Radon Mitigation Cost (2026): $748–$1,529 per Project
Author: CostGuideHQ Editorial·✓ Fact-checked·Updated July 2026·5 min read·6 sources Quick answerQuick answer: A radon mitigation system typically costs $748 to $1,529 installed, averaging around $1,028 nationally. Simple passive systems start near $500, while active fan-powered systems on complex foundations can run $2,500 to $3,000 or more.
- ✓The national average for a radon mitigation system is about $1,028 (HomeAdvisor), close to Angi's $1,032 and Bob Vila's $978.
- ✓Most homeowners pay between $748 and $1,529 for a complete installed system (Thumbtack).
- ✓Passive soil depressurization systems run $500-$2,500, while active fan-powered systems run $800-$2,500, or up to $3,000 for larger, complex homes (Bob Vila, HomeAdvisor).
- ✓Professional radon testing adds $150-$800, and permits typically run $25-$150 on top of the system cost (HomeAdvisor, Bob Vila).
How much does radon mitigation cost?
National average
$1,028
total project
Typical range
$400–$3,000
Most projects
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Cost by material / type
| Type | Low | High |
|---|
| Passive soil depressurization (no fan) | $500 | $2,500 |
| Active soil depressurization (sub-slab, fan-powered) | $800 | $2,500 |
| Crawl space sub-membrane depressurization | $800 | $3,000 |
| Drain tile suction | $800 | $1,700 |
| Sealed sump pump system | $800 | $2,500 |
| Block wall suction | $1,500 | $3,000 |
What affects the cost?
- System type - passive systems with no fan run $500-$2,500, while active fan-powered systems run $800-$2,500 for a standard setup, or up to $3,000 for larger, more complex homes (Bob Vila, HomeAdvisor)
- Foundation type - basement, slab-on-grade, crawl space, or block-wall construction each require a different mitigation approach and price (Angi, HomeGuide)
- Number of suction points needed - larger or more complex foundations may need multiple suction points, pushing costs toward $2,500-$3,000+ (Bob Vila, HomeAdvisor)
- Home size and architectural complexity - bigger, more complex homes cost more to fit with ductwork (Angi, HomeGuide)
- Contractor experience, certification, and local labor rates (Angi, Thumbtack)
- Radon testing, done before and often after mitigation, adds $150-$800 professionally or $12-$250 for a DIY kit (HomeAdvisor, Bob Vila)
- Permit fees typically add $25-$150 (HomeAdvisor, Bob Vila)
- Ongoing fan electricity cost of $30-$300 a year, plus fan replacement every 5-10 years at $100-$300+ (HomeAdvisor, Bob Vila)
Why does radon mitigation cost $748 to $1,529?
Most homeowners pay $748 to $1,529 for a complete radon mitigation system, with the national average landing close to $1,028 (HomeAdvisor) to $1,032 (Angi) (Thumbtack). Where a given job falls in that range comes down mostly to system type and foundation. A passive system, which vents radon using natural air pressure and has no moving parts, is the cheapest route at $500 to $2,500 (Angi, Bob Vila). An active system adds an inline fan to pull radon out more forcefully, and that pushes the price to $800-$2,500 for a standard sub-slab setup, or up to $3,000 for larger and more complex homes (Bob Vila, HomeAdvisor). Homes with block-wall foundations tend to run the highest, $1,500-$3,000 by Bob Vila’s numbers and up to $5,000 by HomeGuide’s, since block walls often require suction at multiple points rather than a single sub-slab pipe. None of these figures include radon testing, which runs $150-$800 for a professional test (HomeAdvisor, Bob Vila).
What affects the cost?
A handful of variables explain most of the spread between a $500 passive install and a $3,000+ active system:
- System type. Passive systems run $500-$2,500; active fan-powered systems run $800-$2,500, or up to $3,000 for larger, complex homes (Bob Vila, HomeAdvisor).
- Foundation type. Basements, slab-on-grade, crawl spaces, and block-wall foundations each call for a different setup and price point (Angi, HomeGuide).
- Number of suction points. Larger or split foundations sometimes need more than one suction point, which is a big reason costs climb toward $2,500-$3,000 (Bob Vila, HomeAdvisor).
- Home size and layout. More square footage and a more complex floor plan mean more ductwork to route (Angi, HomeGuide).
- Contractor experience and local labor rates, which vary by market (Angi, Thumbtack).
- Testing and permits. A professional radon test runs $150-$800, and permit fees typically add $25-$150 on top of the installed system price (HomeAdvisor, Bob Vila).
- Ongoing operating cost. The system fan draws $30-$300 a year in electricity and usually needs replacing every 5-10 years at $100-$300+ per fan (HomeAdvisor, Bob Vila).
How to lower your radon mitigation cost
- Start with a passive system if your home’s layout allows it. At $500-$2,500, passive depressurization is the cheapest option and has no fan to power or replace, though it’s less effective on homes with stubborn radon levels (Bob Vila).
- Get a proper test before you pay for mitigation. A DIY kit ($12-$250) or professional test ($150-$800) confirms whether you actually need a full system, and at what level, before you commit to a bigger job (HomeAdvisor, Bob Vila).
