Do radon mitigation systems decrease the value of your house?

No. A radon mitigation system does not lower your home’s value, and in many sales it helps. It shows a buyer the air has been tested and fixed, which removes a worry instead of adding one. Installed radon mitigation runs $900 to $6,000, and most homes land around $1,950 to $2,250.

Here is the worry we hear. A homeowner sees the white pipe and the fan on the side of the house and thinks it tells every buyer the place had a problem. We get it, but that is not how a buyer reads it once they understand radon.

Radon is a natural radioactive gas that seeps up out of the soil and bedrock. New Hampshire sits on a lot of granite, and granite is one of the sources, so radon is common here. It is not a sign the house was built wrong or that anything is broken. A working mitigation system tells the buyer the seller dealt with it. The EPA sets the action level at 4.0 pCi/L and suggests you consider fixing between 2 and 4 pCi/L (epa.gov/radon). A house above that with no system is the one that scares buyers. The same house with a system that pulls the gas out from under the slab and vents it above the roofline is the calm one. The fix is done, and the next owner pays nothing.

What a buyer sees at the closing table

Most New England buyers test for radon during the inspection period. If they find a high number on a house with no system, that becomes a negotiation. They ask for a price cut or for you to install one before closing, often on a clock, and you lose leverage. If your system is already in, the test reads low and the deal moves on. That is the value: you traded a future fight for a finished job.

Radon mitigation is also cheaper to handle than most foundation work, so it rarely moves the appraisal much either way. The appraiser cares about square footage, condition, and comps; a radon fan is a small line item. The Insurance Information Institute is a good plain read on how home features factor into risk and value (iii.org).

What our system is and what it costs

For a normal basement or slab we install active sub-slab depressurization. A fan and a sealed pipe pull the radon from under the concrete and send it up and out above the roof. For a dirt or fieldstone crawl space we run sub-membrane depressurization, which seals a barrier over the dirt and pulls the gas from under it. We install both. Radon mitigation 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.

What drives that number is the foundation. A clean poured slab with a good spot for the pipe is the simple case. A fieldstone crawl, a finished basement, or a long run to get the vent above the roofline adds labor and material. We give you a real figure after we see it. The inspection and the estimate are free, and you get the quote within 24 hours.

Our radon work carries a 10-year warranty on the system. We do not guarantee a specific radon level unless we put that in writing, because the soil and the house both have a say in the final reading.

You do not need this if your levels test low, and we will tell you that. Test first. If you are under the action level, keep your money. Branden runs our radon side, and he would rather send you a clean test result than sell you a fan you do not need.

Does fixing radon help the rest of the basement?

A radon system is for air, not water. If your basement is also damp, that is a separate fix. Water pools at the foundation because the backfill around the house is disturbed soil that drains slow and holds water, and NH frost can push on the walls. That is a job for our Forever Dry System, which is full-perimeter interior drainage, a sump pump, a wall vapor barrier, and a dehumidifier. A dry basement and a low radon reading both help at resale, and they are two different systems.

If your crawl space is the problem instead, that is crawl space encapsulation, and your radon fix down there is the sub-membrane version above. The DOE notes that a large share of a home’s heat loss can come from an uninsulated foundation or crawl (basc.pnnl.gov), so sealing that space tends to pay you back in comfort too.

For more on the radon side, see our radon mitigation page. For everything we stand behind, see the 603 guarantee. And if structure is part of your sale prep, start at structural and foundation repair.

We are 603 Basement Solutions out of East Kingston, trusted by 5,000+ homeowners in New England, Google rated 4.9 across 250 reviews, BBB A+ accredited, licensed and insured, and state radon certified.

Ready to test or fix before you list?

Call us at 603-610-1770 or book your free inspection. We will test, give you a clear number, and tell you whether you even need a system before you spend a dime.

Related questions

Does a radon system have to run all the time? Yes. The fan runs continuously so the gas keeps getting pulled out and vented. It uses about as much power as a low-watt light bulb, and our systems carry a 10-year warranty.

Will a radon system fix a wet basement? No. Radon mitigation moves air, not water. A wet basement needs interior drainage and a sump, which is our Forever Dry System. You can have both done.

Do I have to retest after a radon system is installed? A follow-up radon test is the homeowner’s call and is easy to do yourself with a kit. NH DHHS and the EPA both publish guidance on testing (epa.gov/radon).

Can you put a radon system in a dirt crawl space? Yes. For a dirt or fieldstone crawl we install sub-membrane depressurization, which seals a barrier over the soil and pulls the radon from under it. Pricing lands at $900 to $6,000, and most homes land around $1,950 to $2,250 after we see the space.