Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Total radon mitigation cost
$950
Base single-point system
$950
Foundation complexity adjustment
$0
Fan capacity upgrade
$0
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How to use this
- 1Enter base single-point system cost ($).
- 2Enter foundation type.
- 3Enter fan capacity.
- 4Read your total radon mitigation cost on the right — it updates as you type.
- 5Hit Share to keep the scenario or send it to someone.
About this calculator
Radon mitigation for most homes uses an active sub-slab depressurization system — a vent pipe routed from beneath the foundation slab up through the house (or along an exterior wall) to a roof-mounted exhaust fan that continuously pulls radon gas from beneath the home and vents it safely above the roofline. This calculator prices the system using a base cost for a straightforward single-point system, an adjustment for house complexity (multiple foundation types like a basement plus a slab-on-grade addition often need multiple suction points), and fan type since some systems need a more powerful fan for larger or leakier slabs. 2026 US national averages run about $800-$1,500 for a basic single-point radon mitigation system on a simple ranch-style slab, and $1,500-$2,500+ for homes with multiple foundation types, crawl spaces requiring a vapor barrier system, or larger homes needing a higher-capacity fan and multiple suction points. Every system should be tested by the installer after completion to confirm radon levels have dropped below the EPA's recommended action level of 4 pCi/L.
Worked example
Using the values the calculator loads with:
Inputs
- Base single-point system cost: 950 $
- Foundation type: Single slab or basement — no extra suction points
- Fan capacity: Standard fan — no upcharge
Results
- Total radon mitigation cost: $950
- Base single-point system: $950
- Foundation complexity adjustment: $0
- Fan capacity upgrade: $0
What each field means
Inputs
- Base single-point system cost ($)
- The base single-point system cost used in the calculation, measured in $. Starts at 950 $ so you have a working example on load. Accepted range: 500–2000 $.
- Foundation type
- Pick the option that matches your situation — the maths changes per option. Choices: Single slab or basement — no extra suction points, Mixed foundation (basement + slab-on-grade) — +$600, Crawl space + slab combo — +$1,100.
- Fan capacity
- Pick the option that matches your situation — the maths changes per option. Choices: Standard fan — no upcharge, High-capacity fan (larger/leaky slab) — +$250.
Results
- Total radon mitigation cost
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Base single-point system
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Foundation complexity adjustment
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Fan capacity upgrade
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
What radon level requires mitigation?
The EPA recommends taking action at 4 pCi/L or higher, and considers mitigation worth discussing with a professional even between 2-4 pCi/L — since radon is the second-leading cause of lung cancer in the US, many mitigation professionals recommend acting at the lower threshold too.
How long does radon mitigation installation take?
A standard single-point system typically installs in a single day (4-8 hours), including drilling the suction point through the slab, routing PVC pipe to the roofline, and installing and testing the exhaust fan.
Does every home need multiple suction points?
No — most single-foundation homes on a continuous slab or basement floor need only one suction point, since the sub-slab gravel layer typically allows suction to pull evenly across the whole area; homes with separate foundation sections (like additions) often need a second point to achieve even depressurization.
Is radon mitigation a one-time cost or does it need ongoing maintenance?
Installation is a one-time cost, but the system uses a continuously running fan (small electricity cost, similar to a light bulb) that has a typical lifespan of 5-10 years and will need periodic replacement, plus most experts recommend retesting radon levels every 2 years to confirm the system is still working effectively.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Radon Mitigation Cost Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/radon-mitigation-cost
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/radon-mitigation-cost" target="_blank" rel="noopener">Radon Mitigation Cost Calculator — RevenueLab</a> (2026).</p>
Source: [Radon Mitigation Cost Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/radon-mitigation-cost) (2026).