Most homeowners pay $800–$2,000 to install a radon mitigation system, with typical averages of about $1,000–$1,600 for a standard sub-slab depressurization system. Crawl spaces, block walls or basements that need sealing can push the bill to $3,000–$8,000 (Angi, HomeGuide and Forbes Home data, as of October 2026).
Updated October 8, 2026. Source: Angi + 5 more. National US estimates.
You need a mitigation system when a radon test comes back at or above the EPA action level of 4 pCi/L. Radon is an odorless, radioactive gas that seeps up from the soil, and the EPA ranks it as a leading cause of lung cancer. The good news: most homes can be fixed in a day for about the cost of other common repairs.
This guide covers installed prices by foundation and system type, a line-item breakdown of a typical job, what drives the price up or down, and the running costs after installation. If your home has a dirt crawl space, compare the numbers with our crawl space encapsulation cost guide, because sealing the crawl space is often part of the fix.
Average cost
Installed prices for radon mitigation systems, national averages as of October 2026:
| Scenario | Typical range | Notes |
|---|---|---|
| Basic: slab or basement home, one suction point, exterior pipe | $800–$1,300 | Angi's typical range is $805–$1,326 (average $1,043) |
| Mid-range: larger home, interior routing or sump/drain-tile suction | $1,200–$2,500 | HomeGuide's national average is about $1,600 |
| Complex: crawl space membrane, block walls or basement sealing | $3,000–$8,000 | Crawl space encapsulation alone can run $1,500–$15,000 |
Cost by mitigation method
Ranges reported by Angi, HomeGuide and Forbes Home for the most common methods:
| Method | Typical installed cost | Best for |
|---|---|---|
| Active sub-slab depressurization | $1,000–$2,500 | Slab-on-grade and basement homes (most common) |
| Drain-tile suction | $700–$1,800 | Homes with existing perimeter drain tile |
| Sealed sump pit suction | $800–$2,500 | Basements with a sump pump |
| Block-wall depressurization | $1,700–$3,000 | Hollow concrete-block foundation walls |
| Passive depressurization | $500–$2,500 | New construction; low starting levels |
| Crawl space sub-membrane suction / encapsulation | $1,500–$15,000 | Dirt-floor crawl spaces |
| Basement sealing (as part of the fix) | $400–$4,600 | Cracks and openings; not a stand-alone fix |
Other radon costs to budget for
| Item | Typical cost | Notes |
|---|---|---|
| DIY radon test kit | $15–$60 | Short-term charcoal or alpha-track kits |
| Professional radon test | $150–$700 | Continuous monitor; often required in real estate deals |
| Permit | $25–$150 | Required in some cities and states |
| Electricity to run the fan | $30–$300 per year | Depends on fan size and local power rates |
| Extended warranty | $200–$500 | Optional; fans are often warrantied for about 5 years |
| Radon water treatment | $1,200–$5,000 | Only if well water tests high |
Cost breakdown: materials, labor, permits and extras
Line-item estimate for installing a standard active sub-slab depressurization system with one suction point and exterior vent pipe in a basement home. Ranges are national, as of October 8, 2026.
| Cost item | Typical range | What it covers |
|---|---|---|
| Fan, PVC pipe and fittings (materials) | $150–$450 | In-line radon fan ($100–$300+), vent pipe, manometer |
| Labor | $450–$1,000 | Coring the slab, digging the suction pit, running pipe above the roofline |
| Sealing cracks and sump lid | $0–$150 | Caulking floor joints and sealing an open sump |
| Electrical hookup | $0–$150 | Outlet or switch for the fan; electricians bill $50–$100/hour |
| Permit | $25–$150 | Only where your city or state requires it |
| Post-mitigation test & contingency | $0–$150 | Many installers include a follow-up test |
| Estimated total | $620–$2,050 | Before any discounts or rebates |
Labor is the largest share of the bill; the fan itself is usually only a few hundred dollars.
What affects the price
- Foundation type (slab, basement or crawl space). Slab-on-grade and basement homes with a gravel base are the cheapest to fix, usually $800–$2,500 with sub-slab suction. Dirt crawl spaces need a sealed plastic membrane, and full crawl space encapsulation can add $1,500–$15,000.
- Radon test results. Higher readings don't change the price much on their own, but very high levels or a stubborn result may call for a second suction point, a stronger fan or added sealing. The EPA recommends fixing at 4 pCi/L or more and considering it at 2–4 pCi/L.
