Real Estate Radon Inspection St. Louis | South County Radon
📞 (314) 334-5417
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Real Estate Radon Testing

Radon Inspections for Home Buyers & Sellers in South County

Fast turnaround radon testing built around real estate transaction timelines. Serving Webster Groves, Kirkwood, Crestwood, Affton, and Sunset Hills. Results when you need them.

📞 Call (314) 334-5417 See the Timeline
✓ Fits Your Inspection Contingency
✓ Results in 48–72 Hours
✓ Certified Written Report
Who We Serve

Radon Testing for Every Side of the Transaction

Whether you’re buying, selling, or representing a client — we fit your timeline and deliver results you can act on.

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For Home Buyers

  • Test during your inspection contingency period — no closing delays
  • Get a certified written report your lender and agent can use
  • If levels are high, negotiate a mitigation credit before closing
  • Know exactly what you’re buying before you sign
  • Most tests scheduled within 24 hours of your call
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For Home Sellers

  • Test before listing — eliminate a common deal-killer
  • Mitigate proactively and market your home as radon-safe
  • Avoid surprise results that delay or kill your closing
  • A clean radon report can be a genuine selling point
  • Documented low levels build buyer confidence
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For Real Estate Agents

  • We work around your transaction timeline — not ours
  • Fast scheduling and reliable communication
  • Professional written reports your clients can understand
  • Referral relationship available for high-volume agents
  • We make you look good — every time
How It Fits Your Deal

The Real Estate Radon Timeline

Here’s how a radon test fits into a typical real estate transaction in South County — from offer to close.

1
Day 0

Offer Accepted

The inspection contingency period begins. This is when radon testing should be ordered — most inspection windows are 7–10 days.

2
Day 1

Call Us — Test Scheduled

Call (314) 334-5417 and we’ll schedule a licensed tester for the next available day — usually within 24 hours. We coordinate directly with the seller’s agent for access.

3
Day 2

Test Device Placed

The tester visits the home and places the test device in the lowest livable area. The home enters closed-house conditions for 48–72 hours.

4
Day 4–5

Device Retrieved & Lab Results

The tester retrieves the device and submits it to the lab. Written results are typically available within 24 hours of retrieval.

5
Day 5–6

Written Report Delivered

You receive a certified written report with the radon level and EPA classification. This is the document your agent and lender need.

6
Day 6–10

Negotiate or Proceed

If levels are low — proceed with confidence. If levels are high — negotiate a mitigation credit or seller-paid fix before closing. Either way, you have the information you need.

What If It’s High?

A High Radon Result Doesn’t Kill the Deal

High radon is fixable. Here’s how buyers and sellers typically handle it when results come back above 4 pCi/L.

🏡 If You’re the Buyer

You have several options. You can request the seller install a mitigation system before closing. You can negotiate a credit at closing (typically $800–$1,500) to cover the cost yourself. Or in rare cases, you can walk away under the inspection contingency.

Most deals with high radon results still close — radon is a known, fixable problem. It’s not a deal-killer; it’s a negotiation point.

🔑 If You’re the Seller

If your home tests high during a buyer’s inspection, you have two main options: install mitigation before closing (a licensed contractor can often complete this within a week), or offer a credit to the buyer.

The best strategy is to test before you list. That way you control the narrative and can price accordingly — or mitigate before the first showing.

Real Estate Professionals

Why South County Agents Work With Us

We understand that in real estate, timing and reliability are everything. Here’s what we offer agents who refer clients to us.

Transaction Timeline Friendly

We schedule within 24 hours and deliver written results in 4–5 days total. We’ve never missed a contingency deadline for an agent who called us on Day 1.

Direct Coordination

We coordinate access directly with listing agents so you don’t have to play middleman. One call to us and it’s handled.

Professional Reports

Our written reports are clear, certified, and formatted for real estate transactions. No confusing technical jargon — just the number and what it means.

Referral Partnership

High-volume agents in South County can set up a preferred referral relationship with us. Call to discuss what that looks like for your business.

Common Questions

Real Estate Radon FAQs

Is radon testing required to buy or sell a home in Missouri?
Radon testing is not legally required in Missouri for real estate transactions, but it is strongly recommended and increasingly expected by buyers. Many lenders now require it, and most experienced agents include it as a standard part of the inspection process.
How fast can you get results for a real estate transaction?
From the day we place the device, you can expect written results in 4–5 days. If you call us on Day 1 of your inspection period, you’ll have results well within a standard 7–10 day contingency window.
Does the seller need to be home during the test?
No. We coordinate access with the listing agent. The home just needs to be in closed-house conditions (windows and exterior doors shut) for the duration of the test period.
What if the test result is high — do I have to walk away?
Almost never. High radon is fixable with a mitigation system costing $800–$1,500. Most transactions with high radon results close successfully after a mitigation credit or seller-installed system. It’s a negotiation point, not a deal-killer.
Can a seller manipulate the test results?
Attempting to tamper with a radon test (opening windows, placing the device in a different location) is detectable and considered fraud. Licensed testers use tamper-indicating devices and document placement. Buyers can also request to be present when the device is placed and retrieved.
Should I get a radon test even if the seller says they already tested?
Yes — especially if the seller’s test is more than 2 years old, was done using a DIY kit, or you don’t have documentation. A fresh, certified test by a licensed professional is the only way to know the current radon level with confidence.

Need a Radon Test for Your Transaction?

Call today — most tests scheduled within 24 hours. Results in 4–5 days. Free quote.

📞 Call (314) 334-5417
Serving Webster Groves, Kirkwood, Crestwood & South County, MO
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