If you’re buying a home—whether new construction or a resale—you probably have a long checklist of things to inspect. But one crucial test that often gets overlooked? Radon testing.
Radon is an invisible, odorless, and tasteless radioactive gas that can seep into homes without warning. It’s a leading cause of lung cancer in the U.S., and North Carolina homes are not exempt from the risk. Whether you’re building a brand-new house, renovating an older home, or purchasing an existing property, radon testing should be a priority. Here’s why—and what you need to do to protect yourself and your investment.
What is Radon & Why Should You Care?
Radon is a naturally occurring gas that forms when uranium in soil and rock breaks down. It enters homes through:
Cracks in the foundation
Gaps around pipes and drains
Crawl spaces and unfinished basements
Well water (in some cases)
While radon exists outdoors in small, harmless amounts, indoor concentrations can become dangerously high, increasing your risk of lung cancer. The Environmental Protection Agency (EPA) estimates that radon exposure is responsible for 21,000 lung cancer deaths each year, second only to smoking. In North Carolina alone, radon exposure is estimated to cause about 450 lung cancer deaths annually (ncdhhs.gov).
North Carolina & Radon: Are Homes at Risk?
Yes! According to the North Carolina Radon Program, 77 of North Carolina’s 100 counties have reported elevated radon levels (wral.com). Mecklenburg County, which includes Charlotte, has been flagged as an area with moderate to high radon potential.
📌 Fact: 11% of tested classrooms in North Carolina have radon levels above the EPA’s action level of 4 pCi/L, proving that the risk isn’t just limited to homes (ncdhhs.gov)
Buying a Home? Why Radon Testing is a Must
Resale Homes: Is Radon Testing Required?
Radon testing is not required by law in North Carolina when buying or selling a home, but sellers must disclose known radon issues. However, many homes have never been tested, so it’s up to buyers to ensure testing is done.
🔹 When to Test:
During the home inspection period.
If the home has a basement, crawl space, or slab foundation (all can be vulnerable).
If the home is in a region known for radon presence.
🔹 Who Pays for the Test?
Buyers typically cover the cost of radon testing, but you can negotiate this with the seller.
If levels are high, a mitigation system should be installed before closing, or the seller may offer a credit to cover the cost.
Radon in New Construction Homes: Are You Safe?
Many people assume new homes are safe from radon—but that’s not true. In fact, energy-efficient, airtight construction can actually trap radon inside more easily than older, drafty homes.
Radon-Resistant Building Techniques
If you’re building a home, ask your builder about radon-resistant construction methods. Some techniques include: ✅ A gas-permeable layer beneath the foundation. ✅ A vent pipe to redirect radon away from the home. ✅ Sealing all foundation cracks and openings. ✅ Installing a passive radon mitigation system, which can be upgraded to an active system if needed.
📌 Pro Tip: Even if your builder uses radon-resistant methods, you should still test your home after moving in! Levels can vary, and a system may need activation
What If Radon Levels Are High? How to Fix It
The good news? Radon problems are fixable. A professional radon mitigation system can reduce radon levels by up to 99%. Here’s what to expect:
🔹 Radon Mitigation System Installation:
Costs between $1,000-$2,500 in North Carolina, depending on the home’s design.
Uses a ventilation pipe and fan system to safely direct radon out of the home.
Requires regular maintenance to keep it functioning properly.
🔹 Ongoing Testing:
Test every two years, even if you already have a mitigation system.
Test after major renovations, as construction can alter radon levels.
The Bottom Line: Protect Your Home & Your Health
Radon is a silent risk that too many homeowners ignore—but testing and mitigation are simple steps that can make a world of difference. Whether you’re buying, selling, building, or renovating, radon testing should be on your checklist.
For a visual overview and more information, consider watching this brief video by the North Carolina Department of Health and Human Services: https://youtu.be/j7f8E7Aj6Co
Thinking about buying or building a home in North Carolina? Let’s make sure radon isn’t an issue. I’ll help you navigate the process and ensure you’re making a safe and smart investment. Call or text me today at 980-480-6480!
Until next week,
Evie DeJesus
Your trust local Real Estate Advisor
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