- System design (usually sub-slab depressurization). Most contractors install active sub-slab depressurization ($1,000–$2,500). Drain-tile or sump-pit suction can be cheaper ($700–$2,500), while block-wall systems run $1,700–$3,000.
- Fan size and routing of the vent pipe. A standard in-line fan costs about $100–$300+. Routing the pipe up through closets and the attic takes more labor than running it up an outside wall, and larger fans use more electricity ($30–$300 a year).
- Size and layout of the home. Bigger homes, split levels or multiple foundation types may need two or more suction points; Angi reports larger homes can add $500–$1,500.
- Follow-up testing. The EPA says to retest within 30 days of installation (but no sooner than 24 hours) and then every two years. A DIY kit is $15–$60; a professional test is $150–$700, and some installers include the first follow-up test in the price.
Ways to save
- Test first with a $15–$60 DIY kit. If the result is borderline, run a second test before you pay for a system.
- Get at least three quotes from certified radon contractors; Angi notes that comparing bids tends to land homeowners near the national average of about $1,043.
- Ask your state radon program about grants, low-interest loans or free test kits; some local programs offset $500–$1,500 of the cost.
- Choose exterior pipe routing if the look is acceptable. It usually takes less labor than running the pipe through finished interior space.
- If you're buying a home, negotiate mitigation into the deal; sellers often pay for it after a high pre-sale test.
- Ask whether the post-mitigation test and a fan warranty are included so you don't pay for them separately later.
Related questions people ask
What is the average cost of a radon mitigation system?
The average radon mitigation system costs about $1,000–$1,600 installed. Angi puts the national average at $1,043 from more than 1,100 projects, while HomeGuide reports $1,600; most homeowners pay between $800 and $2,000.
How much does radon mitigation cost?
Radon mitigation usually costs $800–$2,000 for a slab or basement home. Expect $3,000–$8,000 or more when the job includes crawl space encapsulation, block-wall suction or extensive basement sealing.
What does it cost to install a radon mitigation system?
Installation of a standard sub-slab system runs about $800–$2,000 including the fan, pipe, sealing and labor. Add $25–$150 if your city requires a permit and $150–$700 if you hire a pro for the follow-up test.
How to get an accurate quote
Get at least three written quotes from radon contractors certified by your state or a national radon proficiency program. Give each one the same information:
- Your most recent radon test results, including the type of test and the dates it ran.
- Your foundation type (slab, basement, crawl space or a mix), the square footage and whether the basement is finished.
- Whether you have a sump pit or perimeter drain tile, and where you'd accept the vent pipe (outside wall, garage or interior chase).
- Ask what is included: fan model and warranty, crack sealing, electrical hookup, permit, and a post-mitigation test with a guaranteed result below 4 pCi/L.
FAQ
How long does radon mitigation take?
A typical sub-slab system is installed in one day, often in 4–8 hours. Crawl space membranes or multiple suction points can stretch the job to two days.
How much does a radon fan cost to run?
Expect about $30–$300 a year in electricity, depending on fan size and your power rates; HomeGuide estimates around $70–$80 for a typical system. Fans usually last 5–10 years before they need replacement.
Does a radon mitigation system really work?
Yes. The EPA says soil suction systems typically cut radon levels by 50% to 99%. Always confirm the result with a follow-up test after installation.
Can I just seal the cracks in my basement?
Sealing helps but rarely solves the problem on its own; the EPA does not recommend sealing alone. It's usually done alongside an active suction system.
More Radon & Asbestos costs
Sources
- Angi — How Much Does a Radon Mitigation System Cost? (updated Sep 28, 2026). Checked October 8, 2026.
- HomeGuide — How Much Does a Radon Mitigation System Cost? (2026) (Feb 5, 2026). Checked October 8, 2026.
- Forbes Home — How Much Does Radon Mitigation Cost? (updated Feb 7, 2025). Checked October 8, 2026.
- Bob Vila — How Much Does a Radon Mitigation System Cost? (updated Jul 29, 2022). Checked October 8, 2026.
- U.S. EPA — What is EPA's Action Level for Radon and What Does it Mean? (accessed Oct 2026). Checked October 8, 2026.
- U.S. EPA — Consumer's Guide to Radon Reduction (2016 edition). Checked October 8, 2026.
Prices are estimates and vary by location and provider. See our methodology and editorial policy. Browse all foundation & water cost guides.