How much does radon mitigation cost in the Triangle?

A standard sub-slab system typically runs about $800 to $2,000 in the Triangle area. Complex homes with multiple foundation types, a crawlspace, or multiple suction points run higher, roughly $2,000 to $4,000. Testing first is cheap and comes before any of this.

Do I have radon in the Raleigh Triangle?

You can't know without testing. Radon comes from the soil and varies dramatically house to house, and even neighbors can test very differently. Parts of the NC Piedmont do produce elevated radon, so testing is the sensible step, and a short-term kit costs very little.

What radon level needs mitigation?

The EPA's action level is 4 pCi/L. At or above that, a mitigation system is recommended. Below it, you may still choose to reduce it, since there's no completely safe level, but 4 pCi/L is the standard trigger.

Radon Testing & Mitigation in the Raleigh Triangle

Radon is a naturally occurring radioactive gas that seeps up from the soil into homes. You can't see or smell it, and it's the second-leading cause of lung cancer after smoking. The fix is simple once you know you have it: a mitigation system vents it from under the slab or crawlspace to the outside.

Why it matters in the Triangle

Radon comes from uranium in the soil and rock, and parts of the North Carolina Piedmont sit on the kind of granite and bedrock that can produce it. What's worth knowing is that radon varies enormously from house to house. Two homes on the same street can test completely differently, because it depends on the soil and how your specific foundation draws air. That's why you test rather than assume. A short-term test kit is cheap, and mitigation only makes sense once a test shows elevated levels.

Signs you need it

•You've never tested, and the only way to know is a test, since radon has no smell or color
•A home inspection or real-estate test came back at or above 4 pCi/L (the EPA action level)
•You're buying or selling, and a radon test is common in NC real-estate transactions
•You have a crawlspace or a slab and want to rule it out before finishing a basement

What does it cost?

Get a typical Triangle-area range for your project before you talk to anyone.

Open the radon mitigation cost estimator

What the job involves

1.Test first, using a short-term test kit or a professional test to establish your level
2.If it's at or above the EPA action level (4 pCi/L), a mitigation system is warranted
3.For a slab: a sub-slab depressurization system, which is a pipe and a quiet continuous fan that pulls radon from under the foundation and vents it above the roofline
4.For a crawlspace: a sealed membrane with a vent fan drawing from beneath it
5.A post-mitigation test to confirm the system brought the level down

How to vet a contractor

✓Test before you pay for mitigation. A contractor who quotes a system without a test is skipping the only step that tells you whether you need one
✓Ask for a post-mitigation test to prove it worked
✓Ask whether the fan and piping are warrantied, and where the vent terminates (it should be above the roofline)
✓Look for radon-specific certification (NRPP or NRSB) alongside the usual license and insurance

Common questions

How much does radon mitigation cost in the Triangle?: A standard sub-slab system typically runs about $800 to $2,000 in the Triangle area. Complex homes with multiple foundation types, a crawlspace, or multiple suction points run higher, roughly $2,000 to $4,000. Testing first is cheap and comes before any of this.
Do I have radon in the Raleigh Triangle?: You can't know without testing. Radon comes from the soil and varies dramatically house to house, and even neighbors can test very differently. Parts of the NC Piedmont do produce elevated radon, so testing is the sensible step, and a short-term kit costs very little.
What radon level needs mitigation?: The EPA's action level is 4 pCi/L. At or above that, a mitigation system is recommended. Below it, you may still choose to reduce it, since there's no completely safe level, but 4 pCi/L is the standard trigger.