What does radon mitigation cost? Compare professional and DIY solutions for your home
TL;DR: Radon mitigation can cost anywhere between $1,200–$2,500, depending on your home and layout. If your radon testing reveals levels at or above 4.0 pCi/L (or 150 Bq/m³ if you’re outside the US) then you need to mitigate your home for radon. There are a few DIY steps you can take first, for example sealing cracks in lower flooring, and increasing ventilation, however seeking professional advice is recommended, especially if you wish to install an active radon mitigation system.
In 2026, the national average for a professionally installed radon mitigation system in the United States ranges from $1,200 to $2,500. This is obviously an investment. So, if you’ve tested your home for radon and discovered that your average levels are high (at or above 4.0 pCi/L or 150 Bq/m³) and you’ve been monitoring for at least 90 days and see that radon is high, then it’s likely you need to mitigate to lower radon levels.
Discovering that your home has high radon levels can come as a shock. The next two questions are almost always: “How much is this going to cost me?” and “Can I just fix this myself?”
Why do you need to mitigate for radon?
Radon is the leading cause of lung cancer in non-smokers, responsible for over 21,000 deaths annually in the US (source: EPA: Health risk of radon). Because radon poses such a serious health risk, fixing the problem is non-negotiable. The good news is that radon is a very solvable home health issue, and mitigating is simple, effective, and long-lasting.
Want to learn more about radon? Read our in-depth guide, What is radon? Understanding the invisible gas and safe indoor levels.
Whether you are looking to hire a certified pro or try DIY fixes to solve your radon issue, here is the 2026 guide to radon mitigation costs, methods, and results.
1. How much does professional radon mitigation cost?
In 2026, a professional radon mitigation system in the US can cost anything between $1,200 and $2,500. While that price tag might seem high, a professional system (known as Active Sub-Slab Depressurization or ASD) is often the only way to bring levels above 4.0 pCi/L down to a safe range. Given that radon can cause serious health problems, it’s an investment that can bring long-term peace of mind.
What impacts radon mitigation price?
Not every home is the same, and several variables can push your estimate toward the higher end of the scale:
- Foundation type: A simple concrete slab is the cheapest to fix. If you have a crawl space that needs to be encapsulated (sealed with plastic), expect to add $500 to $1,500 in labor and materials.
- Home size and layout: Large homes or homes with multiple “add-ons” may require two suction points instead of one to pull enough air from under the entire footprint.
- Aesthetics: Hiding the PVC vent pipes inside a closet or routing them through the attic costs more in labor than a standard exterior “fan-on-the-wall” installation.
- Local labor rates: Prices in high-cost-of-living areas (like the Northeast or West Coast) generally trend 20–30% higher than the national average.
2. Can you fix a radon problem yourself?
If your radon levels are “borderline” (between 2.0 and 4.0 pCi/L), or if you want to try lowering your costs before calling a pro, there are several DIY steps you can take. Read our guide on DIY radon mitigation for more details.
Phase 1: Seal entry points (Cost: $100–$300)
Radon enters through cracks in building foundations and around windows or plumbing. By sealing these, you can reduce the “vacuum effect” that pulls gas from the soil, and also stop radon leaking inside.
- Foundation cracks: Use a high-quality, polyurethane-based self-leveling sealant. Do not use standard silicone; it won’t bond effectively to concrete long-term.
- Sump pump covers: An open sump pit acts like a radon chimney. You can buy a gas-tight sump cover kit for roughly $100.
- Floor drains: Install “trapless” floor drain seals that allow water out but stop soil gases from coming in.
Phase 2: Passive ventilation (Cost: $0–$50)
- The “window fix”: Opening windows in the basement creates a cross-breeze that dilutes radon.
- The warning: This is a temporary measure. It is not a sustainable solution during a US winter or peak summer, as it’ll only work if you can leave windows open, which is likely an unrealistic year-round solution.
3. Can you install your own radon mitigation system?
Technically, you can buy a radon fan and PVC pipe at a home improvement store for about $400–$600. However, both the EPA and Airthings strongly discourage DIY active mitigation for three critical reasons:
- Backdrafting risk: If a fan is installed incorrectly, it can pull carbon monoxide from your water heater or furnace into your living space, a potentially deadly mistake.
- Pressure field testing: Pros use “micromanometers” to ensure the fan is actually creating a vacuum under the entire floor. Without this, you might just be venting a small corner of your basement while the rest remains dangerous.
- Resale value: When you sell your home, the buyer’s inspector will look for a “Certified Mitigator” tag on the system. A DIY system may not pass inspection, forcing you to pay a pro to redo it anyway.
For help finding a professional, use the EPA’s guide to finding a certified radon mitigator in your area.
