How to Negotiate Radon Mitigation When Buying a Home

The Radon Clause in Your Contract

Before negotiating, understand what your contract says. Most well-written buyer contracts include:

• Radon testing contingency: The buyer has the right to test during the inspection period
• Threshold: Contracts may specify an action level (usually 4.0 pCi/L, sometimes 2.0 pCi/L)
• Remedies: What options the buyer has if results exceed the threshold (credit, seller-remediate, or exit)

If your contract doesn't have a radon clause, your ability to negotiate is based on what the seller agrees to — not a contractual right. Real estate attorneys in high-radon states can add this language; worth doing before you sign.

Your Three Negotiation Options

Option 1: Seller pays for and completes mitigation before closing

Best outcome for buyers. The system is installed, a post-mitigation test is run (30 days), and you see results before you close. You're not buying a problem — you're buying a solved problem.

*Downside:* Takes time. You'll need 4–6 weeks from discovery to confirmed post-mitigation results. This may require extending the closing date.

Option 2: Buyer credit at closing

Seller gives you $1,500–$2,500 credit; you arrange mitigation after closing. Simpler and faster, but:

• You're managing the project with money that's already been spent
• If the first system attempt doesn't achieve adequate levels, you bear the additional cost
• You can't verify results before closing

*Best use case:* Time pressure where closing extension isn't possible, or when you want to choose your own contractor.

Option 3: Price reduction

Similar to a credit but reflected in the purchase price. Useful if financing rules prevent credits. Same caution as credits — you're carrying the risk of an inadequate first installation.

Getting the Numbers Right

Before submitting your response to the inspection report:

1. Get 2–3 quotes from NRPP-certified contractors — email or call them with the home address, foundation type, and square footage. Most give quick ballpark estimates.
2. Present quotes with your request — don't name a number from thin air. "Three contractors quoted $1,200–$1,900; we're requesting a $1,800 credit" is far more persuasive than "we want $2,000."
3. Account for post-mitigation testing — the quote should include a post-mitigation test. If not, add $25–$50 to your credit request.

What to Avoid

Overplaying the health angle in negotiation: Sellers know radon is fixable. Framing it as a health crisis when it's an engineering problem makes the negotiation adversarial unnecessarily.

Accepting a credit without specifying the threshold: If you take a credit and the first system doesn't achieve below 4.0 pCi/L, you need more money. Specify in the agreement that the credit covers achieving a specific post-mitigation level.

Skipping post-mitigation verification: Whether the seller remediates or you take a credit, always run a 30-day post-mitigation test before considering this resolved.

Find a certified mitigator in your state → | Does radon affect home value? →