Most buyers arrive knowing they need a home inspection. Fewer know that the inspection is a starting point rather than the whole picture, and that some of the most important tests are the ones you have to ask for.
Radon is the one that matters most in Indiana, and it is routinely skipped by buyers who have never heard of it. Here is what to know.
What radon is, briefly
Radon is a naturally occurring radioactive gas produced by the breakdown of uranium in soil and rock. It has no color, no smell, and no taste, which is precisely why it goes unnoticed.
It enters homes from the ground through foundation cracks, sump pits, crawl space floors, and gaps around pipes, and it accumulates in the lowest levels of a house. Basements are the usual concern, which matters here because most of our homes have one.
The EPA's radon resources explain the health basis and the recommended action levels, and the Indiana Department of Health is the state-level resource.
Why it matters here specifically
Indiana sits in a part of the country where higher radon readings are common. That is a function of geology, not of housing quality.
The critical thing to understand is that results are house by house. Not neighborhood by neighborhood, not subdivision by subdivision. Two homes on the same street, built by the same builder in the same year, can test very differently depending on soil conditions, foundation details, and how the house is ventilated.
Which means a neighbor's result tells you almost nothing about the house you are buying. You have to test the actual property.
It also means age is not a reliable predictor. Newer, tighter homes are not automatically safer, and in some cases better sealing works against you.
How the test works
The common approach during a transaction is a short-term test placed in the lowest livable level of the home for a set period, typically a couple of days, under closed-house conditions.
Closed-house conditions matter. Windows and exterior doors stay shut except for normal entry and exit, and that has to hold for a period before and during the test. A test run with the windows open is not a test, it is a waste of your inspection window.
Which brings up a practical point specific to buying a vacant home: if the house has been sitting empty with the heat off or the windows open, discuss timing with your tester. Conditions affect results.
Radon testing is usually not part of a standard home inspection. It is an add-on you request, often arranged through your inspector. Ask for it explicitly, and schedule it early in your inspection period, because the test takes days and you need the results while you still have contract protection. What a home inspection covers explains the base scope, and contingencies explained covers the window you are working inside.
If the result comes back high
Do not panic and do not walk away reflexively. This is a solvable problem with a known solution.
Mitigation systems are well established. The typical approach depressurizes the soil beneath the foundation and vents the gas above the roofline with a fan and piping, so it disperses outside rather than accumulating inside. Installation is generally straightforward for a qualified contractor.
In a transaction, this becomes a negotiation item like any other inspection finding. Buyers commonly ask the seller to install a system or provide a credit toward one. Sellers frequently agree, because the issue does not disappear if this buyer walks and it will simply surface again with the next one.
I go through how those conversations tend to run in negotiating repair requests.
After installation, retest to confirm the system is working. That step gets skipped and it should not.
One reassurance for sellers reading this: an installed system with documentation generally does not hurt resale. If anything it removes a question mark, because the alternative is an untested house.
The other tests worth considering
Which ones apply depends entirely on the property.
Well water quality and flow. If the home is on a private well, this is not optional. Bacteria and nitrates are the standard concerns, and nitrates matter in agricultural areas, which describes a lot of ground around here. Not included in a standard inspection.
Septic inspection. A separate specialist, not your general inspector. Locating the tank, opening it, and evaluating the drain field is its own job. Both of these are covered in buying a home with a well or septic system.
Mold and moisture. Worth pursuing where there is visible evidence, a musty smell, or a history of water in the basement. Frequently the more useful question is what is letting water in, because fixing the source matters more than treating the symptom.
Lead paint and asbestos. Considerations in older housing, and Greater Lafayette has a good deal of it. Federal disclosure requirements apply to lead-based paint in homes built before 1978. Buying an older home covers what else comes with that vintage, and historic homes and districts covers the character side.
Sewer line inspection. A camera scope of the lateral line, worth considering on older properties or where there are mature trees near the line. Not glamorous and occasionally the most valuable few dollars in the whole inspection.
Budgeting for it
These tests cost money on top of your inspection, and buyers on a tight budget are tempted to skip them.
My honest advice is to prioritize by the property rather than by the price list. A house on a private well outside the cities has a different test list than a subdivision home on municipal utilities. An older in-town home has different concerns than a five-year-old build.
Radon I would test on essentially any home here with a basement or slab, which is nearly all of them. It is inexpensive relative to what it tells you.
Fold these into your closing budget from the start so they are planned rather than resented. Closing costs for Indiana buyers covers the wider picture.
The point of all of it
None of this should make you nervous about buying here. Homes across Indiana have these considerations and people address them routinely.
The purpose of testing is not to find a reason to walk away. It is to know what you are buying, so that the decision you make is an informed one and so that anything requiring attention gets handled while you still have the ability to ask for it.
You can look up radon information for this region in a few minutes. What you cannot look up is which specific house has an issue, which local contractors do this work well, or whether the seller across the table is likely to address it. That is the local part, and it is the part that actually protects you.
If you are under contract or getting close and want help lining up the right tests, grab a time on my calendar. A real person reads every message. No pressure either way.