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How Much Does Radon Mitigation Cost in Illinois? — 2026 Guide

Radon testing and sub-slab depressurization systems.

Average cost range

$900–$2,500

for a typical mitigation system

Cost factorImpact on price
Foundation typeSlabs, crawlspaces and basements vary.
Soil permeabilityTight soils may need more suction points.
Pipe routingInterior versus exterior routing affects cost.
SealingSump lids and crack sealing add cost.
TestingPost-mitigation testing confirms results.
Typical range$900–$2,500 for a typical mitigation system

Two similar-looking jobs can be priced very differently once materials, access and local labor rates in Illinois are taken into account, so the most reliable number is a written quote for your project.

Typical U.S. ranges from industry sources (2024–25); not EdgeLocal data. Your quote will vary with scope, materials and location.

EdgeLocal lists 119 radon mitigation in Illinois and 410 across all locations.

Find radon mitigation in Illinois

How to get quotes

  1. Describe your project once: what needs doing, your ZIP code and your timeline.
  2. EdgeLocal sends your request to local radon mitigation who cover your area.
  3. Compare two or three written quotes on scope, materials, timeline and warranty — not just price.

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What affects the cost

  • Foundation type
  • Fan placement and pipe routing
  • Number of suction points
  • Sealing cracks and sump covers
  • Post-installation testing

Questions to ask before you hire

  • Are you certified for radon mitigation in this state?
  • Will you retest after installation to confirm levels dropped?
  • Can you show proof of general liability insurance and, if you have employees, workers’ compensation coverage?
  • Will you give me a written, itemized estimate and a written contract before work starts?
  • What warranty do you offer on labor, and who handles manufacturer warranty claims?

Verify your contractor

Iowa requires contractors doing residential construction over $2,000 to be registered with the Iowa Division of Labor under Iowa Code Chapter 91C. Before you sign, check the registration number on the estimate against the state registry.

Look up an Iowa contractor registration

What radon mitigation do

Radon mitigation contractors perform radon testing, install sub-slab depressurization systems with fans and piping, seal cracks and sump pits, and verify reduced levels with follow-up testing.

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Hiring radon mitigation in Illinois: what to know

Radon mitigation contractors test for and reduce radon gas levels in homes. Radon mitigation contractors perform radon testing, install sub-slab depressurization systems with fans and piping, seal cracks and sump pits, and verify reduced levels with follow-up testing.

Typical U.S. ranges from industry sources (2024–25); not EdgeLocal data. Your quote will vary with scope, materials and location.

How to hire a radon mitigation contractor

  1. Verify state certification. Iowa, Minnesota, Illinois and Nebraska credential radon professionals.
  2. Ask about post-mitigation testing. Confirm levels below 4 pCi/L.
  3. Discuss fan placement. Fans should be outside living space.
  4. Check warranty. Ask about fan and performance warranties.
  5. Ask about system monitoring. Manometers show the system is working.

Red flags to watch for

  • Not state certified where required
  • No post-mitigation test
  • Fan installed in living space
  • Guarantees zero radon

Licensing in Illinois

Radon testers and mitigators must be state-certified in Iowa, Minnesota, Illinois and Nebraska; other states rely on national certification programs.

Illinois has no statewide general contractor license; licensing is handled by cities and counties. Roofers must be licensed by the Illinois Department of Financial and Professional Regulation, and plumbers by the Illinois Department of Public Health. Radon professionals are licensed by the Illinois Emergency Management Agency.

Best time to hire

Radon testing and mitigation are year-round; winter testing often shows higher levels.

Related services

Radon Mitigation cost FAQs

How do I find a good radon mitigation contractor in Illinois?

Compare local radon mitigation on EdgeLocal by Google rating, review count and hours, then request written quotes from at least three. Verify Illinois licensing where it applies.

How much does a radon mitigation contractor cost in Illinois?

Typical U.S. pricing is about $900–$2,500 for a typical mitigation system. Local prices in Illinois vary with labor rates, materials and season — these figures are industry estimates, not EdgeLocal data.

What radon level requires action?

The EPA recommends mitigation at 4 pCi/L or higher.

Is radon common in Iowa?

Yes. Iowa has among the highest average indoor radon levels in the U.S.

How long does mitigation take?

Most systems are installed in one day.

Do radon mitigation need a license in Illinois?

Radon testers and mitigators must be state-certified in Iowa, Minnesota, Illinois and Nebraska; other states rely on national certification programs. In Illinois: Illinois has no statewide general contractor license; licensing is handled by cities and counties.

How do I verify a contractor in Iowa?

Iowa requires contractors doing residential construction over $2,000 to register with the Iowa Division of Labor (Iowa Code Chapter 91C). You can look up a registration on EdgeLocal’s verify page.

Related cost guides

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