How Much Does a Radon Mitigation System Cost in 2026?
By Michael JohnsonUpdated 14 sources comparedHow we estimate
A professionally installed radon mitigation system typically costs $1,000 to $2,000, with a midpoint estimate of about $1,200. Most homes with a basement or slab get a sub-slab depressurization system. Crawl spaces, hollow block walls, large homes and mixed foundations can push the price to $3,000 or more. Plan for operating costs too: roughly $30 to $300 a year for the fan, and a fan replacement every 5 to 10 years.
- Typical cost
- $1,000–$2,000
- National average
- $1,200
- Full range
- $500–$5,000
The typical range is the median of six national and state-agency figures for a professionally installed active soil depressurization system in a single-foundation home; block-wall, crawl space and combined-foundation systems often cost $1,500–$3,000 or more. Prices are per installed system.
Why sources disagree on radon mitigation cost
National cost platforms and state radon programs report noticeably different numbers:
| Source | Average or typical cost |
|---|---|
| Angi (2025 data) | $1,000 average; $800–$1,300 typical |
| HomeAdvisor / Angi (April 2024) | $1,032 average; $787–$1,280 typical |
| Wisconsin DHS (2026) | $1,000–$2,000 average installation; retrofit "about $1,200" |
| North Carolina DHHS Radon Program | About $1,500 (roughly $1,000–$2,500) |
| HomeGuide | $1,600 average; $1,200–$2,000 typical |
| Minnesota Department of Health (2024) | Generally $1,500–$3,000 |
Our $1,000 to $2,000 typical range is the median of the low and high ends above. The $1,200 midpoint is the median of the averages. The cold-climate state programs report higher costs than the national platforms. That likely reflects deeper basements, more complex homes and state licensing in some of those markets. Minnesota's health department warns homeowners to be wary of mitigation rates under $1,000.
The EPA doesn't publish a dollar figure. It says most homes can be fixed for about the same cost as other common home repairs, and it recommends getting estimates from qualified contractors.
Estimate your cost
Pick the system your foundation needs (ask your contractor if unsure), choose your home's size, and add any testing or permit costs your quote doesn't already include.
Ranges come from the sources listed at the end of this guide. The labor portion is adjusted for your state with BEA price data. Your final price depends on site conditions and local codes.
Radon mitigation system cost by type
| System type | Best for | Typical installed cost |
|---|---|---|
| Sub-slab depressurization (active soil depressurization) | Basements and slab-on-grade homes | $1,000–$2,000 ($2,500+ in large homes) |
| Drain-tile suction | Basements with an existing perimeter drain | $800–$1,800 |
| Sealed sump pit suction | Homes with a sump pit | $800–$2,500 |
| Block-wall suction | Hollow concrete block foundation walls | $1,500–$3,000 |
| Sub-membrane depressurization | Crawl spaces | About $1,500–$3,000 (see note) |
| Combined system | Basement or slab plus a crawl space | About $2,000–$4,000 (our estimate) |
| Passive soil suction | Lower-level radon, or new homes | $500–$2,500 |
| Radon-resistant new construction | Built in during construction | $250–$750 to the builder (EPA) |
Sources: HomeGuide, HomeAdvisor/Angi, Angi, Wisconsin DHS, Minnesota Department of Health, EPA.
A note on crawl space and combined systems. None of the current national guides we reviewed price sub-membrane systems separately. The Minnesota Department of Health describes the method: plastic sheeting covers the dirt floor, runs up the walls, gets sealed, and a pipe vents soil gas from beneath it. We use Minnesota's general $1,500 to $3,000 range for crawl spaces. Full crawl space encapsulation is a bigger moisture-control project and costs $3,000 to $8,000 (HomeGuide). For homes with both a basement or slab and a crawl space, a 2021 guide from Upgraded Home notes that mixed foundations can roughly double cost. Our $2,000 to $4,000 combined estimate rests on that older observation, so ask for an itemized quote.
