How Radon Testing Fits Into a Real Estate Timeline

For real estate transactions, both buyer and seller need Radon test results quickly. Our cute Radon robots agree! Our robots bring a little color and cheer to this guide, helping balance the seriousness of radon in our homes.
An Important Step in the Process
When buying or selling a home, Radon testing becomes one of the important steps in the real estate timeline. Because Radon test results can influence negotiations, inspection deadlines, and peace of mind for both parties, it helps to understand exactly where Radon testing fits into the process. Our cheerful robot friend reminds you to stay organized and keep Radon testing on your calendar.
Where Radon Testing Belongs in the Transaction
Radon testing usually takes place during the home inspection period. This is the window of time when buyers evaluate the condition of the home and decide whether any issues need to be addressed. Because Radon tests require at least 48 hours, and sometimes longer, it is important to schedule the test early in the inspection period so there is enough time to receive results and respond appropriately.
Typical Real Estate Timeline for Radon Testing
Every transaction is a little different, but most Radon testing follows a similar pattern. Here is a simple overview of how Radon testing fits into the typical real estate schedule:
1. Offer Accepted
Once the buyer and seller agree on the purchase terms, the inspection period begins. This is the ideal moment to schedule the Radon test so the device can be placed as soon as possible.
2. Schedule the Radon Test
Buyers or their agents usually arrange the Radon test. A professional tester can often place the device within a day or two. If using a DIY mail-in test, it is best to order the kit ahead of time so it arrives quickly.
3. Radon Test Placement
The Radon device is placed in the lowest livable level of the home. Closed-house conditions must be maintained during the test period. This means keeping windows and exterior doors closed except for normal entry and exit.
4. Test Duration
Short-term tests typically run for 48 to 96 hours. DIY kits may require 2 to 7 days depending on the device. Professional continuous monitors are the fastest option and are commonly used in real estate transactions.
5. Test Pickup and Results
Professional testers retrieve the device and provide results the same day. DIY tests must be mailed to a lab, and results usually arrive within several days. This is why DIY tests require more total time in the transaction timeline.
6. Review and Next Steps
If Radon levels are below 4.0 pCi/L, no mitigation is typically needed. If levels are 4.0 pCi/L or higher, the buyer and seller may negotiate mitigation, credits, or retesting. Because Radon issues are common and fixable, this step is usually straightforward.
Why Timing Matters
Real estate deadlines can be tight, and Radon testing must fit within the inspection period. Scheduling the test early ensures that results are available in time for any needed decisions. Professional testing is the fastest option, while DIY tests require extra days for mailing and lab processing.
Helpful Tip
Buyers can ask their agent to schedule the Radon test at the same time as the home inspection. This keeps everything on track and avoids last-minute delays.
What Comes Next?
On the following page, we share our own experiences with DIY Radon testing, including what we learned and how we used both passive and active devices in our Tahoe home.
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