- Ask how many suction points your foundation actually needs. Since extra suction points are a major driver behind the $2,500-$3,000+ end of the range, get a clear answer on why a contractor is proposing more than one before you sign off (Bob Vila, HomeAdvisor).
- Budget for the fan’s operating cost, not just installation. At $30-$300 a year in electricity (HomeAdvisor, Bob Vila) plus a fan replacement every 5-10 years, factor the long-term cost into your decision, not just the upfront $748-$1,529 (Thumbtack).
- Get multiple local quotes. Reported national averages range from $978 to $1,700 depending on the source and what’s bundled in (testing versus mitigation alone), so local, itemized quotes are the most reliable way to know what you’ll actually pay.
Prices vary by region, foundation type, and contractor, so treat the figures above as a planning budget and confirm final pricing with a local quote.
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Frequently asked questions
How much does a radon mitigation system cost on average?+
Nationally, a radon mitigation system averages $978 to $1,032 installed (Bob Vila, HomeAdvisor, Angi), and most homeowners land between $748 and $1,529 for the full job (Thumbtack).
What's the cheapest type of radon mitigation system?+
Passive soil depressurization, which uses natural air pressure differences instead of a fan, is the least expensive option at $500-$2,500 (Angi, Bob Vila, HomeGuide).
How much more does an active system cost than a passive one?+
Active, fan-powered sub-slab depressurization systems typically run $800-$2,500 and can reach $3,000 on larger or more complex homes, versus $500-$2,500 for passive systems, since active systems add an inline fan and continuous electricity draw (Angi, HomeAdvisor).
Does the mitigation cost include radon testing?+
No. Professional radon testing runs $150-$800 separately, and DIY test kits cost $12-$250 (HomeAdvisor, Bob Vila).
What makes radon mitigation more expensive?+
Homes with block-wall foundations or crawl spaces tend to cost more. Block wall suction systems run $1,500-$3,000 (Bob Vila) to as much as $5,000 (HomeGuide), versus $800-$2,500 for a standard sub-slab system, because block walls often need multiple suction points.
How much does it cost to run a radon fan long-term?+
A mitigation fan adds roughly $30-$300 a year in electricity and typically needs replacing every 5-10 years at $100-$300+ per fan (HomeAdvisor, Bob Vila).
Sources
Figures synthesized and cross-checked across these sources (retrieved 2026-07-24):
- HomeAdvisor — Average cost $1,028; normal range $786-$1,274; smaller homes as little as $395; larger/complex homes up to $2,453. Active suction systems $1,000-$3,000; passive depressurization $500-$2,500. Professional radon testing $150-$800; permits $25-$150. Crawl space encapsulation $1,500-$15,000. Annual fan energy cost $30-$300; fan replacement every 5-10 years; fan power draw 100-300 watts.
- Thumbtack — Radon mitigation costs $748-$1,529 typical range, with a typical cost of approximately $1,071. Low end $438, high end $2,548.
- Bob Vila — National average $978; typical range $771-$1,185; complex/larger homes up to $3,000. By type: sub-slab active depressurization $800-$2,500; crawl space sub-membrane depressurization $800-$3,000; lower level pressurization $500-$1,000; drain tile suction $800-$1,700+; sealed sump pump hole system $800-$2,500; block suction $1,500-$3,000; passive soil suction $500-$2,500. Permit fees $25-$150; professional radon test $150-$800; DIY test kits $12-$250; radon fans $100-$300+; annual fan energy cost $30-$300.
- Angi — Average radon mitigation system costs $1,032, typically ranging $787-$1,281; minimum $400, maximum $1,795 depending on mitigation method, location, and home size.
- HomeGuide — Radon mitigation system costs $1,200-$2,000 installed on average. By type: sub-slab depressurization $800-$2,500; crawlspace active soil depressurization $1,500-$4,000; block-wall systems $2,500-$5,000; passive systems $500-$1,500. Crawl space encapsulation $3,000-$15,000 or $3-$10 per sq ft.
- Fixr — Average cost to test and mitigate radon is about $1,700 (48-hour professional alpha particle test with analysis plus passive depressurization); national average range $650-$2,850; low-end project cost $600 (passive charcoal test plus lower-level pressurization mitigation).
Aggregator national averages cluster fairly tightly: $978 (Bob Vila), $1,028 (HomeAdvisor), $1,032 (Angi), and roughly $1,071 typical (Thumbtack). This guide uses HomeAdvisor's $1,028 as the headline national average since it sits at the center of that cluster. HomeGuide cites a higher installed average of $1,200-$2,000, and Fixr's $1,700 figure bundles professional testing with mitigation rather than pricing mitigation alone, so both are treated as outliers reflecting different scope or sample mix rather than folded into the headline average. The broad $400-$3,000 range spans Angi's stated minimum ($400) through the complex/larger-home ceiling cited by Bob Vila and HomeAdvisor ($3,000). The tighter $748-$1,529 project range reflects Thumbtack's typical low-to-high spread, close to the 'normal range' both HomeAdvisor ($786-$1,274) and Angi ($787-$1,281) report. Figures cover the installed mitigation system only; they exclude radon testing ($150-$800), permits ($25-$150), and any separate crawl space encapsulation ($1,500-$15,000) or basement sealing work.