Radon Mitigation Cost Estimator
Free radon mitigation cost estimator. Get an installed-cost range for active sub-slab depressurization from home size, foundation type, and region.
Radon mitigation cost in high-risk states
The states below are the 10 highest-radon-risk states in the U.S. by EPA Zone 1 county percentage. Each page links to certified mitigators and explains the state-specific factors:
Iowa
100% Zone 1 — the highest-radon state.
North Dakota
100% Zone 1 — glacial geology.
Wyoming
91% Zone 1 — mountain bedrock.
Montana
88% Zone 1 — granite and shale.
Colorado
83% Zone 1 — Front Range geology.
Minnesota
78% Zone 1 — basement-heavy housing.
Maine
75% Zone 1 — granite bedrock and well water.
Pennsylvania
73% Zone 1 — the Reading Prong.
South Dakota
73% Zone 1 — glacial soil and bedrock.
Indiana
62% Zone 1 — central and southern hot zones.
Quick answer
Active sub-slab depressurization for a typical home: $1,200-$2,500 installed, including the fan, sealing, and exterior PVC stack. Multi-level or multi-zone homes can reach $4,000-$5,000. Annual operating cost is ~$50-$100 in electricity. EPA-recommended action level is 4 pCi/L; mitigation typically reduces 4-20 pCi/L homes to under 2.
Radon Mitigation Cost Estimator
How it works
Most radon mitigation systems use sub-slab depressurization: a fan pulls air from below the foundation and vents it above the roofline, creating negative pressure that prevents radon from entering the home. Cost depends mainly on the foundation type (basement is easiest, slab and mixed foundations cost more) and how easy the discharge run is.
When to use it
After a radon test comes back at 4 pCi/L or higher (the EPA action level), or as a precaution if your home is in a high-radon zone (most of Indiana is in EPA Zone 1).
Common mistakes
Skipping the post-mitigation test. Always test again 30 days after installation to confirm the system actually brought levels below 4 pCi/L. Also: hiring an unlicensed contractor — Indiana licenses radon mitigators specifically.
How radon mitigation cost works
The standard system is active sub-slab depressurization (ASD): a PVC stack penetrates the slab, an inline fan creates negative pressure under the foundation, and gases vent above the roofline. Material costs are modest (~$300-$500). Labor and contractor margin make up the rest. Cost varies with foundation type (slab on grade vs. basement vs. crawlspace vs. mixed), system complexity (one suction point vs. multiple), and access difficulty. The calculator estimates installed cost from these inputs.
When to use it
Budgeting after a radon test result over 4 pCi/L (the EPA action level). Comparing contractor bids for reasonableness. Evaluating real estate inspections that flag radon — knowing the typical cost helps with negotiation. Planning new construction radon-resistant features ($300-$500 added cost upfront vs. $1,500+ retrofit).
Common mistakes
- Skipping the post-mitigation test. ASD systems should reduce levels to under 2 pCi/L. Always retest 30-90 days after installation to verify the system is working.
- DIY-ing without proper training. Improperly designed systems can fail to reduce radon or even concentrate it elsewhere in the home. Hire a certified mitigator (NRPP or NRSB credentials).
- Assuming low-end pricing covers a complex home. Multi-zone homes, encapsulated crawlspaces, or homes with high baseline levels (10+ pCi/L) often need system designs beyond the basic ASD. Get a written design plan.
Frequently asked questions
How much does radon mitigation cost?
$1,200-$2,500 for a typical single-family home with active sub-slab depressurization. Multi-level or complex homes can reach $4,000-$5,000. Costs vary by region and system complexity — get 3 bids and compare.
How long does radon mitigation last?
The system itself is permanent infrastructure. The fan typically lasts 5-10 years and costs $200-$400 to replace. Annual operating cost is $50-$100 in electricity. Properly designed systems should reduce levels for the life of the home.
Will the system reduce my radon below 4 pCi/L?
A properly designed and installed ASD system typically reduces levels by 50-99%. EPA expects most installations to drop below 2 pCi/L (well under the 4 action level). Always test after installation to confirm.