“The radon test failed during inspection.” What now?
First, nothing about this is unusual here. Delaware County is EPA Zone 1 and the average Muncie home tests right at the action level, so a high radon result on an inspection is a routine outcome, not a red flag about the house or the seller.
Second, the practical facts, in the order people ask for them:
- It is fixable. A mitigation system is standard, well-understood work with a known outcome.
- It costs $1,200 to $2,000 for a typical single-family home in this market.
- The install is usually one day, and the verification test after it runs 48 hours.
- Who pays is negotiable. See the FAQ below; all four common arrangements are normal.
- It does not have to blow up your timeline. Even when the calendar is tight, a credit at closing decouples the money from the schedule.
Working against a closing date
Day 1: get the actual document
Not the summary line in the inspection report, the radon report itself. You want the measured value, the test method, the start and end times, and whether closed-house conditions held. A short-term charcoal result near the action level and a 48-hour continuous monitor result are not equally decisive.
Day 1 to 2: get a quote in writing
You need a real number before you can negotiate about it. A written quote turns "the radon failed" into a specific dollar figure that both agents can work with, which is what unsticks the conversation.
Day 2 to 5: decide the money question
Seller pays and installs, seller credits at closing, split, or buyer absorbs. This is an agent conversation, not a contractor one. Deciding it early is what protects the date.
Install, then verify
The system itself is typically a one-day job. The post-mitigation test that documents the new level runs 48 hours. Schedule the verification test as part of the job, not as an afterthought, because that document is what the file needs.
How radon contingencies work in an Indiana purchase agreement
Radon usually enters an Indiana transaction through the inspection contingency rather than as its own clause. The buyer orders inspections within an agreed window, radon testing is commonly one of them, and the results feed into the buyer’s written response requesting repairs, a credit, or a price adjustment.
The mechanics that matter for your timeline:
- The inspection period is the real deadline. A radon test needs 48 hours minimum under closed-house conditions, plus lab turnaround if it is a charcoal test. Ordering it on day six of a seven-day window is how deals get extended.
- Closed-house conditions have to actually hold. The house needs to be sealed for 12 hours before the test starts and throughout. A vacant house with an agent doing showings, or a seller airing the place out, invalidates the test. This is the most common cause of a disputed radon result.
- Retest rights are worth negotiating in. If the parties disagree about a borderline number, the cleanest resolution is a second test by a professional using a continuous monitor, agreed to in advance.
- The remedy is negotiable, and so is the standard. “Seller shall mitigate to below 4.0 pCi/L, verified by post-mitigation testing” is a materially different obligation from “seller shall install a radon mitigation system.” Specify the outcome, not just the equipment.
Your agent and your attorney own the contract language. What we can tell you is which technical details change the answer.
Selling? Test before you list
Pre-listing radon testing is the highest-leverage thing a Delaware County seller can do about this, for reasons that have nothing to do with radon and everything to do with negotiating position.
Discovered during inspection, a high radon result arrives at the worst possible moment: the buyer is already emotionally committed but also newly wary, the clock is running, and every request now competes with every other inspection item. You are negotiating under time pressure about a number you just learned.
Found before listing, the same result is just a project. You get quotes on your own schedule, choose your own contractor, and either fix it or price it in. Then the listing says the house has a mitigation system with a documented post-install result, and radon is removed from the negotiation before it starts.
The cost asymmetry is the argument. A test is a small expense. A mid-transaction radon negotiation, where the buyer is now anchored on the worst-case cost and has leverage from the calendar, routinely costs more than the system.
For agents
If you write in Delaware County, radon comes up constantly, and what you need from a radon contractor is boring reliability:
- A quote fast enough to matter, because the inspection response window is where a deal lives or dies.
- Test results in a form the file can hold, with method, times, and conditions documented.
- Straight answers about scheduling before commitments get made on either side.
- Someone who will tell your client a 2.4 does not need a system, because the client who was not upsold is the client who refers you.
Call the number at the top of this page and say you are an agent with a transaction. We will tell you what is realistic on your timeline before anyone commits to anything.
If you have not tested yet
Whether you are buying, selling, or just got an accepted offer, the radon testing page covers test types, what makes a result defensible, and why the method matters more in a transaction than it does for your own curiosity. If you already have a number and want to know what fixing it involves, that is the radon mitigation page.
Frequently asked questions
Who pays for radon mitigation, the buyer or the seller?
There is no rule. It is a negotiated repair item like anything else that comes out of an inspection, and in practice it usually lands one of four ways: the seller pays and has the work done before closing, the seller credits the buyer at closing and the buyer schedules it afterward, the two split it, or the buyer absorbs it in exchange for something else in the deal.
The credit-at-closing option is worth knowing about, because it removes the schedule risk entirely. Nobody is waiting on a contractor to finish before the closing table.
Can I still close on time if the radon test failed?
Usually, yes. A mitigation system on a typical single-family home is a one-day install once it is scheduled, and the post-mitigation test that verifies it can be a 48-hour continuous monitor. The realistic constraint is contractor availability, not the work itself.
If the calendar is genuinely too tight, the credit-at-closing route separates the money from the schedule so the deal is not waiting on a fan to arrive.
Does a radon mitigation system hurt resale value?
The evidence points the other way. A documented system with a post-install test result is a resolved issue, and it removes radon from the next buyer's negotiation entirely. A house with no system and no test is an open question that the next inspection will reopen.
What buyers react badly to is not the presence of a system, it is a system nobody can produce paperwork for. Keep the post-mitigation test result with the house documents.
Does Indiana require radon testing when selling a house?
Indiana does not mandate a radon test as a condition of sale. What drives testing in practice is the purchase agreement and the lender: buyers routinely request a radon test as part of inspection, and some loan programs and relocation companies require one.
Disclosure is a separate question from testing. If you know of a prior high result or an existing system, that is material information about the property. Ask your agent how Indiana's disclosure form treats what you specifically know, because the answer depends on the facts.