Basement
$900–$1,800
Usually simpler pipe routing and fan placement.
Illinois Radon Mitigation Cost
Costs in Illinois are usually driven by home setup, not by state-level pricing. Standard systems are commonly in the $800–$1,500 range. More complex installations are often $1,500–$3,000.
EPA Zone 1 — High Radon Potential
Illinois is classified as EPA Zone 1, meaning radon levels are commonly elevated across the state. Mitigation is widespread here, and local contractors are experienced with regional soil and foundation conditions. FindRadonPros lists 43 radon professionals in Illinois. 15 hold verified radon certifications.
Factors that affect your final cost
- Home size: Larger footprints often need longer pipe runs and more labor.
- Foundation type: Crawlspaces can require sealing work that raises the total price.
- Measured radon level: Higher levels can require more robust system design.
- System type: Basic sub-slab systems are usually cheaper than custom or mixed-foundation setups.
Cost by foundation type
Crawlspace
$1,200–$2,500
Sealing and membrane work can add labor and materials.
Slab
$800–$1,700
Often straightforward when slab access is clear.
What a typical quote should include
- System design plan and installation scope
- Fan model details and expected noise level
- Sealing and finish work included in writing
- Post-installation test plan
- Warranty terms for parts and labor
How to compare quotes from multiple contractors
- Get at least 2-3 written quotes with the same scope.
- Compare fan placement, pipe routing, and warranty details line by line.
- Confirm post-install test is included and ask how results are documented.
- Do not choose on price alone. Quality of design and follow-up support matters.
Top contractors in Illinois
- The BrickKicker Chicagoland
Lisle, Illinois • 4.9★ Google
- Chicagoland Home Inspectors Inc.
Chicago, Illinois • 5.0★ Google
- House Call Chicago
Chicago, Illinois • 5.0★ Google
- Expert Home Inspectors Inc.
Chicago, Illinois • 5.0★ Google
- City Home Inspectors, LLC
Oak Park, Illinois • 5.0★ Google
- Chicago Building Inspections
Chicago, Illinois • 5.0★ Google
FAQ
How much does radon mitigation cost in Illinois?
Most homes in Illinois are quoted in the $800–$1,500 range for standard installations, while more complex homes can run $1,500–$3,000. Illinois is classified as EPA Zone 1 (high radon potential), so mitigation is common and contractors are experienced with local conditions.
How many radon contractors are available in Illinois?
FindRadonPros currently lists 43 radon professionals in Illinois. 15 have verified radon certifications. The average Google rating is 4.8.
Is mitigation worth it?
In most cases, yes. Mitigation lowers radon exposure and can make home sales easier when buyers request radon results.
Does insurance cover it?
Usually no. Most homeowners pay out of pocket, but comparing bids from multiple contractors helps control total cost.
How long does installation take?
Most standard jobs are completed in a day, while complex layouts can take longer depending on routing and sealing needs.
What affects the final price?
Home size, foundation type, measured radon level, and system design are the biggest cost drivers.