Did you have radon mitigation done in your home? What things should you know first?

Yes, and the short version is this: radon mitigation works, and most homes need an active sub-slab system that vents the gas up and out above the roofline. A typical 603 radon system runs $900 to $6,000, and most homes land around $1,950 to $2,250, and a radon test is $50, credited toward the job if you move ahead. Before you do anything, test first. You never want to pay to fix a number you never measured.

Here in New Hampshire we see high radon a lot. It is a natural gas that seeps up out of the granite and soil under your home, and you cannot see it or smell it. The EPA action level is 4.0 pCi/L. At 4.0 or above, you fix it. Between 2 and 4, the EPA says you can consider fixing it (epa.gov/radon). NH DHHS publishes radon guidance for our state too, and a lot of NH homes test high.

So step one is a test. Get a real reading. Then you know if you even need us.

If your number is high, the standard fix is active sub-slab depressurization. We drill through the concrete slab, set a suction point under the floor, and run a sealed pipe up through the house with an inline fan that runs all the time. The fan pulls the radon out from under the slab before it ever gets into your living space and pushes it out above the roof. Quiet, low power, set it and forget it. That is the whole idea.

Got a dirt or fieldstone crawl space instead of a poured slab? Then we do sub-membrane depressurization. Same principle, but we seal a membrane over the dirt floor and pull the radon out from under that. We install both kinds. Branden runs our radon work. The crew calls him B-Radon, which tells you how much of this he does.

What drives the cost? The layout of your basement. How many suction points you need. The pipe run from the slab to the roofline, and how easy that route is. A simple ranch with one open basement is cheaper than a chopped-up house with finished rooms and a long pipe run. The price is $900 to $6,000, and most homes land around $1,950 to $2,250, and we give you a firm quote within 24 hours after the free inspection.

You do not need a radon system just because your neighbor got one. Granite and soil change from lot to lot. Test your own house. If you are under 2 pCi/L, you do not need this yet. We will tell you that, and we will not sell you a fan you do not need.

One more thing people ask about. After your system is in and running, the EPA recommends you retest your own home to confirm the level dropped. That retest is on you, the homeowner, not on us. We build and warranty the system. You confirm the number.

Speaking of warranty, our radon mitigation carries a 10-year warranty on the system. We do not guarantee a specific radon level unless we put that in writing, because the gas coming up from the ground is not something we control. What we control is the system pulling it out, and that we stand behind. See the 603 guarantee.

While we are under your house, we often spot other things. A wet floor wall joint. A musty crawl space. If radon is getting in through the slab, water might be too. If that is the case we can talk about basement waterproofing with our Forever Dry System, or crawl space services for encapsulation. Separate jobs, but it is smart to look once while we are there. We will not pile it all on one bill if you do not need it.

We are 603 Basement Solutions out of East Kingston, NH. We serve New Hampshire, Maine, and Massachusetts. Trusted by 5,000+ homeowners in New England, 4.9 on Google across 250 reviews, BBB A+ accredited, licensed and insured, OSHA-certified, with state radon certification on file. Branden is certified to do this work, and we self-perform it.

Ready to find out where your home stands? Call us at 603-610-1770 or book your free inspection. Free inspection, free estimate, quote within 24 hours. Financing is available through Hearth, subject to approval, and we make nothing on it!

Related questions

How much does radon mitigation cost in New Hampshire? A 603 radon mitigation system runs $900 to $6,000, and most homes land around $1,950 to $2,250, and a radon test is $50, credited toward the job if you move ahead. The final number depends on your basement layout, how many suction points you need, and the pipe run to the roof. You get a firm quote within 24 hours after a free inspection.

What radon level is dangerous? The EPA action level is 4.0 pCi/L. At or above that, you should fix it. Between 2 and 4, the EPA says consider it (epa.gov/radon). Below 2, you are in good shape and likely do not need a system.

Do I need to retest after radon mitigation? Yes, and that retest is the homeowner’s job. The EPA recommends confirming your level dropped after a system is installed. We build and warranty the system. You take the follow-up reading to confirm the new number.

Can you put radon mitigation in a dirt or fieldstone crawl space? Yes. For a dirt or fieldstone crawl we install sub-membrane depressurization. We seal a membrane over the dirt floor and pull the radon out from under it, then vent it above the roof. Same idea as a slab system, built for a crawl.