Kentucky's residential real estate disclosure law goes further than most states. KRS §324.360 requires sellers to make specific written disclosures about radon — including a mandated warning paragraph — plus disclosing any past testing, results, or installed mitigation systems. Combined with the Kentucky Board of Radon Safety (KBRS) contractor registration requirement under KRS §§ 309.430-309.454, Kentucky has one of the more structured radon transaction frameworks in the United States.
KRS §324.360: what the statute requires
Under KRS §324.360, the seller's residential real estate disclosure form must:
- Include the specific written warning that "radon is a naturally occurring radioactive gas that, when it has accumulated in a building in sufficient quantities, may present health risks, including lung cancer."
- Disclose whether radon testing has been performed at the property, and if so, the date and result.
- Disclose whether a radon mitigation system has been installed, and if so, the installation date, contractor, and any subsequent verification testing results.
The seller cannot legally withhold radon information they possess. Penalties for failing to disclose include potential rescission of the sale and damages.
KRS §§ 309.430-309.454: the contractor side
Kentucky regulates radon mitigation contractors through KRS §§ 309.430-309.454, administered by the Kentucky Board of Radon Safety (KBRS). Under these statutes, any contractor performing radon mitigation work in Kentucky must hold an active KBRS registration in addition to a national credential (NRPP or NRSB).
For sellers, this matters because mitigation work performed by an uncertified contractor may not satisfy disclosure requirements — and could expose the seller to disclosure claims if the buyer later discovers the work wasn't done by a properly-registered contractor. For buyers, asking for the contractor's KBRS registration number is the simplest verification step.
The three most common Kentucky transaction patterns
Pattern 1: Seller-paid mitigation before closing (~60%)
The most common outcome. Inspection radon test returns above 4 pCi/L → seller agrees to mitigate before closing → installation in 7-14 days → independent post-mitigation verification test confirms sub-4 pCi/L → closing proceeds on schedule. The buyer gets a verified-mitigated home; the seller maintains the agreed-upon sale price.
Pattern 2: Closing credit / escrow (~30%)
Seller credits the buyer at closing (typical $1,000-$3,000 depending on home size and Louisville Metro vs. other regions). Buyer arranges mitigation post-close. Faster path to closing but introduces some lender complications, especially with FHA/USDA financing.
Pattern 3: Buyer-paid (~10%)
Rare. Usually only in competitive multi-bid situations where the buyer accepts the seller's refusal to mitigate.
What about Inner Bluegrass / Louisville Metro homes?
Kentucky's geological radon (driven by Inner Bluegrass karst limestone — see Inner Bluegrass Karst Geology: Why Kentucky Has the Highest Radon East of the Mississippi) means homes in Louisville, Lexington, Frankfort, and Northern Kentucky markets routinely return elevated inspection results. Local agents in these markets treat radon contingencies as standard practice — sometimes recommending pre-listing testing to surface the issue before going under contract.
Typical Kentucky transaction timeline
- Day 0: Buyer's inspection radon test returns elevated.
- Day 1-2: Lead routed to NRPP + KBRS-registered partner contractor; quote received within 2 hours.
- Day 2-4: Buyer/seller negotiate cost responsibility.
- Day 4-7: Mitigation installed (4-8 hours on-site work).
- Day 8-11: 48-96 hour post-mitigation verification test under closed-house conditions.
- Day 11+: Verification report (sub-4 pCi/L) delivered for closing documentation.
This timeline fits most Kentucky inspection contingencies (10-14 days) with margin. For tighter contingencies, a brief extension is typically negotiated.
Typical Kentucky cost ranges
Use our Kentucky radon mitigation cost calculator for a precise estimate based on your city and home characteristics. General ranges:
- Active Sub-Slab Depressurization (ASD): $800-$2,500 (Louisville $1,000-$1,500 typical)
- Sub-Membrane (crawl space): $1,500-$3,500 (common in southern + western KY)
- Block-Wall Depressurization: $1,500-$4,500
One non-negotiable: independent post-mitigation testing
The post-mitigation verification test must be performed under AARST-ANSI standards (48-96 hour CRM under closed-house) — ideally by an independent measurement provider, not the installing contractor. This is what creates the lender-acceptable documentation chain.
For more on Kentucky's geological radon background, see Inner Bluegrass Karst Geology. For a specific case study, see Louisville's Highest Radon Readings.
Sources: KRS §324.360, KRS §§ 309.430-309.454, Greater Louisville Association of REALTORS guidance, Lexington-Bluegrass Association of Realtors transaction data.