Cost by home size
Angi's 2025 data shows how size affects price:
| Home size | Typical cost |
|---|---|
| Up to 1,500 sq ft | $800–$1,200 |
| 1,500–2,500 sq ft | $1,200–$2,000 |
| 2,500–4,000 sq ft | $2,000–$3,000 |
Larger footprints may need more than one suction point, a stronger fan or longer pipe runs.
Radon testing costs (before and after)
| Test | Typical cost |
|---|---|
| DIY short-term kit (2–7 days) | $10–$40 |
| DIY long-term kit (90+ days) | $25–$60 |
| Professional radon test | $125–$700 (Angi's 2026 average: $421) |
| Continuous electronic monitor | $100–$300 |
| Post-mitigation verification test | $50–$200 |
Sources: Angi (2026), HomeGuide.
The EPA recommends fixing your home if radon is 4 pCi/L or higher. Because no level of radon exposure is known to be safe, it also suggests considering mitigation between 2 and 4 pCi/L (EPA action level guidance). For comparison, the average U.S. home measures about 1.3 pCi/L and outdoor air about 0.4 pCi/L.
After installation, retest to confirm the system works. Minnesota's health department says to wait at least 24 hours after the system starts running, and to get a valid test showing reduced levels before making full payment. Retesting every couple of years and after major renovations is a sensible habit.
Labor vs. materials
The hardware is relatively inexpensive. Angi lists a radon fan at $100 to $350, PVC piping at $50 to $200 and a monitor or alarm at $50 to $300. It estimates a simple DIY system's materials at $300 to $700, against $800 to $2,500 for a professional install. Most of what you pay for is diagnostics, system design, drilling and sealing, pipe routing, electrical hookup and the certified installer's time.
We estimate the labor share at 60%. That's the portion we adjust by state.
What drives the price up or down
- Foundation type. Open basements and slabs with good gravel underneath are the cheapest. Hollow block walls, crawl spaces and mixed foundations cost more.
- Sub-slab material. Tight clay or no gravel layer may require more suction points.
- Home size and layout. Larger footprints and divided slabs often need extra suction points.
- Pipe routing. Running pipe up through the house and attic, rather than up an outside wall, takes more labor but can look better and keep the fan out of sight.
- Sealing. Basic sealing of cracks and the sump lid is usually included. Full basement sealing is a separate project: about $4,600 for an unfinished basement (HomeAdvisor), and HomeGuide lists $4,500 to $15,000.
- Electrical work. The fan needs a nearby outlet or a hard-wired circuit. Minnesota notes that electrical licensing rules may apply.
- Starting radon level. Very high readings may need a stronger fan or more suction points to get below 4 pCi/L.
Radon mitigation cost by state
Radon risk varies by region, and so do contractor rates. The table below starts from our national range, compiled from the national and state-agency sources on this page, and adjusts only the labor portion (60%) using U.S. Bureau of Economic Analysis Regional Price Parities for each state.
| State | Typical range | Average | vs. U.S. |
|---|---|---|---|
| Alabama | $940–$1,900 | $1,150 | -6.0% |
| Alaska | $1,000–$2,000 | $1,200 | +1.0% |
| Arizona | $1,000–$2,000 | $1,200 | +0.7% |
| Arkansas | $920–$1,850 | $1,100 | -8.1% |
| California | $1,100–$2,150 | $1,300 | +7.6% |
| Colorado | $1,000–$2,000 | $1,200 | +0.8% |
| Connecticut | $1,000–$2,050 | $1,250 | +2.2% |
| Delaware | $1,000–$2,000 | $1,200 | -0.4% |
| District of Columbia | $1,050–$2,150 | $1,300 | +6.5% |
| Florida | $1,000–$2,050 | $1,250 | +2.1% |
