Radon Mitigation Cost in St. Louis (2026): Average Price & Estimate

Radon Mitigation Cost in St. Louis

Estimated radon mitigation cost in St. Louis

$775–$2,400

Roughly about 4% below the national average.

An affordable labor market keeps prices near or below average.

Estimate your cost

System type

Foundation

ZIP code (optional, adjusts for your area)

Based on St. Louis, MO pricing.

Estimated cost range

$775–$2,400

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An estimate for planning, not a quote. Get written quotes from local pros below.

Estimate, not a quote. Local prices vary by contractor and project. These are 2026 estimates for St. Louis, MO. Get written quotes from licensed St. Louis contractors before you budget.

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What to know about radon mitigation in St. Louis

Frost heave and freeze-thaw in St. Louis can stress foundations, so good drainage and proper footing depth matter for a lasting result.

What affects radon mitigation cost in St. Louis

Beyond the local market, the same factors that drive radon mitigation cost everywhere apply in St. Louis:

System type and number of suction points.
Foundation type: slab, basement, or crawlspace.
Fan size and routing of the vent pipe.
Sealing of cracks and openings.

Radon Mitigation cost by system type in St. Louis

These figures are adjusted for St. Louis pricing (about 0.96x the national average), so they reflect what local homeowners actually pay.

Estimated radon mitigation cost by system type in St. Louis (2026)

System type	Typical cost in St. Louis	Notes
Sub-slab suction	$775 to $2,400	The baseline.
Sump-pit system	$850 to $2,650	installed
Crawlspace membrane	$1,100 to $3,350	installed
Multiple suction points	$1,150 to $3,600	installed

Frequently asked questions

How much does radon mitigation cost in St. Louis?

In St. Louis, MO, radon mitigation typically costs $775 to $2,400 in 2026 for a standard project, about 4% below the national average. Your exact price depends on size, materials, and scope.

Why does radon mitigation cost more or less in St. Louis?

An affordable labor market keeps prices near or below average. Labor rates, permit costs, and local demand are the main reasons St. Louis prices differ from the national average.

Do I need a permit for radon mitigation in St. Louis?

Most radon mitigation projects require a permit. Requirements vary by city and Missouri jurisdiction, so confirm with your local building department. A licensed contractor usually pulls the permit for you.

When is the best time of year for radon mitigation in St. Louis?

In St. Louis, exterior work is easiest from late spring through early fall. Winter weather can delay roofing, siding, concrete, and foundation jobs, and some crews book up fast once the weather breaks.

Is radon mitigation cheaper outside St. Louis?

Sometimes. St. Louis runs about 4% below the national average. Nearby smaller towns with lower labor costs can come in cheaper, while denser urban areas often cost more. Always compare quotes from contractors who serve your specific area.