Buying a House
Radon Testing When Buying a House in Alabama: The Complete Timeline
The short version: Alabama doesn't require a radon test buying a house — but you can add one to your home inspection, and if you start it on day one or two of your 10-day inspection window, you'll have the number back with real time left to negotiate or close. Below is the day-by-day walkthrough in plain English: who orders it, who pays, how long it takes, and what the result means for your deal.
10days
typical Alabama inspection window
48hrs
minimum radon test time (ANSI/AARST MAH-2019)
$295
flat, buyer pays, no agent fees
The Straight Answer
Is a radon test required when buying a home in Alabama?
No. No federal law requires one on a home purchase, and Alabama doesn't have a state law requiring one either. Alabama also doesn't put radon on its standard seller's disclosure — a fact buyers, sellers, and agents all seem to discover around day three of the contract. It's an optional test that the buyer adds, the buyer pays for, and the buyer gets the report on.
Here's the twist: the Alabama Department of Public Health does recommend that every home be tested, and that a real-estate test be run by a certified pro on a continuous monitor for at least 48 hours. Both Jefferson and Shelby County are on ADPH's list of Alabama's 15 highest-potential radon counties. So "not required by law" and "smart to do anyway" are both true.
“In Alabama, 15 counties have been identified as having the highest potential for elevated radon levels. They are Calhoun, Clay, Cleburne, Colbert, Coosa, Franklin, Jackson, Jefferson, Lauderdale, Lawrence, Limestone, Madison, Morgan, Shelby and Talladega.”
The Timeline
The 10-day inspection window, day by day.
A standard Alabama inspection window is 10 days. Radon takes 48 hours to measure, plus a little time to schedule and get the lab report back. Here's what the days look like on a run that finishes with room to spare:
Day 0
Offer accepted
The inspection contingency clock — the days after your offer when you can still inspect and back out or renegotiate — starts the day the contract is signed. On a standard Alabama contract, that clock is usually 10 days. Every day from here to that deadline is a day of runway.
Days 1–2
Book the home inspection and add radon
You (or your agent) book the general home inspection and add a radon test. Radon is a separate service — a regular home inspector won't measure it for you unless they're also certified to run a radon monitor for the full time it takes.
Days 2–4
The monitor goes in the house
We place a sealed continuous radon monitor on the lowest living level of the home, with the windows and outside doors kept closed. The real-estate testing standard (ANSI/AARST MAH-2019) requires the monitor to record for at least 48 hours.
Days 4–5
Pickup and your lab report
After the 48-hour run, we pick up the monitor and pull the hourly data. The certified lab report usually lands in your inbox about an hour later. We send it to whoever you want — you, your agent, your closing attorney.
Days 5–10
Time left to negotiate or close
You get the number back with real days still on the clock. Under 2.0 pCi/L (picocuries per liter, the standard radon unit), most buyers move on. Between 2 and 4, you can retest or ask for a credit. At 4.0 or higher, you have time to negotiate mitigation (installing a fan-and-vent system that pulls the radon out from under the slab) before the deadline — not after.
Wait until day six to call and the math turns against you. A scheduling delay, a slow lab, or a rescheduled pickup can push the report past your deadline — and at that point the inspection window isn't protecting you anymore, it's just a clock you can't beat. The fix isn't hoping it works out. It's starting the test on day one or two. The full timing walkthrough is on ourhow long a radon test takespage.
Who Does What
Who orders the test, who pays, and who gets the report.
On a normal Alabama home purchase, the buyer orders the radon test (usually through their agent) and pays for it at the time of service. The seller doesn't have to test, pay, or share old results — unless you ask, or unless they're already sitting on a bad result you couldn't discover on your own (that's the caveat emptor exception below).
The report goes to you. In practice we email the certified PDF to whoever you tell us to: you, your agent, often your closing attorney. We never send it to the seller or the listing agent first — that would break the chain of custody (the paper trail that proves nobody tampered with the monitor) that makes the number usable in a negotiation.
The price is $295 flat. You pay us. We pay no fees to any agent on either side. RESPA — the federal law that bans paying kickbacks for referrals on any home purchase financed with a mortgage — makes referral payments a legal problem, and a tester who pays for referrals isn't really independent anyway. Thefor-agents page covers the scheduling side; theAlabama radon disclosure pagecovers the legal side.
Alabama Law, In Plain English
What Alabama's caveat emptor rule actually means for radon.
Alabama is a caveat emptor state on used homes — that's Latin for "buyer beware," and in plain terms it means Alabama sellers generally don't have to volunteer problems with the house. Alabama also doesn't require a radon disclosure form. That's the headline. The footnote is what matters when you're really in a deal.
