2026 Radon Mitigation System Cost Calculator
Estimate turnkey installation costs for Active Sub-Slab Depressurization (ASD) and Crawlspace Sub-Membrane (SMD) radon systems. Powered by state-level EPA Radon Zone data (pCi/L), NRPP labor rates, and 24/7 continuous fan electricity calculations.
Radon Mitigation System & Vapor Barrier Cost Calculator
Active soil depressurization (ASD) maintains negative pressure (-0.2" to -1.8" WC on the U-tube manometer) beneath the slab to exhaust soil gas above the roofline before entry.
2026 Radon Mitigation Cost by Foundation & System Type
National average turnkey quotes from NRPP/NRSB certified radon mitigators, including core drilling, Schedule 40 PVC stack, inline fan, U-tube manometer, and post-mitigation continuous radon monitor (CRM) verification.
| Mitigation System Type | 2026 Installed Range | Typical Fan Model | Expected Reduction |
|---|---|---|---|
| Sub-Slab ASD (Post-2000 Gravel Base) | $1,150 – $1,650 | RP145 / Maverick (45–60W) | 85% – 96% (<1.5 pCi/L) |
| Sub-Slab ASD (Pre-1985 Tight Clay / 2 Drops) | $1,600 – $2,350 | GP501 / Eagle Extreme (95W) | 80% – 92% (<2.0 pCi/L) |
| Sump Pit & Drain-Tile Depressurization | $1,350 – $1,950 | RP145 + Sealed Lexan Dome | 90% – 98% (<1.2 pCi/L) |
| Dirt Crawlspace SMD (12-Mil Vapor Barrier) | $2,200 – $3,900 | RP145 + Perforated Collector | 85% – 95% (<1.8 pCi/L) |
| Passive New-Construction Stub Activation | $650 – $980 | Attic Fan Cut-In Only | 85% – 95% (<1.5 pCi/L) |
Frequently Asked Questions About Radon Mitigation
How much does a radon mitigation system cost in 2026?
In 2026, a standard active sub-slab depressurization (ASD) radon mitigation system costs between $1,150 and $1,650 installed for homes with a permeable gravel base. Older homes with tight clay soil requiring two suction points cost $1,600 to $2,350, while dirt crawlspace sub-membrane depressurization (SMD) systems with a 12-mil reinforced vapor barrier range from $2,200 to $3,900.
At what radon level does the EPA recommend mitigation?
The U.S. Environmental Protection Agency (EPA) sets the federal action level at 4.0 picocuries per liter (pCi/L) of air, and recommends considering mitigation for levels between 2.0 and 3.9 pCi/L. The World Health Organization (WHO) recommends a reference action level of 2.7 pCi/L (100 Bq/m³).
How much electricity does a radon fan use per year?
A standard inline radon fan (such as a RadonAway RP145 or Festa AMG Maverick) draws 45 to 65 watts continuously (~480 kWh per year), costing $65 to $95 per year at average U.S. electricity rates. High-suction fans for tight clay soil draw 85 to 125 watts, costing $120 to $190 per year.
Should the radon exhaust pipe run on the exterior wall or through the garage attic?
An exterior sidewall PVC run is $250 to $500 cheaper and avoids cutting into interior drywall or roof decking, though the PVC pipe and fan housing remain visible on the side of the home. Routing the pipe up through an attached garage and penetrating the garage roof hides the fan in the attic and improves curb appeal.
How long does a radon mitigation fan last?
Continuous-duty residential radon fans carry a 5-year manufacturer warranty and typically last 8 to 12 years running 24/7/365. Replacing a burned-out radon fan unit inside an existing PVC stack costs $320 to $490 including labor.