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Find Radon gas testers in Windham

Avatar for Airtight Radon Solutions LLC
Airtight Radon Solutions LLC
5.0(
19
)

Serving Windham, NH and surrounding areas

Approved

Super Service Award Winner

In business since 2024

Free estimates

Offers commercial services

"Marcel performed a flawless installation of a Radon Mitigation system in my home. He thoroughly explained and shared testing results as he proceeded with the installation. He continually checked and rechecked his measurements and cuts making sure everything was level and plumb. I'm a very meticulous customer and I was completely satisfied with my new system. He left an instrument to monitor my radon levels for a few days just to be absolutely sure that everything is performing as it should be. If you need Radon Mitigation...I HIGHLY recommend Airtight Radon Solutions."
My Projects
Radon Mitigation Ranch
Response time6 hrs
Response rate95%
15 neighbors recently requested a quote
Avatar for True North Home Inspections, LLC
True North Home Inspections, LLC
4.9(
24
)

Serving Windham, NH and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"John was great, came to inspect our home in Rochester and was professional and had every piece of equipment you could need to give us a detailed look into our house. Even when the seller made a mistake on the sewer and water system types John helped us test both and went above and beyond. Cannot recommend enough if you want a the best and safest bet for an inspection!"
Response time3 hrs
Response rate88%
5 neighbors recently requested a quote
Avatar for Erickson Foundation Solutions
Erickson Foundation Solutions
4.5(
51
)

Serving Windham, NH and surrounding areas

Approved

In business since 1979

Free estimates

Emergency services offered

"I hired Erickson Foundation for radon mitigation. Job went smoothly. They communicated well, were very professional, and reviewed all potential options for the job with me. The system installation was done on time, professionally done, and well cleaned-up. The equipment is high quality, with the 10-year warranty being a big plus."
Sinking Step Repair
Settling Home Addition
Settling Slab
EZ Posts for deck addition
Foundation Crack Repair

+56

Response time1 day
26 neighbors recently requested a quote
Recommended by88%of homeowners
Avatar for Advanced Radon Mitigation & Water Treatment
Advanced Radon Mitigation & Water Treatment
5.0(
27
)

Serving Windham, NH and surrounding areas

In business since 1997

Free estimates

Warranties offered

"Amazingly well. I spoke with Keith first thing in the morning and he was here at three pm to replace a faulty fan. To top things off the fan was under warranty. They did diagnostics to prove the system was working after the repair and were on their way. This was just unbelievable service. I would recommend them to anyone."
Recommended by100%of homeowners
Avatar for Morrison Home Inspections LLC
Morrison Home Inspections LLC
5.0(
52
)

Serving Windham, NH and surrounding areas

In business since 1983

Free estimates

Warranties offered

"Kevin Morrison is a classy, honest, punctual, responsive and a very thorough professional. I had him help me inspect a home I am planning to buy and was extremely pleased with his work. He answered emails, texts, and phone calls was very patient, showed 5 mins before the job start, came back on the weekend to install radon kit and back on Monday to collect it. Very respectful of people's properties and personable. He is a straight shooter and never tells you what you want to hear, but rather what you need to know. I will definitely hire Kevin for any home related work that he would be willing to do and recommend him confidently for home buying inspection."
Recommended by98%of homeowners
Avatar for Seacoast Inspections LLC
Seacoast Inspections LLC
4.9(
71
)

Serving Windham, NH and surrounding areas

In business since 2003

Free estimates

Emergency services offered

"Terry was absolutely perfect for the job. He was very thorough and explained everything to us in layman's terms. He was able to give us plenty of information about things to look for in old homes and had us follow him around during the inspection to point things out to us. By the time he left, we had all of the information we needed. Less than 48 hours later, we had a comprehensive inspection report sitting in our inbox. I would recommend him to anybody who is looking to know all there is to know about a house."
Recommended by95%of homeowners
Avatar for Environmental Testing & Research Laboratories, Inc
Environmental Testing & Research Laboratories, Inc
4.8(
347
)

Serving Windham, NH and surrounding areas

In business since 1995

Free estimates

Warranties offered

"<p>it was superb! they easiest, hassle free Radon test in town, with extremely proficient people -- very knowledgeable and very people-friendly! they took their time to explain things on the phone to me before I committed. the test came back within 10 days or so -- via email. which is very convenient. it was very clear as it is, but I like talking through it and get advice. they were instantly available to discuss. they gave me future tips to keep on top of all things Radon related. </p> <p>I have to say that all this comes to be after 3 months of many back and forths with 3 other companies -- none of the other companies could be bothered to schedule a time, and those who did, never showed up.. many times over. I don't know why I was so patient with them and I wish had discovered Environmental Testing & Research Laboratories much sooner.</p> <p>Really highly recommend them!</p> <br />"
Recommended by93%of homeowners
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FAQs for radon gas testing projects in Windham, NH

Radon is the second leading cause of lung cancer in the U.S. The gas seeps through cracks in foundations and collects in basements and other low areas. Once you breathe it in, radioactive particles lodge in lung tissue and do long-term damage. Because you can’t see or smell radon, the EPA recommends testing your home every two years—and after major renovations—to keep your family safe.

Yes—every home should be tested. The EPA advises doing it at least every two years and any time you remodel, buy, or sell. On average, one in 15 houses nationwide sits above the recommended limit, and the only way to know where yours stands is a formal test. The equipment simply measures gas levels and won’t change your indoor environment, so the process is completely harmless.

Certified radon professionals—often home inspectors or dedicated radon mitigation contractors—handle testing. These radon testing professionals follow EPA protocols and use calibrated instruments to check levels throughout your house. Hiring a certified radon specialist means results you can trust for real estate deals, insurance requirements, and, most importantly, your family’s health.

Inspectors specialize in measuring radon gas levels, while licensed mitigation contractors design and install the systems that remove it. If your test comes back high, your inspector can point you to a qualified mitigation pro who will size and install the right fan, piping, or other equipment to bring levels down.

No—standard home air purifiers don’t touch radon. They’re built to trap dust and pollen, not radioactive gas. If testing shows high levels, you’ll need a dedicated mitigation system that vents the gas from beneath your home to the outdoors. Relying on a room purifier alone won’t keep your indoor air safe.

Opening a few windows in your home might dilute radon for a short time, but the gas seeps back in as soon as they’re closed. For a lasting fix, you’ll need a professional mitigation system—often a sub-slab depressurization fan—that pulls radon from beneath the foundation and safely vents it outside.

The Windham, NH homeowners’ guide to radon gas testings

From average costs to expert advice, get all the answers you need to get your job done.