The Alabama Supreme Court, in Fennell Realty Co. v. Martin, 529 So. 2d 1003 (Ala. 1988), laid out the exceptions to caveat emptor. The one that matters for radon is the health-or-safety exception: if the seller knows about a serious defect that affects health or safety, and knows the buyer wouldn't easily catch it, "buyer beware" doesn't cover it. Radon is invisible, odorless, and only shows up on a meter. So once a seller is holding a bad radon result, they can't hide behind caveat emptor anymore.
Two other Fennell exceptions are worth knowing about: (1) if a fiduciary relationship exists between the parties (the seller has a special duty of trust), and (2) if the buyer asks a direct question — then the seller has to answer truthfully and completely. So if you ask, in writing, whether the home has ever been tested for radon and the answer is yes with a high result, that answer has to be told. This is why running your own fresh test — on a chain of custody you control — is the cleanest way to know the number.
This page explains Alabama law in plain language. It's not legal advice for your specific deal. For a real transaction, talk to your own licensed Alabama real-estate agent or attorney.
Reading the Report
What the number means for the negotiation.
The report comes down to one number: the average radon level across the 48 hours, measured in pCi/L (picocuries per liter of air — the standard radon unit), plus the hourly readings that add up to it. The EPA's action level — the number the federal government says you should fix — is 4.0 pCi/L. Both the EPA and Alabama Public Health also say to think about fixing homes reading between 2 and 4. The World Health Organization sets its reference level at 2.7. How your number lands is how the negotiation moves.
- Under 2.0 pCi/L — about where the average U.S. home reads (1.3). Most buyers just move on.
- Between 2.0 and 4.0 pCi/L — the honest gray zone. A retest, a longer-term test, or asking for a mitigation credit are all reasonable moves. Our page ona 2 to 4 pCi/L result walks you through the call.
- 4.0 pCi/L or higher — EPA's action level. Time to talk about mitigation before your deadline. Birmingham metro systems typically run $1,500–$2,500 installed and go in in a day. Seewhat happens if the test comes back high.
CDC tracking data (2008–2017) puts about 1 in 9 reported tests in Jefferson County (10.7% of ~630) and about 1 in 9 in Shelby County (11.3% of ~283) at or above 4.0. St. Clair County comes in closer to 1 in 7 (14.0% of ~70). Coming back high isn't a rare outcome here.
What Smart Buyers Do
What smart Birmingham buyers actually do.
Test on day one or two. Use a certified continuous monitor to the real-estate standard, not a hardware-store charcoal kit dropped off by the home inspector. Keep the report on your side of the deal. Under 2.0? Move on. Between 2 and 4? Decide with the report and your days-left in front of you. 4.0 or higher? Negotiate mitigation while you still have a contingency to protect you — not after it expires. That's the whole reason to start early.
To see what the test itself looks like step by step, readhow radon testing works. If the house already has a mitigation system, our page onbuying a house with a radon mitigation systemcovers what to check. If you're still weighing whether to test at all, seeis radon testing really necessary.
Book the test on day one — $295 flat, report back inside your inspection window.
FAQ
Frequently Asked Questions
Is a radon test required when buying a home in Alabama?
No — no Alabama law requires a radon test to buy a house, and Alabama doesn't license radon pros either (the credentials to look for are NRPP or AARST). It's a buyer's call, added to your home inspection. That said, the Alabama Department of Public Health (ADPH) does recommend testing every home, and it names Jefferson and Shelby among Alabama's 15 highest-potential radon counties.
Who pays for the radon test — buyer or seller?
On a normal Alabama home purchase, the buyer orders and pays for it as part of the home inspection. The seller doesn't have to test, share old results, or say anything about radon unless you ask (or unless they're already holding a bad result you couldn't find out about on your own — see the disclosure page). Our price is $295 flat, paid by you, with no fee to the agent on either side.
How long does a radon test take during a home inspection?
The real-estate testing standard (ANSI/AARST MAH-2019) requires the monitor to run for at least 48 hours, with the house sealed up for 12 hours before we start. Once we pick up the monitor, the certified lab report usually comes back about an hour later. From your first call to the report in hand: about three days.
Can the home inspector do the radon test at the same time?
Only if the inspector is separately certified for radon and runs a proper continuous monitor for the full 48 hours. A cheap charcoal kit the inspector drops off isn't a result a lender, a seller, or a closing attorney can lean on. If it isn't a certified device running for 48 hours with the house closed up, it's not the report you need.
What happens if the test comes back above 4.0 pCi/L?
It almost never kills the deal. A radon mitigation system in the Birmingham metro (a sub-slab fan and vent that pulls the gas out from under the house) typically runs $1,500 to $2,500 installed and goes in in a day. The conversation usually lands one of three ways: the seller installs a system and shows you a post-fix test, the seller credits or splits the cost at closing, or the price comes down and you install after closing. Details are on our page on what happens if the radon test comes back high before closing.