Buying or Selling

Buying or selling a home with radon

Whether you’re buying or selling, we fix the radon and give you the paperwork for the file.

What Matters

What to do next

We plan the system for your home, whether it has a basement, a crawl space, a slab, or a mix.

If closing is soon

Call as early as you can. You’ll have more choices, and we’ll tell you honestly what we can get done before your date.

If you’re not sure what to do

Call Bill. He’ll tell you what a radon system usually involves and what to do next. No test yet? He can point you to a free or $8 county kit.

Are you the agent? Use the buyer-side realtor page or the listing-side realtor page.

Radon Mitigation for Sellers

If you’re selling

High radon often shows up when the buyer’s inspector tests your home. Send us the result and your closing date early. Bill will look at your home, give you a price, and tell you what fits your closing date. If you go ahead, radon comes off the repair list once the system is in.

If the deal falls through, the system and the paperwork stay with the home for the next buyer, who may still test it.

Your next home

Get it tested too. If it tests high, we can give you a price to use with those sellers. Bill can point you to free or low-cost test options.

Radon Mitigation for Buyers

If you’re buying

Call Bill with the result during your inspection window. He’ll give you a price on the home you’re buying and go over the layout, the warranty, and the timing.

Ask your agent or attorney whether to have the system put in before closing or to take a credit from the seller. We give you the plan and the price. They help you with the contract.

What you get

Most systems go in on one visit. We cover the floors, put the system in, clean up, and show you how it works before we leave.

You get the system paperwork and the written warranty for your records and the sale file.

No trip charge. If the fan fails in its first five years, we replace it for free, and the new fan gets its own five-year warranty.

What paperwork should you keep?

Keep the system paperwork, the warranty, any photos or notes we give you, and your test result after the install. The Illinois IEMA-OHS real estate radon materials are the state’s official guide to testing during a sale. Your records help the next owner, their agent, and anyone who works on the system later.

What happens after the install?

Bill stops by during the install, but he isn’t there the whole time. Test the home again after the waiting period, so the buyer, seller, or agent has a new result for the file.

To see how install day goes, read what to expect during a radon mitigation install. For warranty help after closing, see customer care.

Helpful official radon resources

Last reviewed by American Radon Systems: July 2026

FAQ

Buying and selling questions

High radon comes up in home inspections all the time. These answers are not legal advice, so talk with your agent or attorney about the contract.

What is the EPA action level for radon?

The U.S. EPA action level is 4.0 pCi/L. At or above that, EPA recommends fixing the home. EPA also suggests considering action between 2.0 and 4.0 pCi/L. For scale, EPA puts the average indoor level in the United States at about 1.3 pCi/L and outdoor air at about 0.4 pCi/L; there is no safe level, only lower and higher. American Radon Systems follows that guidance without scare tactics. Your own test result is the number that matters for your home.

My home tested high for radon. What do I do next?

Stay calm. Elevated radon is common and fixable. Note the number, where the test was placed, and any closing date. Then call Bill at (815) 370-9682 (that is his cell), or send your info on the contact form. You do not need to know what system you need. Bill looks at the home, explains the next step, and prices before work begins.

How long does a typical radon mitigation install take?

Most residential installs are completed in a single visit, often a few hours once the plan is set. Bill looks at the home first so materials and routing are right. Real estate closings get scheduled around the calendar when you tell us the date early.

I am buying a house that tested high for radon. What do I do next?

Call Bill with the inspection result, property address, and inspection deadline if you have one. He can walk through the number and quote the home under contract. That gives you a real number for the conversation with your agent and attorney. Decisions about credits or concessions belong with them, and a firm quote makes that conversation easier.

What should a seller do if the buyer’s radon test comes back high?

Call early. Bill can look at the home, give a real quote, and help you understand the schedule. If you decide to install, the radon issue gets handled, documented, and removed as an open repair item instead of sitting as a negotiation problem near closing. Talk with your agent or attorney about the contract side.

What do most realtors recommend when a seller’s home tests high?

Most agents want a calm plan: state-licensed mitigation, clear timing, and paperwork that holds up in the file. Some deals use a seller-paid install and some use a credit. The right path depends on the contract and the parties. We are not giving legal advice. We give a realistic schedule, a clean system, and documentation agents can use.

What do most realtors recommend when a buyer’s inspection finds radon?

Buyer’s agents often want the buyer to understand the number, get a real quote for that house, and decide whether a credit, seller-paid install, or post-closing install fits the deal. Quality, routing, and warranty matter because the buyer is the one who will own the system. Bill can quote the property and work with the agent on timing.

Who usually pays for radon mitigation in a home sale?

It is negotiable. Sometimes the seller pays for install before closing. Sometimes the buyer receives a credit or concession and hires the mitigator. Local custom and the specific contract drive it. We price the work the same either way and focus on a system that is done right.

Can radon delay a closing, and how fast can you install?

It can if nobody calls until the last minute. Most of our installs are one visit once the plan is set. Tell us the closing date early. We will say what is realistic. Documentation is ready for the file when the job is complete.

What if the home already has a radon system?

Have it checked. We can inspect the visible parts, fan, and manometer and say honestly whether it needs repair, fan replacement, or nothing. A working system with documentation is usually a plus at resale, not a problem. A future buyer may still test the home.

Should I walk away from a house with high radon?

Elevated radon is common and can be addressed. It is not automatically a reason to abandon a good home. Get a mitigation plan and price during the inspection window, then decide with your agent using the home details and transaction terms.

Why does my newer home have a radon pipe but no fan?

That is usually a passive radon system: rough-in piping that Illinois has required in new residential construction since June 1, 2013, under the Radon Resistant Construction Act. It is not the same as a completed active system. If a test is elevated, activation adds the right fan and finishes the system so it pulls correctly. Bill checks whether the existing pipe is usable first.

Does the warranty transfer to the next owner if I sell?

Every install comes with written documentation from a state licensed mitigator, which is what a buyer, their inspector, and their agent will want to see. Warranty details, including transferability, are spelled out in the customer packet you receive after installation, so keep that packet with your home paperwork.

Does Illinois require a radon test before selling a home?

No. The Illinois Radon Awareness Act does not require a seller to test or to mitigate. It requires the seller to give the buyer the IEMA-OHS pamphlet Radon Testing Guidelines for Real Estate Transactions and a Disclosure of Information on Radon Hazards form that states what the seller actually knows, including any earlier elevated results and whether the home was mitigated. Because that disclosure only covers what the seller knows, buyers usually test during the inspection period.

Should I test for radon before listing my home?

EPA recommends testing before you put the home on the market and, if needed, fixing the level first, because you have more time to handle it than you will in the middle of a contract. Save the result and the mitigation paperwork. A documented system from a state licensed mitigator is a selling point rather than a surprise at inspection.

Questions about your sale?

Call Bill or fill out the form.

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