| Georgia | $980–$1,950 | $1,200 | -2.0% |
| Hawaii | $1,050–$2,100 | $1,250 | +5.2% |
| Idaho | $950–$1,900 | $1,150 | -5.2% |
| Illinois | $990–$2,000 | $1,200 | -0.7% |
| Indiana | $950–$1,900 | $1,150 | -4.7% |
| Iowa | $930–$1,850 | $1,100 | -6.7% |
| Kansas | $940–$1,900 | $1,150 | -6.0% |
| Kentucky | $940–$1,900 | $1,150 | -5.7% |
| Louisiana | $930–$1,850 | $1,100 | -7.0% |
| Maine | $980–$1,950 | $1,200 | -1.7% |
| Maryland | $1,000–$2,050 | $1,250 | +2.4% |
| Massachusetts | $1,050–$2,100 | $1,250 | +4.9% |
| Michigan | $970–$1,950 | $1,150 | -3.5% |
| Minnesota | $990–$2,000 | $1,200 | -1.0% |
| Mississippi | $920–$1,850 | $1,100 | -7.6% |
| Missouri | $950–$1,900 | $1,150 | -4.9% |
| Montana | $940–$1,900 | $1,150 | -5.9% |
| Nebraska | $940–$1,900 | $1,150 | -5.8% |
| Nevada | $980–$1,950 | $1,200 | -1.8% |
| New Hampshire | $1,050–$2,050 | $1,250 | +3.2% |
| New Jersey | $1,050–$2,100 | $1,250 | +5.3% |
| New Mexico | $940–$1,900 | $1,150 | -5.8% |
| New York | $1,050–$2,100 | $1,250 | +4.6% |
| North Carolina | $960–$1,950 | $1,150 | -3.5% |
| North Dakota | $930–$1,850 | $1,100 | -6.8% |
| Ohio | $950–$1,900 | $1,150 | -4.9% |
| Oklahoma | $930–$1,850 | $1,100 | -7.0% |
| Oregon | $1,050–$2,050 | $1,250 | +2.8% |
| Pennsylvania | $980–$1,950 | $1,200 | -1.5% |
| Rhode Island | $1,000–$2,000 | $1,200 | +0.8% |
| South Carolina | $960–$1,900 | $1,150 | -4.1% |
| South Dakota | $930–$1,850 | $1,100 | -7.1% |
| Tennessee | $960–$1,900 | $1,150 | -4.5% |
| Texas | $980–$1,950 | $1,200 | -1.7% |
| Utah | $970–$1,950 | $1,150 | -3.0% |
| Vermont | $980–$1,950 | $1,200 | -2.0% |
| Virginia | $1,000–$2,000 | $1,200 | +0.4% |
| Washington | $1,050–$2,100 | $1,250 | +5.2% |
| West Virginia | $940–$1,900 | $1,150 | -6.1% |
| Wisconsin | $960–$1,900 | $1,150 | -4.1% |
| Wyoming | $940–$1,900 | $1,150 | -5.5% |
State estimates show cost, not risk. Any home in any state can test high, so test before you decide.
Who can install a radon system: certification and licensing
The EPA recognizes two national credentialing programs for radon professionals: the National Radon Proficiency Program (NRPP) and the National Radon Safety Board (NRSB). State radon programs publish lists of providers credentialed either through those programs or through a state license (EPA guidance).
- Some states require a license. Minnesota, for example, requires anyone doing radon mitigation to be licensed by its Department of Health. Check your state radon program before hiring.
- Elsewhere, ask for NRPP or NRSB certification. North Carolina and Wisconsin both recommend hiring a certified professional and asking for proof of certification in the proposal.
DIY? Materials for a simple system can cost $300 to $700 (Angi), but state programs recommend a certified professional. A well-designed system needs pressure-field testing, proper fan placement and a discharge point that won't send radon back into windows. Where licensing is required, installing a system for someone else without a license isn't legal. Whoever installs it, retest to confirm it works.
New homes. The EPA says radon-resistant construction typically costs a builder $250 to $750 (EPA). Wisconsin notes that a passive system costs about 50% to 70% of a retrofit. If you're building, ask for it up front. A passive stack can be activated with a fan later if testing shows elevated radon.
Operating and maintenance costs
Radon systems run around the clock, so budget for ongoing costs:
- Electricity: HomeGuide estimates about $70 to $80 a year. HomeAdvisor gives $30 to $300 a year, based on about 876 kWh at $0.10 per kWh. Higher electricity rates push that up.
