it has to draw from the right spot, seal the slab so it pulls suction instead of house air, and discharge above the roofline where the radon cannot re-enter. Get any of that wrong and the system can fail to lower the radon, or move it somewhere worse, and you would never know without testing. If you do the work yourself, a post-install test is not optional. Most homeowners have a certified installer size the fan and set the suction, then confirm the result. Peerless Environmental provides radon mitigation across the Southeast.
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Common Questions
How much does a radon mitigation system cost?
Most residential systems run about $800 to $2,500 installed, with a typical single-suction-point job around $1,500. A sub-slab system for a slab or basement sits in that range; a crawlspace sub-membrane system runs higher, roughly $1,200 to $3,500, because it includes a sealed vapor barrier; and adding a fan to an existing passive pipe can be as little as $500 to $1,000. A home that needs several suction points costs more.
Why is a crawlspace radon system more expensive?
A crawlspace does not have a slab to draw from, so the installer lays a sealed vapor barrier over the soil and pulls radon from beneath it, a sub-membrane system. The membrane, the sealing, and the labor of working in a tight space push the cost to roughly $1,200 to $3,500, above a typical sub-slab job. If the crawlspace also needs full encapsulation or a dehumidifier for moisture, that is separate work and not in these figures.
How many suction points will my home need?
Most homes are mitigated with one, but it depends on how the air moves under the slab, not on the home's size alone. A slab broken up by interior footings or poured in separate sections can trap radon in pockets a single point cannot reach, so the installer runs a pressure-field test to find out how far one point pulls. Each additional suction point adds roughly $300 to $600. How many you need is a diagnostic finding, which is why a site review matters.
Can I install a radon mitigation system myself?
You can buy the materials for roughly $350 to $900, but it is the one part of radon work we would steer you away from doing blind. A system that draws from the wrong spot, fails to seal the slab, or vents too low can leave the radon as high as before, or move it somewhere worse, and the only way to know is to test afterward. If you install it yourself, treat a post-install test as mandatory. Most homeowners have a certified installer handle the fan sizing and suction.
What happens after a failed radon testDoes this calculator give me a price from Peerless Environmental?
No. Every rate here is a national average published by a third-party source, shown so you can budget before you talk to anyone. Peerless Environmental provides radon mitigation across the Southeast; what your system actually costs depends on the foundation, how the sub-slab behaves, and how many suction points it takes, which a site review confirms.
Request a site reviewDo radon systems need a permit?
Sometimes, depending on the jurisdiction. Where one is required, a permit and inspection add roughly $50 to $300, and wiring the fan to its own circuit adds another $50 to $200 or so. Both are optional line items in the calculator because whether they apply comes down to local code and whether an electrician is needed. A certified installer will know what your area requires.