You Cannot Smell It.
You Can Measure It.
2,000+ 5-Star Reviews
We place a professional continuous radon monitor at the lowest liveable level of the property and leave it running for at least 48 hours. It logs the radon concentration hour by hour, along with temperature, humidity and any disturbance. When the test ends you get the result straight away — there is no laboratory in the loop.
Carried out to IAC2 protocols:
The things that catch people out. Tap one to see what it means.
A continuous radon monitor reads the air on site and logs it hour by hour. When the 48 hours are up the result exists immediately — there is nothing to post to a laboratory and nothing to wait for. That matters most when a test sits on a purchase deadline.
We test. We do not install radon mitigation systems and we do not sell you one, which means we have no reason to hand you a high number. If a result comes back at or above the action level you appoint a licensed mitigation contractor, and we can retest afterwards to confirm the system works.
DIY canisters are cheap and slow, and they average everything into one figure with no record of whether a window was open. We do not offer them. Everything we do is short-term testing on professional equipment.
Radon testing can be added to a home buyer inspection or a commercial building inspection for an additional fee and set up during the same visit. It is not part of a standard inspection.
Where you are already thinking about air quality, mold inspection and testing is the other half of the question — those samples do go to a certified laboratory. And a damp basement can have several causes — the buried sewer line is the one a visual inspection cannot check, so a sewer scope inspection rules it in or out.
See a sample radon reportHow it gets in
Radon is a naturally occurring radioactive gas with no color, no smell and no taste. The EPA lists it as the second-leading cause of lung cancer in the United States, and the only way to know what a building holds is to measure it.
Radon forms as uranium decays in soil and rock. Air pressure inside a building is usually lower than the soil around it, so the ground effectively pushes gas upward into the structure. This is the source in the overwhelming majority of homes.
Foundation cracks, construction joints, sump pits, crawlspace floors and the gaps where pipes and wiring pass through all give it a way in. Once inside it is trapped, and it accumulates.
Radon dissolved in groundwater is released into the air during ordinary use — showering, running taps, cooking. It is a smaller contributor than soil gas, but it is a real one on a private well.
New or old, basement or slab, tightly sealed or draughty — construction type does not predict the result. A brand-new house next door to a low one can read high. The only way to know is to measure the building you are actually in.
In two minutes
Where it comes from, why it matters in Michigan, and what a test actually tells you.
Michigan specifically
The American Association of Radon Scientists and Technologists publishes a radon report card for every state. Michigan’s makes three things plain.
of Michigan buildings tested before mitigation came back at or above the EPA action level of 4.0 pCi/L. Another 27% measured between 2 and 4 — so more than half read above 2 pCi/L.
radon-induced lung cancer cases a year in Michigan, out of 7,984 lung cancer cases in total. Radon is the leading cause among people who have never smoked.
Michigan requires no credential to test a home for radon, and has no radon standards in effect. Anyone may sell you a radon test. That is precisely why the certification behind it is worth checking.
Why choose us
A radon result usually has money attached to it — a deal, a repair credit, a mitigation quote. The company producing that number should not be the company selling the fix. We test and we report, and that is where it ends. With more than 16,000 inspections completed and over 2,000 five-star reviews since 2009, we have been trusted with that number across Southeast and Mid-Michigan. We also handle home buyer inspections, pre-listing inspections, annual maintenance inspections, commercial building inspections and mold testing, pre-drywall inspections and 11-month builder’s warranty inspections.
Continuous monitors give the result the moment the 48 hours end.
So we have no reason to hand you a high number. The result is the result.
The body that sets how radon is measured, placed and reported.
Hour-by-hour logging and disturbance detection, which holds up in a transaction.
Including weekends, because a radon test sits on a closing date.
Reviews
Excellent service! Joe was Very friendly and respectful. He even showed up early and started before we arrived. He Went over results with us on the spot, was easy to talk to and very helpful. Being a first time home buyer, I am so happy I chose this inspection company. Highly recommend.
Casey MoranRiver Rouge, MITrademark is incredibly thorough! The ONLY inspectors I would trust with my home! From setting the appointment to climbing into the attic and crawling under the house, they are incredibly talented. Please do yourself the best favor, and always use and recommend Trademark!!
Paige CookNovi, MIOutstanding precision and attention to detail! Helps being able to make a truly informed decision about a home! Also, they are very veteran-friendly! No complaints here!
Desmond SheppardMichiganTrademark Inspection Services continues to impress! I’ve used them twice now for home inspections on potential properties, and both times they delivered exceptional service. Noah Scott, in particular, did a fantastic job—extremely thorough with the inspection and took the time to walk me through the findings afterward, answering every question with patience and clarity.
Donna GoodeMichigan5/5! I had a great experience with Inspector Mitch. He was super thorough and really took his time during the inspection. He explained everything clearly and made sure I understood every step of the process. He definitely knows his stuff and genuinely cares about doing a good job. I’d definitely recommend him to anyone needing a home inspection.