- Heating and cooling loss: the system draws a small amount of conditioned air out of the house. Wisconsin DHS puts fan energy plus heating loss at about $200 a year in northern climates.
- Fan replacement: $150 to $400 every 5 to 10 years (HomeAdvisor, Angi). Most fans carry about a 5-year warranty (HomeGuide).
- Alarm or monitor batteries: about $10 to $30 a year (Angi).
Check the U-tube manometer on the pipe regularly. If the liquid levels are even, the fan has likely stopped.
How to save money on radon mitigation
- Test first, and test right. A $10 to $40 short-term kit tells you whether you need to act. Confirm a borderline result with a second test before spending $1,000 or more.
- Check your state radon program. Some states offer free or discounted test kits, and Minnesota notes that financial assistance may be available.
- Get two or three quotes from certified or licensed mitigators. Ask each one to explain the design: number of suction points, fan model and pipe route.
- Build it in. If you're building new, radon-resistant features cost a fraction of a retrofit.
- Combine projects. If you're finishing a basement, encapsulating a crawl space or doing foundation repair, install radon piping while walls and floors are open.
- Choose an efficient fan sized to your home. An oversized fan costs more to run every year.
How to compare radon mitigation quotes
A good quote includes:
- the installer's NRPP, NRSB or state license number
- system type, number of suction points and fan model
- pipe route (interior or exterior) and discharge location above the roofline
- sealing of accessible cracks, sump lids and openings
- electrical work, and who performs it
- a manometer or alarm
- a post-mitigation test, or a requirement that you provide one, plus a target such as below 4 pCi/L
- warranty on labor and the fan, and whether it transfers when you sell
Red flags:
- no certification or license where your state requires one
- a price well below local norms (Minnesota cautions against rates under $1,000)
- full payment before a post-mitigation test
- no performance target or retest plan
- a discharge point near windows, doors or at ground level
Hidden and extra costs people forget
- Pre-purchase or follow-up testing ($50 to $700) if not included.
- Electrical outlet or circuit for the fan.
- Permits: $25 to $150 where required, often included in the quote.
- Crawl space vapor barrier or encapsulation if moisture is also a problem. Damp crawl spaces can also grow mold, so see our mold removal cost guide.
- Finishing work: boxing in interior pipe runs or painting exterior pipes.
- Radon in well water needs a separate water treatment system, which HomeAdvisor prices at $500 to $5,000.
Bottom line
Most radon mitigation systems cost $1,000 to $2,000 installed, with a typical midpoint of about $1,200. Crawl spaces, block walls, large homes and mixed foundations can cost $3,000 or more. Test first. The EPA says to fix at 4 pCi/L or higher and to consider fixing between 2 and 4. Hire an NRPP- or NRSB-certified or state-licensed mitigator, and don't make final payment until a post-mitigation test shows the system works. Budget roughly $30 to $300 a year to run it, plus a fan every 5 to 10 years.
Frequently asked questions
How much does a radon mitigation system cost?
Most professionally installed systems cost $1,000 to $2,000, and the median of the national and state figures we compiled is about $1,200. Angi and HomeAdvisor report averages near $1,000, while HomeGuide and state radon programs in North Carolina and Minnesota report $1,500 or more. Crawl spaces, hollow block walls, large homes and mixed foundations push costs to $3,000 or higher.
At what radon level should I install a mitigation system?
The EPA recommends fixing your home if radon tests at 4 pCi/L or higher. Because no level of radon exposure is known to be safe, the EPA also suggests considering mitigation for levels between 2 and 4 pCi/L. The average U.S. home measures about 1.3 pCi/L.
How much electricity does a radon fan use?
Estimates range widely. HomeGuide puts operating cost at about $70 to $80 a year, and HomeAdvisor at $30 to $300 a year depending on fan size and electricity rates. Wisconsin's health department notes that in northern climates the fan plus the heated air it draws out can cost about $200 a year.
How long does a radon fan last and what does replacement cost?
Fans typically need repair or replacement after 5 to 10 years, and most manufacturers offer about a 5-year warranty. Replacement runs about $150 to $400 installed. Check the system's manometer or alarm regularly so you know the fan is still running.
