Rockford, Illinois
Radon Testing & Mitigation Cost in Rockford, IL (2026 Prices)
Updated
Radon testing in the Rockford area typically runs $150 to $300, depending on short-term vs. long-term monitoring. A full mitigation system generally runs $800 to $2,000, depending on the foundation and house size. Replacing a mitigation fan alone, nationally, runs about $200 to $600, averaging around $350 (Angi, updated 2026-03-18).
Get a fixed price for your property
Tell us the town and why you're testing. You get a real number back, not a range.
Testing price depends on short-term vs. long-term monitoring. Mitigation system cost depends on foundation type and house size. Get a firm number before anything is scheduled.
Price by job type
| Job | Typical price | Source |
|---|---|---|
| Short-term radon testing | $150–$300 | Regional market data, gathered 2026-09-01 |
| Long-term radon testing | $150–$300 | Regional market data, gathered 2026-09-01 |
| Radon mitigation system (installed) | $800–$2,000 | Regional market data, gathered 2026-09-01 |
| Mitigation fan replacement only | $200–$600 (avg $350) | Angi, national, updated 2026-03-18 |
What changes the price
| Factor | Effect |
|---|---|
| Short-term vs. long-term testing | Long-term monitoring (90+ days) generally costs more than a short-term device left for a few days to a week. |
| House size | Larger homes sometimes need more than one testing device placed to get an accurate read, which raises the total. |
| Foundation type | A basement or slab-on-grade foundation is usually one suction point. A crawl space can need a sealed vapor barrier in addition to the vent system, which adds to a mitigation job's cost. |
| Timeline | A rush test scheduled around a closing deadline with little notice can cost more than one booked weeks out. |
| Full system vs. fan only | If an existing mitigation system's fan has failed but the vent piping is still good, replacing just the fan is a smaller job than a full new system. |
What does not change it
The price for the test itself does not change based on what the result turns out to be. A high reading does not mean a higher bill for the testing service; mitigation, if needed, is a separate, clearly priced job you agree to on its own.
- Short-term vs. long-term testing method
- How many testing devices the house needs
- Timeline: a rush test for a closing deadline vs. no time pressure
- Whether a mitigation system is also needed after a high result
- Foundation type: slab, crawl space, and basement systems differ
Common questions
Cost questions
Is the price different for a real estate transaction?
The testing method (usually short-term, to fit a closing timeline) is the main factor, not who's requesting it. A rushed test scheduled with little notice may cost more than one booked weeks out.
Do I pay before or after the test?
That depends on the arrangement made when booking, but the price is agreed upfront either way; there is no surprise number after results come back.
What if I need a mitigation system installed?
That's a separate service with its own price, quoted once a high result is confirmed and the foundation type is assessed. See the radon mitigation page for how that process works.
Does testing a bigger house cost more?
Larger or more complex homes sometimes need more than one testing device to get an accurate read, which affects the total.
How much does it cost to replace a radon fan?
Nationally, fan replacement runs about $200 to $600, averaging around $350 (Angi, updated 2026-03-18). A licensed Illinois radon contractor can confirm the number for a specific fan and system.
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Tell us why you're testing and any deadline you're working against. You get a fixed price and a straight answer back.