Radon is a naturally occurring radioactive gas that forms from the breakdown of uranium in soil and rock. Colorado has some of the highest radon levels in the United States due to its geology, which means the issue is widespread across the Denver Metro area — including both older homes and new construction.
Because radon is colorless, odorless, and invisible, testing is the only way to know whether levels are elevated inside a home.
Long-term exposure to high radon levels is associated with increased lung cancer risk, making it a legitimate health concern.
New or old, large or small, well-maintained or not.
Two neighboring homes can have completely different radon readings.
Cracks, sump pits, and utility penetrations can allow soil gases to seep inside.
Because of these factors, radon testing is considered a standard part of due diligence in Colorado real estate transactions.
Radon concentration is measured in picocuries per liter (pCi/L).
Often considered within acceptable range under federal guidelines.
Mitigation is typically recommended.
Even levels below 4.0 may be addressed by some homeowners for added safety.
Radon testing is usually performed during the inspection period.
Conducted over several days during the contract timeline.
Placed in the lowest livable area of the home, often the basement.
Windows and doors generally remain closed to ensure accurate results.
Testing is relatively inexpensive compared to the overall home purchase.
Elevated results do not automatically kill a deal. Radon issues are common and usually manageable.
Seller installs a system before the sale is finalized.
Buyer installs mitigation after closing using funds from the seller.
Sometimes part of broader inspection negotiations.
Because solutions are well established, radon rarely becomes a deal-breaker on its own.
Mitigation systems reduce indoor radon levels by venting soil gases outside the home.
Installed through the foundation to draw gases from beneath the home.
Continuously pulls radon from the soil.
Routes the gas safely above the roofline.
When properly installed, these systems can significantly reduce radon levels.
Radon mitigation is generally viewed as a manageable home improvement.
Often modest relative to major repairs.
Systems run continuously but use minimal electricity.
Homeowners may test periodically to confirm effectiveness.
Many homes with mitigation systems sell without issue.
New homes are not immune to radon.
Installed during construction but may need activation.
Sealing and ventilation measures built into the foundation.
Even with these features, testing is still recommended.
Because radon is so common statewide, both parties are usually familiar with the issue.
Local norms and negotiation strategy influence the final approach.
Radon is a serious but manageable issue and should be treated as a routine part of home buying in Colorado rather than a red flag.
Testing provides clarity, and mitigation systems offer an effective solution when needed.
If you are purchasing a home in the Denver Metro area, including radon evaluation in your inspection plan can help ensure your home is both safe and comfortable long-term.
For guidance on inspections, testing, and negotiation strategies, consider consulting with experienced professionals familiar with local conditions.
This content is provided for general informational purposes only and should not be considered financial, legal, tax, or real estate advice. Real estate decisions depend on individual circumstances, market conditions, and applicable laws, which may change over time. For guidance tailored to your situation, please reach out for a personalized consultation. If additional expertise is needed, we can connect you with trusted local lenders, attorneys, inspectors, contractors, and other qualified professionals.
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