Can I install a radon mitigation system myself?
Angi estimates DIY materials at $300 to $700, but the EPA and state radon programs recommend a certified professional. Some states, including Minnesota, require radon mitigators to be licensed. A poorly designed system may not lower radon enough, and you would need to retest to know whether it works.
How much does radon testing cost?
DIY short-term test kits cost about $10 to $40 and long-term kits about $25 to $60. A professional test costs roughly $125 to $700, and continuous electronic monitors cost $100 to $300. Some states offer free or discounted test kits through their radon programs.
Does radon mitigation cost less in new construction?
Yes. The EPA says building radon-resistant features into a new home typically costs a builder $250 to $750, and possibly less if the builder already uses similar moisture-control techniques. A passive system can later be activated with a fan if testing shows elevated radon.
Sources
We compared these sources to build the QuoteRuler range. State figures adjust the labor portion (60% of the total) using the BEA Regional Price Parities.
- How Much Does Radon Mitigation Cost? — HomeGuide. Used for: average $1,600, typical $1,200–$2,000, range $500–$8,000; sub-slab $1,200–$2,000; block wall $1,800–$3,000; drain tile $900–$1,800; testing ($10–$30 DIY, $125–$400 pro, monitors $150–$300); electricity $70–$80/yr; 5–10 yr fan life; permits $25–$150.
- How Much Does Radon Remediation Cost? [2025 Data] — Angi. Used for: average $1,000, typical $800–$1,300; cost by home size; component and DIY material costs; post-install test $50–$200; fan replacement $150–$350; permits $50–$200.
- How Much Does a Radon Mitigation System Cost to Install? — HomeAdvisor / Angi. Used for: average $1,032, typical $787–$1,280 (page updated April 2024, older than our other sources); drain tile $800–$1,700; block suction $1,500–$3,000; fan $110–$320; operating cost $30–$300/yr; fan repair/replacement $150–$400.
- Radon Testing Cost — Angi. Used for: 2026 testing prices: short-term kit $10–$40, long-term kit $25–$60, professional $150–$700 (average $421), continuous monitor $100–$250.
- Radon Mitigation — North Carolina DHHS Radon Program. Used for: average contractor cost about $1,500 (roughly $1,000–$2,500); NRPP and NRSB certification.
- Reduce Radon in Your Home — Wisconsin Department of Health Services. Used for: average installation $1,000–$2,000 (revised Oct 2026); hire NRPP- or NRSB-certified contractor.
- Radon Resistant Construction — Wisconsin Department of Health Services. Used for: retrofit system about $1,200; passive system 50–70% of retrofit cost; fan energy plus heating loss about $200/yr in northern climates.
- Radon Mitigation Systems — Minnesota Department of Health. Used for: costs generally $1,500–$3,000 (updated Oct 2024); sub-membrane crawl space method; retest at least 24 hours after system starts.
- Radon Mitigation — Minnesota Department of Health. Used for: Minnesota requires radon mitigators to be MDH-licensed; avoid mitigation rates under $1,000; get a valid post-mitigation test before full payment.
- What is EPA's Action Level for Radon and What Does it Mean? — U.S. EPA. Used for: fix at 4 pCi/L; consider fixing at 2–4 pCi/L; average indoor 1.3 pCi/L, outdoor 0.4 pCi/L.
- How much can a radon mitigation system cost? — U.S. EPA. Used for: most homes can be fixed for about the cost of other common home repairs; get estimates from qualified contractors.
- Radon-Resistant New Construction for Home Buyers — U.S. EPA. Used for: radon-resistant features typically cost a builder $250–$750.
- Find a Radon Test Kit or Measurement and Mitigation Professional — U.S. EPA. Used for: credentialing through state programs or the NRPP and NRSB national proficiency programs.
- Radon Mitigation Cost — Upgraded Home. Used for: 2021 data (older): mixed foundations can roughly double cost; used only to frame the combined-system estimate.
- Regional Price Parities by State, 2023 — U.S. Bureau of Economic Analysis. Used for: state cost adjustments.