Au’ NaturelleMichiganNoah was awesome! He explained everything very clearly and concisely.
Tony WilsonMichigan
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Claim the Hero DiscountQualified and certified
Michigan requires no credential to test for radon, so the certification behind the person placing the monitor is the only thing separating a professional test from a guess. The one that governs radon measurement is IAC2. Each of these is issued by the organization named and verifiable with them directly.
The core credential from the International Association of Certified Home Inspectors. It commits the inspector to InterNACHI’s Standards of Practice and Code of Ethics, and to continuing education every year rather than a one-off exam.
The profession’s top-level board certification. It is earned through inspection experience and continuing education over time, not bought — which is why comparatively few inspectors in Michigan hold it.
National Home Inspector ExaminationThe independently written, psychometrically validated exam from the Examination Board of Professional Home Inspectors, used by most states that license home inspectors. Michigan licenses nobody and asks for no exam at all, so sitting it here is entirely voluntary — which is rather the point.
Certified through the Certified Commercial Property Inspectors Association, the standards body for commercial building inspections. Commercial work follows a different discipline to residential, and this is the credential that covers it.
The International Association of Certified Indoor Air Consultants sets the protocols for how mold is sampled, handled and reported. Following them is what makes a laboratory result defensible rather than just a number.
The same body certifies radon measurement separately, because the discipline is different: where the monitor sits, how long it runs and what counts as a disturbed test all decide whether the reading means anything.
Certification from the National Association of Mold Professionals, covering how mold is identified, sampled and documented — the difference between spotting a stain and understanding the moisture behind it.
Training in running a sewer line camera and, just as importantly, reading what it shows. Roots, bellies, breaks and blockages all look different on screen and are easy to misread without it.
Certified Residential ThermographerCertified by Monroe Infrared in thermal imaging. A thermal camera reveals what the eye cannot — moisture behind finishes, missing insulation and overheating electrical connections — but only if the person holding it is trained to interpret it.
Licensed by the Federal Aviation Administration to fly commercially. That is what makes aerial roof and property imagery legal to carry out and legal to hand you — and it means a steep or unsafe roof can still be inspected properly.
Our service area
We test across fourteen Michigan counties — Wayne, Oakland, Macomb, Washtenaw, Livingston, Genesee, Saginaw, Shiawassee, Lapeer, St Clair, Monroe, Lenawee, Jackson and Ingham — covering Metro Detroit, Ann Arbor, Flint, Saginaw and the communities in between. Tap a county to see where we work.
Not sure if we cover your area?
Call 734-331-3269 or schedule your inspection now.
Common questions
The things people ask us most before booking a radon test.
A colorless, odorless radioactive gas formed as uranium decays in soil and rock. It enters through cracks and openings in a foundation and accumulates indoors. Long-term exposure is the second-leading cause of lung cancer in the United States, and the leading cause among people who have never smoked.
A short-term test running a minimum of 48 hours. Because we use a continuous radon monitor rather than a canister, the result is available the moment the test finishes.
No. You carry on as normal, with one condition: keep windows and exterior doors closed as much as you reasonably can and avoid airing the place out. Ventilating during the test changes the answer.
Yes, through IAC2 — the International Association of Certified Indoor Air Consultants — and trained on professional continuous radon monitors. Michigan requires no credential to test for radon, so that certification is the thing worth checking.
The EPA recommends acting at or above 4.0 pCi/L, and suggests considering it between 2 and 4. On the Michigan AARST report card, 27% of buildings tested before mitigation were at or above 4.0, and another 27% fell between 2 and 4.
You appoint a licensed radon mitigation contractor, who installs a system to vent the gas before it enters the building. We do not install those systems — but we can retest afterwards to confirm the system is doing its job.
No, deliberately. Testing and mitigation should not come from the same company: if the business producing the number also sells the fix, the number is worth less. We test and report only.
No. Age, construction type and whether there is a basement do not predict the result. A newly built home can read higher than the older one next to it. The only way to know is to measure the building you are in.
You can buy a DIY kit, but it averages the whole period into one number with no record of conditions, no hour-by-hour data and no tamper detection. For anything attached to a property transaction, that is usually not good enough.
The EPA suggests every two years, and again after major renovations, foundation work, or changes to heating and ventilation — any of which can change how a building draws gas from the ground.
It depends on the property and whether you are booking it alongside an inspection, so we price it properly rather than quoting a number that turns out to be wrong. Call 734-331-3269 or book online and you will see the price before you confirm.
Yes. It can be set up during a home buyer inspection or a commercial building inspection for an additional fee, then collected when the 48 hours are up. It is an additional service, not part of a standard inspection.
Seven days a week, results the moment the test ends.