4. How do I know my radon mitigation worked?
Whether you spend $150 on DIY sealant or $2,000 on a professional system, you must verify that it is working. Radon systems can fail. PVC pipes can crack, and fans eventually wear out. More importantly, radon levels fluctuate with the weather. A system that works in the summer might struggle during a heavy spring rain or a freezing winter, so continuing to monitor is essential for long-term peace of mind.
How to know your house is safe from radon? Monitoring levels with a continuous digital monitor, for example with the Airthings Corentium Home 2 or View Plus, can help you keep track of your radon levels, and understand if the steps taken to mitigate have been successful.
- Before mitigation: Use a continuous digital monitor to establish your home’s radon average. You will see a useful picture within the first 30 days, but the EPA’s long-term threshold is based on 90 days or more, so let it run at least that long, preferably through the colder months.
- Mitigate if levels are consistently at or above 4.0 pCi/L (150 Bq/m³).
- After mitigation: Keep monitoring to ensure your levels stay below the EPA Action Level of 4.0 pCi/L year-round. If your fan ever dies or something shifts due to changes in the soil under your home and radon starts to rise again, your monitor will let you know via the connected app.
Read our guide, How to get started with radon testing in 2026, for more detail.
Do people actually act on their radon data?
Yes: Airthings’ radon data shows that once people start monitoring their homes and identify they have radon, they effectively mitigate.
The graph below shows radon data from 200 connected Airthings monitors with a radon sensor located in basements across Norway. The red line shows radon levels captured across 200 consecutive weeks (just under 4 years). As demonstrated, there is a downward trend in levels, going from around 200 Bq/m³ at the start of 2023, to around 100 Bq/m³ towards the end of 2024. While this data comes from Norwegian homes, the pattern holds globally; monitoring drives action on radon.
Airthings data summary from the graph above:
- Between week 2 and week 54, devices show a radon reduction from 201 Bq/m³ to 141 Bq/m³ — a 30% reduction
- Between week 12 and week 64, devices show a reduction from 160 Bq/m³ to 118 Bq/m³ — a 27% reduction
Frequently Asked Questions (FAQ)
Does homeowner’s insurance cover radon mitigation?
In almost all cases, no. Insurance typically views radon as a naturally occurring environmental hazard rather than “sudden and accidental” damage. However, some state programs offer grants or low-interest loans for radon reduction.
How long does a radon fan last?
A high-quality radon fan is designed to run 24/7 and typically lasts between 5 and 10 years. You should check your radon levels regularly via your Airthings monitor, to ensure the fan is working and your home’s radon levels remain below 4.0 pCi/L.
Will a radon system affect my energy bill?
An active system pulls air from under your house, not from inside it. While the fan uses a small amount of electricity (similar to a 60-watt lightbulb), it should not significantly impact your heating or cooling costs if installed correctly.
Can I deduct radon mitigation from my taxes?
If you are performing the mitigation for medical reasons (prescribed by a doctor) or if it is part of a home office improvement, you may be able to deduct a portion of the cost. Consult a tax professional for the latest IRS guidelines.
How long does radon mitigation take?
A professional sub-slab depressurization system can typically be installed in a single day. Most jobs take between three and five hours. More complex installations involving crawl spaces or multiple suction points may take a full day. You can return to normal activity in the home immediately after installation.
How do I find a certified radon mitigation contractor?
The EPA recommends using a state-certified or nationally certified contractor. You can search for a qualified professional in your area using the EPA’s official contractor directory. Look for contractors certified by the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB).
Will radon mitigation increase my home’s value?
A professionally installed and certified mitigation system is generally viewed positively by buyers and their inspectors. It demonstrates that the problem has been identified and properly resolved, which is preferable to an untested home. Some real estate markets, particularly in high-radon states, now expect radon test results as a standard part of disclosure.
How much does it cost to retest for radon after mitigation?
Investing in a continuous digital radon detector is the best way to make sure that the initial mitigation worked, and also that it continues to be effective. Radon levels can change if the soil shifts underneath your home or if you carry out renovation work, so continuous monitoring provides the best peace of mind.
What happens if my radon levels are still high after mitigation?
Contact your mitigation contractor. Most reputable installers offer a post-mitigation guarantee and will return to diagnose the issue at no additional cost. Common causes of persistent high levels include an undersized fan, insufficient suction points, or new cracks developing in the foundation. Your Airthings monitor will show you exactly when levels rise again, so you can act quickly.
Does radon mitigation work in all types of homes?
Yes, though the method varies. Sub-slab depressurization works for homes built on concrete slabs or with basements. Crawl space encapsulation combined with ventilation is used for homes built over a crawl space. Block wall ventilation addresses radon entering through hollow concrete block walls. A certified contractor will assess your foundation type and recommend the right approach for your specific home.
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