Most sellers in Fort Thomas assume Kentucky requires a radon test before they can list a hundred-year-old home. It doesn't. The state's disclosure law only requires you to report a test if one already happened. No prior test, no radon section to fill in beyond checking "unknown." That gap between what feels mandatory and what the law actually says is where a lot of Fort Thomas sales get complicated, usually in the final two weeks before closing.
What Kentucky Actually Requires
Kentucky Revised Statute 324.360 governs the Seller's Disclosure of Property Condition, the form every residential seller working with a licensed agent has to complete. The form asks whether the seller is aware of any radon testing and what the results were. It does not ask the seller to go get tested. As the Environmental Law Institute's summary of the statute makes clear, the obligation is to disclose known results, not to generate new ones.
The form itself carries language the Kentucky Real Estate Commission added in December 2019, describing radon as a naturally occurring gas that can present health risks at elevated levels. It's a warning, not a requirement to act on it before selling.
That distinction matters because it means two sellers on the same Fort Thomas street can have completely different disclosure obligations depending on whether either of them ever ordered a $150 test kit. One seller who tested in 2019 and got a high reading has to disclose it forever, even after installing mitigation. The neighbor who never tested has nothing to write down, even if their basement radon level is identical.
Why the Housing Stock Makes This Relevant Here
Fort Thomas earned its old nickname, the "City of Beautiful Homes," honestly. According to the Advisory Council on Historic Preservation, more than 160 residences in the city are at least a century old. The fort itself was built between 1890 and 1901, served as a mobilization point during the Spanish-American War, and later operated as a military hospital. A 102-foot stone water tower still stands in Tower Park as a memorial to those losses. When the Army post was deactivated, the city acquired a number of the officers' quarters, listed them on the National Register of Historic Places, and resold them to private owners under agreements that protect their historic character to this day.
Homes from that era, most built between 1890 and 1935 in Arts and Crafts foursquare, bungalow, Colonial Revival, and Tudor Revival styles, tend to sit on foundations that predate modern soil-gas barriers or sub-slab vapor control. That doesn't make radon a certainty. Campbell County carries an EPA-assigned Radon Zone 2 designation, meaning predicted average indoor screening levels fall between 2 and 4 picocuries per liter, moderate rather than the highest classification. But moderate still means plenty of individual basements test above the EPA's 4 pCi/L action threshold, and older foundations with more entry points for soil gas are the homes most likely to land there.
The Math That Changes the Negotiation
Here's where the legal gap turns into a strategic choice. A seller who tests before listing controls the timeline. A seller who waits finds out from the buyer's inspector, usually somewhere in the due diligence period, with a closing date already on the calendar and a buyer already emotionally invested in the house.
| Step | Typical Cost | Who Usually Handles It |
|---|---|---|
| Full home inspection | $325–$525 statewide average; Fort Thomas condos and homes under 1,000 square feet often run closer to $200–$350 | Buyer, during due diligence |
| Short-term radon test | $150–$250 | Either party, depending on when it happens |
| Radon mitigation system | $800–$2,000, most commonly $1,000–$1,500 for a standard basement | Negotiated, often as a seller credit |
If a test surfaces an elevated reading before the home is listed, the seller has options: install mitigation on their own schedule, price it into the listing, or disclose it upfront and let buyers factor it into their offer. If the same reading turns up after an accepted offer, the seller is usually negotiating from a weaker position, often absorbing a credit that's larger than the mitigation itself would have cost, simply because the deal's momentum makes both sides want to close fast.
A reasonable pre-listing sequence looks like this:
- Order a short-term test as part of, or ahead of, your pre-listing inspection.
- Compare the result to the EPA's 4 pCi/L action threshold, not just to "normal for the area."
- If elevated, get a mitigation quote before you set your list price, not after an offer arrives.
- Put the result, whatever it is, on the disclosure form. A documented result with mitigation already installed reads very differently to a buyer than a blank box marked unknown.
What Else the Form Doesn't Let You Skip
Radon is the one item on the Kentucky disclosure form where testing itself is optional. Almost nothing else on it works that way. Once an inspection happens, known defects in the roof, foundation, plumbing, and electrical systems have to be disclosed if they're material to value. For a Fort Thomas home built before 1978, federal law adds a lead-based paint disclosure requirement on top of the state form, a near-certainty given how much of the city's housing stock predates that year.
The practical effect is that a pre-listing inspection doesn't just help with pricing. It also starts the clock on what you're legally obligated to say. Sellers who inspect early and disclose fully tend to close faster, because there are fewer surprises to renegotiate around in week three.
Frequently Asked Questions
Do I have to test for radon before selling my Fort Thomas home? No. Kentucky law requires you to disclose test results if testing occurred, but it doesn't require you to test in the first place. Whether to test is a strategic decision, not a legal one.
What if a previous owner tested years ago and never told me? Your disclosure obligation runs to what you know. If you have no record of a prior test and no reason to believe one exists, you can answer honestly that you're unaware of testing. If you find old paperwork later, disclose it before closing.
How long does mitigation take if a test comes back high mid-contract? Most sub-slab systems install in a single day, with a follow-up test conducted shortly after to confirm the reading dropped. The scheduling challenge isn't the install itself, it's fitting it into a contract timeline that's already moving toward a closing date.
Get Ahead of It Before It's a Negotiation
If you're preparing to list a Fort Thomas home built before 1935, the smartest move is deciding what you want to know before a buyer's inspector decides for you. Dwell Well Group coordinates pre-listing inspections and vetted radon testing through its VIP Concierge vendor network, so results land on your timeline instead of a buyer's. Request a Dwell Well Consultation and we'll walk through what your specific home's age and lot are likely to surface, before it ever reaches a contract.